MAXIM MAX2837 Technical data

General Description

The MAX2837 direct-conversion zero-IF RF transceiver is designed specifically for 2.3GHz to 2.7GHz wireless broadband systems. The MAX2837 completely integrates all circuitry required to implement the RF transceiver function, providing RF-to-baseband receive path; and baseband-to-RF transmit path, VCO, frequency synthesizer, crystal oscillator, and baseband/control interface. The device includes a fast-settling sigmadelta RF synthesizer with smaller than 20Hz frequency steps and a crystal oscillator, which allows the use of a low-cost crystal in place of a TCXO. The transceiver IC also integrates circuits for on-chip DC offset cancellation, I/Q error, and carrier-leakage detection circuits. Only an RF bandpass filter (BPF), crystal, RF switch, PA, and a small number of passive components are needed to form a complete wireless broadband RF radio solution.

The MAX2837 completely eliminates the need for an external SAW filter by implementing on-chip monolithic filters for both the receiver and transmitter. The baseband filters along with the Rx and Tx signal paths are optimized to meet stringent noise figure and linearity specifications. The device supports up to 2048 FFT OFDM and implements programmable channel filters for 1.75MHz to 28MHz RF channel bandwidths. The transceiver requires only 2µs Tx-Rx switching time, which includes frequency transient settling. The IC is available in a small, 48-pin thin QFN package measuring only 6mm x 6mm x 0.8mm.

Applications

802.16-2004 Fixed WiMAX

Korea Wibro and 802.16e Mobile WiMAX

Dual Mode

WiMAX/802.11b/g Wi-Fi

Proprietary Wireless Broadband Systems

4G/LTE Systems

Features

♦ 2.3GHz to 2.7GHz Wideband Operation

♦ Complete RF Transceiver, PA Driver, and

Crystal Oscillator

0dBm Linear OFDM Transmit Power

-70dBr Tx Spectral Emission Mask

2.3dB Rx Noise Figure

Tx/Rx I/Q Error and LO Leakage Detection

Monolithic Low-Noise VCO with -39dBc

Integrated Phase Noise

Programmable Tx I/Q Lowpass

Anti-Aliasing Filter

Sigma-Delta Fractional-N PLL with

20Hz Step Size

45dB Tx Gain-Control Range

94dB Receive Gain-Control Range

60dB Analog RSSI Instantaneous

Dynamic Range

4-Wire SPI™ Digital Interface

I/Q Analog Baseband Interface

Digitally Tuned Crystal Oscillator

On-Chip Digital Temperature Sensor Read-Out

♦ +2.7V to +3.6V Transceiver Supply

♦ Low-Power Shutdown Current

♦ Small 48-Pin Thin QFN Package

(6mm x 6mm x 0.8mm)

MAX2837

2.3GHz to 2.7GHz Wireless Broadband RF Transceiver

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-0806; Rev 1; 11/08

For information on other Maxim products, visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE

PINPACKAGE

MAX2837ETM+TD

48 TQFN-EP*

EP = Exposed paddle.

Denotes a lead-free package.

Pin Configuration appears at end of data sheet.

Dual Mode is a trademark of Maxim Integrated Products, Inc.

SPI is a trademark of Motorola, Inc.

-40°C to +85°C

MAX2837

2.3GHz to 2.7GHz Wireless Broadband RF Transceiver

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(MAX2837 evaluation kit: V

CC_

= 2.7V to 3.6V, 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; 90mV

RMS

dif-

ferential I and Q signals applied to I, Q baseband inputs of transmitter in transmit mode, f

REF

= 40MHz, registers set to recommended

settings and corresponding test mode, T

= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= 2.8V, fLO= 2.5GHz,

and T

= +25°C, unless otherwise noted.) (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.

CCLNA

, V

CCTXMX

, V

CCTXPAD

, V

CCDIG

, V

CCCP

, V

CCXTAL

CCVCO

, V

CCRXVGA

, V

CCRXFL

and V

CCRXMX

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

B1–B7, TXRF_, CS, SCLK, DIN, DOUT, TXBBI_, TXBBQ_, RXHP,

RXBBI_, RXBBQ_, RSSI, ENABLE, BYPASS, CPOUT_, CLOCKOUT, XTAL1, XTAL2, RXRF_,RXENABLE, TXENABLE

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

+ 0.3V)

RXBBI_, RXBBQ_, RSSI, BYPASS, CPOUT_, DOUT, CLOCKOUT,

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

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

Continuous Power Dissipation (T

= +70°C)

48-Pin Thin QFN (derates 37mW/°C above +70°C).......2.96W

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

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

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

Lead Temperature (soldering, 10s) .................................+260°C

PARAMETER CONDITIONS

Supply Voltage V

CC_

2.7 3.6 V

Shutdown mode, TA = +25°C10µA

Standby mode 35 45

Rx mode 91 110

Tx mode, TA = +25°C

170

Rx calibration mode

160

Supply Current

Tx calibration mode

135

D9:D8 = 00 in A4:A0 = 00100

1.0

D9:D8 = 01 in A4:A0 = 00100 1.1

D9:D8 = 10 in A4:A0 = 00100 1.2

Rx I/Q Output Common-Mode Voltage

D9:D8 = 11 in A4:A0 = 00100

Tx Baseband Input CommonMode Voltage Operating Range

DC-coupled 0.5 1.2 V

Tx Baseband Input Bias Current Source current 10 20 µA

LOGIC INPUTS: ENABLE, TXENABLE, RXENABLE, SCLK, DIN, CS, B7:B1, RXHP

Digital Input-Voltage High, V

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

CAUTION! ESD SENSITIVE DEVICE

MIN TYP MAX UNITS

145

135

0.85

VCC -

110

1.35

1.20

MAX2837

2.3GHz to 2.7GHz Wireless Broadband RF Transceiver

_______________________________________________________________________________________ 3

PARAMETER CONDITIONS

LOGIC OUTPUTS: DOUT

Sourcing 100µA

0.4

Digital Output-Voltage Low, V

Sinking 100µA 0.4 V

DC ELECTRICAL CHARACTERISTICS (continued)

(MAX2837 evaluation kit: V

CC_

= 2.7V to 3.6V, 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; 90mV

RMS

dif-

ferential I and Q signals applied to I, Q baseband inputs of transmitter in transmit mode, f

REF

= 40MHz, registers set to recommended

settings and corresponding test mode, T

= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= 2.8V, fLO= 2.5GHz,

and T

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

AC ELECTRICAL CHARACTERISTICS—Rx MODE

(MAX2837 evaluation kit: VCC_ = 2.8V, fRF= 2.502GHz, fLO= 2.5GHz; receiver baseband I/Q outputs at 90mV

RMS

(-21dBV), f

REF

= 40MHz, ENABLE = RXENABLE = CS = high, TXENABLE = 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, T

= +25°C, unless otherwise noted.

Lowpass filter is set to 10MHz RF channel BW. Unmodulated single-tone RF input signal is used, unless otherwise indicated.) (Note 1)

PARAMETER CONDITIONS

UNITS

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

RF Input Frequency Range 2.3 2.7

GHz

Peak-to-Peak Gain Variation over RF Input Frequency Range

Tested at band edges and band center 0.8 dB

RF Input Return Loss All LNA gain settings 13 dB

M axi m um g ai n, B7:B1 = 0000000 90 99

Total Voltage Gain

M i ni m um g ai n, B7:B1 = 1111111 5 13

From max RF gain to max RF gain - 8dB 8

From max RF gain to max RF gain - 16dB 16

RF Gain Steps

From max RF gain to max RF gain - 32dB 32

Any RF or baseband gain change; gain settling to within ±1dB of steady state; RXHP = 1

0.2

Gain Change Settling Time

Any RF or baseband gain change; gain settling to within ±0.1dB of steady state; RXHP = 1

µs

Baseband Gain Range

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

= - 40°C to + 85°C

58 62 66 dB

Baseband Gain Minimum Step Size

2dB

Voltage gain ≥ 65dB with max RF gain (B7:B6 = 00) 2.3

Voltage gain = 50dB with max RF gain - 8dB (B7:B6 = 01)

5.5

Voltage gain = 45dB with max RF gain - 16dB (B7:B6 = 10)

DSB Noise Figure

Voltage gain = 15dB with max RF gain - 32dB (B7:B6 = 11)

Digital Output-Voltage High, V

MIN TYP MAX UNITS

MIN TYP MAX

TA = - 40°C to + 85°C

MAX2837

2.3GHz to 2.7GHz Wireless Broadband RF Transceiver

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued)

MAX2837 evaluation kit: VCC_ = 2.8V, fRF= 2.502GHz, fLO= 2.5GHz; receiver baseband I/Q outputs at 90mV

RMS

(-21dBV), f

REF

= 40MHz, ENABLE = RXENABLE = CS = high, TXENABLE = 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, T

= +25°C, unless otherwise noted.

Lowpass filter is set to 10MHz RF channel BW. Unmodulated single-tone RF input signal is used, unless otherwise indicated.) (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Max RF gain (B7:B6 = 00) -37

Max RF gain - 8dB (B7:B6 = 01) -29

Max RF gain - 16dB (B7:B6 = 10) -21

In-Band Input P-1dB

Max RF gain - 32dB (B7:B6 = 11) -4

dBm

Maximum Output Signal Level

Over passband frequenc y range; at any gain setting; 1dB compression point

2.5 V

P-P

Max RF gain (B7:B6 = 00), AGC set for -65dBm wanted signal

-11

Max RF gain - 8dB (B7:B6 = 01), AGC set for -55dBm wanted signal

-8

Max RF gain - 16dB (B7:B6 = 10), AGC set for -40dBm wanted signal

-6

Out-of-Band Input IP3 (Note 2)

Max RF gain - 32dB (B7:B6 = 11), AGC set for -30dBm wanted signal

+16

dBm

I/Q Phase Error 50kHz ba seband output; 1 variation 0.15 Degrees

I/Q Gain Imbalance 50kHz ba seband output; 1 variation 0.1 dB

Minimum differential resistance 10 k

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

Maximum differential capacitance 5 pF

I/Q Output DC Droop

After sw itching RXHP to 0; average over 1μ s after any gain change, or 2μs after receive enabled with 100Hz interval AC-coupl ing, 1 var iat ion

±1 mV/ms

I/Q Static DC Offset

No RF input signal; mea sure at 3μs after recei ve enable; RXHP = 1 for 0 to 2μ s and set to 0 after 2μs, 1 variation

±1 mV

Loopback Gain (for Receiver I/Q Calibration)

Transm itter I/Q input to receiver I/Q output; transmitter B6:B1 = 000011, receiver B5:B1 = 10100 programmed through SPI

-4.5 0 +4.5 dB

RECEIVER BASEBAND FILTERS

At 15MHz 57

At 20MHz 75

Baseband Filter Reject ion

At > 40MHz 90

RXHP = 1 (used before AGC completion) 650

D5:D4 = 00 0.1

D5:D4 = 01 1

D5:D4 = 10 30

Baseband Highpass Filter Cor ner Fr equen c y

RXHP = 0 (used after AGC completion) address A4:A0 = 01110

D5:D4 = 11 100

kHz

MAX2837

2.3GHz to 2.7GHz Wireless Broadband RF Transceiver

_______________________________________________________________________________________ 5

AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued)

MAX2837 evaluation kit: VCC_ = 2.8V, fRF= 2.502GHz, fLO= 2.5GHz; receiver baseband I/Q outputs at 90mV

RMS

(-21dBV), f

REF

= 40MHz, ENABLE = RXENABLE = CS = high, TXENABLE = 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, T

= +25°C, unless otherwise noted.

Lowpass filter is set to 10MHz RF channel BW. Unmodulated single-tone RF input signal is used, unless otherwise indicated.) (Note 1)

PARAMETER CONDITIONS

UNITS

A4:A0 = 00010 serial bits D7:D4 = 0000

A4:A0 = 00010 serial bits D7:D4 = 0001

A4:A0 = 00010 serial bits D7:D4 = 0010 3.5

A4:A0 = 00010 serial bits D7:D4 = 0011 5.0

A4:A0 = 00010 serial bits D7:D4 = 0100 5.5

A4:A0 = 00010 serial bits D7:D4 = 0101 6.0

A4:A0 = 00010 serial bits D7:D4 = 0110 7.0

A4:A0 = 00010 serial bits D7:D4 = 0111 8.0

A4:A0 = 00010 serial bits D7:D4 = 1000 9.0

A4:A0 = 00010 serial bits D7:D4 = 1001

A4:A0 = 00010 serial bits D7:D4 = 1010

A4:A0 = 00010 serial bits D7:D4 = 1011

A4:A0 = 00010 serial bits D7:D4 = 1100

A4:A0 = 00010 serial bits D7:D4 = 1101

A4:A0 = 00010 serial bits D7:D4 = 1110

RF Channel BW Supported by Baseband Filter

A4:A0 = 00010 serial bits D7:D4 = 1111

MHz

0 to 2.3MHz for BW = 5MHz 1.3

Baseband Gain Ripple

0 to 4.6MHz for BW = 10MHz 1.3

P-P

0 to 2.3MHz for BW = 5MHz 90

Baseband Group Delay Ripple

0 to 4.6MHz for BW = 10MHz 50

P-P

At 3.3MHz 7

Baseband Filter Rejection for 5MHz RF Channel BW

At > 21MHz 85

At 6.7MHz 7

Baseband Filter Rejection for 10MHz RF Channel BW

At > 41.6MHz 85

RSSI

RSSI Minimum Output Voltage R

LOAD

≥ 10kΩ 0.4 V

RSSI Maximum Output Voltage R

LOAD

≥ 10kΩ 2.2 V

RSSI Slope 30

mV/dB

+32dB signal step 200

RSSI Output Settling Time

To within 3dB of steady state

-32dB signal step 800

MIN TYP MAX

1.75

2.25

10.0

12.0

14.0

15.0

20.0

24.0

28.0

PARAMETER CONDITIONS MIN TYP MAX UNITS

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

RF Output Frequency Range 2.3 2.7 GHz

Peak-to-Peak Gain Variation over RF Band

Output optimally matched over 200MHz RF BW 2.5 dB

Total Voltage Gain Max gain; at unbalanced 50 balun output 12 dB

Maximum Output Power over Frequency for Any Given 200MHz Band

OFDM signal conforming to spectral emission mask and -36dB EVM after I/Q imbalance calibration by modem (Note 3)

0 dBm

RF Output Return Loss

Given 200MHz band in the 2.3GHz to 2.7GHz range, for which the matching has been optimized

8 dB

RF Gain Control Range 45 dB

Unwanted Sideband Suppression

Without calibration by modem, and excludes modem I/Q imbalance; P

OUT

= 0dBm

45 dBc

B1 1

B2 2

B3 4

B4 8

B5 16

RF Gain-Control Binary Weights

B6 16

Carrier Leakage

Relative to 0dBm output power; without calibration by modem

-35 dBc

Minimum differential resistance 100 k

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

Maximum differential capacitance 0.5 pF

0 to 2.3MHz 0.2

Baseband Frequency Response for 5MHz RF Channel BW

At > 25MHz 80

0 to 4.6MHz 0.2

Baseband Frequency Response for 10MHz RF Channel BW

At > 17MHz 80

0 to 2.3MHz (BW = 5MHz) 20

Baseband Group Delay Ripple

0 to 4.6MHz (BW = 10MHz) 12

MAX2837

2.3GHz to 2.7GHz Wireless Broadband RF Transceiver

6 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS—Tx MODE

(MAX2837 evaluation kit: V

CC_

= 2.8V, TA= +25°C, fRF= 2.502GHz, fLO= 2.5GHz; f

REF

= 40MHz, ENABLE = TXENABLE = CS = high,

and RXENABLE = SCLK = DIN = low, with power matching for the differential RF pins using the

Typical Operating Circuit

. Lowpass

fitler is set to 10MHz RF channel BW, 90mV

RMS

sine and cosine signal (or 90mV

RMS

64QAM 1024-FFT OFDMA FUSC I/Q signals

wherever OFDM is mentioned) applied to baseband I/Q inputs of transmitter (differential DC-coupled).) (Note 1)

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