MAXIM MAX2831, MAX2832 Technical data

General Description

The MAX2831/MAX2832 direct conversion, zero-IF, RF
transceivers are designed specifically for 2.4GHz to

2.5GHz 802.11g/b WLAN applications. The MAX2831
completely integrates all circuitry required to implement
the RF transceiver function, providing an RF power
amplifier (PA), RF-to-baseband receive path, baseband­to-RF transmit path, VCO, frequency synthesizer, crystal
oscillator, and baseband/control interface. The MAX2832
integrates the same functional blocks except for the PA.
Both devices include a fast-settling sigma-delta RF syn­thesizer with smaller than 20Hz frequency steps and a
digitally tuned crystal oscillator allowing use of a low-cost
crystal. The devices also integrate on-chip DC-offset
cancellation and I/Q errors and carrier leakage-detection
circuits. Only an RF bandpass filter (BPF), crystal, RF
switch, and a small number of passive components are
needed to form a complete 802.11g/b WLAN RF front­end solution.

The MAX2831/MAX2832 completely eliminate the need
for an external SAW filter by implementing on-chip mono­lithic filters for both the receiver and transmitter. The
baseband filters are optimized to meet the IEEE 802.11g
standard and proprietary turbo modes up to 40MHz
channel bandwidth. These devices are suitable for the full
range of 802.11g OFDM data rates (6Mbps to 54Mbps)
and 802.11b QPSK and CCK data rates (1Mbps to
11Mbps). The ICs are available in a small, 48-pin TQFN
package measuring only 7mm x 7mm x 0.8mm.

Applications

Wi-Fi, PDA, VOIP, and Cellular Handsets

Wireless Speakers and Headphones

General 2.4GHz ISM Radios

Features

♦ 2.4GHz to 2.5GHz ISM Band Operation

♦ IEEE 802.11g/b Compatible (54Mbps OFDM and

11Mbps CCK)

♦ Complete RF Transceiver, PA, and Crystal

Oscillator (MAX2831)

Best-in-Class Transceiver Performance
62mA Receiver Current

2.6dB Rx Noise Figure

-76dBm Rx Sensitivity (54Mbps OFDM)
No I/Q Calibration Required

0.1dB/0.35° Rx I/Q Gain/Phase Imbalance
33dB RF and 62dB Baseband Gain Control

Range
60dB Range Analog RSSI per RF Gain Setting
Fast Rx I/Q DC-Offset Settling
Programmable Baseband Lowpass Filter
20-Bit Sigma-Delta Fractional-N PLL with

< 20Hz Step Size
Digitally Tuned Crystal Oscillator
+18.5dBm Transmit Power (5.6% EVM with

54Mbps OFDM)
31dB Tx Gain Control Range
Integrated Power Detector (MAX2831)
Serial or Parallel Gain-Control Interface
> 40dB Tx Sideband Suppression without

Calibration
Tx/Rx I/Q Error Detection

♦ Transceiver Operates from +2.7V to +3.6V

♦ PA Operates from +2.7V to +4.2V (MAX2831)

♦ Low-Power Shutdown Mode

♦ Small 48-Pin TQFN Package

(7mm x 7mm x 0.8mm)

MAX2831/MAX2832

2.4GHz to 2.5GHz 802.11g/b

RF Transceivers with Integrated PA

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-0363; Rev 2; 3/11

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.

Pin Configuration appears at end of data sheet.

EVALUATION KIT

AVAILABLE

*EP = Exposed pad.

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

PART TEMP RANGE PIN-PACKAGE

M A X2 8 3 1 E TM + T- 40°C to + 85°C 48 TQFN- EP*

M A X2 8 3 2 E TM + T- 40°C to + 85°C 48 TQFN- EP*

MAX2831/MAX2832

2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(MAX2831 EV kit: V

CC_

= 2.7V to 3.6V, V

CCPA

= V

CCTXPA

= 2.7V to 4.2V, TA= -40°C to +85°C, Rx set to the maximum gain. CS =
high, RXHP = SCLK = DIN = low, RSSI and clock output buffer are off, no signal at RF inputs, all RF inputs and outputs terminated
into 50Ω, receiver baseband outputs are open. 100mV

RMS

differential I and Q signals (54Mbps IEEE 802.11g OFDM) applied to I/Q

baseband inputs of transmitter in transmit mode, f

REF

= 40MHz, and registers set to recommended settings and corresponding test

mode, unless otherwise noted. Typical values are at V

CC

= 2.8V, V

CCPA

= 3.3V, and TA= +25°C, LO frequency = 2.437GHz, unless
otherwise noted. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB, balun,
and SMA connectors.) (Note 1)

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.

V

CCTXPA

, V

CCPA

and TXRF_ to GND ....................-0.3V to +4.5V

V

CCLNA

, V

CCTXMX

, V

CCPLL

, V

CCCP

, V

CCXTAL

, V

CCVCO

,

V

CCRXVGA

, V

CCRXFL

, and V

CCRXMX

_ to GND....-0.3V to +3.9V

B6, B7, B3, B2, SHDN, B5, CS, SCLK, DIN, B1, TUNE, B4,

TXBBI_, TXBBQ_, RXHP, RXTX, RXBBI_, RXBBQ_, RSSI,
BYPASS, CPOUT, LD, CLOCKOUT, XTAL, CTUNE, RXRF_ to

GND .......................................-0.3V to (Operating V

CC

+ 0.3V)

RXBBI_, RXBBQ_, RSSI, BYPASS, CPOUT, LD, CLOCKOUT

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

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

Continuous Power Dissipation (T

A

= +70°C)

48-Pin TQFN (derates 27.8mW/°C above +70°C) ..........2.22W

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

Soldering Temperature (reflow) .......................................+260°C

CAUTION! ESD SENSITIVE DEVICE

PARAMETERS CONDITIONS MIN TYP MAX UNITS

V

Supply Voltage

Supply Current

Rx I/Q Output Common-Mode
Voltage

Rx I/Q Output Common-Mode
Voltage Variation

Tx Baseband Input Common­Mode Voltage Operating Range

Tx Baseband Input Bias Current Source current 22 µA

CC_

V

CCPA

S hutd own m od e,
B7: B1 = 0000000,
r efer ence osci ll ator not
ap pl i ed

Standby mode

Rx mode

Tx mode, TA = +25°C,
V

CC

3.3V, (Note 2)

Rx calibration mode TA = +25°C 101

Tx calibration mode T

T

A

TA = -40°C (relative to TA = +25°C) -17

T

= +85°C (relative to TA = +25°C) 15

A

DC-coupled 0.9 1.3 V

= 2.8V, V

= +25°C at default common-mode setting 0.98 1.2 1.33 V

, V

CCTXPA

CCPA

T

= +25°C 20 µA

A

TA = +25°C 28 35

= -40°C to +85°C 35

T

A

TA = +25°C 62 78

= -40°C to +85°C 82

T

A

MAX2831, transmit section 82 104

M AX 2831, P A, P

=

MAX2832 86

= +25°C 78

A

2.7 3.6

2.7 4.2

= + 18.2d Bm 209 258

OU T

V

mA

mV

MAX2831/MAX2832

2.4GHz to 2.5GHz 802.11g/b

RF Transceivers with Integrated PA

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(MAX2831 EV kit: V

CC_

= 2.7V to 3.6V, V

CCPA

= V

CCTXPA

= 2.7V to 4.2V, TA= -40°C to +85°C, Rx set to the maximum gain. CS =
high, RXHP = SCLK = DIN = low, RSSI and clock output buffer are off, no signal at RF inputs, all RF inputs and outputs terminated
into 50Ω, receiver baseband outputs are open. 100mV

RMS

differential I and Q signals (54Mbps IEEE 802.11g OFDM) applied to I/Q

baseband inputs of transmitter in transmit mode, f

REF

= 40MHz, and registers set to recommended settings and corresponding test

mode, unless otherwise noted. Typical values are at V

CC

= 2.8V, V

CCPA

= 3.3V, and TA= +25°C, LO frequency = 2.437GHz, unless
otherwise noted. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB, balun,
and SMA connectors.) (Note 1)

AC ELECTRICAL CHARACTERISTICS—Rx Mode

(MAX2831 EV kit: V

CC_

= 2.8V, V

CCPA

= V

CCTXPA

= 3.3V, TA=+25°C, fRF= 2.439GHz, fLO= 2.437GHz; receiver baseband I/Q out-

puts at 112 mV

RMS

(-19dBV), f

REF

= 40MHz, SHDN = CS = high, RXTX = SCLK = DIN = low, with power matching for the differential

RF pins using the typical applications and registers set to default settings and corresponding test mode, unless otherwise noted.
Unmodulated single-tone RF input signal is used with specifications which normally apply over the entire operating conditions, unless
otherwise indicated. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB,
balun, and SMA connectors.) (Note 1)

PARAMETERS CONDITIONS MIN TYP MAX UNITS

LOGIC INPUTS: SHDN, RXTX, SCLK, DIN, CS, B7:B1, RXHP

Digital Input-Voltage High, V

Digital Input-Voltage Low, V

Digital Input-Current High, I

Digital Input-Current Low, I

LOGIC OUTPUTS: LD, CLOCKOUT

Digital Output-Voltage High, V

Digital Output-Voltage Low, V

IH

IL

IH

IL

Sourcing 100µA

OH

Sinking 100µA 0.4 V

OL

VCC -

0.4

-1 +1 µA

-1 +1 µA

V

-

CC

0.4

V

0.4 V

V

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

RF Input Frequency Range 2.4 2.5 GHz

RF Input Return Loss

Total Voltage Gain

RF Gain Steps (Note 3)

RF Gain-Change Settling Time

PARAMETER CONDITIONS MIN TYP MAX UNITS

High RF gain 18

Mid RF gain 11

Low RF gain 14

Maximum gain, B7:B1 =
1111111

Minimum gain, B7:B1 =
0000000

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

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

Gain change from high gain to medium gain, high gain to
low, or medium gain to low gain; gain settling to within
±2dB of steady state; RXHP = 1

TA = +25°C 86 98

= -40°C to +85°C 83

T

A

T

= +25°C 3 8

A

-16

-33

0.2 µs

dB

dB

dB

MAX2831/MAX2832

2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—Rx Mode (continued)

(MAX2831 EV kit: V

CC_

= 2.8V, V

CCPA

= V

CCTXPA

= 3.3V, TA=+25°C, fRF= 2.439GHz, fLO= 2.437GHz; receiver baseband I/Q out-

puts at 112 mV

RMS

(-19dBV), f

REF

= 40MHz, SHDN = CS = high, RXTX = SCLK = DIN = low, with power matching for the differential

RF pins using the typical applications and registers set to default settings and corresponding test mode, unless otherwise noted.
Unmodulated single-tone RF input signal is used with specifications which normally apply over the entire operating conditions, unless
otherwise indicated. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB,
balun, and SMA connectors.) (Note 1)

Baseband Gain Range

DSB Noise Figure

In-Band Compression Point
Based on EVM

PARAMETER CONDITIONS MIN TYP MAX UNITS

In-Band Output P-1dB Voltage gain = 90dB, with B7:B6 = 11 2.5 V

Out-of-Band Input IP3 (Note 4)

I/Q Phase Error 1σ variation (without calibration) ±0.35 D eg r ees

I/Q Gain Imbalance 1σ variation (without calibration) ±0.1 dB

RX I/Q Output Load Impedance
(R || C)

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

Baseband VGA Settling Time

I/Q Output DC Step when RXHP
Transitions from 1 to 0 in
Presence of 802.11g Short
Sequence

I/Q Output DC Droop

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

Spurious Signal Emissions from
LNA input

RECEIVER BASEBAND FILTERS

Gain Ripple in Passband 10kHz to 8.5MHz at baseband ±1.3 DB

G r oup - D el ay Ri p p l e i n P assb and 10kHz to 8.5MHz at baseband ±45 ns

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

Voltage gain = maximum with B7:B6 = 11 2.6

Voltage gain = 50dB with B7:B6 = 11 3.2

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

Voltage gain = 15dB with B7:B6 = 0X 34

-19dBV
output EVM degrades to
9%

B7:B6 = 11 -12

B7:B6 = 10 -4

B7:B6 = 0X 24

Minimum differential resistance 10 kΩ

Maximum differential capacitance 10 pF

For receiver gain, B7:B1 = 1101111 (Note 5) 0.5 dB

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

After switching RXHP to logic 0 from initial logic 1, during
ideal short sequence data at -55dBm input in AWGN
channel, for -19dBV output; normalized to RMS signal on
I and Q outputs; transition point varied from 0 to 0.8µs in
steps of 0.1µs

After switching RXHP to 0, D13:D12, Register 7
(A3:A0 = 0111)

RF = 1GHz to 26.5GHz -51 dBm

55 62 67 dB

baseband

RMS

B7:B6 = 11 -41

B7:B6 = 10 -24

B7:B6 = 0X -6

0.1 µs

-5 dBc

±1 V/s

dB

dBm

P-P

dBm

P-P

P-P

MAX2831/MAX2832

2.4GHz to 2.5GHz 802.11g/b

RF Transceivers with Integrated PA

_______________________________________________________________________________________ 5

AC ELECTRICAL CHARACTERISTICS—Rx Mode (continued)

(MAX2831 EV kit: V

CC_

= 2.8V, V

CCPA

= V

CCTXPA

= 3.3V, TA=+25°C, fRF= 2.439GHz, fLO= 2.437GHz; receiver baseband I/Q out-

puts at 112 mV

RMS

(-19dBV), f

REF

= 40MHz, SHDN = CS = high, RXTX = SCLK = DIN = low, with power matching for the differential

RF pins using the typical applications and registers set to default settings and corresponding test mode, unless otherwise noted.
Unmodulated single-tone RF input signal is used with specifications which normally apply over the entire operating conditions, unless
otherwise indicated. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB,
balun, and SMA connectors.) (Note 1)

Baseband Filter Rejection
(Nominal Mode)

RSSI

RSSI Minimum Output Voltage R

RSSI Maximum Output Voltage R

RSSI Slope 30 mV/dB

RSSI Output Settling Time

PARAMETER CONDITIONS MIN TYP MAX UNITS

At 8.5MHz 3.2

At 15MHz 27

At 20MHz 50

At > 40MHz 80

LOAD

LOAD

To within 3dB of steady
state

≥ 10kΩ || 5pF 0.4 V

≥ 10kΩ || 5pF 2.4 V

+32dB signal step 200

-32dB signal step 600

dB

ns

MAX2831/MAX2832

2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA

6 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—Tx Mode

(MAX2831 EV kit: V

CC_

= 2.8V, V

CCPA

= V

CCTXPA

= 3.3V, TA= +25°C, fRF= 2.439GHz , fLO= 2.437GHz. f

REF

= 40MHz, SHDN =

RXTX = CS = high, and SCLK = DIN = low, with power matching for the differential RF pins using the typical applications circuit.
100mV

RMS

sine and cosine signal (or 100mV

RMS

54Mbps IEEE 802.11g I/Q signals wherever OFDM is mentioned) applied to base­band I/Q inputs of transmitter (differential DC-coupled). Registers set to recommend settings and corresponding test mode, unless
otherwise noted. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB, balun,
and SMA connectors.) (Note 1)

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

RF Output Frequency Range 2.4 2.5 GHz

Output Power

PARAMETER CONDITIONS MIN TYP MAX UNITS

MAX2831

Output power adjusted

54Mbps 802.11g
OFDM signal

802.11b signal,
141mV
IEEE802.11b I/Q
signals

RMS

,

to meet 5.6% EVM,
and spectral mask

B6:B1 = 000000 -7.5

Output power adjusted
to meet spectral mask

18.5

21

dBm

MAX2832

U nw anted S i d eb and S up p r essi on Without I/Q calibration, B6:B1 = 100001 -42 dBc

Carrier Leakage at Center
Frequency of Channel

Transmitter Spurious Signal
Emissions (MAX2831)

Transmitter Spurious Signal
Emissions (MAX2832)

Without DC offset correction -30 dBc

B6:B1 = 111000,
OFDM signal

B6:B1 = 111111,
OFDM signal

-3dB VGA back off -5.3

B6:B1 = 000000 -31.5

1/3 x f

LO

< 1GHz -36

> 1GHz -47

2/3 x f

LO

4/3 x f

LO

5/3 x f

LO

8/3 x f

LO

2 x f

LO

3 x f

LO

1/3 x f

LO

< 1GHz -65

> 1GHz -72

2/3 x f

LO

4/3 x f

LO

5/3 x f

LO

8/3 x f

LO

2 x f

LO

3 x f

LO

-67

-64

-42

-65

-51

-33

-54

-78

-78

-46

-72

-46

-60

-75

dBm/

MHz

dBm/

MHz

MAX2831/MAX2832

2.4GHz to 2.5GHz 802.11g/b

RF Transceivers with Integrated PA

_______________________________________________________________________________________ 7

AC ELECTRICAL CHARACTERISTICS—Tx Mode (continued)

(MAX2831 EV kit: V

CC_

= 2.8V, V

CCPA

= V

CCTXPA

= 3.3V, TA= +25°C, fRF= 2.439GHz , fLO= 2.437GHz. f

REF

= 40MHz, SHDN =

RXTX = CS = high, and SCLK = DIN = low, with power matching for the differential RF pins using the typical applications circuit.
100mV

RMS

sine and cosine signal (or 100mV

RMS

54Mbps IEEE 802.11g I/Q signals wherever OFDM is mentioned) applied to base­band I/Q inputs of transmitter (differential DC-coupled). Registers set to recommend settings and corresponding test mode, unless
otherwise noted. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB, balun,
and SMA connectors.) (Note 1)

RF Output Return Loss

Tx I/Q Input Load Impedance
(R || C)

Baseband -3dB Corner
Frequency

Baseband Filter Rejection At 30MHz, in nominal mode 62 dB

Minimum Power Detector Output
Voltage

Maximum Power Detector Output
Voltage

RF P ow er D etector Resp onse Ti m e 0.3 µs

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

LO Leakage and Sideband
Detector Output

Amplifier Gain Range D12:D11 = 00 to D12:D11 = 11, A3:A0 = 0110 30 dB

Lower -3dB Corner Frequency 1 MHz

PARAMETER CONDITIONS MIN TYP MAX UNITS

O ff- chi p b al un + m atch, si ng l e­end ed

Minimum differential resistance 20 kΩ

Maximum differential capacitance 0.7 pF

D1:D0 = 01, Register 8
(A3:A0 = 1000)

Short sequence transmitter power = +9dBm 0.3 V

Short sequence transmitter power = +19dBm 1.2 V

Calibration register,
D12:D11 = 00,
A3:A0 = 0110

MAX2831 -20

MAX2832 -10

Nominal mode 11 MHz

Output at 1 x f
(for LO leakage = -29dBc),
f

= 2MHz, 100mV

TONE

Output at 2 x f
(for LO leakage = -240dBc),
f

= 2MHz, 100mV

TONE

TONE

RMS

TONE

RMS

-34

-44

d BV

dB

RM S

MAX2831/MAX2832

2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA

8 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—Frequency Synthesis

(MAX2831 EV kit: V

CC_

= 2.7V, V

CCPA

= V

CCTXPA

= 3.3V, TA= +25°C, fLO= 2.437GHz, f

REF

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

DIN = low, PLL loop bandwidth = 150kHz, and T

A

= +25°C, unless otherwise noted.) (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNITS

FREQUENCY SYNTHESIZER

RF Channel Center Frequency 2.4 2.5 GHz

Channel Center Frequency
Programming Minimum Step Size

Charge-Pump Comparison
Frequency

Reference Frequency Range 20 44 MHz

Reference Frequency Input
Levels

Reference Frequency Input
Impedance (R || C)

Closed-Loop Phase Noise

Closed-Loop Integrated Phase
Noise

Charge-Pump Output Current 1mA

Reference Spurs 20MHz offset -55 dBc

VCO Frequency Error

VOLTAGE-CONTROLLED OSCILLATOR

Pushing Referred to 2400MHz LO, VCC varies by 0.3V 210 kHz

VCO Tuning Voltage Range 0.5 2.2 V

LO Tuning Gain

AC-coupled to XTAL pin 800 mV

Resistance (XTAL) 5 kΩ

Capacitance (XTAL) 4 pF

f

= 1kHz -86

OFFSET

f

= 10kHz -94

OFFSET

f

= 100kHz -94

OFFSET

f

= 1MHz -110

OFFSET

= 10MHz -120

f

OFFSET

RMS phase jitter; integrate from 10kHz to 10MHz offset 0.9 D eg r ees

M easur ed fr om Tx- Rx or Rx- Tx
tr ansi ti on

V

= 0.5V 103

TUNE

V

= 2.2V 86

TUNE

3µs to 9µs 50

> 9µs 1

20 Hz

20 MHz

P-P

dBc/Hz

kHz

MHz/V

MAX2831/MAX2832

2.4GHz to 2.5GHz 802.11g/b

RF Transceivers with Integrated PA

_______________________________________________________________________________________ 9

AC ELECTRICAL CHARACTERISTICS—Miscellaneous Blocks

(MAX2831 EV kit: V

CC_

= 2.8V, V

CCPA

= V

CCTXPA

= 3.3V, fLO= 2.437GHZ, f

REF

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

and T

A

= +25°C, unless otherwise noted.) (Note 1)

AC ELECTRICAL CHARACTERISTICS—Timing

(MAX2831 EV kit: V

CC_

= 2.8V, V

CCPA

= V

CCTXPA

= 3.3V, TA=+25°C, fLO= 2.437GHz, f

REF

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

DIN = low, PLL loop bandwidth = 150kHz, and T

A

= +25°C, unless otherwise noted.) (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNITS

CRYSTAL OSCILLATOR

On-Chip Tuning Capacitance
Range

On-Chip Tuning Capacitance
Step Size

ON-CHIP TEMPERATURE SENSOR

M axi m um cap aci tance, A3:A0 = 1110, D 6:D 0 = 1111111 15.4

M i ni m um cap aci tance, A3:A0 = 1110, D 6:D 0 = 0000000 0.5

TA = -40°C 0.35

TA = +25°C 1Output Voltage A3:A0 = 1000, D 9:D 8 = 01

T

= +85°C 1.6

A

0.12 pF

PARAMETER CONDITIONS MIN TYP MAX UNITS

SYSTEM TIMING (See Figure 3)

Turn-On Time

Crystal Oscillator Turn-On Time 90% of final output amplitude level 1 ms

Channel Switching Time Loop BW = 150kHz, fRF = 2.5GHz to 2.4GHz 25 µs

From SHDN rising edge to LO settled within 1kHz using
external reference frequency input

60 µs

pF

V

Rx/Tx Turnaround Time

Tx Turn-On Time (from Standby
Mode)

Tx Turn-Off Time (from Standby
Mode)

Rx Turn-On Time (from Standby
Mode)

Rx Turn-Off Time (from Standby
Mode)

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

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

From Tx-enable inactive rising edge 1 µs

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

From Rx-enable inactive rising edge 0.1 µs

Rx to Tx 2

µs

Tx to Rx, RXHP = 1 2

1.5 µs

1.9 µs

MAX2831/MAX2832

2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA

10 ______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—Timing (continued)

(MAX2831 EV kit: V

CC_

= 2.8V, V

CCPA

= V

CCTXPA

= 3.3V, TA=+25°C, fLO= 2.437GHz, f

REF

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

DIN = low, PLL loop bandwidth = 150kHz, and T

A

= +25°C, unless otherwise noted.) (Note 1)

Note 1: Min and max limits are guaranteed by test at TA= +25°C and +85°C and guaranteed by design and characterization at

T

A

= -40°C. The power-on register settings are not production tested. Recommended register setting must be loaded after

VCCis supplied.

Note 2: Guaranteed by design and characterization.
Note 3: The nominal part-to-part variation of the RF gain step is ±1dB.
Note 4: Two tones at +25MHz and +48MHz offset with -35dBm/tone. Measure IM3 at 2MHz.
Note 5: Tx I/Q inputs = 100mV

RMS

.

3-WIRE SERIAL-INTERFACE TIMING (See Figure 2)

SCLK Rising Edge to CS Falling
Edge Wait Time, t

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

DIN to SCLK Setup Time, t

DIN to SCLK Hold Time, t

SCLK Pulse-Width High, t

SCLK Pulse-Width Low, t

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

CS High Pulse Width, t

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

Clock Frequency, f

Rise Time, t

Fall Time, t

PARAMETER CONDITIONS MIN TYP MAX UNITS

CS1

R

F

CSO

CLK

CSS

DS

DH

CH

CL

CSH

CSW

6ns

6ns

6ns

6ns

6ns

6ns

6ns

20 ns

6ns

20 MHz

2ns

2ns

MAX2831/MAX2832

2.4GHz to 2.5GHz 802.11g/b

RF Transceivers with Integrated PA

______________________________________________________________________________________ 11

Typical Operating Characteristics

(MAX2831 EV kit, V

CC_

= 2.8V, V

CCPA

= V

CCTXPA

= 3.3V, TA= +25°C, fLO= 2.437GHz, f

REF

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

SCLK = DIN = low.)

Rx ICC vs. V

67

66

65

64

(mA)

CC

I

63

62

61

2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6

TA = -40°C

TA = +85°C

V

CC

Rx IN-BAND OUTPUT P-1dB vs. GAIN

0

-1

)

-2

RMS

-3

LNA MEDIUM/LOW-

-4

GAIN SWITCH POINT

-5

OUTPUT P-1dB (dBV

-6

-7
15 25 35 45 55 75 85 95

LNA MEDIUM/HIGH­GAIN SWITCH POINT

GAIN (dB)

(V)

CC

TA = +25°C

NOISE FIGURE

vs. BASEBAND GAIN SETTINGS

45

MAX2831/32 toc01

NF (dB)

MAX2831/32 toc04

EVM (%)

40

35

30

25

20

15

10

5

0

02468101214161820222426283032

BASEBAND GAIN SETTINGS

22

LNA = HIGH GAIN

20

18

LNA = MEDIUM GAIN

16

14

12

10

8

6

4

2

0

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

LNA = LOW GAIN

LNA = MEDIUM GAIN

LNA = HIGH GAIN

Rx EVM vs. P

P

(dBm)

IN

IN

LNA = LOW GAIN

Rx VOLTAGE GAIN

vs. BASEBAND GAIN SETTING

100

90

LNA = HIGH GAIN

80

MAX2831/32 toc02

70

60

50

GAIN (dB)

40

30

20

10

0

02468101214161820222426283032

BASEBAND GAIN SETTINGS

LNA = MEDIUM GAIN

LNA = LOW GAIN

Rx EVM vs. V

3.0
PIN = -50dBm

LNA = HIGH GAIN

2.5

MAX2831/32 toc05

2.0

1.5

EVM (%)

1.0

0.5

0

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

(dBV

OUT

RMS

MAX2831/32 toc03

OUT

MAX2831/32 toc06

)

OFDM EVM WITH OFDM JAMMER

vs. OFFSET FREQUENCY

15
14

PIN = -62dBm
13
12
11
10

9
8
7

EVM (%)

6
5
4
3
2
1
0

-65 -55 -45 -35 -25

f

OFFSET

f

OFFSET

= 25MHz

P

JAMMER

= 20MHz

f

OFFSET

(dBm)

= 40MHz

MAX2831/32 toc07

Rx EMISSION SPECTRUM, LNA INPUT

-40

-50

-60

-70
VCO LEAKAGE

-80

-90

dBM

-100

-110

-120

-130

-140
DC 26.5GHz

3x VCO

1.5 VCO LEAKAGE
2x VCO LEAKAGE

4x VCO

MAX2831/32 toc08

RBW = 300kHz
LNA = LOW GAIN

LNA INPUT RETURN LOSS

vs. RF FREQUENCY

-5
MID GAIN

-10

-15

-20
LOW GAIN

INPUT RETURN LOSS (dB)

-25

-30

2300 2350 2400 2450 2500 2550 2600

HIGH GAIN

RF FREQUENCY (MHz)

MAX2831/32 toc09