MAXIM MAX2828, MAX2829 User Manual

General Description

The MAX2828/MAX2829 single-chip, RF transceiver ICs are designed specifically for OFDM 802.11 WLAN applications. The MAX2828 is designed for single-band

802.11a applications covering world-band frequencies of 4.9GHz to 5.875GHz. The MAX2829 is designed for dual-band 802.11a/g applications covering world-bands of 2.4GHz to 2.5GHz and 4.9GHz to 5.875GHz. The ICs include all circuitry required to implement the RF transceiver function, providing a fully integrated receive path, transmit path, VCO, frequency synthesizer, and baseband/control interface. Only the PA, RF switches, RF bandpass filters (BPF), RF baluns, and a small number of passive components are needed to form the complete RF front-end solution.

Each IC completely eliminates the need for external SAW filters by implementing on-chip monolithic filters for both the receiver and transmitter. The baseband filtering and the Rx/Tx signal paths are optimized to meet the

802.11a/g IEEE standards and cover the full range of the required data rates (6, 9, 12, 18, 24, 36, 48, and 54Mbps for OFDM; 1, 2, 5.5, and 11Mbps for CCK/DSSS), at receiver sensitivity levels up to 10dB better than 802.11a/g standards. The MAX2828/MAX2829 transceivers are available in the small 56-pin, exposed paddle thin QFN package.

Applications

Single-/Dual-Band 802.11a/b/g Radios

4.9GHz Public Safety Radios

2.4GHz/5GHz MIMO and Smart Antenna Systems

Features

♦ World-Band Operation

MAX2828: 4.9GHz to 5.875GHz (802.11a) MAX2829: 2.4GHz to 2.5GHz and 4.9GHz to

5.875GHz (802.11a/b/g)

♦ Best-In-Class Transceiver Performance

-75dBm Rx Sensitivity at 54Mbps (802.11g)

-46dB (802.11g)/-51dB (802.11a) Tx Sideband Suppression

1.5% (802.11g) and 2% (802.11a) Tx EVM

-100dBc/Hz (802.11g)/-95dBc/Hz (802.11a) LO Phase Noise

Programmable Baseband Lowpass Filters Integrated PLL with 3-Wire Serial Interface 93dB (802.11g)/97dB (802.11a) Receiver Gain-

Control Range

200ns Rx I/Q DC Settling 60dB Dynamic Range Rx RSSI 30dB Tx Power-Control Range Tx/Rx I/Q Error Detection I/Q Analog Baseband Interface for Tx and Rx

Digital Mode Selection (Tx, Rx, Standby, and Power Down)

Supports Both Serial and Parallel Gain Control

♦ MIMO and Smart Antenna Compatibility

Coherent LO Phase Among Multiple

Transceivers

♦ Support 40MHz Channel Bandwidth (Turbo Mode) ♦ Single +2.7V to +3.6V Supply ♦ 1µA Low-Power Shutdown Mode ♦ Small 56-Pin TQFN Package (8mm x 8mm)

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

N.C.

GND

RXRFH

GND

TXRFH+

GND

VCCV

TXRFH-

TXENA

PABIAS

VCCV

TXBBI+

TXBBI-

TXBBQ+

TXBBQ-

BIAS

REF

GND

DIN

SCLK

RXENA

RXHP

RSSI

BYPASS

GND

CPOUT

GND

ROSC

RXBBI+

RXBBI-

RXBBQ+

RXBBQ-

15 16 17 18 19 201421 22 23 24 25 26 27 28

55 54 53 52 51 50 49 48 47 46 45 44 4356

TUNE

MAX2828

SHDN

Pin Configurations

Ordering Information

19-3455; Rev 0; 10/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

*EP = Exposed paddle.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX2828 ETN

56 TQFN-EP* (T5688-2)

MAX2829 ETN

56 TQFN-EP* (T5688-2)

Pin Configurations continued at end of data sheet.

-40°C to +85°C

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

VCC, TXRFH_, TXRFL_ to GND..............................-0.3V to +4.2V

RXRFH, RXRFL, TXBBI_, TXBBQ_, ROSC, RXBBI_, RXBBQ_,

RSSI, PABIAS, V

REF

, CPOUT, RXENA, TXENA, SHDN, CS,

SCLK, DIN, B_, RXHP, LD, R

BIAS

BYPASS to GND....................................-0.3V to (V

+ 0.3V)

RXBBI_, RXBBQ_, RSSI, PABIAS, V

REF

, CPOUT,

LD Short-Circuit Duration...................................................10s

RF Input Power ...............................................................+10dBm

Continuous Power Dissipation (T

= +70°C)

56-Pin Thin QFN (derate 31.3mW/°C above +70°C)....2500mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10s) .................................+300°C

DC ELECTRICAL CHARACTERISTICS

(MAX2828/MAX2829 evaluation kits: VCC= 2.7V to 3.6V, Rx/Tx set to maximum gain, R

BIAS

= 11kΩ, no signal at RF inputs, all RF inputs and outputs terminated into 50Ω, receiver baseband outputs are open, no signal applied to Tx I/Q BB inputs in Tx mode, f

REFOSC

= 40MHz, registers set to default settings and corresponding test mode, TA= -40°C to +85°C, unless otherwise noted.

Typical values are at V

= +2.7V and TA= +25°C, unless otherwise noted.) (Note 1)

PARAMETERS CONDITIONS

UNITS

Supply Voltage 2.7 3.6 V

1 100 µA

TA = +25°C3747

802.11g MAX2829 51

TA = +25°C4451

Standby mode

802.11a 55

TA = +25°C

151

802.11g MAX2829

158

TA = +25°C

180

Rx mode

802.11a

188

TA = +25°C

164

802.11g MAX2829

175

TA = +25°C

184

Tx mode

802.11a

197

802.11g MAX2829 TA = +25°C65

Standby mode (MIMO) (Note 2)

802.11a

TA = +25°C70

802.11g MAX2829 TA = +25°C

Rx mode (MIMO) (Note 2)

802.11a

TA = +25°C

802.11g MAX2829 TA = +25°C

Tx mode (MIMO) (Note 2)

802.11a

TA = +25°C

802.11g MAX2829

Tx calibration mode, T

= +25°C

802.11g MAX2829

Supply Current

RX calibration mode, TA = +25°C

Rx I/Q Output Common-Mode Voltage

= +25°C

0.9

CAUTION! ESD SENSITIVE DEVICE

Shutdown mode, reference oscillator not applied, VIL = 0

TA = -40°C to +85°C

MAX2828/MAX2829

802.11a MAX2828/MAX2829 147

802.11a MAX2828/MAX2829 210

TA = -40°C to +85°C

= -40°C to +85°C

MIN TYP MAX

118

0.80

135

124

142

136

154

139

157

129

188

1.05

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS—802.11g Rx Mode (MAX2829)

(MAX2829 evaluation kit: VCC= +2.7V, fIN= 2.437GHz; receiver baseband I/Q outputs at 112mV

RMS

(-19dBV), f

REFOSC

= 40MHz,

SHDN = RXENA = CS = high, RXHP = TXENA = SCLK = DIN = low, R

BIAS

= 11kΩ, registers set to default settings and correspond-

ing test mode, T

= +25°C, unless otherwise noted. Unmodulated single-tone RF input signal is used, unless otherwise indicated.)

(Tables 1, 2, 3)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

RECEIVER SECTION: LNA RF INPUT TO BASEBAND I/Q OUTPUTS

RF Input Frequency Range

GHz

-22

LNA medium-gain mode (B7:B6 = 10)

-24

RF Input Return Loss

With 50Ω external match

-12

TA = +25°C8794

Maximum gain, B7:B1 = 1111111

= -40°C to +85°C (Note 1) 85

Total Voltage Gain

Minimum gain, B7:B1 = 0000000

= +25°C1

From high-gain mode (B7:B6 = 11) to medium-gain mode (B7:B6 = 10) (Note 3)

-15.5

RF Gain Steps

From high-gain mode (B7:B6 = 11) to low-gain mode (B7:B6 = 0X) (Note 3)

-30.5

Gain Variation Over RF Band fRF = 2.412GHz to 2.5GHz 3 dB

Baseband Gain Range

From maximum baseband gain (B5:B1 = 11111) to minimum baseband gain (B5:B1 = 00000)

62 dB

DC ELECTRICAL CHARACTERISTICS (continued)

(MAX2828/MAX2829 evaluation kits: VCC= 2.7V to 3.6V, Rx/Tx set to maximum gain, R

BIAS

= 11kΩ, no signal at RF inputs, all RF inputs and outputs terminated into 50Ω, receiver baseband outputs are open, no signal applied to Tx I/Q BB inputs in Tx mode, f

REFOSC

= 40MHz, registers set to default settings and corresponding test mode, TA= -40°C to +85°C, unless otherwise noted.

Typical values are at V

= +2.7V and TA= +25°C, unless otherwise noted.) (Note 1)

PARAMETERS CONDITIONS

MIN

TYP

MAX

UNITS

TA = -40°C (relative to +25°C) -25

Rx I/Q Output Common-Mode Voltage Variation

= +85°C (relative to +25°C) 20

Tx Baseband Input CommonMode Voltage Operating Range

0.9 1.3 V

Tx Baseband Input Bias Current 13 µA

Reference Voltage Output -1mA < I

OUT

< +1mA 1.2 V

Digital Input-Voltage High, V

VCC -

0.4

Digital Input-Voltage Low, V

0.4 V

Digital Input-Current High, I

-1 +1 µA

Digital Input-Current Low, I

-1 +1 µA

LD Output-Voltage High, V

Sourcing 100µA

0.4

LD Output-Voltage Low, V

Sinking 100µA 0.4 V

2.412 2.500

LNA high-gain mode (B7:B6 = 11)

LNA low-gain mode (B7:B6 = 0X)

5.5

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—802.11g Rx Mode (MAX2829) (continued)

(MAX2829 evaluation kit: VCC= +2.7V, fIN= 2.437GHz; receiver baseband I/Q outputs at 112mV

RMS

(-19dBV), f

REFOSC

= 40MHz,

SHDN = RXENA = CS = high, RXHP = TXENA = SCLK = DIN = low, R

BIAS

= 11kΩ, registers set to default settings and correspond-

ing test mode, T

= +25°C, unless otherwise noted. Unmodulated single-tone RF input signal is used, unless otherwise indicated.)

(Tables 1, 2, 3)

PARAMETER CONDITIONS

TYP

UNITS

Voltage gain ≥ 65dB, with B7:B6 = 11 3.5

Voltage gain = 50dB, with B7:B6 = 11 4

Voltage gain = 45dB, with B7:B6 = 10 16

DSB Noise Figure

Voltage gain = 15dB, with B7:B6 = 0X 36

Output P-1

Voltage gain = 90dB, with B7:B6 = 11 3.2

P-P

Voltage gain = 60dB, with B7:B6 = 11

-10

Voltage gain = 45dB, with B7:B6 = 10

-2

Out-of-Band Input IP3

-35dBm jammers at 40MHz and 78MHz offset; based on IM3 at 2MHz

Voltage gain = 40dB, with B7:B6 = 0X

dBm

Voltage gain = 40dB, with B7:B6 = 11 -29

Voltage gain = 25dB, with B7:B6 = 10 -14In-Band Input P-1

Voltage gain = 5dB, with B7:B6 = 0X 2

dBm

Voltage gain = 40dB, with B7:B6 = 11

-17

Voltage gain = 25dB, with B7:B6 = 10

-5

In-Band Input IP3

Tones at 7MHz and 8MHz, IM3 at 6MHz and 9MHz, P

-40dBm per tone Voltage gain = 5dB,

with B7:B6 = 0X

dBm

I/Q Phase Error B7:B1 = 1101110, 1σ variation ±0.5

degrees

I/Q Gain Imbalance B7:B1 = 1101110, 1σ variation ±0.1 dB

Tx-to-Rx Conversion Gain for Rx I/Q Calibration

B7:B1 = 0010101 (Note 4) -4 dB

I/Q Static DC Offset RXHP = 1, B7:B1 = 1101110, 1σ variation ±2mV

I/Q DC Droop

After switching RXHP to 0, D2 = 0 (see the RX Control/RSSI Register Definition section)

±1

mV/ms

RF Gain-Change Settling Time

Gain change from high gain to medium gain, high gain to low gain, or medium gain to low gain; gain settling to within ±2dB of steady state

0.4 µs

Baseband VGA Settling Time

Gain change from B5:B1 = 10111 to B5:B1 = 00111; gain settling to within ±2dB of steady state

0.1 µs

Minimum differential resistance 10 kΩ

Rx I/Q Output Load Impedance

Maximum differential capacitance 8 pF

Spurious Signal Emissions at LNA Input

RF = 1GHz to 26.5GHz -67

dBm

MIN

MAX

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

_______________________________________________________________________________________ 5

AC ELECTRICAL CHARACTERISTICS—802.11g Rx Mode (MAX2829) (continued)

(MAX2829 evaluation kit: VCC= +2.7V, fIN= 2.437GHz; receiver baseband I/Q outputs at 112mV

RMS

(-19dBV), f

REFOSC

= 40MHz,

SHDN = RXENA = CS = high, RXHP = TXENA = SCLK = DIN = low, R

BIAS

= 11kΩ, registers set to default settings and correspond-

ing test mode, T

= +25°C, unless otherwise noted. Unmodulated single-tone RF input signal is used, unless otherwise indicated.)

(Tables 1, 2, 3)

PARAMETER CONDITIONS

TYP

UNITS

RECEIVER BASEBAND FILTERS

Narrowband mode 7.5

Nominal mode 9.5

Turbo mode 1 14

Baseband -3dB Corner Frequency

(See the Lowpass

Filter Register

section)

Turbo mode 2 18

MHz

BASEBAND

= 15MHz 20

BASEBAND

= 20MHz 39

Baseband Filter Rejection (Nominal Mode)

BASEBAND

> 40MHz 84

RSSI

RXHP = 1, low range (D11 = 0, see the Rx Control/RSSI Register Definition section)

0.5

RSSI Minimum Output Voltage

RXHP = 1, high range (D11 = 1, see the Rx Control/RSSI Register Definition section)

0.52

RXHP = 1, low range (D11 = 0, see the Rx Control/RSSI Register Definition section)

RSSI Maximum Output Voltage

RXHP = 1, high range (D11 = 1, see the Rx Control/RSSI Register Definition section)

2.5

RXHP = 1, low range (D11 = 0, see the Rx Control/RSSI Register Definition section)

22.5

RSSI Slope

RXHP = 1, high range (D11 = 1, see the Rx Control/RSSI Register Definition section)

mV/dB

+40dB signal step 0.2

RSSI Output Settling Time

To within 3dB of steady state

-40dB signal step 0.7

µs

MIN

MAX

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

6 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—802.11a Rx Mode (MAX2828/MAX2829)

(MAX2828/MAX2829 evaluation kits: VCC= +2.7V, fIN= 5.25GHz; receiver baseband I/Q outputs at 112mV

RMS

(-19dBV), f

REFOSC

40MHz, SHDN = RXENA = CS = high, RXHP = TXENA = SCLK = DIN = low, R

BIAS

= 11kΩ, registers set to default settings and cor-

responding test mode, T

= +25°C, unless otherwise noted. Unmodulated single-tone RF input signal is used, unless otherwise indi-

cated.) (Tables 1, 2, 3)

PARAMETER CONDITIONS

TYP

UNITS

RECEIVER SECTION: LNA RF INPUT TO BASEBAND I/Q OUTPUTS

802.11a low-band mode

RF Input Frequency Range

802.11a high-band mode

GHz

-15

LNA medium-gain mode (B7:B6 = 10)

-11

RF Input Return Loss

With 50Ω external match

-7

TA = +25°C9197

Maximum gain, B7:B1 = 1111111

= -40°C to +85°C (Note 1) 88

Total Voltage Gain

Minimum gain, B7:B1 = 0000000

= +25°C03

From high-gain mode (B7:B6 = 11) to medium-gain mode (B7:B6 = 10) (Note 3)

-19

RF Gain Steps

From high-gain mode (B7:B6 = 11) to low-gain mode (B7:B6 = 0X) (Note 3)

-34.5

fRF = 4.9GHz -0.3

fRF = 5.35GHz 0.4

Gain Variation Relative to

5.25GHz f

= 5.875GHz -4

Baseband Gain Range

From maximum baseband gain (B5:B1 = 11111) to minimum baseband gain (B5:B1 = 00000)

62 dB

Voltage gain ≥ 65dB, with B7:B6 = 11 4.5

Voltage gain = 50dB, with B7:B6 = 11 4.8

Voltage gain = 45dB, with B7:B6 = 10 15

DSB Noise Figure

Voltage gain = 15dB, with B7:B6 = 0X 36

Output P-1

Voltage gain = 90dB, with B7:B6 = 11 3.2

P-P

Voltage gain = 60dB, with B7:B6 = 11

-15

Voltage gain = 45dB, with B7:B6 = 10

0.5

Out-of-Band Input IP3

-35dBm jammers at 40MHz and 78MHz offset; based on IM3 at 2MHz

Voltage gain = 40dB, with B7:B6 = 0X

dBm

Voltage gain = 35dB, with B7:B6 = 11 -32

Voltage gain = 20dB, with B7:B6 = 10 -12In-Band Input P-1

Voltage gain = 5dB, with B7:B6 = 0X 3

dBm

LNA high-gain mode (B7:B6 = 11)

LNA low-gain mode (B7:B6 = 0X)

MIN

4.900 5.350

5.470 5.875

MAX

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

_______________________________________________________________________________________ 7

AC ELECTRICAL CHARACTERISTICS—802.11a Rx Mode (MAX2828/MAX2829) (continued)

(MAX2828/MAX2829 evaluation kits: VCC= +2.7V, fIN= 5.25GHz; receiver baseband I/Q outputs at 112mV

RMS

(-19dBV), f

REFOSC

40MHz, SHDN = RXENA = CS = high, RXHP = TXENA = SCLK = DIN = low, R

BIAS

= 11kΩ, registers set to default settings and cor-

responding test mode, T

= +25°C, unless otherwise noted. Unmodulated single-tone RF input signal is used, unless otherwise indi-

cated.) (Tables 1, 2, 3)

PARAMETER CONDITIONS

TYP

UNITS

Voltage gain = 35dB, with B7:B6 = 11

-24

Voltage gain = 20dB, with B7:B6 = 10

-5

In-Band Input IP3

Tones at 7MHz and 8MHz, IM3 at 6MHz and 9MHz, P

-40dBm per tone

Voltage gain = 5dB, with B7:B6 = 0X

dBm

I/Q Phase Error B7:B1 = 1101110, 1σ variation ±0.4

degrees

I/Q Gain Imbalance B7:B1 = 1101110, 1σ variation ±0.1 dB

Tx-to-Rx Conversion Gain for Rx I/Q Calibration

B7:B1 = 0001111 (Note 4) 0 dB

I/Q Static DC Offset RXHP = 1, B7:B1 = 1101110, 1σ variation ±2mV

I/Q DC Droop

After switching RXHP to 0, D2 = 0 (see the Rx Control/RSSI Register Definition section)

±1

mV/ms

RF Gain-Change Settling Time

Gain change from high gain to medium gain, high gain to low gain, or medium gain to low gain; gain settling to within ±2dB of steady state

0.4 µs

Baseband VGA Settling Time

Gain change from B5:B1 = 10111 to B5:B1 = 00111; gain settling to within ±2dB of steady state

0.1 µs

Minimum differential resistance 10 kΩ

Rx I/Q Output Load Impedance

Maximum differential capacitance 8 pF

Spurious Signal Emissions at LNA input

RF = 1GHz to 26.5GHz -50

dBm

RECEIVER BASEBAND FILTERS

Narrow-band mode 7.5

Nominal mode 9.5

Turbo mode 1 14

Baseband -3dB Corner Frequency

(See the Lowpass

Filter Register Definition section)

Turbo mode 2 18

MHz

BASEBAND

= 15MHz 20

BASEBAND

= 20MHz 39

Baseband Filter Rejection (Nominal Mode)

BASEBAND

> 40MHz 80

MIN

MAX

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

8 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—802.11a Rx Mode (MAX2828/MAX2829) (continued)

(MAX2828/MAX2829 evaluation kits: VCC= +2.7V, fIN= 5.25GHz; receiver baseband I/Q outputs at 112mV

RMS

(-19dBV), f

REFOSC

40MHz, SHDN = RXENA = CS = high, RXHP = TXENA = SCLK = DIN = low, R

BIAS

= 11kΩ, registers set to default settings and cor-

responding test mode, T

= +25°C, unless otherwise noted. Unmodulated single-tone RF input signal is used, unless otherwise indi-

cated.) (Tables 1, 2, 3)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

RSSI

RXHP = 1, low range (D11 = 0, see the Rx Control/RSSI Register Definition section)

0.5

RSSI Minimum Output Voltage

RXHP = 1, high range (D11 = 1, see the Rx Control/RSSI Register Definition section)

0.52

RXHP = 1, low range (D11 = 0, see the Rx Control/RSSI Register Definition section)

RSSI Maximum Output Voltage

RXHP = 1, high range (D11 = 1, see the Rx Control/RSSI Register Definition section)

2.5

RXHP = 1, low range (D11 = 0, see the Rx Control/RSSI Register Definition section)

22.5

RSSI Slope

RXHP = 1, high range (D11 = 1, see the Rx Control/RSSI Register Definition section)

mV/dB

+40dB signal step 0.2

RSSI Output Settling Time

To within 3dB of steady state

-40dB signal step 0.7

µs

AC ELECTRICAL CHARACTERISTICS—802.11g Tx Mode (MAX2829)

(MAX2829 evaluation kit: VCC= +2.7V, f

OUT

= 2.437GHz, f

REFOSC

= 40MHz, SHDN = TXENA = CS = high, RXENA = SCLK = DIN =

low, R

BIAS

= 11kΩ, 100mV

RMS

sine and cosine signal (or 100mV

RMS

, 54Mbps IEEE 802.11g I/Q signals wherever OFDM is men-

tioned) applied to baseband I/Q inputs of transmitter, registers set to default settings and corresponding test mode, T

= +25°C,

unless otherwise noted.) (Table 4)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

TRANSMIT SECTION: Tx BASEBAND I/Q INPUTS TO RF OUTPUTS

RF Output Frequency Range, f

GHz

1.5% EVM

Output Power

54Mbps 802.11g OFDM signal

B6:B1 = 111011

dBm

Output Power (CW)

= 100mV

RMS

at 1MHz I/Q CW signal, B6:B1 =

111111

-2

dBm

Output Power Range B6:B1 = 111111 to B6:B1 = 000000 30 dB

Carrier Leakage Without DC offset cancellation

dBc

Unwanted Sideband Suppression

Uncalibrated

dBc

Tx Output ACP

Measured with 1MHz resolution bandwidth at 22MHz offset from channel center (B6:B1 = 111011), OFDM signal

dBm/

MHz

RF Output Return Loss With external 50Ω match

2.412 2.500

-2.5

-4.5

-27

-46

-69

-14

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

_______________________________________________________________________________________ 9

AC ELECTRICAL CHARACTERISTICS—802.11g Tx Mode (MAX2829) (continued)

(MAX2829 evaluation kit: VCC= +2.7V, f

OUT

= 2.437GHz, f

REFOSC

= 40MHz, SHDN = TXENA = CS = high, RXENA = SCLK = DIN =

low, R

BIAS

= 11kΩ, 100mV

RMS

sine and cosine signal (or 100mV

RMS

, 54Mbps IEEE 802.11g I/Q signals wherever OFDM is men-

tioned) applied to baseband I/Q inputs of transmitter, registers set to default settings and corresponding test mode, T

= +25°C,

unless otherwise noted.) (Table 4)

PARAMETER CONDITIONS

UNITS

2/3 x f

4/3 x f

5/3 x f

RF Spurious Signal Emissions

B6:B1 = 111011, OFDM signal

8/3 x f

dBm/

MHz

Nominal mode 12

Turbo mode 1 18

Baseband -3dB Corner Frequency

(See the Lowpass Filter

section)

Turbo mode 2 24

MHz

Baseband Filter Rejection

At 30MHz, in nominal mode (see the Lowpass Filter Register Definition section)

60 dB

Minimum differential resistance 60 kΩ

Tx Baseband Input Impedance

Maximum differential capacitance 0.7 pF

TRANSMITTER LO LEAKAGE AND I/Q CALIBRATION USING LO LEAKAGE AND SIDEBAND DETECTOR (SEE THE Tx/Rx CALIBRATION MODE SECTION) Tx BASEBAND I/Q INPUTS TO RECEIVER OUTPUTS

Output at 1 x f

TONE

(for LO leakage

= -29dBc), f

TONE

= 2MHz,

100mV

RMS

-3

LO Leakage and SidebandDetector Output

Calibration register, D12:D11 = 11, A3:A0 = 0110

Output at 2 x f

TONE

(for sideband

suppression = -40dBc), f

TONE

2MHz, 100mV

RMS

-13

dBV

RMS

Amplifier Gain Range D12:D11 = 00 to D12:D11 = 11, A3:A0 = 0110 26 dB

Lower -3dB Corner Frequency

MHz

MIN TYP MAX

-64

-61

-63

-52

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

10 ______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—802.11a Tx Mode (MAX2828/MAX2829)

(MAX2828/MAX2829 evaluation kits: VCC= +2.7V, f

OUT

= 5.25GHz, f

REFOSC

= 40MHz, SHDN = TXENA = CS = high, RXENA = SCLK

= DIN = low, R

BIAS

= 11kΩ, 100mV

RMS

sine and cosine signal (or 100mV

RMS

, 54Mbps IEEE 802.11a I/Q signals wherever OFDM is

mentioned) applied to baseband I/Q inputs of transmitter, registers set to default settings and corresponding test mode, T

= +25°C,

unless otherwise noted.) (Table 4)

PARAMETER CONDITIONS

TYP

UNITS

TRANSMIT SECTION: Tx BASEBAND I/Q INPUTS TO RF OUTPUTS

802.11a low-band mode

RF Output Frequency Range, f

802.11a high-band mode

GHz

2% EVM -5

Output Power

54Mbps 802.11a OFDM signal

B6:B1 = 111100 -6.5

dBm

Output Power (CW)

= 100mV

RMS

at 1MHz I/Q CW signal, B6:B1 =

111111

-4.5

dBm

fRF = 4.9GHz -6

fRF = 5.35GHz -0.5

Output Power Variation Relative to 5.25GHz

= 5.875GHz -1

Output Power Range B6:B1 = 111111 to B6:B1 = 000000 30 dB

Carrier Leakage Without DC offset cancellation -27

dBc

Unwanted Sideband Suppression

Uncalibrated -51 dBc

Tx Output ACP

Measured with 1MHz resolution bandwidth at 30MHz offset from channel center (B6:B1 = 111100), OFDM signal

-80

dBm/

MHz

RF Output Return Loss With external 50Ω match -16 dB

4/5 x f

-55

6/5 x f

-64

7/5 x f

-65

RF Spurious Signal Emissions

B6:B1 = 111100, OFDM signal

8/5 x f

-49

dBm/

MHz

Nominal mode 12

Turbo mode 1 18

Baseband -3dB Corner Frequency

(see the Lowpass

Filter Register Definition section)

Turbo mode 2 24

MHz

Baseband Filter Rejection

At 30MHz, in nominal mode (see the Lowpass Filter Register Definition section)

60 dB

Minimum differential resistance 60 kΩ

Tx Baseband Input Impedance

Maximum differential capacitance 0.7 pF

TRANSMITTER LO LEAKAGE AND I/Q CALIBRATION USING LO LEAKAGE AND SIDEBAND DETECTOR (SEE THE Tx/Rx CALIBRATION MODE SECTION)

Tx BASEBAND I/Q INPUTS TO RECEIVER OUTPUTS

Output at 1 x f

TONE

(for LO

leakage = -29dBc), f

TONE

2MHz, 100mV

RMS

-4.5

LO Leakage and SidebandDetector Output

Calibration register, D12:D11 = 1, A3:A0 = 0110

Output at 2 x f

TONE

(for sideband

suppression = -40dBc), f

TONE

2MHz, 100mV

RMS

-14.5

dBV

RMS

Amplifier Gain Range D12:D11 = 00 to D12:D11 = 11, A3:A0 = 0110 26 dB

Lower -3dB Corner Frequency 1

MHz

MIN

4.900 5.350

5.470 5.875

MAX

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 11

AC ELECTRICAL CHARACTERISTICS—Frequency Synthesis

(MAX2828/MAX2829 evaluation kits: VCC= +2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN =

CS = high, SCLK = DIN = low, PLL loop bandwidth = 150kHz, R

BIAS

= 11kΩ, TA= +25°C, unless otherwise noted.)

PARAMETER CONDITIONS

UNITS

FREQUENCY SYNTHESIZER

802.11g mode

802.11a low-band mode

RF Channel Center Frequency

802.11a high-band mode

MHz

Charge-Pump Comparison Frequency

MHz

REFOSC

Input Frequency 20 44

MHz

Reference-Divider Ratio 14

REFOSC

Input Levels AC-coupled

P-P

REFOSC

Input Impedance 10 kΩ

OFFSET

= 1kHz -87

OFFSET

= 10kHz

OFFSET

= 100kHz -99

OFFSET

= 1MHz

802.11g

OFFSET

= 10MHz

OFFSET

= 1kHz -84

OFFSET

= 10kHz -95

OFFSET

= 100kHz -92

OFFSET

= 1MHz

Closed-Loop Phase Noise

802.11a

OFFSET

= 10MHz

dBc/Hz

802.11g 0.6

Closed-Loop Integrated Phase Noise

RMS phase jitter, integrate from 10kHz to 10MHz offset

802.11a 1

d eg r ees

Charge-Pump Output Current 4mA

Charge-Pump Output Voltage >70% of I

0.5

802.11g -65

Reference Spurs 20MHz offset

802.11a -58

dBc

VOLTAGE-CONTROLLED OSCILLATOR

VCO Tuning Voltage Range 0.4 2.3 V

TUNE

= 0.4V

802.11g V

TUNE

= 2.3V 62

TUNE

= 0.3V

TUNE

= 2.2V

TUNE

= 0.3V

LO Tuning Gain

TUNE

= 2.2V

MHz/V

802.11a

Low band

High band

MIN TYP MAX

2412 2500

4900 5350

5470 5875

800

-103

-112

-125

-108

-124

VCC - 0.5V

135

324

167

330

175

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

12 ______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—Miscellaneous Blocks

(MAX2828/MAX2829 evaluation kits: VCC= +2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN =

CS = high, SCLK = DIN = low, R

BIAS

= 11kΩ, TA= +25°C, unless otherwise noted.)

PARAMETER CONDITIONS

UNITS

PA BIAS DAC

Number of Programmable Bits 6 Bits

Minimum Output Sink Current

D5:D0 = 000000 (see the PA Bias DAC Register Definition section)

0µA

Maximum Output Sink Current

D5:D0 = 111111 (see the PA Bias DAC Register Definition section), output voltage = 0.8V

313 µA

Turn-On Time

D9:D6 = 0000 (see the PA Bias DAC Register Definition section)

0.2 µs

DNL 1 LSB

ON-CHIP TEMPERATURE SENSOR

TA = -40°C 0.5

TA = +25°C

Output Voltage

D11 = 1 (see the Rx

Control/RSSI Register Definition

section)

= +85°C 1.6

AC ELECTRICAL CHARACTERISTICS—Timing

(MAX2828/MAX2829 evaluation kits: VCC= 2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN =

CS = high, SCLK = DIN = low, PLL loop bandwidth = 150kHz, R

BIAS

= 11kΩ, TA= +25°C, unless otherwise noted.)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

SYSTEM TIMING (See Figure 1)

Turn-On Time From SHDN rising edge (PLL locked) 50 µs

Shutdown Time 2µs

fRF = 2.412GHz to 2.5GHz 25

fRF = 5.15GHz to 5.35GHz 35

fRF = 5.45GHz to 5.875GHz

Channel Switching Time

= 4.9GHz to 5.875GHz

µs

Rx to Tx 1

Rx/Tx Turnaround Time

Measured from Tx or Rx enable rising edge; signal settling to within ±2dB of steady state

Tx to Rx, RXHP = 1

µs

Tx Turn-On Time (From Standby Mode)

From Tx enable rising edge; signal settling to within ±2dB of steady state

1µs

Rx Turn-On Time (From Standby Mode)

From Rx enable rising edge; signal settling to within ±2dB of steady state

µs

MIN TYP MAX

1.05

130

1.2

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 13

AC ELECTRICAL CHARACTERISTICS—Timing (continued)

(MAX2828/MAX2829 evaluation kits: VCC= 2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN =

CS = high, SCLK = DIN = low, PLL loop bandwidth = 150kHz, R

BIAS

= 11kΩ, TA= +25°C, unless otherwise noted.)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

3-WIRE SERIAL INTERFACE TIMING (SEE FIGURE 2)

SCLK-Rising-Edge to CS-FallingEdge Wait Time, t

CSO

6ns

Falling Edge of CS to Rising Edge of First SCLK Time, t

CSS

6ns

DIN-to-SCLK Setup Time, t

6ns

DIN-to-SCLK Hold Time, t

6ns

SCLK Pulse-Width High, t

6ns

SCLK Pulse-Width Low, t

6ns

Last Rising Edge of SCLK to Rising Edge of CS or Clock to Load Enable Setup Time, t

CSH

6ns

CS High Pulse Width, t

CSW

20 ns

Time Between the Rising Edge of CS and the Next Rising Edge of SCLK, t

CS1

6ns

Clock Frequency, f

CLK

40 MHz

Rise Time, t

2ns

Fall Time, t

2ns

Note 1: Devices are production tested at +85°C only. Min and max limits at temperatures other than +85°C are guaranteed by

design and characterization.

Note 2: Register settings for MIMO mode. A3:A0 = 0101 and A3:A0 = 0010, D13 = 1. Note 3: The expected part-to-part variation of the RF gain step is

±1dB.

Note 4: Tx I/Q inputs = 100mV

RMS

. Set Tx VGA gain to max.

Table 1. Receiver Front-End Gain-Control Settings

B7 B6 GAIN

1 1 High

1 0 Medium

0 X Low

Table 2. Receiver Baseband VGA Gain Settings

B5:B1 GAIN

11111 Max

11110 Max - 2dB

11101 Max - 4dB

00000 Min

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

14 ______________________________________________________________________________________

Table 3. Receiver Baseband VGA Gain Step Control

BIT GAIN STEP (typ)

B1 2dB

B2 4dB

B3 8dB

B4 16dB

B5 32dB

Table 4. Tx VGA Gain Control Settings

NUMBER B6:B1

OUTPUT SIGNAL POWER

63 111111 Max

62 111110 Max - 0.5dB

61 111101 Max - 1.0dB

:: :

49 110001 Max - 7dB

48 110000 Max - 7.5dB

47 101111 Max - 8dB

46 101110 Max - 8dB

45 101101 Max - 9dB

44 101100 Max - 9dB

:: :

5 000101 Max - 29dB

4 000100 Max - 29dB

3 000011 Max - 30dB

2 000010 Max - 30dB

1 000001 Max - 30dB

0 000000 Max - 30dB

Figure 1. System Timing Diagram

POWER SUPPLY

POWER

3-WIRE SERIAL INTERFACE AVAILABLE

XTAL-OSC

SHDN

RXENA

TXENA

MAC SPI MAC

SCLK

DIN

SHUTDOWN

RECEIVER ON

TRANSMITTER ON

CS (SELECT)

MAX2828/MAX2829

SCLK (CLOCK)

DIN (DATA)

PABIAS

PA BIAS D/A

(DRIVES RF T/R SWITCH)

(DRIVES RF T/R SWITCH AND PA ON/OFF)

SPI: PROGRAM 2.4GHz OR 5GHz MODE, CHANNEL FREQUENCY, PA BIAS, TRANSMITTER LINEARITY, RECEIVER RSSI OPERATION, CALIBRATION MODE, ETC.

(DRIVES POWER RAMP CONTROL)

SHUTDOWN

MODE

STANDBY

MODE

0 TO 7µs

RECEIVE

MODE

PA ENABLE

TRANSMIT

MODE

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 15

A3D12D13 A0A1D0

DIN

CSS

SCLK

CSO

CSW

CSH

CS1

Figure 2. 3-Wire Serial-Interface Timing Diagram

Typical Operating Characteristics

(VCC= 2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN = CS = high, RXHP = SCLK = DIN =

low, R

BIAS

= 11kΩ, TA= +25°C using the MAX2828/MAX2829 evaluation kits.)

100

110

105

125

120

115

135

130

140

2.7 3.0 3.12.8 2.9 3.2 3.3 3.4 3.5 3.6

RX ICC vs. V

MAX2828/9 toc01

VCC (V)

(mA)

TA = +85°C

= +25°C

= -40°C

105

115

110

130

125

120

145

135

155

150

140

2.7 3.0 3.12.8 2.9 3.2 3.3 3.4 3.5 3.6

TX ICC vs. V

MAX2828/9 toc02

VCC (V)

(mA)

TA = +85°C

= +25°C

= -40°C

110

115

120

130

125

135

-35 -20 -15-30 -25 -10 -5 0

TX ICC vs. P

OUT

MAX2828/9 toc03

OUT

(dBm)

(mA)

010142 6 18 20 24 2812 164 8 22 26 30 32

NOISE FIGURE

vs. BASEBAND GAIN SETTINGS

MAX2828/9 toc04

GAIN SETTINGS

NF (dB)

LNA = LOW GAIN

LNA = MEDIUM GAIN

LNA = HIGH GAIN

100

010142 6 18 20 24 2812 164 8 22 26 30 32

RX VOLTAGE GAIN

vs. BASEBAND GAIN SETTINGS

MAX2828/9 toc05

GAIN SETTINGS

GAIN (dB)

LNA = LOW GAIN

LNA = MEDIUM GAIN

LNA = HIGH GAIN

-4

-2

-3

-1

25 7535 55 8545 65 95

RX IN-BAND OUTPUT P-1dB

vs. GAIN

MAX2828/9 toc06

GAIN (dB)

OUTPUT P-1dB (dBV

RMS

)

LNA MEDIUM-/HIGH-GAIN

SWITCH POINT

LNA LOW-/MEDIUMGAIN SWITCH POINT

802.11g

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

16 ______________________________________________________________________________________

RX I/Q DC OFFSET SETTLING RESPONSE

(-32dB BB VGA GAIN STEP)

MMAX2828/9 toc13

400ns/div

6mV

4mV

2mV

4 3

-80 -20-70 -60 -40 -10-50 -30 0

RX EVM vs. P

MAX2828/9 toc14

PIN (dBm)

EVM (%)

LNA = LOW GAIN

LNA = MEDIUM GAIN

LNA = HIGH GAIN

2.5

1.5

0.5

2.0

1.0

3.0

-29 -15-27 -25 -21 -11-17 -13-23 -19 -9

RX EVM vs. V

OUT

MAX2828/9 toc15

OUT

(dBV

RMS

)

EVM (%)

PIN = -50dBm

Typical Operating Characteristics (continued)

(VCC= 2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN = CS = high, RXHP = SCLK = DIN =

low, R

BIAS

= 11kΩ, TA= +25°C using the MAX2828/MAX2829 evaluation kits.)

-110 -50 -30-90 -70 -10

OFDM EVM WITH OFDM JAMMER vs. OFDM JAMMER

LEVEL WITH JAMMER OFFSET FREQUENCY

MAX2828/9 toc07

JAMMER

(dBm)

EVM (%)

PIN = -62dBm

OFFSET

= 20MHz

OFFSET

= 25MHz

OFFSET

= 40MHz

OFFSET

= 100MHz

1.0

0.5

2.5

2.0

1.5

3.0

-120 -20-100 -60 0-80 -40 20

RX RSSI OUTPUT vs. INPUT POWER

MAX2828/9 toc08

PIN (dBm)

RSSI OUTPUT (V)

LNA = LOW GAIN

LNA = MEDIUM GAIN

LNA = HIGH GAIN

-140

-120

-130

-60

-80

-100

-110

-50

-70

-90

-40

1GHz 7GHz

(dBm)

RX EMISSION SPECTRUM, LNA INPUT

(TX OFF, LNA = LOW GAIN)

MAX2828/9 toc09

RX I/Q DC OFFSET SETTLING RESPONSE

(-8dB BB VGA GAIN STEP)

MAX2828/9 toc10

20ns/div

6mV

4mV

2mV

RX I/Q DC OFFSET SETTLING RESPONSE

(+8dB BB VGA GAIN STEP)

MAX2828/9 toc11

20ns/div

6mV

4mV

2mV

RX I/Q DC OFFSET SETTLING RESPONSE

(-16dB BB VGA GAIN STEP)

MAX2828/9 toc12

400ns/div

6mV

4mV

2mV

802.11g

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 17

1k 10k 100k 1M 10M

CLOSED-LOOP PHASE NOISE

MAX2828/9 toc22

FREQUENCY OFFSET (Hz)

(dBm)

-140

-130

-120

-110

-100

-90

-80

-70

-60

-50

-150

(kHz)

-40

-30

-20

-10

-50 0 250

TIME (µs)

CHANNEL-SWITCHING FREQUENCY SETTLING

(2500MHz TO 2400MHz)

MAX2828/9 toc23

-25kHz

5kHz/div

25kHz

TIME (µs)

TX-RX TURNAROUND

FREQUENCY SETTLING

MAX2828/9 toc24

Typical Operating Characteristics (continued)

(VCC= 2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN = CS = high, RXHP = SCLK = DIN =

low, R

BIAS

= 11kΩ, TA= +25°C using the MAX2828/MAX2829 evaluation kits.)

-6

-5

-1

-3

-2

-4

2.7 3.42.8 2.9 3.1 3.3 3.53.0 3.2 3.6

TX OUTPUT POWER vs. V

(B6:B1 = 111111)

MAX2828/9 toc16

VCC (V)

OUT

(dBm)

TA = +85°C

= +25°C

= -40°C

-6

-5

-1

-3

-2

-4

2.40 2.482.42 2.44 2.46 2.50

TX OUTPUT POWER vs. FREQUENCY

(B6:B1 = 111111)

MAX2828/9 toc17

FREQUENCY (GHz)

OUT

(dBm)

TA = +85°C

= +25°C

= -40°C

-100

-40

-60

-80

-90

-20

-30

-50

(dBm/100kHz)

-70

-10

2.397GHz 2.477GHz

TX OUTPUT SPECTRUM

(54Mbps OFDM SIGNAL)

MAX2828/9 toc18

B6:B1 = 111011

B6:B1 = 110101

-100

-40

-60

-80

-90

-20

-30

-50

-70

-10

1MHz

(dBm)

26.5GHz

TX OUTPUT SPECTRUM

MAX2828/9 toc19

f = 2.4GHz

f = 2.48GHz

f = 2.56GHz

f = 6.4GHz

-35

-25

-30

-5

-15

OUT

(dBm)

-20

-10

0 8 16 24 32 40 48 64

GAIN SETTINGS

TX OUTPUT POWER

vs. GAIN SETTINGS

MAX2828/9 toc20

2.30

2.32

2.40

2.36

2.58

2.48

RF LO (GHz)

2.44

2.52

2.38

2.34

2.56

2.54

2.46

2.42

2.50

2.60

0.4 0.6 0.8 1.0 1.2 1.4 1.6 2.4 V

TUNE

(V)

2.01.8 2.2

LO FREQUENCY

vs. V

TUNE

MAX2828/9 toc21

802.11g

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

18 ______________________________________________________________________________________

102

802.11g TX P

OUT

AT 2.4GHz

MAX2828/9 toc31

1σ/div

MEAN = -3.32dB DEV = 0.518dB SAMPLE SIZE = 2196

1.50

1.70

1.60

1.90

EVM (%)

1.80

1.65

1.55

1.85

1.75

1.95

2.00

-35 -30 -25 -20 0 P

OUT

(dBm)

-10-15 -5

TX EVM vs. P

OUT

MAX2828/9 toc25

115

138

RX STATIC DC OFFSET

MAX2828/9 toc26

1σ/div

MEAN = -826µV DEV = 1.75mV SAMPLE SIZE = 2270

128

160

192

RX GAIN IMBALANCE

MAX2828/9 toc27

1σ/div

MEAN = 0.044dB DEV = 0.08dB SAMPLE SIZE = 2221

128

160

192

RX PHASE IMBALANCE

MAX2828/9 toc28

1σ/div

MEAN = 90.2° DEV = 0.63

SAMPLE SIZE = 2221

108

TX LO LEAKAGE

MAX2828/9 toc29

1σ/div

MEAN = -29.5dBc DEV = 5.23dB SAMPLE SIZE = 2196

120

144

TX SIDEBAND SUPPRESSION

MAX2828/9 toc30

1σ/div

MEAN = -46.1dBc DEV = 4.94dB SAMPLE SIZE = 2196

Typical Operating Characteristics (continued)

(VCC= 2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN = CS = high, RXHP = SCLK = DIN =

low, R

BIAS

= 11kΩ, TA= +25°C using the MAX2828/MAX2829 evaluation kits.)

802.11g

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 19

Typical Operating Characteristics (continued)

(VCC= 2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN = CS = high, RXHP = SCLK = DIN =

low, R

BIAS

= 11kΩ, TA= +25°C using the MAX2828/MAX2829 evaluation kits.)

802.11a

120

115

125

130

140

135

145

-35 -20 -15-30 -25 -10 -5 0

TX ICC vs. P

OUT

MAX2828/9 toc34

OUT

(dBm)

(mA)

010142 6 18 20 24 2812 164 8 22 26 30 32

NOISE FIGURE

vs. BASEBAND GAIN SETTINGS

MAX2828/9 toc35

GAIN SETTINGS

NF (dB)

5.25GHz

5.85GHz

5.25GHz

5.85GHz

LNA = MEDIUM

LNA = LOW

LNA = HIGH

4.9 5.4 5.65.0 5.2 5.8 5.95.5 5.75.1 5.3

NOISE FIGURE vs. FREQUENCY

MAX2828/9 toc36

FREQUENCY (GHz)

NF (dB)

GAIN = 15dB, B7:B6 = 0X

GAIN = 45dB, B7:B6 = 10

GAIN = 50dB, B7:B6 = 11

GAIN > 65dB, B7:B6 = 11

100

120

010142 6 18 20 24 2812 164 8 22 26 30 32

RX VOLTAGE GAIN

vs. BASEBAND GAIN SETTING

MAX2828/9 toc37

GAIN SETTINGS

GAIN (dB)

LNA = LOW GAIN

LNA = MEDIUM GAIN

LNA = HIGH GAIN

-6

-4

-2

4.9 5.5 5.75.0 5.3 5.95.6 5.85.1 5.2 5.4

RX VOLTAGE GAIN VARIATION

vs. FREQUENCY

MAX2828/9 toc38

FREQUENCY (MHz)

GAIN VARIATION (dB)

LNA = HIGH GAIN

LNA = MEDIUM GAIN

LNA = LOW GAIN

-4

-2

-3

-1

25 7535 55 8545 65 95

RX IN-BAND OUTPUT P-1dB

vs. GAIN

MAX2828/9 toc39

GAIN (dB)

OUTPUT P-1dB (dBV

RMS

)

LNA MEDIUM-/HIGH-GAIN

SWITCH POINT

1.0

0.5

2.5

2.0

1.5

3.0

-110 -10-90 -50 10-70 -30

RX RSSI OUTPUT vs. INPUT POWER

MAX2828/9 toc40

PIN (dBm)

RSSI OUTPUT (V)

LNA = LOW GAIN

LNA = MEDIUM GAIN

LNA = HIGH GAIN

110

120

150

140

130

170

160

2.7 3.0 3.12.8 2.9 3.2 3.3 3.4 3.5 3.6

RX ICC vs. V

MAX2828/9 toc32

VCC (V)

(mA)

TA = +85°C

= +25°C

= -40°C

100

110

140

130

120

160

150

2.7 3.0 3.12.8 2.9 3.2 3.3 3.4 3.5 3.6

TX ICC vs. V

MAX2828/9 toc33

VCC (V)

(mA)

TA = +85°C

= +25°C

= -40°C

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

20 ______________________________________________________________________________________

-12

-6

-10

-4

-8

-2

-0

4.9 5.6 5.7 5.85.0 5.1 5.2 5.3 5.4 5.5 5.9

TX OUTPUT POWER vs. FREQUENCY

(B6:B1 = 111111)

MAX2828/9 toc49

FREQUENCY (GHz)

OUT

(dBm)

TA = +85°C

= +25°C

= -40°C

RX I/Q DC OFFSET SETTLING RESPONSE

(-8dB BB VGA GAIN STEP)

MAX2828/9 toc43

20ns/div

6mV

4mV

2mV

RX I/Q DC OFFSET SETTLING RESPONSE

(-16dB BB VGA GAIN STEP)

MAX2828/9 toc44

400ns/div

6mV

4mV

2mV

RX I/Q DC OFFSET SETTLING RESPONSE

(-32dB BB VGA GAIN STEP)

MAX2828/9 toc45

400ns/div

6mV

4mV

2mV

-80 -20-70 -60 -40 -10-50 -30 0

RX EVM vs. P

MAX2828/9 toc46

PIN (dBm)

EVM (%)

LNA = LOW GAIN

LNA = MEDIUM GAIN

LNA = HIGH GAIN

2.5

1.5

0.5

2.0

1.0

3.0

3.5

4.0

-29 -15-27 -25 -21 -11-17 -13-23 -19 -9

RX EVM vs. V

OUT

(dBV

RMS

)

EVM (%)

PIN = -50dBm

MAX2828/9 toc47

-9

-8

-4

-6

-3

-5

-7

-2

2.7 3.42.8 2.9 3.1 3.3 3.53.0 3.2 3.6

TX OUTPUT POWER vs. V

(B6:B1 = 111111)

MAX2828/9 toc48

VCC (V)

OUT

(dBm)

TA = +85°C

= +25°C

= -40°C

-90

-60

-70

-80

-85

-55

-65

(dBm)

-75

-50

1GHz 14GHz

RX EMISSION SPECTRUM, LNA INPUT

(TX OFF, LNA = LOW GAIN)

MAX2828/9 toc41

f = 4.1GHz

f = 8.3GHz

RX I/Q DC OFFSET SETTLING RESPONSE

(+8dB BB VGA GAIN STEP)

MAX2828/9 toc42

20ns/div

6mV

4mV

2mV

Typical Operating Characteristics (continued)

(VCC= 2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN = CS = high, RXHP = SCLK = DIN =

low, R

BIAS

= 11kΩ, TA= +25°C using the MAX2828/MAX2829 evaluation kits.)

802.11a

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 21

Typical Operating Characteristics (continued)

(VCC= 2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN = CS = high, RXHP = SCLK = DIN =

low, R

BIAS

= 11kΩ, TA= +25°C using the MAX2828/MAX2829 evaluation kits.)

802.11a

-40

-30

-35

-10

-5

-20

OUT

(dBm)

-25

-15

0 8 16 24 32 40 48 64

GAIN SETTINGS

TX OUTPUT POWER

vs. GAIN SETTINGS

MAX2828/9 toc52

LO FREQUENCY vs. V

TUNE

MAX2828/29 toc53

TUNE

(V)

LO FREQUENCY (MHz)

2.01.81.4 1.60.8 1.0 1.20.6

4600

4800

5000

5200

5400

5600

5800

6000

6200

4400

0.4 2.2

HIGH-BAND VCO D10:D9 = 11

D10:D9 = 11

LOW-BAND VCO

101001

0250

CHANNEL-SWITCHING FREQUENCY SETTLING

(5.35GHz TO 5.15GHz)

MAX2828/9 toc55

(kHz)

TIME (µs)

-40

-30

-20

-10

-50

0250

CHANNEL-SWITCHING FREQUENCY SETTLING

(5.875GHz TO 4.9GHz)

MAX2828/9 toc56

(kHz)

TIME (µs)

-40

-30

-20

-10

-50

TX-RX TURNAROUND

FREQUENCY SETTLING

MAX2828/9 toc57

25kHz

-25kHz

5kHz/div

050

TIME (µs)

1.7

2.1

1.9

EVM (%)

2.3

2.0

1.8

2.2

2.4

-35 -30 -25 -20 0 P

OUT

(dBm)

-10-15 -5

TX EVM

vs. P

OUT

MAX2828/9 toc58

1k 10k 100k 1M 10M

CLOSED-LOOP PHASE NOISE

MAX2828/9 toc54

FREQUENCY OFFSET (Hz)

(dBm)

-140

-130

-120

-110

-100

-90

-80

-70

-60

-50

-150

-110

-40

-70

-90

-100

-20

-50

-30

-60

-80

-10

5.21GHz

(dBm/100kHz)

5.29GHz

TX OUTPUT SPECTRUM (54Mbps OFDM SIGNAL)

MAX2828/9 toc50

B6:B1 = 111100

-40

-70

-90

-100

-20

-50

-30

-60

-80

-10

1MHz 26.5GHz

TX OUTPUT SPECTRUM

MAX2828/9 toc51

f = 8.2GHz

f = 7.2GHz

f = 6.2GHz

f = 5.2GHz

(dBm)

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

22 ______________________________________________________________________________________

RX RSSI STEP RESPONSE

(-40dB SIGNAL STEP)

MAX2828/9 toc67

1.5V

0.5V

200ns/div

160

120

200

240

RX PHASE IMBALANCE

MAX2828/9 toc61

1σ/div

MEAN = 90.3° DEV = 0.55

SAMPLE SIZE = 2268

TX LO LEAKAGE

MAX2828/9 toc62

1σ/div

MEAN = -29.5dBc DEV = 5.24dB SAMPLE SIZE = 2236

TX SIDEBAND SUPPRESSION

MAX2828/9 toc63

1σ/div

MEAN = -47.9dBc DEV = 3.3dB SAMPLE SIZE = 2237

102

802.11a TX P

OUT

AT 5.25GHz

4MAX2828/9 toc64

1σ/div

MEAN = -2.8dB DEV = 0.68dB SAMPLE SIZE = 2237

I/Q OUTPUT DC ERROR DROOP

(RXHP = 1–0; A3:A1 = 1000, D2 = 0)

MAX2828/9 toc65

20ms/div

20mV/div

RX RSSI STEP RESPONSE

(+40dB SIGNAL STEP)

MAX2828/9 toc66

1.5V

0.5V

200ns/div

115

138

RX STATIC DC OFFSET

MAX2828/9 toc59

1σ/div

MEAN = -826µV DEV = 1.75mV SAMPLE SIZE = 2270

124

155

186

RX GAIN IMBALANCE

MAX2828/9 toc60

1σ/div

MEAN = -0.007dB DEV = 0.08dB SAMPLE SIZE = 2268

Typical Operating Characteristics (continued)

(VCC= 2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN = CS = high, RXHP = SCLK = DIN =

low, R

BIAS

= 11kΩ, TA= +25°C using the MAX2828/MAX2829 evaluation kits.)

802.11a

802.11g/802.11a

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 23

RX I/Q COMMON-MODE VOLTAGE SPREAD

MAX2828/9 toc76

1σ/div

MEAN = 917mV DEV = 17.2mV SAMPLE SIZE = 2270

RX BB VGA SETTLING RESPONSE

(-16dB GAIN STEP)

MAX2828/9 toc70

1.5V

0.5V

40ns/div

RX BB VGA SETTLING RESPONSE

(-32dB GAIN STEP)

MAX2828/9 toc71

1.5V

0.5V

40ns/div

RX BB FREQUENCY RESPONSE

vs. FINE SETTING (COARSE SETTING = 9.5MHz)

MAX2828/9 toc72

-15

-30

-45

-60

-75

-105

-90

-120

-135 70MHz1MHz

(dB)

RX BB FREQUENCY RESPONSE

vs. COARSE SETTING (FINE SETTING = 010)

MAX2828/9 toc73

-15

-30

-45

-60

-75

-105

-90

-120

-135 70MHz1MHz

(dB)

-10

-20

-30

-40

-50

-60

-70

-80

-90 110100

TX BASEBAND FREQUENCY RESPONSE

MAX2828/9 toc74

OUT

(dBm)

EVM (%)

156342 7 8 9 10 11

GROUP DELAY RIPPLE

vs. FREQUENCY (COARSE SETTING = 9.5MHz)

MAX2828/9 toc75

FREQUENCY (MHz)

GROUP DELAY RIPPLE (ns)

Typical Operating Characteristics (continued)

(VCC= 2.7V, fRF= 2.437GHz (802.11g) or fRF= 5.25GHz (802.11a), f

REFOSC

= 40MHz, SHDN = CS = high, RXHP = SCLK = DIN =

low, R

BIAS

= 11kΩ, TA= +25°C using the MAX2828/MAX2829 evaluation kits.)

RX BB VGA SETTLING RESPONSE

(+8dB GAIN STEP)

MAX2828/9 toc68

0.3V

0.2V

0.1V

40ns/div

RX BB VGA SETTLING RESPONSE

(-8dB GAIN STEP)

MAX2828/9 toc69

0.8V

0.6V

0.4V

0.2V

40ns/div

802.11g/802.11a

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

24 ______________________________________________________________________________________

Block Diagrams/Typical Operating Circuits

Tx ANALOG INPUT

SIGNAL FROM BASEBAND IC

REFERENCE OSCILLATOR INPUT

SERIAL INPUT FROM

BASEBAND IC

Rx ANALOG OUTPUT

TO BASEBAND IC

5GHz Tx RF OUTPUT

TO BPF AND PA

PA BIAS CURRENT

TO PA

MODE-CONTROL

LOGIC SIGNAL FROM

BASEBAND IC

5GHz Rx RF OUTPUT FROM

SWITCH AND BPF

Rx FRONT-END GAIN-CONTROL BIT

FROM BASEBAND IC

Rx FRONT-END AND Tx BASEBAND

GAIN-CONTROL BIT FROM

BASEBAND IC

Rx/Tx BASEBAND-CONTROL BITS FROM

BASEBAND IC

CONTROL BIT FROM BASEBAND IC

MODE-CONTROL LOGIC SIGNAL FROM BASEBAND IC

RSSI OUTPUT

MODE-CONTROL LOGIC SIGNAL FROM BASEBAND IC

LOCK-DETECT OUTPUT TO BASEBAND IC

0.5pF

1.2pF

620Ω

300Ω

10nF

C1 150pF

C2 560pF

2nH

1.8nH

N.C.

GND

RXRFH

GND

TXRFH+

GND

TXRFH-

TXENA

PABIAS

TXBBI+

TXBBI-

TXBBQ+

TXBBQ-

BIAS

REF

GND

DIN

SCLK

RXENA

RXHP

RSSI

BYPASS

GND

CPOUT

GND

ROSC

RXBBI+

RXBBI-

RXBBQ+

RXBBQ-

15 16 17 18 19 201421 22 23 24 25 26 27 28

55 54 53 52 51 50 49 48 47 46 45 44 4356

TUNE

MAX2828

SHDN

MUX

RSSI

MUX

PLL

SERIAL

INTERFACE

0°

90°

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 25

Block Diagrams/Typical Operating Circuits (continued)

Tx ANALOG INPUT

SIGNAL FROM

BASEBAND IC

REFERENCE OSCILLATOR INPUT

SERIAL INPUT FROM

BASEBAND IC

Rx ANALOG OUTPUT

TO BASEBAND IC

5GHz Tx RF OUTPUT

TO BPF AND PA

PA BIAS CURRENT

TO PA

MODE-CONTROL LOGIC

SIGNAL FROM BASEBAND IC

5GHz Rx RF OUTPUT FROM

SWITCH AND BPF

Rx FRONT-END GAIN-CONTROL BIT

FROM BASEBAND IC

Rx FRONT-END AND Tx BASEBAND

GAIN-CONTROL BIT FROM

BASEBAND IC

Rx/Tx BASEBAND-CONTROL BITS FROM

BASEBAND IC

CONTROL BIT FROM BASEBAND IC

MODE-CONTROL LOGIC SIGNAL FROM BASEBAND IC

RSSI OUTPUT

MODE-CONTROL LOGIC SIGNAL FROM BASEBAND IC

LOCK-DETECT OUTPUT TO BASEBAND IC

0.5pF

1.2pF

620Ω

300Ω

10nF

C1 150pF

C2 560pF

2nH

2.4GHz TX RF OUTPUT TO BPF AND PA

1.8pF

6.8nH

RXRFL

TXRFL+

TXRFL-

GND

RXRFH

GND

TXRFH+

GND

TXRFH-

TXENA

PABIAS

TXBBI+

TXBBI-

TXBBQ+

TXBBQ-

BIAS

REF

GND

DIN

SCLK

RXENA

RXHP

RSSI

BYPASS

GND

CPOUT

GND

ROSC

RXBBI+

RXBBI-

RXBBQ+

RXBBQ-

15 16 17 18 19 201421 22 23 24 25 26 27 28

55 54 53 52 51 50 49 48 47 46 45 44 4356

TUNE

MAX2829

SHDN

MUX

RSSI

MUX

PLL

SERIAL

INTERFACE

0°

90°

0°

90°

3.6nH

8.2pF

1pF

2.40GHz Rx RF OUTPUT FROM SWITCH AND BPF

÷2

1.8nH

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

26 ______________________________________________________________________________________

Pin Description

NAME FUNCTION

1 1 B6 Rx Front-End and Tx Gain-Control Digital Input Bit 6

22V

2.4GHz/5GHz LNA Supply Voltage. Bypass with a capacitor as close to the pin as possible. Do not share the bypass-capacitor ground vias with any other branches.

3 3 B7 Rx Front-End Gain-Control Digital Input Bit 7

— N.C. No Connection. Leave unconnected.

5 5 GND

LNA Ground. Make connections to ground vias as short as possible. Do not share ground vias with any of the other branches.

6 6 RXRFH 5GHz Single-Ended LNA Input. Requires AC-coupling and external matching network.

7 7 GND

LNA Ground. Make connections to ground vias as short as possible. Do not share ground vias with any other branches.

9 9 TXRFH-

5GHz Tx PA Driver Differential Outputs. Requires AC-coupling and external matching network (and balun) to the external PA input.

10 10 V

Tx RF Supply Voltage. Bypass with a capacitor as close to the pin as possible. Do not share the bypass-capacitor ground vias with any other branches.

13 13 TXENA Tx Mode Enable Digital Input. Set high to enable Tx (see Figure 1).

14 14 PABIAS DAC Current Output. Connect directly to the external PA bias pin.

15 15 V

Tx Baseband Filter Supply Voltage. Bypass with a capacitor as close to the pin as possible. Do not share the bypass-capacitor ground vias with any other branches.

16 16 TXBBI+

17 17 TXBBI-

Tx Baseband I-Channel Differential Inputs

18 18

19 19

Tx Baseband Q-Channel Differential Inputs

20 20 V

Tx Upconverter Supply Voltage. Bypass with a capacitor as close to the pin as possible. Do not share the bypass-capacitor ground vias with any other branches.

21 21 R

BIAS

This Analog Voltage Input is Internally Biased to a Bandgap Voltage. Connect an external precision 11kΩ resistor or current source between this pin and ground to set the bias current for the device.

22 22 V

Reference Circuit Supply Voltage. Bypass with a capacitor as close to the pin as possible. Do not share the bypass-capacitor ground vias with any other branches.

23 23 V

REF

Reference Voltage Output

24 24 GND

Digital Circuit Ground. Make connections to ground vias as short as possible. Do not share ground vias with any other branches.

25 25 V

Digital Circuit Supply Voltage. Bypass with a capacitor as close to the pin as possible. Do not share the bypass-capacitor ground vias with any other branches.

MAX2828 MAX2829

4, 11, 12

TXRFH+

TXBBQ+

TXBBQ-

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 27

Pin Description (continued)

MAX2828

NAME FUNCTION

26 26 DIN Data Digital Input of 3-Wire Serial Interface (See Figure 2)

27 27 SCLK Clock Digital Input of 3-Wire Serial Interface (See Figure 2) 28 28 CS Active-Low Enable Digital Input of 3-Wire Serial Interface (See Figure 2)

29 29 LD

Lock-Detect Digital Output of Frequency Synthesizer. Output high indicates that the frequency synthesizer is locked.

30 30 ROSC Reference Oscillator Input. Connect an external reference oscillator to this analog input.

31 31 V

PLL Charge-Pump Supply Voltage. Bypass with a capacitor as close to the pin as possible. Do not share the bypass-capacitor ground vias with any other branches.

32 32 GND

Charge-Pump Circuit Ground. Make connections to ground vias as short as possible. Do not share ground vias with any other branches.

33 33 CPOUT

Charge-Pump Output. Connect the frequency synthesizer’s loop filter between CPOUT and TUNE. Keep the line from this pin to the tune input as short as possible to prevent spurious pickup. Connect C2 as close to CPOUT as possible. Do not share the capacitor ground vias with any other branches (see the Typical Operating Circuit).

34 34 GND

Ground. Make connections to ground vias as short as possible. Do not share ground vias with any other branches.

35 35 GND

VCO Ground. Make connections to ground vias as short as possible. Do not share ground vias with any other branches.

36 36 TUNE

VCO TUNE Input. Connect C1 as close to TUNE as possible. Connect the ground of C1 to VCO ground. Do not share the capacitor ground vias with any other branches (see the Typical Operating Circuit).

37 37

Bypass with a 0.1µF Capacitor to GND. The capacitor is used by the on-chip VCO voltage regulator.

38 38 V

VCO Supply Voltage. Bypass to system ground as close as possible to the pin with capacitors. Do not share the ground vias for the bypass capacitors with any other branches.

39 39 SHDN Active-Low Shutdown Digital Input. Set high to enable the device.

40 40 RSSI RSSI or Temperature-Sensor Multiplexed Output

41 41 RXENA Rx Mode Enable Digital Input. Set high to enable Rx.

42 42 RXHP

Rx Baseband AC-Coupling Highpass Corner Frequency Control Digital Input Selection Bit

43 43

44 44

Rx Baseband Q-Channel Differential Outputs. In Tx calibration mode, these pins are the LO leakage and sideband-detector outputs.

45 45 RXBBI-

46 46 RXBBI+

Rx Baseband I-Channel Differential Outputs. In Tx calibration mode, these pins are the LO leakage and sideband-detector outputs.

47 47 V

Rx Baseband Buffer Supply Voltage. Bypass with a capacitor as close to the pin as possible. Do not share the bypass-capacitor ground vias with any other branches.

48 48 B1 Rx/Tx Gain-Control Digital Input Bit 1

49 49 V

Rx Baseband Filter Supply Voltage. Bypass with a capacitor as close to the pin as possible. Do not share the bypass-capacitor ground vias with any other branches.

MAX2829

BYPASS

RXBBQ-

RXBBQ+

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

28 ______________________________________________________________________________________

Detailed Description

The MAX2828/MAX2829 single-chip, RF transceiver ICs are designed for WLAN applications. The MAX2828 is designed for 5GHz 802.11a (OFDM), and the MAX2829 is designed for dual-band 2.4GHz 802.11b/g and 5GHz

802.11a. The ICs include all circuitry required to implement the RF transceiver function, fully integrating the receive path, transmit path, VCO, frequency synthesizer, and baseband/control interface.

Modes of Operation

The MAX2828/MAX2829 have seven primary modes of operation: shutdown, SPI reset, standby, transmit, receive, transmitter calibration, and receiver calibration (see Table 5).

Pin Description (continued)

MAX2828

NAME FUNCTION

50 50 B2 Rx/Tx Gain-Control Digital Input Bit 2

51 51 GND

Rx IF Ground. Make connections to ground vias as short as possible. Do not share ground vias with any other branches.

52 52 V

Rx IF Supply Voltage. Bypass with a capacitor as close to the pin as possible. Do not share the bypass-capacitor ground vias with any other branches.

53 53 B3 Rx/Tx Gain-Control Digital Input Bit 3

54 54 B4 Rx/Tx Gain-Control Digital Input Bit 4

55 55 V

Rx Downconverter Supply Voltage. Bypass with a capacitor as close to the pin as possible. Do not share the bypass-capacitor ground vias with any other branches.

56 56 B5 Rx/Tx Gain-Control Digital Input Bit 5

— 4 RXRFL 2.4GHz Single-Ended LNA Input. Requires AC-coupling and external matching network.

— 11

— 12 TXRFL-

2.4GHz Tx PA Driver Differential Outputs. Requires AC-coupling and external matching network (and balun) to the external PA input.

EP EP

EXPOSED

Exposed Paddle. Connect to the ground plane with multiple vias for proper operation and heat dissipation.

Table 5. Mode Table

X = Don’t care or do not apply.

SPI is a trademark of Motorola, Inc.

MAX2829

TXRFL+

PADDLE

MODE

SPI™ Reset 0 1 1 X

Shutdown 0 0 0 X

Standby 1 0 0 X

Rx 1 0 1 X

Tx 1 1 0 X

Tx Calibration 1 1 0

Rx Calibration 1 0 1

LOGIC PINS

SHDN TXENA RXENA

SETTINGS

Calibration

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 29

Shutdown Mode

Shutdown mode is achieved by driving SHDN low. In shutdown mode, all circuit blocks are powered down, except for the serial interface. While the device is in shutdown, the values of the serial interface registers are maintained and can be changed as long as V

(pin 25) is applied.

SPI Reset

By driving RXENA and TXENA high while setting SHDN low, all circuit blocks are powered down, as in shutdown mode. However, in SPI reset mode, all registers are returned to their default states. It is recommended to reset the SPI and all registers at the start of power-up to ensure that the registers are set to the correct values (see Table 9).

Standby Mode

To place the device in standby mode, set SHDN high and RXENA and TXENA low. This mode is mainly used to enable the frequency synthesizer block while the rest of the device is powered down. In this mode, various blocks in the system can be selectively turned on or off according to the standby register table (Table 10).

Receive (Rx) Mode

To place the device in Rx mode, set RXENA high. All receiver blocks are enabled in this mode.

Transmit (Tx) Mode

To place the device in Tx mode, set TXENA high. All transmitter blocks are enabled in this mode.

Tx/Rx Calibration Mode

The MAX2828/MAX2829 feature Tx/Rx calibration modes to detect I/Q imbalances and transmit LO leakage. In the Tx calibration mode, the LO leakage calibration is done only for the LO leakage signal that is present at the center frequency of the channel (i.e., in the middle of the OFDM or QPSK spectrum). The LO leakage calibration includes the effect of all DC offsets in the entire baseband paths of the I/Q modulator, and also includes direct leakage of the LO to the I/Q modulator output.

The transmitter LO leakage and sideband-detector output is taken at the receiver I- or Q-channel output during this calibration phase.

During Tx LO leakage and I/Q imbalance calibration, a sine and cosine signal (f = f

TONE

) is input to the baseband I/Q Tx pins from the baseband IC. At the LO leakage and sideband-detector output, the LO leakage corresponds to the signal at f

TONE

and the sideband

suppression corresponds to the signal at 2 x f

TONE

. The output power of these signals vary 2dB for 1dB of variation in the LO leakage and unwanted sideband levels. To calibrate the Tx path, first set the powerdetector gain to 8dB (Table 14). Adjust the DC offset of the baseband inputs to minimize the signal at f

TONE

(LO leakage). Then, adjust the baseband input relative magnitude and phase offsets to reduce the signal at 2 x f

TONE

. If required, calibration can be done with higher LO leakage and sideband-detector gain settings to decrease LO leakage and increase image suppression.

After calibrating the transmitter, receiver calibration can be done. In Rx calibration mode, the calibrated Tx RF signal is internally routed to the Rx downconverter inputs. In this loopback calibration mode, the voltage regulator must be able to source 350mA total since both Tx and Rx are turned on simultaneously.

RF Synthesizer Programming

in 5GHz Mode

In the 5GHz mode, the RF frequency synthesizer covers a 4.9GHz to 5.9GHz range. To achieve this large tuning range while maintaining excellent noise performance, the 1GHz band is divided into sub-bands within which the VCO is tuned. The selection of the appropriate VCO sub-band is done automatically by a finite state machine (FSM). The PLL settling time is approximately 300µs for a change of 1GHz in the channel frequency. A faster PLL settling can be achieved by overriding the FSM and manually programming the VCO sub-band.

Automatic VCO Sub-Band Selection

By enabling this band-selection mode, only 1 bit needs to be programmed to start the frequency acquisition. The FSM will automatically stop after it selects the correct VCO sub-band, and after the PLL has locked.

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

30 ______________________________________________________________________________________

The following steps should be followed:

1) Set D8 = 0 (A3:A0 = 0101) to enable the automatic VCO sub-band selection by the FSM.

2) Enable the PLL and VCO if required. If required, program the divider ratios corresponding to the desired channel frequency.

3) Set D7 = 1 (A3:A0 = 0101) to start the FSM. The FSM should only be started after PLL and VCO are enabled, or after channel frequency is changed.

4) The VCO sub-band selection and PLL settling time takes less than approximately 300µs. After the band switching is completed and the PLL has locked to the correct channel frequency, the FSM stops automatically.

Every time the channel frequency is programmed or the PLL+VCO is enabled, the FSM needs to be reset to be used again for the next time. This reset operation does not affect the PLL or VCO. To reset the FSM, set D7 = 0 (A3:A0 = 0101).

Every channel frequency maps to some VCO subband. Each VCO sub-band has a digital code, of which the 2 LSBs (B1:B0) are readable. The B1:B0 code can be read through pin LD by programming D3:D0 = 0111 (A3:A1 = 0000) for B1, or D3:D0 = 0110 (A3:A1 = 0000) for B0 (see Table 6).

Manual VCO Sub-Band Selection

For faster settling, the VCO sub-band (B1:B0) can be directly programmed through the SPI. First, the B1:B0 code for every channel frequency must be determined. Once this is known, the B1:B0 code is directly programmed along with the PLL divider values, for the given channel frequency. The PLL settling time in this case is approximately 50µs.

Large temperature changes (>+50°C) may cause the channel frequency to move into an adjacent sub-band. To determine the correct sub-band, two on-chip comparators monitor the VCO control voltage (V

TUNE

These comparator logic outputs can be read through

the LD pin to decide whether the frequency sub-band is correct or needs to be reprogrammed.

The following steps need to be followed to complete manual PLL frequency acquisition and VCO sub-band selection:

1) Set D8 = 1 (A3:A0 = 0101) to enable manual VCO sub-band selection.

2) Enable the PLL and VCO if required. If required, program the divider ratios corresponding to the desired channel frequency.

3) Set D10:D9 (A3:A0 = 0101) to program the VCO frequency sub-band according to Table 7. D10:D9 correspond to the same assignments as B1:B0. After D10:D9 are programmed, 50µs is required to allow the PLL to settle.

4) After 50µs of PLL settling time, the comparator outputs can be read through pin LD (see Table 8).

5) Based on the comparator outputs, the VCO frequency sub-band is programmed again according to Table 8 until the frequency acquisition is achieved.

Large Temperature Changes

If the PLL and VCO are continuously active (i.e., no reprogramming) and the die temperature changes by 50°C (as indicated by the on-chip temperature sensor), there is a possibility that the PLL may get unlocked due

B1 B0 VCO FREQUENCY BAND

0 0 Band 0 (lowest frequency band)

0 1 Band 1

1 0 Band 2

1 1 Band 3 (highest frequency band)

Table 6. B1:B0 VCO Sub-Band Assignments (Read Back Through LockDetect Pin)

D10 D9

PROGRAMMED VCO

FREQUENCY BAND

0 0 Band 0

0 1 Band 1

1 0 Band 2

1 1 Band 3

Table 7. D10:D9 VCO Sub-Band Assignments (For Programming Through SPI)

A3:A1 = 0000;

D3:D0 = 0101

A3:A1 = 0000;

RESPONSE

Program to a lower sub-band if VCO is not in Band 0.

0 1 No change.

Program to a higher sub-

band if VCO is not in Band 3.

Invalid state, does not occur.

Table 8. Comparator-Output Definition

D3:D0 = 0100

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 31

to the VCO drifting to an adjacent sub-band. In this case, it is advisable to reprogram the PLL by either manual or automatic sub-band selection.

Programmable Registers

The MAX2828/MAX2829 include 13 programmable, 18bit registers: 0, 1, standby, integer-divider ratio, fractional-divider ratio, band select and PLL, calibration, lowpass filter, Rx control/RSSI, Tx linearity/baseband gain, PA bias DAC, Rx gain, and Tx VGA gain. The 14 most significant bits (MSBs) are used for register data. The 4 least significant bits (LSBs) of each register contain the register address. Data is shifted in MSB first. The data sent to the devices, in 18-bit words, is framed by CS. When CS is low, the clock is active and data is shifted with the rising edge of the clock. When CS tran- sitions high, the shift register is latched into the register selected by the contents of the address bits. Only the last 18 bits shifted into the device are retained in the shift register. No check is made on the number of clock pulses. For programming data words less than 14 bits long, only the required data bits and the address bits are required to be shifted, resulting in faster Rx and Tx gain control where only the LSBs need to be pro-

DATA BIT

DESCRIPTION

D13 0

MIMO Select. Set to 0 for normal operation. Set to 1 for MIMO applications.

D12 1 Set to 1

D11 0 Voltage Reference (Pin 23)

D10 0 PA Bias DAC, in Tx Mode

D9 0

D8 0

D7 0

D6 0

D5 0

D4 0

D3 0

Set to 0

D2 1

D1 1

D0 1

Set to 1

Table 10. Standby Register (A3:A0 = 0010)

DEFAULT

ADDRESS

(A3:A0)

TABLE

0000 —

0001 —

Standby

0010 10

Integer-Divider

Ratio

0011 11

Fractional-

Divider Ratio

0100 12

Band Select

and PLL

0101 13

Calibration

0110 14

Lowpass Filter

0111 15

Control/RSSI

1000 16

Linearity/Base-

band Gain

1001 17

PA Bias DAC

1010 18

Rx Gain

1011 19

Tx VGA Gain

1100 20

Table 9. Register Default/SPI Reset Settings

D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

01000101000000

00000011001010

01000000000111

11000010100010

01110111011101

01100000100100

01110000000000

00000000101010

00000000100101

00001000000000

00001111000000

00000001111111

00000000000000

DEFAULT

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

32 ______________________________________________________________________________________

grammed. The interface can be programmed through the 3-wire SPI/MICROWIRE™-compatible serial port.

On startup, it is recommended to reset all registers by placing the device in SPI reset mode (Table 5).

Standby Register Definition (A3:A0 = 0010)

Various internal blocks can be turned on or off using the standby register (in standby mode, see Table 10). Setting a bit to 1 turns the block on, while setting a bit to 0 turns the block off.

Integer-Divider Ratio Register Definition

(A3:A0 = 0011)

This register contains the integer portion of the divider ratio of the synthesizer. This register, in conjunction with the fractional-divider ratio register, permits selection of a precise frequency. The main synthesizer divide ratio is an 8-bit value for the integer portion (see Table 11). Valid values for this register are from 128 to 255 (D7–D0). The default value is 210. D13 and D12 are reserved for the 2 LSBs of the fractional-divider ratio.

Fractional-Divider Ratio Register Definition

(A3:A0 = 0100)

This register (along with D13 and D12 of the integerdivider ratio register) controls the fractional-divider ratio with 16-bit resolution. D13 to D0 of this register combined with D13 and D12 of the integer-divider ratio register form the whole fractional-divider ratio (see Tables 12a and 12b).

DATA BIT

DESCRIPTION

D13 1

D12 1

2 LSBs of the Fractional-Divider Ratio

D11 0

D10 0

D9 0

D8 0

Set to 0

D7 1

D6 0

D5 1

D4 0

D3 0

D2 0

D1 1

D0 0

Integer-Divider Ratio Word Programming Bits. Valid values are from 128 (D7:D0 = 10000000) to 255 (D7:D0 = 11111111).

Table 11. Integer-Divider Ratio Register (A3:A0 = 0011)

INTEGER-DIVIDER

RATIO

FRACTIONAL-DIVIDER RATIO

(MHz)

(fRF x 4/3) / 20MHz

(DIVIDER RATIO)

A3:A0 = 0100, D13:D0 (hex) A3:A0 = 0011, D13:D12 (hex)

2412 160.8000 1010 0000 3333 00

2417 161.1333 1010 0001 0888 10

2422 161.4667 1010 0001 1DDD 11

2427 161.8000 1010 0001 3333 00

2432 162.1333 1010 0010 0888 10

2437

(default)

162.4667 1010 0010 1DDD 11

2442 162.8000 1010 0010 3333 00

2447 163.1333 1010 0011 0888 10

2452 163.4667 1010 0011 1DDD 11

2457 163.8000 1010 0011 3333 00

2462 164.1333 1010 0100 0888 10

2467 164.4667 1010 0100 1DDD 11

2472 164.8000 1010 0100 3333 00

2484 165.6000 1010 0101 2666 01

Table 12a. IEEE 802.11g Frequency Plan and Divider Ratio Programming Words

MICROWIRE is a trademark of National Semiconductor Corp.

DEFAULT

A3:A0 = 0011, D7:D0

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 33

INTEGER-DIVIDER

RATIO

FRACTIONAL-DIVIDER RATIO

(MHz)

X 4/5) / 20MHz

A3:A0 = 0100, D13:D0

(hex)

A3:A0 = 0011, D13:D12

(hex)

5180 207.2 1100 1111 0CCC 11

5200 208.0 1101 0000 0000 00

5220 208.8 1101 0000 3333 00

5240 209.6 1101 0001 2666 01

5260 210.4 1101 0010 1999 10

5280 211.2 1101 0011 0CCC 11

5300 212.0 1101 0100 0000 00

5320 212.8 1101 0100 3333 00

5500 220.0 1101 1100 0000 00

5520 220.8 1101 1100 3333 00

5540 221.6 1101 1101 2666 01

5560 222.4 1101 1110 1999 10

5580 223.2 1101 1111 0CCC 11

5600 224.0 1110 0000 0000 00

5620 224.8 1110 0000 3333 00

5640 225.6 1110 0001 2666 01

5660 226.4 1110 0010 1999 10

5680 227.2 1110 0011 0CCC 11

5700 228.0 1110 0100 0000 00

5745 229.8 1110 0101 3333 00

5765 230.6 1110 0110 2666 01

5785 231.4 1110 0111 1999 10

5805 232.2 1110 1000 0CCC 11

Table 12b. IEEE 802.11a Frequency Plan and Divider Ratio Programming Words

(DIVIDER RATIO)

A3:A0 = 0011, D7:D0

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

34 ______________________________________________________________________________________

Band-Select and PLL Register Definition

(A3:A0 = 0101)

This register configures the programmable-reference frequency dividers for the synthesizers, and sets the DC current for the charge pump. The programmablereference frequency divider provides the reference frequencies to the phase detector by dividing the crystal oscillator frequency (see Table 13).

Calibration Register Definition (A3:A0 = 0110)

This register configures the Rx/Tx calibration modes (See Table 14).

DATA BIT DEFAULT DESCRIPTION

D13 0 Set to 0 for Normal Operation. Set to 1 for MIMO applications.

D12 1

D11 1

Set D12:D11 = 11

D10 0

D9 0

These Bits Set the VCO Sub-Band when Programmed Using the SPI (D8 = 1). D10:D9 = 00: lowest frequency band; 11: highest frequency band.

D8 0

VCO SPI Bandswitch Enable. 0: disable SPI control, bandswitch is done by FSM; 1: bandswitch is done by SPI programming.

D7 0 VCO Bandswitch Enable. 0: disable; 1: start automatic bandswitch.

D6 0

RF Frequency Band Select in 802.11a Mode (D0 = 1). 0: 4.9GHz to 5.35GHz Band; 1: 5.47GHz to

5.875GHz Band.

D5 1 PLL Charge-Pump-Current Select. 0: 2mA; 1: 4mA.

D4 0 Set to 0

D3 0

D2 1

D1 0

These Bits Set the Reference-Divider Ratio. D3:D1 = 001 corresponds to R = 1 and 111 corresponds to R = 7.

D0 0 RF Frequency Band Select. 0: 2.4GHz Band; 1: 5GHz band.

Table 13. Band-Select and PLL Register (A3:A0 = 0101)

DATA BIT

DESCRIPTION

D13 0 Set to 0

D12 1

D11 1

Transmitter I/Q Calibration LO Leakage and Sideband-Detector Gain-Control Bits. D12:D11 = 00: 8dB; 01: 18dB; 10: 24dB; 11: 34dB

D10 1 Set to 1

D9 0

D8 0

D7 0

D6 0

D5 0

D4 0

D3 0

D2 0

Set to 0

D1 0

0: Tx Calibration Mode Disabled; 1: Tx Calibration Mode Enabled (Rx outputs provide the LO leakage and sideband-detector signal)

D0 0

0: RX Calibration Mode Disabled; 1: Rx Calibration Mode Enabled

Table 14. Calibration Register (A3:A0 = 0110)

DEFAULT

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 35

DATA BIT

DESCRIPTION

D13 0

D12 0

Set to 0

D11 0 RSSI High Bandwidth Enable. 0: 2MHz; 1: 6MHz

D10 0

D9 0

D8 0

D7 0

Set to 0

D6 0

D5 1

Tx LPF Corner Frequency Coarse Adjustment. D6:D5 = 00: undefined; 01: 12MHz (nominal mode); 10: 18MHz (turbo mode 1); 11: 24MHz (turbo mode 2).

D4 0

D3 1

Rx LPF Corner Frequency Coarse Adjustment. D4:D3 = 00: 7.5MHz; 01: 9.5MHz (nominal mode); 10: 14MHz (turbo mode 1); 11: 18MHz (turbo mode 2).

D2 0

D1 1

D0 0

Rx LPF Corner Frequency Fine Adjustment (Relative to the Course Setting). D2:D0 = 000: 90%; 001: 95%; 010: 100%; 011: 105%; 100: 110%.

Table 15. Lowpass-Filter Register (A3:A0 = 0111)

DATA BIT

DESCRIPTION

D13 0 Set to 0

D12 0

Enable Rx VGA Gain Programming Serially. 0: Rx VGA gain programmed with external digital inputs (B7:B1); 1: Rx VGA gain programmed with serial data bits in the Rx gain register (D6:D0).

D11 0 RSSI Output Range. 0: low range (0.5V to 2V); 1: high range (0.5V to 2.5V).

D10 0

RSSI Operating Mode. 0: RSSI disabled if RXHP = 0, and enabled if RXHP = 1; 1: RSSI enabled independent of RXHP (see Table 16c).

D9 0 Set to 0

D8 0

RSSI Pin Function. 0: outputs RSSI signal in Rx mode; 1: outputs temperature sensor voltage in Rx, Tx, and standby modes (see Table 16c).

D7 0

D6 0

Set to 0

D5 1 Set to 1

D4 0

D3 0

Set to 0

D2 1 Rx Highpass -3dB Corner Frequency when RXHP = 0. 0: 100Hz; 1: 30kHz

D1 0

D0 1

Set D1:D0 = 01

Table 16a. Rx Control/RSSI Register (A3:A0 = 1000)

Lowpass Filter Register Definition (A3:A0 = 0111)

This register allows the adjustment of the Rx and Tx lowpass filter corner frequencies (see Table 15).

Rx Control/RSSI Register Definition (A3:A0 = 1000)

This register allows the adjustment of the Rx section and the RSSI output (see Tables 16a and 16b).

DEFAULT

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

36 ______________________________________________________________________________________

Tx Linearity/Baseband Gain Register Definition

(A3:A0 = 1001)

This register allows the adjustment of the Tx gain and linearity (see Table 17).

RXHP

A3:A0 = 1000, D2

Rx HP -3dB CORNER

FREQUENCY

1 X 600kHz

0 1 30kHz

0 0 100Hz

Table 16b. Rx HP -3dB Corner Frequency Adjustment

INPUT CONDITIONS

A3:A0 = 1000, D8 A3:A0 = 1000, D10 RXENA RXHP

RSSI OUTPUT

0 0 0 X No Signal

0 0 1 0 No Signal

0 0 1 1 RSSI

0 1 0 X No Signal

0 1 1 X RSSI

1 X X X Temperature Sensor

Table 16c. RSSI Pin Truth Table

DATA BIT

DESCRIPTION

D13 0

D12 0

D11 0

Set to 0

D10 0

Enable Tx VGA Gain Programming Serially. 0: Tx VGA gain programmed with external digital inputs (B6:B1); 1: Tx VGA gain programmed with data bits in the Tx gain register (D5:D0).

D9 1

D8 0

PA Driver Linearity. D9:D8 = 00: 50% current (minimum linearity); 01: 63% current; 10: 78% current; 11: 100% current (maximum linearity).

D7 0

D6 0

Tx VGA Linearity. D7:D6 = 00: 50% current (minimum linearity); 01: 63% current; 10: 78% current; 11: 100% current (maximum linearity).

D5 0

D4 0

Set to 0

D3 0

D2 0

Tx Upconverter Linearity. D3:D2 = 00: 50% current (minimum linearity); 01: 63% current; 10: 78% current; 11: 100% current (maximum linearity).

D1 0

D0 0

Tx Baseband Gain. D1:D0 = 00: max baseband gain - 5dB; 01: max baseband gain - 3dB; 10: max baseband gain - 1.5dB; 11: max baseband gain.

Table 17. Tx Linearity/Baseband Gain Register (A3:A0 = 1001)

DEFAULT

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

______________________________________________________________________________________ 37

PA Bias DAC Register Definition (A3:A0 = 1010)

This register controls the output current of the DAC, which biases the external PA (see Table 18).

Rx Gain Register Definition (A3:A0 = 1011)

This register sets the Rx baseband and RF gain when A3:A0 = 1000, D12 = 1 (see Table 19).

Tx VGA Gain Register Definition (A3:A0 = 1100)

This register sets the Tx VGA gain when A3:A0 = 1001, D10 = 1 (see Table 20).

Applications Information

MIMO Applications

The MAX2828/MAX2829 support multiple input multiple output (MIMO) applications where multiple transceivers are used in parallel. A special requirement for this application is that all receivers must maintain a constant relative local oscillator phase, and that they continue to do so after any receive-transmit-receive mode switching. The same requirement holds for the transmitters—they should all maintain a constant relative phase, and continue to do so after any transmit-receive-transmit mode switching. This feature is enabled in the MAX2828/MAX2829 by programming A3:A0 = 0010, D13 = 1 and A3:A0 = 0101, D13 = 1. The constant relative phases of the multiple transceivers are maintained in the transmit, receive, and standby modes of operation, as long as they are all using a common external reference frequency source (crystal oscillator).

DATA BIT

DESCRIPTION

D13 0

D12 0

D11 0

D10 0

Set to 0

D9 1

D8 1

D7 1

D6 1

Sets PA bias DAC turn-on delay after TXENA is set high and A3:A0 = 0010, D10 = 1, in steps of 0.5µs. D9:D6 = 0001 corresponds to 0µs and 1111 corresponds to 7µs.

D5 0

D4 0

D3 0

D2 0

D1 0

D0 0

Sets PA bias DAC output current in steps of 5µA. D5:D0 = 000000 corresponds to 0µA and 111111 corresponds to 315µA.

Table 18. PA Bias DAC Register (A3:A0 = 1010)

DATA BIT

DESCRIPTION

D13 0

D12 0

D11 0

D10 0

D9 0

D8 0

D7 0

Not Used. For faster Rx gain setting, only D6:D0 need to be programmed.

D6 1

D5 1

Rx LNA Gain Control

D4 1

D3 1

D2 1

D1 1

D0 1

Rx VGA Gain Control

Rx baseband and RF gain-control bits. D6 maps to digital input pin B7 and D0 maps to digital input pin B1. D6:D0 = 0000000 corresponds to minimum gain.

Table 19. Rx Gain Register (A3:A0 = 1011)

DATA BIT

DESCRIPTION

D13 0

D12 0

D11 0

D10 0

D9 0

D8 0

D7 0

D6 0

Not Used. For faster Tx VGA gain setting, only D5:D0 need to be programmed.

D5 0

D4 0

D3 0

D2 0

D1 0

D0 0

Tx VGA Gain Control. D5 maps to digital input pin B6 and D0 maps to digital input pin B1. D5:D0 = 000000 corresponds to minimum gain.

Table 20. Tx VGA Gain Register (A3:A0 = 1100)

DEFAULT

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g World-Band Transceiver ICs

38 ______________________________________________________________________________________

RXRFL

TXRFL+

TXRFL-

GND

RXRFH

GND

TXRFH+

GND

VCCV

TXRFH-

TXENA

PABIAS

VCCV

TXBBI+

TXBBI-

TXBBQ+

TXBBQ-

BIAS

REF

GND

DIN

SCLK

RXENA

RXHP

RSSI

BYPASS

GND

CPOUT

GND

ROSC

RXBBI+

RXBBI-

RXBBQ+

RXBBQ-

15 16 17 18 19 201421 22 23 24 25 26 27 28

55 54 53 52 51 50 49 48 47 46 45 44 4356

TUNE

MAX2829

SHDN

TOP VIEW

Pin Configurations (continued)

Rx Gain Control

The receiver gain can be set either by the digital input pins B1 through B7 or by the internal Rx gain register. The gain-control characteristic is shown in the Typical Operating Characteristics.

RSSI

The RSSI output can be configured for two output voltage ranges: 0.5V to 2V and 0.5V to 2.5V (see Table 16a). The RSSI output is unaffected by the Rx VGA gain setting. They are capable of driving loads up to 10kΩ || 5pF.

Tx VGA Gain Control

The Tx gain can be set either by digital input pins B1 through B6 or by the internal Tx VGA gain register. The linearity of the Tx blocks can also be adjusted (Table 17). The Tx VGA gain-control characteristic is shown in the Typical Operating Characteristics.

Loop Filter

The loop-filter topology and component values can be found in the MAX2828/MAX2829 evaluation kit data sheet. A 150kHz loop bandwidth is recommended to ensure that the loop settles fast enough during Tx/Rx turnaround times.

Chip Information

TRANSISTOR COUNT: 42,998

PROCESS: BiCMOS

MAX2828/MAX2829

Single-/Dual-Band 802.11a/b/g

World-Band Transceiver ICs

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 39

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages

56L THIN QFN.EPS

MAXIM MAX2828, MAX2829 User Manual

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Frequently Asked Questions

User Manual