MAXIM MAX2851 Technical data

19-5121; Rev 1; 3/10

EVALUATION KIT

AVAILABLE

5GHz, 5-Channel MIMO Receiver

General Description

The MAX2851 is a single-chip, 5-channel RF receiver IC
designed for 5GHz wireless HDMI™ applications. The
IC includes all circuitry required to implement the com­plete 5-channel MIMO RF receiver function and crystal
oscillator, providing a fully integrated receive path, VCO,
frequency synthesis, and baseband/control interface. It
includes a fast-settling sigma-delta RF fractional synthe­sizer with 76Hz frequency programming step size. The
IC also integrates on-chip I/Q amplitude and phase-error
calibration circuits. The receiver includes both an in­channel RSSI and also an RF RSSI.

On-chip monolithic filters are included for receiver I/Q
baseband signal channel selection, for supporting both
20MHz and 40MHz RF channels. The baseband filter­ing and Rx signal paths are optimized to meet stringent
WHDI requirements. The downconverter local oscillator
is coherent among all the receiver channels.

The reverse-link control channel uses an on-chip 5GHz
OFDM transmitter. It shares the RF synthesizer and LO
generation circuit with the MIMO receivers. Dynamic
on/off control of the external PA is implemented with
programmable precision voltage. An analog mux routes
external PA power-detect voltage to the RSSI pin.

The MIMO receiver chip is housed in a small 68-pin
TQFN leadless plastic package with exposed paddle.

Applications

5GHz Wireless HDMI (WHDI™)

5GHz FDD Backhaul and WiMAX™

5GHz MIMO Receiver Up to Five Spatial Streams

5GHz Beam Steering Receiver

Features

S 5GHz, 5x MIMO Downlink Receivers, Single-Uplink

IEEE 802.11a Transmitter

S 4900MHz to 5900MHz Frequency Range
S Coherent LO Among Receivers
S 4.5dB Rx Noise Figure
S 70dB Rx Gain Control Range with 2dB Step Size,

Digitally Controlled

S 60dB Dynamic Range Receiver RSSI
S RF Wideband Receiver RSSI
S Programmable 20MHz/40MHz Rx I/Q Lowpass

Channel Filters

S -5dBm Transmit Power (54Mbps OFDM)
S 31dB Tx Gain Control Range with 0.5dB Step Size,

Digitally Controlled

S Tx/Rx I/Q Error and LO Leakage Detection and

Adjustment

S Programmable 20MHz/40MHz Tx I/Q Lowpass

Anti-Aliasing Filter

S Analog Mux for PA Power Detect
S PA On/Off Control
S Sigma-Delta Fractional-N PLL with 76Hz

Resolution

S Monolithic Low-Noise VCO with -35dBc Integrated

Phase Noise

S 4-Wire SPIK
S I/Q Analog Baseband Interface
S Digital Tx/Rx Mode Control
S On-Chip Digital Temperature Sensor Readout
S Complete Baseband Interface
S Digital Tx/Rx Mode Control
S +2.7V to +3.6V Supply Voltage
S Small 68-Pin TQFN Package (10mm x 10mm)

Digital Interface

MAX2851

Ordering Information

PART TEMP RANGE PIN-PACKAGE

HDMI is a trademark of HDMI Licensing, LLC.
WHDI is a trademark of WHDI Special Interest Group.
WiMAX is a trademark of the WiMAX Forum.
SPI is a trademark of Motorola, Inc.

_______________________________________________________________ Maxim Integrated Products 1

MAX2851ITK+

+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed paddle.

Typical Operating Circuit appears at end of data sheet.

-25NC to +85NC

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

68 TQFN-EP*

5GHz, 5-Channel MIMO Receiver

ABSOLUTE MAXIMUM RATINGS

V

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

CC_

RF Inputs Max Current: RXRF1+, RXRF1-, RXRF2+,
RXRF2-, RXRF3+, RXRF3-, RXRF4+, RXRF4-,

RXRF5+, RXRF5- to GND ................................. -1mA to +1mA

RF Outputs: TXRF+, TXRF- to GND ..................... -0.3V to +3.9V

Analog Inputs: TXBBI+, TXBBI-, TXBBQ+, TXBBQ-, PA_DET,

XTAL, XTAL_CAP to GND ..................................-0.3V to +3.9V

Analog Outputs: RXBBI1+, RXBBI1-, RXBBQ1+, RXBBQ1-,

MAX2851

RXBBI2+, RXBBI2-, RXBBQ2+, RXBBQ2-, RXBBI3+, RXBBI3-,
RXBBQ3+, RXBBQ3-, RXBBI4+, RXBBI4-, RXBBQ4+,
RXBBQ4-, RXBBI5+, RXBBI5-, RXBBQ5+, RXBBQ5-, RSSI,
CLKOUT2, BYP_VCO, CPOUT+, CPOUT-, PA_BIAS to

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

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.

CAUTION! ESD SENSITIVE DEVICE

DC ELECTRICAL CHARACTERISTICS

(Operating conditions unless otherwise specified: V
mode, CS = high, SCLK = DIN = low, transmitter in maximum gain. Power matching and termination for the differential RF output
pins using the Typical Operating Circuit; 100mV
in transmit mode. Typical values measured at V
PA control pins open circuit, V

PARAMETER CONDITIONS MIN TYP MAX UNITS

Supply Voltage 2.7 3.6 V

Supply Current

Rx I/Q Output Common-Mode
Voltage

Tx Baseband Input Common­Mode Voltage Operating Range

Tx Baseband Input Bias Current Source current 10 20

CC_PA_BIAS

Shutdown mode

Clockout only mode
with load = 10pF at
CLKOUT pin

Standby mode 60
Transmit mode 183 212

Receive mode

Receive calibration
mode

Transmit calibration mode 256

CC

is disconnected.) (Note 1)

= 2.7V to 3.6V, T

CC

differential I and Q signals applied to I and Q baseband inputs of transmitters

RMS

= 2.85V, TA = +25NC, LO freq = 5.35GHz. Channel bandwidth is set to 40MHz.

T

A

XTAL oscillator, CLKOUT2 is off 3.7
XTAL oscillator, CLKOUT2 is on 4.6
TCXO input, CLKOUT2 is off 4.8 7.0
TCXO input, CLKOUT2 is on 6.1

One receiver is on 144 184
Five receivers are on 367 458
One receiver is on 248
Five receivers are on 435 517

Digital Inputs: ENABLE, CS, SCLK,

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

Digital Outputs: DOUT, CLKOUT to GND ............-0.3V to +3.9V

Short-Circuit Duration

Analog Outputs ................................................................. 10s

Digital Outputs ................................................................... 10s

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

RF Output Differential Load VSWR ........................................ 6:1

Continuous Power Dissipation (T

68-Pin TQFN (derate 29.4mW/NC above +70NC) .......2352mW

Operating Temperature Range .......................... -25NC to +85NC

Junction Temperature .....................................................+150NC

Storage Temperature Range ............................ -65NC to +160NC

Lead Temperature (soldering, 10s) ................................+300NC

Soldering Temperature (reflow) ......................................+260NC

= -25NC to +85NC, ENABLE set according to operating

A

= +25NC

= +85NC)

A

10

0.88 1.1 1.34 V

0.5 1.1 V

FA

mA

FA

2 ______________________________________________________________________________________

5GHz, 5-Channel MIMO Receiver

DC ELECTRICAL CHARACTERISTICS (continued)

(Operating conditions unless otherwise specified: V
mode, CS = high, SCLK = DIN = low, transmitter in maximum gain. Power matching and termination for the differential RF output
pins using the Typical Operating Circuit; 100mV
in transmit mode. Typical values measured at V
PA control pins open circuit, V

PARAMETER CONDITIONS MIN TYP MAX UNITS

LOGIC INPUTS: ENABLE, SCLK, DIN, CS

Digital Input-Voltage High, V

Digital Input-Voltage Low, V
Digital Input-Current High, I
Digital Input-Current Low, I

LOGIC OUTPUTS: DOUT, CLKOUT

Digital Output-Voltage High, V

Digital Output-Voltage Low, V

Digital Output Voltage in
Shutdown Mode

CC_PA_BIAS

IH

IL

IH

IL

OH

OL

(Note 2) 0.3 V

Sourcing 1mA

Sinking 1mA 0.4 V

Sinking 1mA V

CC

is disconnected.) (Note 1)

= 2.7V to 3.6V, T

CC

differential I and Q signals applied to I and Q baseband inputs of transmitters

RMS

= 2.85V, TA = +25NC, LO freq = 5.35GHz. Channel bandwidth is set to 40MHz.

= -25NC to +85NC, ENABLE set according to operating

A

VCC -

0.4

-1 +1

-1 +1

-

V

CC

0.4

OL

V

FA
FA

V

V

MAX2851

AC ELECTRICAL CHARACTERISTICS—Rx MODE

(Operating conditions unless otherwise specified: VCC = 2.7V to 3.6V, TA = -25NC to +85NC, RF freq = 5.351GHz, LO freq = 5.35GHz.
Reference freq = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low, with power matching at RXRF_+ and RXRF_- differential
ports using the Typical Operating Circuit. Receiver I/Q output at 100mV
load capacitance. RSSI pin is loaded with 10kI load resistance to ground. Typical values measured at V
channel bandwidths of 40MHz.) (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNITS

RECEIVER SECTION: RF INPUT TO I/Q BASEBAND LOADED OUTPUT
Includes 50I to 100I RF Balun and Matching

RF Input Frequency Range 4.9 5.9 GHz

Peak-to-Peak Gain Variation
Over RF Frequency Range at
One Temperature

RF Input Return Loss All LNA settings -6 dB

Total Voltage Gain

RF Gain Steps Relative to
Maximum Gain

Baseband Gain Range

Baseband Gain Step 2 dB
RF Gain Change Settling Time

4.9GHz to 5.9GHz 1.8 4.2 dB

Maximum gain, Main address 1 D[7:0] = 11111111 61.8 68
Minimum gain, Main address 1 D[7:0] = 00000000 -2 +6.9
Main address 1 D[7:5] = 110 -8
Main address 1 D[7:5] = 101 -16
Main address 1 D[7:5] = 001 -32
Main address 1 D[7:5] = 000 -40

From maximum baseband gain (Main address 1 D[3:0]
= 1111) to minimum baseband gain (Main address 1
D[3:0] = 0000)

Gain settling to within Q0.5dB of steady state, RXHP = 1

loaded with 10kI differential load resistance and 10pF

RMS

= 2.85V, TA = +25NC,

CC

28 30 32 dB

400 ns

dB

dB

_______________________________________________________________________________________ 3

5GHz, 5-Channel MIMO Receiver

AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued)

(Operating conditions unless otherwise specified: VCC = 2.7V to 3.6V, TA = -25NC to +85NC, RF freq = 5.351GHz, LO freq = 5.35GHz.
Reference freq = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low, with power matching at RXRF_+ and RXRF_- differential
ports using the Typical Operating Circuit. Receiver I/Q output at 100mV
load capacitance. RSSI pin is loaded with 10kI load resistance to ground. Typical values measured at V
channel bandwidths of 40MHz.) (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Baseband Gain Change Settling

MAX2851

Time

DSB Noise Figure

Out-of-Band Input IP3

1dB Gain Desensitization by
Alternate Channel Blocker

Input 1dB Gain Compression

Gain settling to within Q0.5dB of steady state, RXHP = 1

Balun input referred,
integrated from 10kHz
to 9.5MHz at I/Q base­band output for 20MHz
RF bandwidth

Balun input referred,
integrated from 10kHz
to 19MHz at I/Q base­band output for 40MHz
RF bandwidth

20MHz RF channel,
two-tone jammers at
+25MHz and +48MHz
frequency offset with

-39dBm/tone

40MHz RF channel,
two-tone jammers at
+50MHz and +96MHz
frequency offset with

-39dBm/tone

Blocker at Q40MHz offset frequency for 20MHz RF
channel

Blocker at Q80MHz offset frequency for 40MHz RF
channel

Max RF gain (Main address 1 D[7:5] = 111) -34
Max RF gain - 8dB (Main address 1 D[7:5] = 110) -25
Max RF gain - 16dB (Main address 1 D[7:5] = 101) -18
Max RF gain - 32dB (Main address 1 D[7:5] = 001) -1

Maximum RF gain (Main
address 1 D[7:5] = 111)

Maximum RF gain - 16dB
(Main address 1 D[7:5] =

101)

Maximum RF gain (Main
address 1 D[7:5] = 111)

Maximum RF gain - 16dB
(Main address 1 D[7:5] =

101)

-65dBm wanted signal, RF
gain = max (Main address 1
D[7:0] = 11101001)

-49dBm wanted signal, RF
gain = max - 16dB (Main
address 1 D[7:0] = 10101001)

-45dBm wanted signal, RF
gain = max - 32dB (Main
address 1 D[7:0] = 00111111)

-65dBm wanted signal, RF
gain = max (Main address 1
D[7:0] = 11101001)

-49dBm wanted signal, RF
gain = max - 16dB (Main
address 1 D[7:0] = 10101001)

-45dBm wanted signal, RF
gain = max - 32dB (Main
address 1 D[7:0] = 00101001)

loaded with 10kI differential load resistance and 10pF

RMS

= 2.85V, TA = +25NC,

CC

200 ns

4.5

15

4.5

15

-13

-5

11

-13

-5

11

-24

-24

dB

dBm

dBm

dBm

4 ______________________________________________________________________________________

5GHz, 5-Channel MIMO Receiver

AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued)

(Operating conditions unless otherwise specified: VCC = 2.7V to 3.6V, TA = -25NC to +85NC, RF freq = 5.351GHz, LO freq = 5.35GHz.
Reference freq = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low, with power matching at RXRF_+ and RXRF_- differential
ports using the Typical Operating Circuit. Receiver I/Q output at 100mV
load capacitance. RSSI pin is loaded with 10kI load resistance to ground. Typical values measured at V
channel bandwidths of 40MHz.) (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Output 1dB Gain Compression

Baseband -3dB Lowpass Corner
Frequency

Baseband Filter Stopband
Rejection

Baseband -3dB Highpass
Corner Frequency

Steady-State I/Q Output DC Error
with AC-Coupling

I/Q Gain Imbalance 1MHz baseband output, 1-sigma value 0.1 dB
I/Q Phase Imbalance 1MHz baseband output, 1-sigma value 0.2 deg
Sideband Suppression 1MHz baseband output 40 dB

Receiver Spurious Signal
Emissions

RF RSSI Output Voltage -25dBm input power 1.6 V
Baseband RSSI Slope 18 26.5 37 mV/dB

Baseband RSSI Maximum
Output Voltage

Baseband RSSI Minimum Output
Voltage

RF Loopback Conversion Gain

Over passband frequency range, at any gain setting,
1dB compression point

Main address 0 D1 = 0 9.5
Main address 0 D1 = 1 19
Rejection at 30MHz offset frequency for 20MHz channel 74
Rejection at 60MHz offset frequency for 40MHz channel 69
Main address 5 D1 = 1 600

Main address 5 D1 = 0, Main address 4 D3 = 0 (Note 3) 0.1

50Fs after enabling receive mode and togging RXHP
from 1 to 0, averaged over many measurements if I/Q
noise voltage exceeds 1mV
ting, no input signal, 1-sigma value

LO frequency -75
2O LO frequency
3O LO frequency
4O LO frequency

Tx VGA gain at max (Main address 9 D[9:4] = 111111), Rx
VGA gain at max - 24dB (Main address 1 D[3:0] = 0101)

RMS

loaded with 10kI differential load resistance and 10pF

RMS

= 2.85V, TA = +25NC,

CC

0.63 V

, at any given gain set-

-17.1 -10 -1.7 dB

2 mV

-62

-75

-54

2.3 V

0.5 V

P-P

MHz

dB

kHzMain address 5 D1 = 0, Main address 4 D3 = 1 10

dBm/

MHz

MAX2851

_______________________________________________________________________________________ 5

5GHz, 5-Channel MIMO Receiver

AC ELECTRICAL CHARACTERISTICS—Tx MODE

(Operating conditions unless otherwise specified: VCC = 2.7V to 3.6V, TA = -25NC to +85NC, RF freq = 5.351GHz, LO freq = 5.35GHz.
Reference freq = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low, with power matching at TXRF+ and TXRF- differential ports
using the Typical Operating Circuit; 100mV
DC-coupled). Typical values measured at V

PARAMETER CONDITIONS MIN TYP MAX UNITS

TRANSMIT SECTION: Tx BASEBAND I/Q INPUTS TO RF OUTPUTS
Includes Matching and Balun Loss

MAX2851

RF Output Frequency Range 4.9 5.9 GHz

Peak-to-Peak Gain Variation
Over RF Band

Maximum Output Power

Output 1dB Gain Compression

Input 1dB Gain Compression

Gain Control Range 24 31.5 34 dB
Gain Control Step 0.5 dB
RF Output Return Loss -3 dB

Unwanted Sideband

Carrier Leakage

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

Baseband Filter Stopband
Rejection

Tx Calibration Ftone Level

Tx Calibration RF Gain Step
Relative to Maximum Gain

Tx Calibration Baseband Gain
Step Relative to Maximum Gain

At one temperature 0.7 1.55 dB

20MHz OFDM signal conforming to spectral emission
mask and -34dB EVM

40MHz OFDM signal confirming to spectral emission
mask and -34dB EVM

Relative to typical maximum output power at 9.5MHz
input frequency

At 19MHz input frequency, over input common-mode
voltage between 0.5V and 1.1V

Over RF channel, RF frequency, baseband frequency,
and gain settings (Note 4)

Over RF channel, RF frequency, and gain settings
(Note 4)

Minimum differential resistance 60 kI
Maximum differential capacitance 2 pF
At 30MHz frequency offset for 20MHz RF channel 86
At 60MHz frequency offset for 40MHz RF channel 67

At Tx gain code (Main address 9 D[9:4]) = 100010 and

-15dBc carrier leakage (Local address 27 D[2:0] = 110
and Main address 1 D[3:0] = 0000)

Local address 27 D[1:0] = 01 -14
Local address 27 D[1:0] = 00 -28

Local address 27 D2 = 0 -5 dB

sine and cosine signal applied to I/Q baseband inputs of transmitter (differential

RMS

= 2.85V, TA = +25NC, channel bandwidths of 40MHz.) (Note 1)

CC

-3

-3

11 dBc

380 mV

-40 dBc

-29 -15 dBc

-24 dBV

dBm

RMS

dB

RMS

dB

6 ______________________________________________________________________________________

5GHz, 5-Channel MIMO Receiver

AC ELECTRICAL CHARACTERISTICS—FREQUENCY SYNTHESIS

(Operating conditions unless otherwise specified: VCC = 2.7V to 3.6V, TA = -25NC to +85NC, freq = 5.35GHz. Reference freq = 40MHz,
ENABLE = high, CS = high, SCLK = DIN = low. Typical values measured at V

PARAMETER CONDITIONS MIN TYP MAX UNITS

FREQUENCY SYNTHESIZER

RF Channel Center Frequency 4.9 5.9 GHz

Channel Center Frequency
Programming Step

Closed-Loop Integrated Phase
Noise

Charge-Pump Output Current 0.8 mA

Spur Level

Reference Frequency 40 MHz

Reference Frequency Input
Levels

Maximum Crystal Motional
Resistance

Crystal Capacitance Tuning
Range

Crystal Capacitance Tuning Step 140 fF

CLKOUT Signal Level 10pF load capacitance

CLKOUT2 Signal Level 4pF load capacitance 0.3 V

Loop BW = 200kHz, integrate phase noise from 1kHz
to 10MHz

= 0 to 19MHz -42

f

OFFSET

= 40MHz -66

f

OFFSET

AC-coupled to XTAL pin 800 mV

Base-to-ground capacitance 30 pF

= 2.85V, TA = +25NC, LO freq = 5.35GHz.) (Note 1)

CC

76.294 Hz

-35 dBc

50

-

V

CC

0.8

VCC -

0.1

dBc

I

V

P-P

P-P

P-P

MAX2851

AC ELECTRICAL CHARACTERISTICS—MISCELLANEOUS BLOCKS

(Operating conditions unless otherwise specified: VCC = 2.7V to 3.6V, TA = -25NC to +85NC. Reference freq = 40MHz, ENABLE =
high, CS = high, SCLK = DIN = low. Typical values measured at V

PARAMETER CONDITIONS MIN TYP MAX UNITS

PA POWER-DETECTOR MUX

Output Voltage Drop

PA ON/OFF CONTROL

V

CC_PA_BIAS

V

CC_PA_BIAS

Output High Level 10mA load current, Main address 11 D[7:5] = 011 2.8 V
Output Low Level 1mA load current, Main address 11 D[7:5] = 011 25 mV
Turn-On Time

ON-CHIP TEMPERATURE SENSOR

Digital Output Code

Input Voltage Range 3.1 3.6 V

Supply Current With 10mA load at PA_BIAS 10.5 mA

_______________________________________________________________________________________ 7

= 2.0V, load resistance = 10kI to ground

V

IN

Measured from CS rising edge

Readout at DOUT pin
through Main address 3
D[4:0]

= 2.85V, TA = +25NC.) (Note 1)

CC

= +25NC

T

A

T

= +85NC

A

T

= -25NC

A

15 32 mV

0.3

13
22

2

Fs

5GHz, 5-Channel MIMO Receiver

AC ELECTRICAL CHARACTERISTICS—TIMING

(Operating conditions unless otherwise specified: VCC = 2.7V to 3.6V, TA = -25NC to +85NC, freq = 5.35GHz. Reference freq =
40MHz, ENABLE = high, CS = high, SCLK = DIN = low. Typical values measured at V
(Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SYSTEM TIMING

Shutdown Time 2

MAX2851

Maximum Channel Switching
Time

Maximum Channel Switching
Time with Preselected VCO
Sub-Band

Rx/Tx Turnaround Time

Tx Turn-On Time (from Standby
Mode)

Tx Turn-Off Time (to Standby
Mode)

Rx Turn-On Time (from Standby
Mode)

Rx Turn-Off Time (to Standby
Mode)

Loop bandwidth = 200kHz, settling to
within Q1kHz from steady state

Loop bandwidth = 200kHz, settling to
within Q1kHz from steady state

Rx to Tx mode, Tx gain

Measured
from CS ris­ing edge

Measured from CS rising edge, Tx gain
settles to within 0.2dB of steady state

From CS rising edge

Measured from CS rising edge, Rx gain
settles to within 0.5dB of steady state

From CS rising edge

settles to within 0.2dB of
steady state

Tx to Rx mode with RXHP =
1, Rx gain settles to within

0.5dB of steady state

= 2.85V, TA = +25NC, LO freq = 5.35GHz.)

CC

2 ms

56

2

2

2

0.1

2

0.1

Fs

Fs

Fs

Fs

Fs

Fs

Fs

8 ______________________________________________________________________________________

5GHz, 5-Channel MIMO Receiver

AC ELECTRICAL CHARACTERISTICS—TIMING (continued)

(Operating conditions unless otherwise specified: VCC = 2.7V to 3.6V, TA = -25NC to +85NC, freq = 5.35GHz. Reference freq =
40MHz, ENABLE = high, CS = high, SCLK = DIN = low. Typical values measured at V
(Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

4-WIRE SERIAL INTERFACE TIMING (Figure 1)

SCLK Rising Edge to CS Falling
Edge Wait Time

Falling Edge of CS to Rising
Edge of First SCLK Time

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

CS High Pulse Width

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

SCLK Frequency f
Rise Time t
Fall Time t

Note 1: The MAX2851 is production tested at TA = +25NC, minimum/maximum limits at TA = +25NC are guaranteed by test unless

otherwise specified. Minimum/maximum limits at TA = -25NC and +85NC are guaranteed by design and characterization. There
is no power-on register settings self-reset; recommended register settings must be loaded after VCC is applied.

Note 2: Minimum/maximum limit is guaranteed by design and characterization.
Note 3: It is currently not recommended and not tested. For test coverage support, contact manufacturer.
Note 4: For optimal Rx and Tx quadrature accuracy over temperature, the user can utilize the Rx calibration and Tx calibration circuit

to assist quadrature calibration.

t

CSO

t

CSS

DS

DH

CH

CL

t

CSH

t

CSW

t

CS1

CLK

6 ns

R

F

= 2.85V, TA = +25NC, LO freq = 5.35GHz.)

CC

6 ns

6 ns

6 ns
6 ns
6 ns
6 ns

50 ns

6 ns

40 MHz

2.5 ns

2.5 ns

MAX2851

_______________________________________________________________________________________ 9

5GHz, 5-Channel MIMO Receiver

Typical Operating Characteristics

(VCC = 2.8V, TA = +25NC, f
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)

Rx MODE SINGLE-CHANNEL

SUPPLY CURRENT

152

MAX2851

150

(mA)

CC

I

148

146

144

142

140

138

TA = +85°C

2.6 3.6

Rx3 MAXIMUM GAIN vs. FREQUENCY

75

70

65

60

55

50

45

GAIN (dB)

40

35

30

25

20

4.9 5.9
FREQUENCY (GHz)

= 5.35GHz, f

LO

TA = +25°C

TA = -40°C

VCC (V)

LNA = MAX GAIN

LNA = MAX - 8dB

LNA = MAX - 16dB

LNA = MAX - 24dB

LNA = MAX - 32dB

LNA = MAX - 40dB

= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced

REF

RECEIVER

Rx NOISE FIGURE vs. VGA GAIN

Rx MODE 5-CHANNEL SUPPLY CURRENT

390

385

MAX2851 toc01

380

375

(mA)

CC

I

370

365

360

3.53.43.33.23.13.02.92.82.7

355

TA = +85°C

TA = +25°C

TA = -40°C

2.6 3.6
VCC (V)

MAX2851 toc02

3.53.43.33.23.13.02.92.82.7

Rx3 MAXIMUM GAIN

vs. TEMPERATURE AND FREQUENCY

74

73

MAX2851 toc04

72

71

70

69

GAIN (dB)

68

67

66

65

5.85.75.5 5.65.1 5.2 5.3 5.45.0

64

TA = -20°C

MAX2851 toc05

TA = +25°C

TA = +85°C

5.85.75.5 5.65.1 5.2 5.3 5.45.04.9 5.9

FREQUENCY (GHz)

SETTINGS (BALUN INPUT REFERRED)

45

40

35

30

25

20

NOISE FIGURE (dB)

15

10

5

0

0 14 15

Rx VGA GAIN SETTINGS

Rx2 MAXIMUM GAIN WITH FIXED

LNA SUB-BAND (MAIN ADDRESS 2 D[6:5])

75

73

71

69

67

65

GAIN (dB)

63

61

59

57

55

BAND 0

BAND 1

FREQUENCY (GHz)

BAND 2

BAND 3

MAX - 40dB

MAX - 32dB

MAX - 24dB

MAX - 16dB

MAX - 8dB

MAX2851 toc03

MAX

131210 113 4 5 6 7 8 91 2

MAX2851 toc06

5.85.75.5 5.65.1 5.2 5.3 5.45.04.9 5.9

Rx MAXIMUM GAIN vs. FREQUENCY

71

70

69

68

GAIN (dB)

67

66

65

64

Rx3

Rx2

Rx1

FREQUENCY (GHz)

Rx4

Rx5

5.85.75.5 5.65.1 5.2 5.3 5.45.04.9 5.9

MAX2851 toc07

Rx GAIN vs. BASEBAND VGA GAIN

80

70

60

50

40

30

GAIN (dB)

20

10

0

-10
0 16

LNA = MAX - 8dB

LNA = MAX - 16dB

LNA = MAX - 24dB

BASEBAND VGA GAIN CODE

LNA = MAX - 32dB

LNA = MAX - 40dB

LNA = MAX

MAX2851 toc08

14128 104 62

Rx OUTPUT V

1.4

FBB = 1MHz

FBB = 19MHz

0

0 16

BASEBAND VGA GAIN CODE

)

(V

OUTPUT V

RMS

1dB

1.2

1.0

0.8

0.6

0.4

0.2

10 _____________________________________________________________________________________

vs. GAIN SETTING

1dB

TA = +25°C

TA = +85°C

TA = +25°C

MAX2851 toc09

TA = -20°CTA = -20°C

TA = +85°C

1412108642

5GHz, 5-Channel MIMO Receiver

Rx RF RSSI ATTACK TIME

Typical Operating Characteristics (continued)

(VCC = 2.8V, TA = +25NC, f
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)

Rx EVM vs. INPUT POWER

(CHANNEL BANDWIDTH = 20MHz)

-15

-20

-25

Rx EVM (dB)

-30

-35

-40

-90 10

LNA = MAX

LNA = MAX = -8dB

LNA = MAX = -16dB

LNA = MAX = -24dB

INPUT POWER (dBm)

Rx4 EMISSION SPECTRUM AT LNA INPUT

(LNA MAX GAIN)

0

-10

-20

-30

-40

-50

-60

OUTPUT POWER (dBm)

-70

-80

-90

-100
0Hz 2.65GHz

2 LO

2.65GHz/div

RF FREQUENCY

= 5.35GHz, f

LO

LNA = MAX = -40dB

LNA = MAX = -32dB

-10-30-50-70

4 LO

= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced

REF

Rx EVM vs. OFDM JAMMER POWER AT

MAX2851 toc10

Rx EVM vs. Rx BASEBAND

OUTPUT LEVEL

12

10

8

6

Rx EVM (%)

4

2

0

-30 0

VGA GAIN = 2/4/6/8/10/12/14

VGA GAIN = 0

VGA GAIN =

3/5/7/9/11/13/15

Rx BASEBAND OUTPUT LEVEL (dBV

-5-10-15-20-25

RMS

MAX2851 toc11

)

20MHz AND 40MHz OFFSET FREQUENCY

WITH WANTED SIGNAL AT -66dBm

14

12

10

8

6

Rx EVM (%)

4

2

0

-40 10

20MHz OFFSET

40MHz OFFSET

INPUT POWER (dBm)

Rx INPUT IMPEDANCE

Rx3 INPUT RETURN LOSS

TA = -40°C

4.8 6.0
FREQUENCY (GHz)

TA = +25°C

TA = +85°C

MAX2851 toc13

60

AT MAX LNA GAIN

50

40

30

20

Rx2, 3, 4

REAL PART (I)

10

0

-10

-20

4.9 5.9

Rx5

Rx1

RF FREQUENCY (GHz)

Rx5

Rx1

Rx2, 3, 4

MAX2851 toc14

5.85.75.0 5.1 5.2 5.4 5.55.3 5.6

40

30

20

10

-10

-20

-30

-40

0

-2

-4

IMAGINARY PART (

-6

-8

0

-10

S11 (dB)

-12

I

)

-14

-16

-18

-20

50-5-10-15-20-25-30-35

5.85.65.45.25.0

MAX2851

MAX2851 toc12

MAX2851 toc15

0

-2

-4

-6

-8

-10

S11 (dB)

-12

-14

-16

-18

-20

4.8 6.0

Rx1, 2, 4

Rx5

FREQUENCY (GHz)

______________________________________________________________________________________ 11

Rx INPUT RETURN LOSS

Rx3

2.5

Rx RF RSSI OUTPUT

MAX2851 toc16

2.0

1.5

1.0

RF RSSI OUTPUT VOLTAGE (V)

0.5

5.85.65.45.25.0

0

LOW GAIN, TA = +85°C

LOW GAIN,
TA = +25°C

LOW GAIN,
TA = -20°C

HIGH GAIN, TA = -20°C

-50 0
RF INPUT POWER (dBm)

HIGH GAIN,
T

= +85°C

A

HIGH GAIN,
TA = +25°C

MAX2851 toc17

1.0V/div

0V

1.0V/div

0V

-5-10-15-20-25-30-35-40-45

(+40dB SIGNAL STEP)

D: 280ns
@: 192ns

GAIN CONTROL

V

RSSI

400ns/div

MAX2851 toc18

D: 1.32V
@: 1.84V

5GHz, 5-Channel MIMO Receiver

Typical Operating Characteristics (continued)

(VCC = 2.8V, TA = +25NC, f
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)

= 5.35GHz, f

LO

= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced

REF

Rx RF RSSI DELAY TIME

(-40dB SIGNAL STEP)

MAX2851

1.0V/div

0V

1.0V/div

0V

2.7V

0V

2.0V

0.6V

GAIN CONTROL

V

RSSI

Rx BASEBAND RSSI

-32dB STEP RESPONSE

LNA GAIN CONTROL

RSSI OUTPUT

400ns/div

D: 1.18µs
@: 1.16

D: 216ns
@: 128ns

µs

MAX2851 toc19

D: 1.30V
@: 460mV

MAX2851 toc22

D: 1.62V
@: 480mV

BASEBAND RSSI VOLTAGE

vs. INPUT POWER

3.0

2.5

2.0

1.5

1.0

0.5

BASEBAND RSSI OUTPUT VOLTAGE (V)

0

-100 20

LNA = MAX

LNA = MAX - 8dB

RF INPUT POWER (dBm)

LNA = MAX - 40dB

MAX - 24dB

LNA = MAX - 32dB

LNA = MAX - 16dB

Rx LPF 20MHz CHANNEL BANDWIDTH

RESPONSE

-35

RESPONSE (dB)

LNA =

Rx BASEBAND RSSI

+40dB STEP RESPONSE

D: 460ns

1

µs/div

@: 440ns

MAX2851 toc20

2.7V

0V

2.4V

0.8V

0-20-40-60-80

LNA GAIN CONTROL

RSSI OUTPUT

MAX2851 toc21

D: 1.50V
@: 2.30V

Rx LPF 40MHz CHANNEL BANDWIDTH

RESPONSE

-35

MAX2851 toc23

RESPONSE (dB)

MAX2851 toc24

1

µs/div

Rx LPF 20MHz CHANNEL

BANDWIDTH GROUP DELAY

100

GROUP DELAY (ns)

0

10k 100M

FREQUENCY (Hz)

MAX2851 toc25

-135
10k 100M

BASEBAND FREQUENCY (Hz)

Rx LPF 40MHz CHANNEL

BANDWIDTH GROUP DELAY

100

GROUP DELAY (ns)

0

10k 100M

FREQUENCY (Hz)

MAX2851 toc26

-135
10k 100M

FREQUENCY (Hz)

Rx DC OFFSET SETTLING RESPONSE

(-30dB Rx VGA GAIN STEP)

GAIN-CONTROL
TOGGLE

0V

Rx BASEBAND

I/Q OUTPUT

50mV/div

12 _____________________________________________________________________________________

MAX2851 toc27

CH1 PEAK TO
PEAK: 81.9mV

200ns/div

5GHz, 5-Channel MIMO Receiver

Typical Operating Characteristics (continued)

(VCC = 2.8V, TA = +25NC, f
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)

= 5.35GHz, f

LO

= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced

REF

MAX2851

10mV/div

Rx BASEBAND

I/Q OUTPUT

Rx BASEBAND

I/Q OUTPUT

10mV/div

Rx DC OFFSET SETTLING RESPONSE

(+8dB Rx VGA GAIN STEP)

CH1 PEAK TO

GAIN-CONTROL

0V

TOGGLE

200ns/div

PEAK: 8.60mV

Rx BASEBAND DC OFFSET SETTLING

RESPONSE WITH RxHP = 1

(MAX - 40dB TO MAX LNA GAIN STEP)

GAIN-CONTROL

TOGGLE

0V

MAX2851 toc28

MAX2851 toc31

10mV/div

Rx BASEBAND

I/Q OUTPUT

Rx BASEBAND

I/Q OUTPUT

50mV/div

Rx DC OFFSET SETTLING RESPONSE

(+16dB Rx VGA GAIN STEP)

CH1 PEAK TO

0V

GAIN-CONTROL

TOGGLE

200ns/div

PEAK: 17.3mV

Rx BASEBAND DC OFFSET SETTLING

RESPONSE WITH RxHP = 0

(MAX TO MAX - 40dB LNA GAIN STEP)

GAIN-CONTROL

TOGGLE

0V

MAX2851 toc29

MAX2851 toc32

Rx BASEBAND

I/Q OUTPUT

50mV/div

Rx BASEBAND

I/Q OUTPUT

10mV/div

Rx DC OFFSET SETTLING RESPONSE

(+32dB Rx VGA GAIN STEP)

GAIN-CONTROL TOGGLE

0V

200ns/div

CH1 PEAK TO
PEAK: 69.0mV

Rx BASEBAND DC OFFSET SETTLING

RESPONSE WITH RxHP = 1

(MAX - 40dB TO MAX LNA GAIN STEP)

GAIN-CONTROL

TOGGLE

0V

MAX2851 toc30

MAX2851 toc33

Rx BASEBAND

I/Q OUTPUT

50mV/div

10µs/div

Rx BASEBAND DC OFFSET SETTLING

RESPONSE WITH RxHP = 0

(MAX - 40dB TO MAX LNA GAIN STEP)

GAIN-CONTROL

TOGGLE

0V

10µs/div

______________________________________________________________________________________ 13

MAX2851 toc34

Rx BASEBAND

I/Q OUTPUT

0.1V/div

10µs/div

Rx BASEBAND VGA SETTLING

RESPONSE (-30dB BASEBAND

VGA GAIN STEP)

0V

100ns/div

MAX2851 toc35

CH1 PEAK TO
PEAK: 652mV

GAIN-CONTROL

TOGGLE

Rx BASEBAND

OUTPUT

0.1V/div

Rx BASEBAND VGA SETTLING

RESPONSE (+4dB BASEBAND

VGA GAIN STEP)

GAIN-CONTROL

TOGGLE

0V

100ns/div

10µs/div

MAX2851 toc36

CH1 PEAK TO
PEAK: 568mV

5GHz, 5-Channel MIMO Receiver

Typical Operating Characteristics (continued)

(VCC = 2.8V, TA = +25NC, f
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)

= 5.35GHz, f

LO

= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced

REF

Rx BASEBAND VGA SETTLING

RESPONSE (+16dB BASEBAND

VGA GAIN STEP)

MAX2851

GAIN-CONTROL

Rx BASEBAND

OUTPUT

0V

0.1V/div

Rx BASEBAND

OUTPUT

0V

0.1V/div

TOGGLE

Rx LNA SETTLING RESPONSE

(MAX - 8dB TO MAX GAIN STEP)

GAIN-CONTROL

TOGGLE

D: 130mv
@: 132mv

CH1 RMS:
188mV

100ns/div

100ns/div

MAX2851 toc37

CH1 PEAK TO
PEAK: 532mV

MAX2851 toc40

Rx BASEBAND

OUTPUT

0.1V/div

Rx BASEBAND

OUTPUT

0.1V/div

Rx BASEBAND VGA SETTLING

RESPONSE (+30dB BASEBAND

VGA GAIN STEP)

CH1 PEAK TO
PEAK: 800mV
CLIPPING NEGATIVE

GAIN-CONTROL

TOGGLE

0V

100ns/div

Rx LNA SETTLING RESPONSE

(MAX - 16dB TO MAX GAIN STEP)

CH1 RMS: 176mV

GAIN-CONTROL

TOGGLE

0V

D: 130mv
@: 132mv

100ns/div

MAX2851 toc38

MAX2851 toc41

0.1V/div

Rx BASEBAND

OUTPUT

Rx BASEBAND

OUTPUT

0.1V/div

Rx LNA SETTLING RESPONSE

(MAX TO MAX - 40dB GAIN STEP)

0V

100ns/div

Rx LNA SETTLING RESPONSE

(MAX - 24dB TO MAX GAIN STEP)

CH1 RMS: 174mV

GAIN-CONTROL

TOGGLE

0V

D: 130mv
@: 132mv

100ns/div

MAX2851 toc39

D: 130mv
@: 132mv

CH1 RMS:
168mV

GAIN-CONTROL

TOGGLE

MAX2851 toc42

Rx BASEBAND

OUTPUT

0.1V/div

Rx LNA SETTLING RESPONSE

(MAX - 32dB TO MAX GAIN STEP)

CH1 RMS: 155mV

GAIN-CONTROL

TOGGLE

0V

D: 130mv
@: 132mv

200ns/div

MAX2851 toc43

Rx BASEBAND

OUTPUT

0.1V/div

Rx LNA SETTLING RESPONSE

(MAX - 40dB TO MAX GAIN STEP)

CH1 RMS: 154mV

GAIN-CONTROL

TOGGLE

0V

D: 130mv
@: 132mv

200ns/div

MAX2851 toc44

HISTOGRAM: Rx I/Q GAIN IMBALANCE

648

540

432

324

216

108

0

-800.00m 800.00m0
SAMPLES = 3413, AVG = -0.015dB,

14 _____________________________________________________________________________________

MAX2851 toc45

STDEV = 0.042dB

5GHz, 5-Channel MIMO Receiver

Typical Operating Characteristics (continued)

(VCC = 2.8V, TA = +25NC, f
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)

HISTOGRAM: Rx I/Q PHASE IMBALANCE

180

150

120

90

= 5.35GHz, f

LO

MAX2851 toc46

= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced

REF

POWER-ON DC OFFSET CANCELLATION

HISTOGRAM: Rx STATIC DC OFFSET

132

110

88

66

MAX2851 toc47

0V

2V/div

WITH INPUT SIGNAL

D: 2.14µs
@: 2.12

Rx ENABLE

Rx BASEBAND OUTPUT

µs

D: 112mV
@: 104mV

MAX2851 toc48

MAX2851

60

30

0

-2.0000 0 2.0000
SAMPLES = 3413, AVG = -0.15deg,

STDEV = 0.18deg

RXBBI_

50mV/div

RXBBQ_

500mV/div

44

22

0

-15.000m 0 15.000m

POWER-ON DC OFFSET CANCELLATION

WITHOUT INPUT SIGNAL

Rx ENABLE

TURN-ON
TRANSIENT

400ns/div

MAX2851 toc49

SAMPLES = 3413, AVG = -0.5mV,

STDEV = 2.14mV

80

70

60

50

40

ISOLATION (dB)

30

20

10

0V

0.1V/div

ENGAGE 600kHz
HIGHPASS CORNER

1µs/div

Rx CHANNEL ISOLATION

Rx3 TO Rx4

Rx4 TO Rx5

0

4900

5000

5100

5200

Rx5 TO Rx4

Rx1 TO Rx2 Rx2 TO Rx3

5300

5400

5500

5600

fLO (MHz)

5700

5800

MAX2851 toc50

5900

______________________________________________________________________________________ 15

5GHz, 5-Channel MIMO Receiver

Typical Operating Characteristics (continued)

(VCC = 2.8V, TA = +25NC, f
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)

Tx MODE SUPPLY CURRENT

184

MAX2851

182

(mA)

CC

I

180

178

176

174

172

TA = +85°C

2.6 3.6

Tx OUTPUT POWER

vs. FREQUENCY AT MAXIMUM GAIN

1

0

-1

-2

-3

OUTPUT POWER (dBm)

-4

-5
4900 5900

TA = -20°C

TA = +25°C

FREQUENCY (MHz)

Tx EVM vs. OUTPUT POWER

(100mV

-28

-30

-32

Tx EVM (dB)

-34

-36

-38

-40 0

54Mbps WLAN SIGNAL)

RMS

TA = +25°C

OUTPUT POWER (dBm)

16 _____________________________________________________________________________________

TA = -40°C

VCC (V)

TA = -20°C

= 5.35GHz, f

LO

TA = +25°C

TA = +85°C

5700550053005100

TA = +85°C

= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced

REF

TRANSMITTER

OUTPUT RETURN LOSS AT

= +25°C vs. Tx CHANNELS

T

A

0

MAX2851 toc51

-5

-10

5300

5400

Tx2

Tx3

Tx1

5500

5600

-15

RETURN LOSS (dB)

-20

3.53.43.33.23.13.02.92.82.7

-25

4900

5000

5100

5200

FREQUENCY (MHz)

Tx4

5700

5800

MAX2851 toc52s

5900

0

-1

-2

-3

-4

-5

RETURN LOSS (dB)

-6

-7

-8

-9

Tx OUTPUT POWER vs. GAIN SETTING

0

-5

MAX2851 toc54

-10

-15

-20

-25

OUTPUT POWER (dBm)

-30

-35

-40

TA = -20°C

TA = +85°C

TA = +25°C

0 70

Tx GAIN CODE

605010 20 30 40

MAX2851 toc55

-0.2

-0.3

-0.4

-0.5

GAIN STEP (dB)

-0.6

-0.7

-0.8

Tx MAX OUTPUT POWER MEETING

-33dBc EVM AND 802.11a
SPECTRAL MASK

MAX2851 toc58

10dB/div

-40dBr

-18

-28

-38

-48

-58

-68

-78

-88

-98

2

MAX2851 toc57

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

0

-2

-4

OUTPUT POWER (dBm)

-6

-8
4900 5900

TA = -20°C

TA = +25°C

FREQUENCY (MHz)

TA = +85°C

5700550053005100

Tx OUTPUT RETURN LOSS

vs. FREQUENCY

TA = -20°C

TA = +25°C

TA = +85°C

FREQUENCY (GHz)

Tx GAIN STEP vs. GAIN SETTING

TA = -20°CTA = +25°C

TA = +85°C

0 70

Tx GAIN CODE

Tx2 OUTPUT SPECTRUM AT -5dBM

(20MHz CHANNEL BANDWIDTH,

802.11a 54Mbps)

0dBr

5300 5350 5400

RF FREQUENCY (MHz)

MAX2851 toc53

5.75.55.35.14.9 5.9

MAX2851 toc56

605040302010

MAX2851 toc59

5GHz, 5-Channel MIMO Receiver

Typical Operating Characteristics (continued)

(VCC = 2.8V, TA = +25NC, f
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)

= 5.35GHz, f

LO

= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced

REF

MAX2851

Tx CARRIER LEAKAGE

vs. RF FREQUENCY

-35

-40

-45

-50
TA = +25°C

-55

CARRIER LEAKAGE (dBc)

-60

-65

5100

5000

4900

UNWANTED SIDEBAND (dBc)

TA = -20°C

MAX2851 toc60

TA = +85°C

5800

5700

5600

5500

5400

5300

5200

RF FREQUENCY (MHz)

5900

Tx UNWANTED SIDEBAND

vs. GAIN SETTING

-25

-30

-35

TA = -20°C

-40

-45

-50
0 70

TA = +85°C

TA = +25°C

Tx GAIN CODE

Tx CARRIER LEAKAGE vs. GAIN SETTING

-25

-30

-35

-40

-45

-50

CARRIER LEAKAGE (dBc)

-55

-60

-65
0 70

605040302010

TA = +25°C

MAX2851 toc63

TA = +85°C

Tx GAIN CODE

TA = -20

-10

-20

-30

-40

-50

-60

-70

OUTPUT POWER (dBm/MHz)

-80

-90

-100

Tx UNWANTED SIDEBAND

vs. RF FREQUENCY

-35

°C

605010 20 30 40

-40

MAX2859 toc61

-45

-50

-55

UNWANTED SIDEBAND (dBc)

-60

-65

4900

5100

5000

RF FREQUENCY (MHz)

Tx6 OUTPUT EMISSION SPECTRUM

AT MAX GAIN AND COLD

(100mV

0

0Hz 26.5

802.11A 54Mbps SIGNAL)

RMS

LO

3 LO

2 LO

2.65GHz/div

RF FREQUENCY (GHz)

4 LO

TA = +25°C

5300

5200

MAX2851 toc64

5400

TA = +85°C

TA = -20°C

5600

5500

5700

5800

MAX2851 toc62

5900

HISTOGRAM: CARRIER SUPPRESSION

102

85

68

51

34

17

0

-50.000 -18.000-34.000
SAMPLES = 3413, AVG = -34.9dBc,

STDEV = 3.61dB

MAX2851 toc65

HISTOGRAM: SIDEBAND SUPPRESSION

156

130

104

78

52

26

0

-62.000 -26.000-44.000
SAMPLES = 3413, AVG = -44.6dBc,

STDEV = 2.58dB

MAX2851 toc66

______________________________________________________________________________________ 17

5GHz, 5-Channel MIMO Receiver

Typical Operating Characteristics (continued)

(VCC = 2.8V, TA = +25NC, f
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)

CLKOUT MODE SUPPLY CURRENT

6.0

= 5.35GHz, f

LO

= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced

REF

SYNTHESIZER

CLKOUT2 MODE SUPPLY CURRENT

7.0

LO FREQUENCY vs. DIFFERENTIAL

TUNE VOLTAGE AT T

7.0

= +25°C

A

MAX2851

5.5

5.0

(mA)

4.5

CC

I

TA = +85°C

4.0

3.5

3.0

2.6 3.6

LO GAIN (MHz/V)

PHASE NOISE (dBc/Hz)

6.5

TA = +25°C

TA = -40°C

VCC (V)

MAX2851 toc67

6.0

(mA)

5.5

CC

I

5.0

4.5

3.53.43.33.23.13.02.92.82.7

4.0

LO GAIN vs. DIFFERENTIAL

TUNE VOLTAGE AT T

600

500

400

300

200

100

0

0 2.5

DIFFERENTIAL TUNE VOLTAGE (V)

= +25°C

A

LO PHASE NOISE AT 5900MHz AND HOT

TEMPERATURE

-50

-60

-70

-80

-90

-100

-110

-120

-130

-140

-150
1k 10M

OFFSET FREQUENCY (Hz)

TA = +25°C

TA = +85°C

TA = -40°C

2.6 3.6
VCC (V)

3.53.43.33.23.13.02.92.82.7

LO PHASE NOISE AT 5350MHz AND ROOM

-50

-60

MAX2851 toc70

2.01.51.00.5

-70

-80

-90

-100

-110

PHASE NOISE (dBc/Hz)

-120

-130

-140

-150
1k 10M

AUTOMATIC VCO SUB-BAND SELECTION)

25kHz

MAX2851 toc72

FREQUENCY (5kHz/div)

-25kHz
0s 3.99ms

6.5

MAX2851 toc68

6.0

5.5

5.0

LO FREQUENCY (GHz)

4.5

4.0
0 2.5

DIFFERENTIAL TUNE VOLTAGE (V)

TEMPERATURE

OFFSET FREQUENCY (Hz)

CHANNEL SWITCHING FREQUENCY

SETTLING (4900MHz TO 5900MHz,

400µs/div

MAX2851 toc69

2.01.51.00.5

MAX2851 toc71

MAX2851 toc73

18 _____________________________________________________________________________________

5GHz, 5-Channel MIMO Receiver

CRYSTAL TUNING CODE

Typical Operating Characteristics (continued)

(VCC = 2.8V, TA = +25NC, f
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)

CHANNEL SWITCHING FREQUENCY
SETTLING (5900MHz TO 4900MHz,

AUTOMATIC VCO SUB-BAND SELECTION)

25kHz

= 5.35GHz, f

LO

= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced

REF

CHANNEL SWITCHING FREQUENCY
SETTLING (4900MHz TO 5900MHz,

MANUAL VCO SUB-BAND SELECTION)

25kHz

CHANNEL SWITCHING FREQUENCY
SETTLING (5900MHz TO 4900MHz,

MANUAL VCO SUB-BAND SELECTION)

25kHz

MAX2851

FREQUENCY (5kHz/div)

-25kHz
0s 3.99ms

400µs/div

Tx-TO-Rx TURNAROUND FREQUENCY

SETTLING AT MAX Tx POWER

50kHz

FREQUENCY ERROR (10kHz/div)

-50kHz
0s 49.84µs

5µs/div

CRYSTAL OSCILLATOR TUNING STEP

WITH KYOCERA 2520 40MHz CRYSTAL

2.5

MAX2851 toc74

FREQUENCY (5kHz/div)

-25kHz
0s 99.22µs

Rx-TO-Tx TURNAROUND FREQUENCY

50kHz

MAX2851 toc77

FREQUENCY ERROR (10kHz/div)

-50kHz
0s 49.84µs

10µs/div

SETTLING AT MAX Tx POWER

5µs/div

CAPACITANCE AT BASE AND EMITTER

(INCLUDE EV KIT COMPONENTS)

140

MAX2851 toc75

FREQUENCY (5kHz/div)

-25kHz
0s 99.22µs

CRYSTAL OSCILLATOR TUNING RANGE

WITH KYOCERA 40MHz 2520 CRYSTAL

100

80

MAX2851 toc78

60

40

20

0

-20

-40

-60

-80

FREQUENCY DEVIATION FROM 40MHz (ppm)

-100
0 300

CRYSTAL OSCILLATOR TUNING

MAX2851 toc76

10µs/div

MAX2851 toc79

TA = +25°C

TA = +85°C

TA = -20°C

25020015010050

CRYSTAL TUNING CODE

2.0

1.5

1.0

(ppm)

0.5

0

CRYSTAL OSCILLATOR FREQUENCY TUNING STEP

-0.5
0 300

CRYSTAL TUNING CODE

MAX2851 toc80

25020015010050

120

100

80

60

40

20

CAPACITANCE AT BASE AND EMITTER (pF)

0

0 300

EMITTER-TO-GROUND

CAPACITANCE

BASE-TO-GROUND

CAPACITANCE

MAX2851 toc81

25020015010050

______________________________________________________________________________________ 19

5GHz, 5-Channel MIMO Receiver

Pin Configuration

TOP VIEW

MAX2851

V

CC_LNA2

RXRF2-

RXRF2+

V

CC_MXR1

V

CC_LNA3

RXRF3-

RXRF3+

V

CC_MXR2

PA_DET

RXRF4-

RXRF4+

V

CC_LNA4

PA_BIAS

TXRF+

V

CC_PA_BIAS

GND

TXRF-

ENABLE

68 67 66 65 64 63 62 61

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

*EP

18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

V

RXBBQ1+

RXBBQ1-

CC_LNA1

RXRF1+

RXRF1-

CC_BB1

V

RXBB2Q-

RXBBI1+

RXBBI1-

60 59 58 57 56 55 54 53 52

RXBBI2-

RXBB2Q+

RXBBI2+

MAX2851

RSSI

XTAL

XTAL_CAP

CC_XTAL

V

51

50

49

48

47

46

45

44

43

42

41

40

39

38

37

36

35

CLKOUT

CLKOUT2

DOUT

V

CC_DIG

CPOUT-

CPOUT+

GND_VCO

BYP_VCO

V

CC_VCO

RXBBQ3-

RXBBQ3+

RXBBI3-

RXBBI3+

DIN

SCLK

CS

RXBBQ4-

CC_UCX

V

RXRF5-

CC_LNA5

V

RXRF5+

GND

CC_BB2

V

RXBBI5-

RXBBI5+

RXBBQ5+

TXBBI+

RXBBQ5-

TXBBI-

TXBBQ-

TXBBQ+

RXBBI4-

RXBBI4+

RXBBQ4+

TQFN

*EXPOSED PAD.

20 _____________________________________________________________________________________

5GHz, 5-Channel MIMO Receiver

Pin Description

PIN NAME FUNCTION

1, 22 GND Ground

2 V
3 RXRF2­4 RXRF2+
5 V
6 V
7 RXRF3­8 RXRF3+

9 V
10 PA_DET External Power-Amplifier Detector Mux Input
11 RXRF4­12 RXRF4+
13 V
14 PA_BIAS External Power-Amplifier Voltage Bias Output
15 TXRF+
16 TXRF-

17

18 V
19 V
20 RXRF5­21 RXRF5+
23 V
24 RXBBI5+
25 RXBBI5­26 RXBBQ5+
27 RXBBQ5­28 TXBBI+
29 TXBBI­30 TXBBQ+
31 TXBBQ­32 RXBBI4+
33 RXBBI4­34 RXBBQ4+
35 RXBBQ4­36
37 SCLK Serial-Clock Logic Input of 4-Wire Serial Interface
38 DIN Data Logic Input of 4-Wire Serial Interface
39 RXBBI3+
40 RXBBI3­41 RXBBQ3+
42 RXBBQ3-

CC_LNA2

CC_MXR1

CC_LNA3

CC_MXR2

CC_LNA4

V

CC_PA_

BIAS

CC_UCX

CC_LNA5

CC_BB2

CS

Receiver 2 LNA Supply Voltage. Bypass with a capacitor as close as possible to the pin.

Receiver 2 LNA Differential Input. Input is DC-coupled and biased internally at 1.2V.

Receiver Downconverter Supply Voltage 1. Bypass with a capacitor as close as possible to the pin.
Receiver 3 LNA Supply Voltage. Bypass with a capacitor as close as possible to the pin.

Receiver 3 LNA Differential Input. Input is DC-coupled and biased internally at 1.2V.

Receiver Downconverter Supply Voltage 2. Bypass with a capacitor as close as possible to the pin.

Receiver 4 LNA Differential Input. Input is DC-coupled and biased internally at 1.2V.

Receiver 4 LNA Supply Voltage. Bypass with a capacitor as close as possible to the pin.

Transmitter Differential Output. These pins are in open-collector configuration. These pins should
be biased at the supply voltage with differential impedance terminated at 300I.

External Power-Amplifier Voltage Bias and Detector Mux Supply Voltage. Bypass with a capacitor
as close as possible to the pin.

Transmitter Upconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin.
Receiver 5 LNA Supply Voltage. Bypass with a capacitor as close as possible to the pin.

Receiver 5 LNA Differential Input. Input is DC-coupled and biased internally at 1.2V.

Receiver Baseband Supply Voltage 2. Bypass with a capacitor as close as possible to the pin.

Receiver 5 Baseband I-Channel Differential Output

Receiver 5 Baseband Q-Channel Differential Output

Transmitter Baseband I-Channel Differential Input

Transmitter Baseband Q-Channel Differential Input

Receiver 4 Baseband I-Channel Differential Output

Receiver 4 Baseband Q-Channel Differential Output

Active-Low Chip-Select Logic Input of 4-Wire Serial Interface

Receiver 3 Baseband I-Channel Differential Output

Receiver 3 Baseband Q-Channel Differential Output

MAX2851

______________________________________________________________________________________ 21

5GHz, 5-Channel MIMO Receiver

Pin Description (continued)

PIN NAME FUNCTION

43 V

44 BYP_VCO

45 GND_VCO VCO Ground

MAX2851

46 CPOUT+
47 CPOUT­48 V
49 DOUT Data Logic Output of 4-Wire Serial Interface
50 CLKOUT2 Reference Clock Buffer Output 2
51 CLKOUT Reference Clock Buffer Output
52 V
53 XTAL Crystal Oscillator Base Input. AC-couple crystal unit to this pin.
54 XTAL_CAP Crystal Oscillator Emitter Node
55 RSSI Receiver Signal Strength Indicator Output
56 RXBBI2+
57 RXBBI2­58 RXBBQ2+
59 RXBBQ2­60 V
61 RXBBI1+
62 RXBBI1­63 RXBBQ1+
64 RXBBQ1­65 V
66 RXRF1+
67 RXRF1­68 ENABLE Enable Logic Input

— EP

CC_VCO

CC_DIG

CC_XTAL

CC_BB1

CC_LNA1

VCO Supply Voltage. Bypass with a capacitor as close as possible to the pin.

On-Chip VCO Regulator Output Bypass. Bypass with an external 1FF capacitor to GND_VCO with
minimum PCB trace. Do not connect other circuitry to this pin.

Differential Charge-Pump Output. Connect the frequency synthesizer’s loop filter between
CPOUT+ and CPOUT- (see the Typical Operating Circuit).

Digital Block Supply Voltage. Bypass with a capacitor as close as possible to the pin.

Crystal Oscillator Supply Voltage. Bypass with a capacitor as close as possible to the pin.

Receiver 2 Baseband I-Channel Differential Output

Receiver 2 Baseband Q-Channel Differential Output

Receiver Baseband Supply Voltage 1. Bypass with a capacitor as close as possible to the pin.

Receiver 1 Baseband I-Channel Differential Output

Receiver 1 Baseband Q-Channel Differential Output

Receiver 1 LNA Supply Voltage. Bypass with a capacitor as close as possible to the pin.

Receiver 1 LNA Differential Input. Input is DC-coupled and biased internally at 1.2V.

Exposed Paddle. Connect to the ground plane with multiple vias for proper operation and heat
dissipation. Do not share with any other pin grounds and bypass capacitors’ ground.

22 _____________________________________________________________________________________

5GHz, 5-Channel MIMO Receiver

Table 1. Operating Modes

MODE CONTROL

LOGIC INPUTS

MODE

SHUTDOWN

CLOCKOUT

STANDBY

Rx
Tx

Tx CALIBRATION

RF LOOPBACK

BASEBAND
LOOPBACK

Note 1: PA_BIAS pin can be kept active in nontransmit mode(s) by SPI programming.
Note 2: CLKOUT signal is active independent of SPI, and is only dependent on the ENABLE pin.
Note 3: CLKOUT2 signal can be enabled/disabled through SPI in all operating modes except shutdown mode.

ENABLE

PIN

0 XXX Off Off Off Off None
1 000 Off Off Off On None
1 001 Off Off On On None
1 010 On Off On On None
1 011 Off On On On None

1 100 Off On On On

1 101 On (except LNA) On On On RF loopback

1 11X On (except RXRF) Off On On Tx baseband buffer

SPI MAIN

ADDRESS 0,

D[4:2]

Rx PATH

CIRCUIT BLOCK STATES

Tx PATH
(NOTE 1)

LO PATH

CLKOUT

(NOTES 2, 3)

MAX2851

CALIBRATION

SECTIONS ON

AM detector + Rx5

I/Q buffers

Detailed Description

Modes of Operation

The MAX2851 modes of operation are shutdown, clock­out, standby, receive, transmit, transmitter calibration,
RF loopback, and baseband loopback. See Table 1 for
a summary of the modes of operation. The logic input pin
ENABLE (pin 68) and SPI Main address 0 D[4:2] control
the various modes.

Shutdown Mode

The MAX2851 features a low-power shutdown mode. All
circuit blocks are powered down, except the 4-wire serial
bus and its internal programmable registers.

Clockout Mode

In clockout mode, only the crystal oscillator signal is
active at the CLKOUT pin. The rest of the transceiver is
powered down.

Standby Mode

In standby mode, PLL, VCO, and LO generation are on.
Tx or Rx modes can be quickly enabled from this mode.
Other blocks can be selectively enabled in this mode

Receive (Rx) Mode

In receive mode, all Rx circuit blocks are powered on
and active. The antenna signal is applied; RF is down­converted, filtered, and buffered at the RXBB I and Q
outputs.

Transmit (Tx) Mode

In transmit mode, all Tx circuit blocks are powered on
and active. The external PA can be powered on through
the PA_BIAS pin after a programmable delay.

Transmit Calibration Mode

In transmit calibration mode, all Tx circuit blocks are
powered on and active. The AM detector and receiver
I/Q channel buffers are also on. Output signals are
routed to RXBB I and Q outputs.

The AM detector multiplies the Tx RF output signal with
itself. The self-mixing product of the wanted sideband
becomes DC voltage and is filtered on-chip. The mixing
product between wanted sideband and the carrier leak­age forms Ftone at the Rx baseband output. The mixing
product between the wanted sideband and the unwant­ed sideband forms 2Ftone at the Rx baseband output.

As the Tx RF output is self-mixed at the AM detector,
the AM detector output responds differently to different
gain settings and power levels. When the Tx RF output
power changes by 1dB through Tx gain control, the AM
detector output changes by 2dB as both the wanted
sideband and carrier leakage (or unwanted sideband)
change by 1dB. When Tx RF output carrier leakage (or
unwanted sideband) changes by 1dB while the wanted
sideband output power is constant, the AM detector out­put changes by 1dB only.

______________________________________________________________________________________ 23

5GHz, 5-Channel MIMO Receiver

RF Loopback Mode

In RF loopback mode, part of the Rx and Tx circuit
blocks except the LNA are powered on and active. The
transmitter I/Q input signal is upconverted to RF, and the
output of the transmitter is fed to the receiver downcon­verter input. Output signals are delivered to all receiver
baseband I/Q outputs. The I/Q lowpass filters in the
transmitter signal path are bypassed.

MAX2851

Baseband Loopback Mode

In baseband loopback mode, part of the Rx and Tx
baseband circuit blocks are powered and active. The
transmitter I/Q input signal is routed to the receiver low­pass filter input. Output signals are delivered to receiver 5
baseband I/Q outputs.

Power-On Sequence

Set the ENABLE pin to V

for 2ms to start the crystal

CC

oscillator. Program all SPI addresses according to rec­ommended values. Set SPI Main address 0 D[4:2] from
000 to 001 to engage standby mode. To lock the LO
frequency, the user can set SPI in order of Main address
15, Main address 16, and then Main address 17 to trig­ger VCO sub-band autoacquisition; the acquisition takes
2ms. After the LO frequency is locked, set SPI Main
address 0 D[4:2] = 010 and 011 for Rx and Tx operating
modes, respectively. Before engaging to Rx mode, set
Main address 5 D1 = 1 to allow fast DC-offset settling.
After engaging to Rx mode and the Rx baseband DC

offset settles, the user can set Main address 5 D1 = 0 to
complete Rx DC-offset cancellation.

Programmable Registers and

4-Wire SPI Interface

The MAX2851 includes 60 programmable 16-bit reg­isters. The most significant bit (MSB) is the read/write
selection bit (R/W in Figure 1). The next 5 bits are register
address (A[4:0] in Figure 1). The 10 least significant bits
(LSBs) are register data (D[9:0] in Figure 1). Register
data is loaded through the 4-wire SPI/MICROWIREK­compatible serial interface. MSB of data at the DIN pin
is shifted in first and is framed by CS. When CS is low,
the clock is active and input data is shifted at the rising
edge of the clock at the SCLK pin. At CS rising edge,
the 10-bit data bits are latched into the register selected
by the address bits. See Figure 1. To support more than
a 32-register address using a 5-bit-wide address word,
the bit 0 of address 0 is used to select whether the 5-bit
address word is applied to the main address or local
address. There is no power-on SPI register self-reset
functionality in the MAX2851; the user must program all
register values after power-up. During the read mode,
register data selected by address bits is shifted out to
the DOUT pin at the falling edges of the clock.

MICROWIRE is a trademark of National Semiconductor Corp.

t

CSW

CS

SCLK

DIN

(SPI WRITE)

DIN

(SPI READ)

DOUT

(SPI READ)

t

CSO

t

CSS

t

t

DS

A4R/W A0 D9 D0 DON’T CARE

DON’T CARE D9

CH

t

DH

A0 D9 D0A4R/W

t

CL

t

D

t

CSH

t

CS1

DON’T CARE

D0 DON’T CARE

Figure 1. 4-Wire SPI Serial-Interface Timing Diagram

24 _____________________________________________________________________________________

5GHz, 5-Channel MIMO Receiver

SPI Register Definition

All values in the register definition table are typical
numbers. The MAX2851 SPI does not have a power-

on-default self-reset feature; the user must program all
SPI addresses for normal operation. Prior to use of any
untested settings, contact the factory.

Table 2. Register Summary

READ/WRITE AND

D0

ADDRESS

WRITE (W)/

A[4:0]

READ (R)

W/R RESERVED MODE[2:0] RFBW M/L_SEL

Default 0 0 0 0 1 0 0 0 1 0

W/R RESERVED LNA_GAIN[2:0] VGA_GAIN[4:0]

Default 0 0 1 1 1 1 1 1 1 1

W/R RESERVED LNA_BAND[1:0] RESERVED

Default 0 1 1 0 1 0 0 0 0 0

W

R TS_READ[4:0]

Default 0 0 0 0 0 0 0 0 0 0

W/R RESERVED RSSI_MUX_SEL[2:0] RSSI_RX_SEL[2:0] RESERVED RXHP RESERVED

Default 0 0 0 0 0 0 0 0 0 0

W/R RX_GAIN_PROG_SEL[5:1] E_RX[5:1]

Reserved 1 1 1 1 1 1 1 1 1 1

W/R TX_GAIN[5:0] RESERVED

Default 0 0 0 0 0 0 1 1 1 1

W/R RESERVED

Default 0 0 0 1 1 0 0 0 0 0

W/R E_CLKOUT2 RESERVED DOUT_SEL RESERVED

Default 1 1 0 1 1 0 0 0 0 0

W/R

Default 1 0 0 1 0 0 0 0 1 0

W/R SYN_CONFIG_F[19:10]

Default 1 1 1 0 0 0 0 0 0 0

W/R SYN_CONFIG_F[9:0]

Default 0 0 0 0 0 0 0 0 0 0

W/R RESERVED XTAL_TUNE[7:0]

Default 0 0 1 0 0 0 0 0 0 0

D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

TS_

RESERVED TS_EN

VAS_

TRIG_EN

RESERVED SYN_CONFIG_N[6:0]

TRIG

RESERVED

REGISTER

Main 0 0 00000

Main 1 0 00001

Main 2 0 00010

Main 3 0 00011

Main 4 0 00100 Reserved 1 1 0 0 0 1 1 1 0 0

Main 5 0 00101

Main 6 0 00110

Main 7 0 00111 Reserved 0 0 0 0 1 0 0 1 0 0

Main 8 0 01000 W/R 0 0 0 0 0 0 0 0 0 0

Main 9 0 01001

Main 10 0 01010 Reserved 0 0 0 0 0 0 0 0 0 0

Main 11 0 01011

Main 13 0 01101 Reserved 0 0 0 0 0 0 0 0 0 0

Main 14 0 01110

Main 15 0 01111

Main 16 0 10000

Main 17 0 10001

Main 18 0 10010

MAIN0_

DATA

RESERVED

MAX2851

______________________________________________________________________________________ 25

5GHz, 5-Channel MIMO Receiver

Table 2. Register Summary (continued)

READ/WRITE AND

D0

ADDRESS

WRITE (W)/

A[4:0]

READ (R)

W/R RESERVED

Read RESERVED VAS_ADC[2:0] VCO_BAND[5:0]

Default 0 0 0 1 0 1 1 1 1 1

Read RESERVED DIE_ID[2:0] RESERVED

Default 0 0 1 0 1 1 1 1 1 1

W/R

Default 0 1 1 0 0 0 0 0 0 0

W/R RESERVED PA_BIAS_DLY[3:0]

Default 0 0 0 1 1 0 0 0 1 1

W/R RFDET_MUX_SEL[2:0] RESERVED

Reserved 1 1 1 0 0 0 0 0 0 0

D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

VAS_

SEL

VAS_

MODE

VAS_VCO_

DIE_ID_

READ

RELOCK_

RESERVED

REGISTER

MAIN0_

MAX2851

Main 19 0 10011

Main 20 0 10100 Reserved 0 1 1 1 1 0 1 0 1 0

Main 21 0 10101

Main 22 0 10110 Reserved 0 1 1 0 1 1 1 0 0 0

Main 23 0 10111 Reserved 0 0 0 1 1 0 0 1 0 1

Main 24 0 11000 Reserved 1 0 0 1 0 0 1 1 1 1

Main 25 0 11001 Reserved 1 1 1 0 1 0 1 0 0 0

Main 26 0 11010 Reserved 0 0 0 0 0 1 0 1 0 1

Main 27 0 11011

Main 28 0 11100

Main 29 0 11101 Reserved 0 0 0 0 0 0 0 0 0 0

Main 30 0 11110 Reserved 0 0 0 0 0 0 0 0 0 0

Main 31 0 11111 Reserved 0 0 0 0 0 0 0 0 0 0

Local 1 1 00001 Reserved 0 0 0 0 0 0 0 0 0 0

Local 2 1 00010 Reserved 0 0 0 0 0 0 0 0 0 0

Local 3 1 00011 Reserved 0 0 0 0 0 0 0 0 0 0

Local 4 1 00100

Local 5 1 00101 Reserved 0 0 0 0 0 0 0 0 0 0

Local 6 1 00110 Reserved 0 0 0 0 0 0 0 0 0 0

Local 7 1 00111 Reserved 0 0 0 0 0 0 0 0 0 0

Local 8 1 01000 Reserved 0 1 1 0 1 0 1 0 1 0

Local 9 1 01001 Reserved 0 1 0 0 0 1 0 1 0 0

Local 10 1 01010 Reserved 1 1 0 1 0 1 0 1 0 0

Local 11 1 01011 Reserved 0 0 0 1 1 1 0 0 1 1

Local 12 1 01100 Reserved 0 0 0 0 0 0

Local 13 1 01101 Reserved 0 0 0 0 0 0 0 0 0 0

Local 14 1 01110 Reserved 0 0 0 0 0 0 0 0 0 0

Local 15 1 01111 Reserved 0 0 0 0 0 0 0 0 0 0

Local 16 1 10000 Reserved 0 0 0 0 0 0 0 0 0 0

Local 17 1 10001 Reserved 0 0 0 0 0 0 0 0 0 0

READ

DATA

VAS_SPI[5:0]

RESERVED

0 0 0 0

26 _____________________________________________________________________________________

5GHz, 5-Channel MIMO Receiver

Table 2. Register Summary (continued)

READ/WRITE AND

D0

ADDRESS

WRITE (W)/

A[4:0]

READ (R)

W/R RESERVED

Default 0 0 0 0 0 0 0 0 0 0

D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

REGISTER

Local 18 1 10010 Reserved 0 0 0 0 0 0 0 0 0 0

Local 19 1 10011 Reserved 0 0 0 0 0 0 0 0 0 0

Local 20 1 10100 Reserved 0 0 0 0 0 0 0 0 0 0

Local 21 1 10101 Reserved 0 0 0 0 0 0 0 0 0 0

Local 22 1 10110 Reserved 0 0 0 0 0 0 0 0 0 0

Local 23 1 10111 Reserved 0 0 0 0 0 0 0 0 0 0

Local 24 1 11000 Reserved 0 0 1 1 0 0 0 1 0 0

Local 25 1 11001 Reserved 0 1 0 0 1 0 1 0 1 1

Local 26 1 11010 Reserved 0 1 0 1 1 0 0 1 0 1

Local 27 1 11011

Local 28 1 11100 Reserved 0 0 0 0 0 0 0 1 0 0

Local 31 1 11111 Reserved 0 0 0 0 0 0 0 0 0 0

MAIN0_

DATA

TX_AMD_

BB_GAIN

TX_AMD_

RF_GAIN

MAX2851

______________________________________________________________________________________ 27

5GHz, 5-Channel MIMO Receiver

Table 3. Main Address 0 (A[4:0] = 00000)

BIT NAME

RESERVED D[9:5] Reserved bits—set to default.

MAX2851

MODE[2:0] D[4:2]

RFBW D1

M/L_SEL D0

Table 4. Main Address 1 (A[4:0] = 00001, Main Address 0 D0 = 0)

BIT NAME

RESERVED D[9:8] Reserved bits—set to default.

LNA_GAIN[2:0]

BIT LOCATION

(D0 = LSB)

BIT LOCATION

(D0 = LSB)

D[7:5]

DESCRIPTION

IC operating mode select.
000 = Clockout (default)
001 = Standby
010 = Rx
011 = Tx
100 = Tx calibration
101 = RF loopback
11x = Baseband loopback

RF bandwidth.
0 = 20MHz
1 = 40MHz (default)

Main or local address select.
0 = Main registers (default)
1 = Local registers

DESCRIPTION

LNA gain control. Active when Rx channel is selected by correspond­ing RX_GAIN_PROG_SEL[5:1] bits in Main address 6 D[9:5].
000 = Max - 40dB
001 = Max - 32dB
100 = Max - 24dB (not tested, contact factory for coverage)
101 = Max - 16dB
110 = Max - 8dB
111 = Max gain (default)

Rx VGA gain control. Active when Rx channel is selected by corre­sponding RX_GAIN_PROG_SEL[5:1] bits in Main address 6 D[9:5].
00000 = Min gain
00001 = Min + 2dB

VGA_GAIN[4:0] D[4:0]

28 _____________________________________________________________________________________

…
01110 = Min + 28dB
01111 = Min + 30dB
…
1xxxx = Min + 30dB (default)

5GHz, 5-Channel MIMO Receiver

Table 5. Main Address 2 (A[4:0] = 00010, Main Address 0 D0 = 0)

BIT NAME

RESERVED D[9:7], D[4:0] Reserved bits—set to default.

LNA_BAND[1:0] D[6:5]

Table 6. Main Address 3 (A[4:0] = 00011, Main Address 0 D0 = 0)

BIT NAME

RESERVED D[9:8], D5 Reserved bits—set to default.

TS_EN D7

TS_TRIG D6

TS_READ[4:0]

(Readback Only)

BIT LOCATION

(D0 = LSB)

LNA frequency band switch.
00 = 4.9GHz~5.2GHz
01 = 5.2GHz~5.5GHz (default)
10 = 5.5GHz~5.8GHz
11 = 5.8GHz~5.9GHz

BIT LOCATION

(D0 = LSB)

Temperature sensor enable.
0 = Disable (default)
1 = Enable except shutdown or clockout mode

Temperature sensor reading trigger.
0 = Not trigger (default)
1 = Trigger temperature reading

D[4:0] SPI readback only. Temperature sensor reading.

DESCRIPTION

DESCRIPTION

MAX2851

Table 7. Main Address 5 (A[4:0] = 00101, Main Address 0 D0 = 0)

BIT NAME

RESERVED D9, D2, D0 Reserved bits—set to default.

RSSI_MUX_SEL[2:0] D[8:6]

______________________________________________________________________________________ 29

BIT LOCATION

(D0 = LSB)

DESCRIPTION

RSSI output select.
000 = Baseband RSSI (default)
001 = Do not use
010 = Do not use
011 = Do not use
100 = Rx RF detector
101 = Do not use
110 = PA power-detector mux output
111 = Do not use

5GHz, 5-Channel MIMO Receiver

Table 7. Main Address 5 (A[4:0] = 00101, Main Address 0 D0 = 0) (continued)

BIT NAME

MAX2851

RSSI_RX_SEL[2:0] D[5:3]

RXHP D1

Table 8. Main Address 6 (A[4:0] = 00110, Main Address 0 D0 = 0)

BIT NAME

RX_GAIN_PROG_SEL

[5:1]

BIT LOCATION

(D0 = LSB)

BIT LOCATION

(D0 = LSB)

D[9:5]

DESCRIPTION

Baseband RSSI Rx channel select.
000 = Not select (default)
001 = Rx1
010 = Rx2
011 = Rx3
100 = Rx4
101 = Rx5
110 = Do not use
111 = Do not use

Rx VGA highpass corner select after Rx turn-on. RXHP starts at 1 dur­ing Rx gain adjustment and set 0 after gain is adjusted.
0 = 10kHz highpass corner after Rx gain is adjusted (default)
1 = 600kHz highpass corner during Rx gain adjustment

DESCRIPTION

Rx channel gain programming select. Select which Rx channels are to be
changed; gain is then determined by programming Main address 1 D[7:0].
D9 selects Rx5, D8 selects Rx4, etc.
0 = Not selected
1 = Selected
1111 = Default

Rx MIMO channel select. Enable Rx channels independently.
D4 selects Rx5, D3 selects Rx4, etc.

E_RX[5:1] D[4:0]

0 = Not selected
1 = Select in Rx, RF loopback, or Tx calibration mode
11111 = Default

Table 9. Main Address 9 (A[4:0] = 01001, Main Address 0 D0 = 0)

BIT NAME

TX_GAIN[5:0] D[9:4]

RESERVED D[3:0] Reserved bits—set to default.

30 _____________________________________________________________________________________

BIT LOCATION

(D0 = LSB)

DESCRIPTION

Tx VGA gain control. Tx channel is selected by Main address 9 D[3:0].
000000 = Min gain (default)
…
111111 = Min gain + 31.5dB

5GHz, 5-Channel MIMO Receiver

Table 10. Main Address 14 (A[4:0] = 01110, Main Address 0 D0 = 0

BIT NAME

E_CLKOUT2 D9

RESERVED D[8:2], D1 Reserved bits—set to default.

DOUT_SEL D1

Table 11. Main Address 15 (A[4:0] = 01111, Main Address 0 D0 = 0)

BIT NAME

VAS_TRIG_EN D9

RESERVED D[8:7] Reserved bits—set to default.

SYN_CONFIG_N[6:0] D[6:0]

BIT LOCATION

(D0 = LSB)

BIT LOCATION

(D0 = LSB)

DESCRIPTION

CLKOUT2 enable.
0 = Disable
1 = Enable except during shutdown mode (default)

DOUT pin output select.
0 = PLL lock detect (default)
1 = SPI readback

DESCRIPTION

Enable VCO sub-band acquisition triggerred by SYN_CONFIG_F[9:0]
(Main address 17) programming.
0 = Disable for small frequency adjustment (i.e., ~100kHz).
1 = Enable for channel switching (default)

Integer divide ratio.
1000010 = Default

MAX2851

Table 12. Main Address 16 (A[4:0] = 10000, Main Address 0 D0 = 0)

BIT NAME

SYN_CONFIG_F[19:10] D[9:0]

BIT LOCATION

(D0 = LSB)

DESCRIPTION

Fractional divide ratio MSBs.
1110000000 = Default

Table 13. Main Address 17 (A[4:0] = 10001, Main Address 0 D0 = 0)

BIT NAME

SYN_CONFIG_F[9:0] D[9:0]

BIT LOCATION

(D0 = LSB)

DESCRIPTION

Fractional divide ratio LSBs.
0000000000 = Default

Table 14. Main Address 18 (A[4:0] = 10010, Main Address 0 D0 = 0)

BIT NAME

RESERVED D[9:8] Reserved bits—set to default.

XTAL_TUNE[7:0] D[7:0]

BIT LOCATION

(D0 = LSB)

DESCRIPTION

Crystal oscillator frequency tuning.
00000000 = Min frequency
10000000 = Default
11111111 = Max frequency

______________________________________________________________________________________ 31

5GHz, 5-Channel MIMO Receiver

Table 15. Main Address 19 (A[4:0] = 10011, Main Address 0 D0 = 0)

BIT NAME

RESERVED D[9:8] Reserved bits—set to default.

VAS_RELOCK_SEL D7

MAX2851

VAS_MODE D6

VAS_SPI[5:0] D[5:0]

VAS_ADC[2:0]

(Readback Only)

VCO_BAND[5:0]

(Readback Only)

BIT LOCATION

(D0 = LSB)

D[8:6]

D[5:0]

DESCRIPTION

VAS relock select.
0 = Start at sub-band selected by VAS_SPI[5:0] (Main address 19
D5:D0) (default)
1 = Start at current sub-band

VCO sub-band select.
0 = By VAS_SPI[5:0] (Main address 19 D[5:0])
1 = By on-chip VCO autoselect (VAS) (default)

VCO autoselect sub-band input. Select VCO subband when VAS_
MODE (Main address 19 D6) = 0. Select initial VCO sub-band for auto­acquisition when VAS_MODE = 1.
000000 = Min frequency sub-band
…
011111 = Default
…
111111 = Max frequency sub-band

Read VCO autoselect tune voltage ADC output. Active when VAS_
VCO_READ (Main address 27 D5) = 1.
000 = Lower than lock range and at risk of unlock
001 = Lower than acquisition range and maintain lock
010 or 101 = Within acquisition range and maintain lock
110 = Higher than acquisition range and maintain lock
111 = Higher than lock range and at risk of unlock

Read the current acquired VCO sub-band by VCO autoselect. Active
when VAS_VCO_READ (Main address 27 D5) = 1.

Table 16. Main Address 21 (A[4:0] = 10101, Main Address 0 D0 = 0)

BIT NAME

RESERVED D[9:8], D[4:0] Reserved bits—set to default.

DIE_ID[2:0]

(Readback Only)

32 _____________________________________________________________________________________

BIT LOCATION

(D0 = LSB)

D[7:5]

DESCRIPTION

Read revision ID at Main address 21 D[7:5].
Active when DIE_ID_READ (Main address 27 D9) = 1.
000 = Pass1
001 = Pass2
…

5GHz, 5-Channel MIMO Receiver

Table 17. Main Address 27 (A[4:0] = 11011, Main Address 0 D0 = 0)

BIT NAME

DIE_ID_READ D9

RESERVED D[8:6], D[4:0] Reserved bits—set to default.

VAS_VCO_READ D5

Table 18. Main Address 28 (A[4:0] = 11100, Main Address 0 D0 = 0)

BIT NAME

RESERVED D[9:4] Reserved bits—set to default.

PA_BIAS_DLY[3:0]

BIT LOCATION

(D0 = LSB)

BIT LOCATION

(D0 = LSB)

D[3:0]

DESCRIPTION

Die ID readback select.
0 = Main address 21 D[9:0] reads its own values (default)
1 = Main address 21 D[7:5] reads revision ID

VAS ADC and VCO sub-band readback select.
0 = Main address 19 D[9:0] reads its own values (default)
1 = Main address 19 D[8:6] reads VAS_ADC[2:0]; Main address 19
D[5:0] reads VCO_BAND[5:0]

DESCRIPTION

PA_BIAS turn-on delay.
0000 = 0Fs
0001 = 0Fs
0010 = 0.5Fs
0011 = 1.0Fs (default)
…
1111 = 7.0Fs
Only default is tested; contact factory for test coverage.

MAX2851

______________________________________________________________________________________ 33

5GHz, 5-Channel MIMO Receiver

Table 19. Local Address 4 (A[4:0] = 00100, Main Address 0 D0 = 1)

BIT NAME

MAX2851

RFDET_MUX_SEL[2:0] D[9:7]

RESERVED D[6:0] Reserved bits—set to default.

BIT LOCATION

(D0 = LSB)

DESCRIPTION

RF RSSI channel selection.
000 = Rx1
001 = Rx2
010 = Rx3
011 = Rx4
100 = Rx5
101 = Do not use
110 = Do not use
111 = Not selected (default)

Table 20. Local Address 27 (A[4:0] = 11011, Main Address 0 D0 = 1)

BIT NAME

RESERVED D[9:3] Reserved bits—set to default.

TX_AMD_BB_GAIN D2

TX_AMD_RF_GAIN D[1:0]

BIT LOCATION

(D0 = LSB)

DESCRIPTION

Tx calibration AM detector baseband gain.
0 = Minimum gain (default)
1 = Minimum gain + 5dB

Tx calibration AM detector RF gain.
00 = Minimum gain (default)
01 = Minimum gain + 14dB rise at output
1x = Minimum gain + 28dB rise at output

34 _____________________________________________________________________________________

5GHz, 5-Channel MIMO Receiver

Typical Operating Circuit

RXRF1

RXRF2

RXRF3

RXRF4

OUTPUT

INPUT

INPUT

INPUT

INPUT

22pF

ENABLE

68 67

+

GND

1

V

CC_LNA2

2

1:2

22pF

1:2

22pF

1:2

22pF

VCC_UCX

0.75pF

TXRF

1:2

2.2nH

1nF

1nF

RXRF2-

RXRF2+

V

CC_MXR1

1nF

V

CC_LNA3

1nF

RXRF3-

RXRF3+

V

CC_MXR2

1nF

PA_DET

47pF

RXRF4-

RXRF4+

V

CC_LNA4

1nF

PA_BIAS

TXRF+

TXRF-

V

CC_PA_BIAS

1nF

TXRF

3

4

5

TXRF

6

7

8

TXRF

9

10

11

TXRF

12

TXRFQ

13

AM DETECTOR

AMD

14

15

16

17

TXRF

1:2

1nF

CC_LNA1

RXBBQ1-

RXBBQ1+

RXRF1-

RXRF1+

V

66 65 64 63 62 61 60 59 58 57 56 55 54 53 52

LNA1

Q

LNA2

Q

LNA3

Q

90˚

0˚

LNA4

Q

LNA5

LPF1/Q5

Q

RXBBI1-

LPF1/Q1

LPF1/Q2

LPF1/Q3

LPF1/Q4

0˚

90˚

AMD

0.1µF

CC_BB1

RXBBQ2-

RXBBQ2+

RXBBI2-

RXBBI1+

V

RXBBI2+

6.6pF

RSSI

RSSI MAX

BB

RF

RSSI

RSSI

LNA1-5 LPF1/Q1-5

MAX2851

40MHz

XTAL_CAP

PA_DET

XTAL

39pF

DOUT

1nF

XTAL

CRYSTAL

OSCILLATOR/

BUFFER

PHASE-LOCKED

LOOP

SERIAL

INTERFACE

CC_XTAL

V

1.0µF

CLKOUT

51

CLKOUT2

50

DOUT

49

V

CC_DIG

48

380I

CPOUT-

47

33pF

380

I

CPOUT+

46

GND_VCO

45

BYP_VCO

44

V

CC_VCO

43

RXBBQ3-

42

RXBBQ3+

41

RXBBI3-

40

RXBBI3+

39

DIN

38

SCLK

37

CS

36

RXBBQ4-

35

1nF

PLL LOOP FILTER

2.2nF

0.1µF

1µF

MAX2851

18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

CC_UCX

V

RXRF5-

CC_LNA5

V

1nF

1nF

22pF

RXRF5+

RXRF5
INPUT

GND

CC_BB2

V

1:2

RXBBI5-

RXBBI5+

0.1µF

RXBBQ5+

RXBBQ5-

TXBBI-

TXBBI+

TXBBQ-

TXBBQ+

RXBBI4-

RXBBI4+

RXBBQ4+

______________________________________________________________________________________ 35

5GHz, 5-Channel MIMO Receiver

Chip Information

PROCESS: BiCMOS

MAX2851

Package Information

For the latest package outline information and land patterns,
go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package
drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.

PACKAGE TYPE PACKAGE CODE DOCUMENT NO.

68 TQFN-EP T6800+2

21-0142

36 _____________________________________________________________________________________

5GHz, 5-Channel MIMO Receiver

Revision History

MAX2851

REVISION

NUMBER

0 1/10 Initial release —
1 3/10 Modified EC table to support single-pass room test flow 2, 3, 5, 6–9

REVISION

DATE

DESCRIPTION

PAGES

CHANGED

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 37

©

2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.