MAXIM MAX2850 Technical data

19-5009; Rev 1; 3/10

5GHz, 4-Channel MIMO Transmitter

General Description

The MAX2850 is a single-chip, 4-channel RF transmitter
IC designed for 5GHz wireless HDMI applications. The
IC includes all circuitry required to implement the com­plete 4-channel MIMO RF transmitter function and crys­tal oscillator, providing a fully integrated transmit 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. Dynamic on/off control
of four external PAs is implemented with programmable
precision voltages. A 4-to-1 analog mux routes external
PA power-detect voltages to the RSSI pin.

On-chip monolithic filters are included for transmitter I/Q
baseband signal reconstruction to support both 20MHz
and 40MHz RF channels. The baseband filtering and
Tx signal paths are optimized to meet stringent WHDI
requirements. The upconverter local oscillator is coher­ent among all the transmitter channels.

The reverse-link control channel uses an on-chip 5GHz
OFDM receiver. It shares the RF synthesizer and LO gen­eration circuit with the MIMO transmitters. The receiver
includes both an in-channel RSSI and an RF RSSI.

The MIMO transmitter chip is housed in a small, 68-pin
thin QFN leadless plastic package with exposed pad.

Applications

5GHz Wireless HDMI (WHDI)

5GHz FDD Backhaul and WiMax™

5GHz MIMO Transmitter Up to Four Spatial
Streams

5GHz Beam Steering Transmitter

Features

S 5GHz 4x MIMO Downlink Transmitters, Single

Uplink IEEE 802.11a Receiver

4900MHz to 5900MHz Frequency Range

-5dBm Transmit Power (54Mbps OFDM)
Coherent LO Among Transmitters
31dB Tx Gain-Control Range with 0.5dB Step

Size, Digitally Controlled

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

Adjustment

Programmable 20MHz/40MHz Tx I/Q Lowpass

Anti-Aliasing Filter

4-to-1 Analog Mux for PA Power Detect
4-Channel PA On/Off Control

4.5dB Rx Noise Figure
70dB Rx Gain-Control Range with 2dB Step

Size, Digitally Controlled

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

Channel Filters

Sigma-Delta Fractional-N PLL with 76Hz

Resolution

Monolithic Low-Noise VCO with -35dBc

Integrated Phase Noise

4-Wire SPI™
I/Q Analog Baseband Interface
Digital Tx/Rx Mode Control
On-Chip Digital Temperature Sensor Readout
Complete Baseband Interface
Digital Tx/Rx Mode Control

S

+2.7V to +3.6V Supply Voltage

S

Small, 68-Pin Thin QFN Package (10mm x 10mm)

Digital Interface

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX2850ITK+

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

-25NC to +85NC

68 Thin QFN-EP*

MAX2850

WiMax is a trademark of WiMax Forum.
SPI is a trademark of Motorola, Inc.

_______________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuit appears at end of data sheet.

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.

5GHz, 4-Channel MIMO Transmitter

ABSOLUTE MAXIMUM RATINGS

V

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

CC_

RF Inputs Maximum Current: RXRF+, RXRF-

to GND ................................................................-1mA to +1mA

RF Outputs: TXRF1+, TXRF1-, TXRF2+, TXRF2-,

TXRF3+, TXRF3-, TXRF4+, TXRF4- to GND .....-0.3V to +3.9V

Analog Inputs: TXBB1I+, TXBB1I-, TXBB1Q+,

TXBB1Q-, TXBB2I+, TXBB2I-, TXBB2Q+,
TXBB2Q-, TXBB3I+, TXBB3I-, TXBB3Q+, TXBB3Q-,

MAX2850

TXBB4I+, TXBB4I-, TXBB4Q+, TXBB4Q-, PA_DET1,

PA_DET2, PA_DET3, PA_DET4, XTAL,

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

Analog Outputs: RXBBI+, RXBBI-, RXBBQ+,

RXBBQ-, RSSI, CLKOUT2, VCOBYP, CPOUT+,

CPOUT-, PA_BIAS1, PA_BIAS2,

PA_BIAS3, PA_BIAS4 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: VCC = 2.7V~3.6V, ENABLE set according to operating mode, CS = high, SCLK
= DIN = low, transmitter in maximum gain, T
using the Typical Operating Circuit. 100mV
mode. Typical values measured at V
40MHz. PA control pins open circuit, V

PARAMETERS CONDITIONS MIN TYP MAX UNITS

Supply Voltage, 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

CC

Shutdown mode

Clock-out only mode

Standby mode 60 89

Transmit mode

Receive mode 135 174

Transmit calibration mode

Receive calibration mode 268 327

= -25NC to +85NC. Power matching and termination for the differential RF output pins

A

differential I and Q signals applied to I/Q baseband inputs of transmitters in transmit

RMS

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

CC_PA_BIAS

is disconnected.) (Note 1)

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 Thin QFN (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

T

A

XTAL oscillator, load =
10pF

TCXO input, load =
10kI||10pF

One transmitter is on 188 235
Four transmitters are on 505 661

One transmitter is on 214 261
Four transmitters are on 532 686

= +85NC)

A

2.7 3.6 V
10

3

7.4 11

0.9 1.1 1.3 V

0.5 1.1 V

FA

mA

FA

2 ______________________________________________________________________________________

5GHz, 4-Channel MIMO Transmitter

DC ELECTRICAL CHARACTERISTICS (continued)

(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, ENABLE set according to operating mode, CS = high, SCLK
= DIN = low, transmitter in maximum gain, T
using the Typical Operating Circuit. 100mV
mode. Typical values measured at V
40MHz. PA control pins open circuit, V

PARAMETERS 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

IL

IH

IL

CC

IH

Sourcing 1mA

OH

Sinking 1mA 0.4 V

OL

Sinking 1mA V

AC ELECTRICAL CHARACTERISTICS—Rx MODE

(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, RF frequency = 5.351GHz, TA = -25NC to +85NC. LO frequency
= 5.35GHz. Reference frequency = 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
resistance and 10pF load capacitance. The RSSI pin is loaded with 10kI load resistance to ground. Typical values measured at V
= 2.85V, channel bandwidths of 40MHz, T

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 5.35GHz 0.3 2.6

5.35GHz to 5.9GHz 2.2 5.3

Maximum gain; Main address 1 D7:0 = 11111111 61 68
Minimum gain; Main address 1 D7:0 = 00000000 -2 +5
Main address 1 D7:D5 = 110 -8
Main address 1 D7:D5 = 101 -16
Main address 1 D7:D5 = 001 -32
Main address 1 D7:D5 = 000 -40

From maximum baseband gain (Main address 1 D3:D0
= 1111) to minimum baseband gain (Main address 1
D3:D0 = 0000)

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

= -25NC to +85NC. Power matching and termination for the differential RF output pins

A

differential I and Q signals applied to I/Q baseband inputs of transmitters in transmit

RMS

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

CC_PA_BIAS

A

is disconnected.) (Note 1)

= +25NC.) (Note 1)

VCC -

0.4

0.3 V

-1 +1

-1 +1

-

V

CC

0.4

OL

loaded with 10kI differential load

RMS

27.5 30 32.5 dB

400 ns

V

FA
FA

V

V

dB

dB

dB

CC

MAX2850

_______________________________________________________________________________________ 3

5GHz, 4-Channel MIMO Transmitter

AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued)

(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, RF frequency = 5.351GHz, TA = -25NC to +85NC. LO frequency
= 5.35GHz. Reference frequency = 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
resistance and 10pF load capacitance. The RSSI pin is loaded with 10kI load resistance to ground. Typical values measured at V
= 2.85V, channel bandwidths of 40MHz, T

PARAMETER CONDITIONS MIN TYP MAX UNITS

Baseband Gain-Change Settling

MAX2850

Time

DSB Noise Figure

Out-of-Band Input IP3

1dB Gain Desensitization by
Alternate Channel Blocker

Input 1dB Gain Compression

Output 1dB Gain Compression

= +25NC.) (Note 1)

A

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 D7:D5 = 111) -32
Max RF gain - 8dB (Main address 1 D7:D5 = 110) -24
Max RF gain - 16dB (Main address 1 D7:D5 = 101) -16
Max RF gain - 32dB (Main address 1 D7:D5 = 001) 0

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

Maximum RF gain (Main
address 1 D7:D5 = 111)

Maximum RF gain - 16dB
(Main address 1 D7:D5 = 101)

Maximum RF gain (Main
address 1 D7:D5 = 111)

Maximum RF gain - 16dB
(Main address 1 D7:D5 = 101)

-65dBm wanted signal; RF
gain = max (Main address 1
D7:D0 = 11101001)

-49dBm wanted signal; RF
gain = max - 16dB (Main
address 1 D7:D0 = 10101001)

-45dBm wanted signal; RF
gain = max - 32dB (Main
address 1 D7:D0 = 00111111)

-65dBm wanted signal; RF
gain = max (Main address 1
D7:D0 = 11101001)

-49dBm wanted signal; RF
gain = max - 16dB (Main
address 1 D7:D0 = 10101001)

-45dBm wanted signal; RF
gain = max - 32dB (Main
address 1 D7:D0 = 00101001)

loaded with 10kI differential load

RMS

200 ns

4.5

15

4.5

15

-13

-5

11

-13

-5

11

-24

-24

0.63 V

dB

dBm

dBm

dBm

P-P

CC

4 ______________________________________________________________________________________

5GHz, 4-Channel MIMO Transmitter

AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued)

(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, RF frequency = 5.351GHz, TA = -25NC to +85NC. LO frequency
= 5.35GHz. Reference frequency = 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
resistance and 10pF load capacitance. The RSSI pin is loaded with 10kI load resistance to ground. Typical values measured at V
= 2.85V, channel bandwidths of 40MHz, T

PARAMETER CONDITIONS MIN TYP MAX UNITS

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 degrees
Sideband Suppression 1MHz baseband output (Note 2) 40 dB

Receiver Spurious Signal
Emissions

RF RSSI Output Voltage -20dBm input power 1.75 V
Baseband RSSI Slope 19.5 26.5 35.5 mV/dB

Baseband RSSI Maximum Output
Voltage

Baseband RSSI Minimum Output
Voltage

RF Loopback Conversion Gain

= +25NC.) (Note 1)

A

Main address 0 D1 = 0 9.5
Main address 0 D1 = 1 19
Rejection at 30MHz offset frequency for 20MHz channel 57 70
Rejection at 60MHz offset frequency for 40MHz channel 57 70
Main address 5 D1 = 1 600
Main address 5 D1 = 0 10

50Fs after enabling receive mode and toggling 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
2 x LO frequency -62
3 x LO frequency -75
4 x LO frequency -60

Tx VGA gain at maximum (Main address 9 D9:D4
= 111111); Rx VGA gain at maximum - 24dB (Main
address 1 D3:D0 = 0101)

, at any given gain set-

RMS

loaded with 10kI differential load

RMS

2 mV

2.3 V

0.5 V

-6 +2 +10 dB

CC

MHz

dB

kHz

dBm/

MHz

MAX2850

AC ELECTRICAL CHARACTERISTICS—Tx MODE

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

RF Output Frequency Range 4.9 5.9 GHz

Peak-to-Peak Gain Variation over
RF Band

_______________________________________________________________________________________ 5

At one temperature 3 6.4 dB

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

RMS

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

CC

5GHz, 4-Channel MIMO Transmitter

AC ELECTRICAL CHARACTERISTICS—Tx MODE (continued)

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

PARAMETER CONDITIONS MIN TYP MAX UNITS

20MHz OFDM signal conforming to spectral emission

MAX2850

Maximum Output Power

Output 1dB Gain Compression

Input 1dB Gain Compression

Gain-Control Range 26 31.5 34.5 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 Gain Range Adjust Local address 27 D2:D0 35 dB

mask and -34dB EVM

40MHz OFDM signal conforming 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 2)

Over RF channel, RF frequency, and gain settings
(Note 2)

Minimum differential resistance 60
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 D9:D4) = 100010 and

-15dBc carrier leakage (Local address 27 D2:D0 = 110
and Main address 1 D3:D0 = 0000)

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

RMS

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

CC

-4

-4

11 dBc

380 mV

-40 dBc

-29 -15 dBc

-28 dBV

dBm

RMS

kI

dB

RMS

AC ELECTRICAL CHARACTERISTICS—FREQUENCY SYNTHESIS

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

5.35GHz, T

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

6 ______________________________________________________________________________________

= +25NC.) (Note 1)

A

PARAMETER CONDITIONS MIN TYP MAX UNITS

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

f

= 0 to 19MHz -42

OFFSET

= 40MHz -66

f

OFFSET

= 2.85V, LO frequency =

CC

76.294 Hz

-35 dBc

dBc

5GHz, 4-Channel MIMO Transmitter

AC ELECTRICAL CHARACTERISTICS—FREQUENCY SYNTHESIS (continued)

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

PARAMETER CONDITIONS MIN TYP MAX UNITS

Reference Frequency Input
Levels

Maximum Crystal Motional
Resistance

Crystal Capacitance Tuning
Range

Crystal Capacitance Tuning Step 140 fF

CLKOUT Signal Level 10pF load capacitance

AC-coupled to XTAL pin 800 mV

Base-to-ground capacitance 30 pF

= 2.85V, TA = +25NC, LO fre-

CC

50

-

V

CC

0.8

VCC -

0.1

P-P

I

V

P-P

AC ELECTRICAL CHARACTERISTICS—MISCELLANEOUS BLOCKS

(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, TA = -25NC to +85NC. Reference frequency = 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

Input Voltage Range 3.1 3.6 V

V

CC_PA

Supply Current With 10mA load at PA_BIAS1 to PA_BIAS4 42 mA

V

CC_PA

Output High Level 10mA load current, Main address 11 D7:5 = 011 2.8 V

Output High-Level Variation
Between PA_BIAS1 to PA_BIAS4

Output Low Level 1mA load current, Main address 11 D7:5 = 011 25 mV
Turn-On Time

ON-CHIP TEMPERATURE SENSOR

Digital Output Code

= 2V, load resistance = 10kI to ground

V

IN

Measured from CS rising edge

Read-out at DOUT pin through
Main address 3 D4:D0

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

CC

= +25NC

T

A

T

= +85NC

A

T

= -20NC

A

11 30 mV

30 mV

0.3

17
25

9

Fs

MAX2850

AC ELECTRICAL CHARACTERISTICS—TIMING

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

5.35GHz, T

SYSTEM TIMING

Shutdown Time 2 Fs

Maximum Channel Switching
Time

Maximum Channel Switching
Time With Preselected VCO
Sub-Band

= +25NC.) (Note 1)

A

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

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

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

_______________________________________________________________________________________ 7

= 2.85V, LO frequency =

CC

2 ms

56 Fs

5GHz, 4-Channel MIMO Transmitter

AC ELECTRICAL CHARACTERISTICS—TIMING (continued)

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

= +25NC.) (Note 1)

A

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Rx to Tx mode, Tx gain settles

MAX2850

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)

4-WIRE SERIAL-INTERFACE TIMING (See 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

SCLK Falling Edge to Valid
DOUT

Note 1: The MAX2850 is production tested at T

specified otherwise. 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: 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

t

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

6 ns

R

F

D

= +25NC; minimum/maximum limits at TA = +25NC are guaranteed by test, unless

A

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, LO frequency = 5.35GHz,

CC

2

2

2

0.1

2

0.1

6 ns

6 ns

6 ns
6 ns
6 ns
6 ns

50 ns

6 ns

40 MHz

2.5 ns

2.5 ns

12.5 ns

Fs

Fs

Fs

Fs

Fs

8 ______________________________________________________________________________________

5GHz, 4-Channel MIMO Transmitter

Rx EVM vs. Rx BASEBAND

Typical Operating Characteristics

(VCC = 2.8V, f
balun, T

= +25NC, using the MAX2850 Evaluation Kit.)

A

141

140

139

138

137

136

135

SUPPLY CURRENT (mA)

134

133

132

2.6 3.6

71

70

69

68

67

66

65

MAXIMUM GAIN (dB)

64

63

62

4.9 5.9

-15

-20

-25

LNA = MAX = -8dB

EVM (dB)

-30

LNA = MAX = -16dB

-35

-40

-90 10

= 5.35GHz, f

LO

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

REF

Rx MODE SUPPLY CURRENT

TA = +85°C

TA = -20°C

TA = +25°C

3.53.43.2 3.32.8 2.9 3.0 3.12.7

SUPPLY VOLTAGE (V)

Rx MAXIMUM GAIN vs.

TEMPERATURE AND FREQUENCY

TA = -20°C

TA = +25°C

TA = +85°C

5.75.55.35.1

FREQUENCY (GHz)

Rx EVM vs. INPUT POWER

(CHANNEL BANDWIDTH = 20MHz)

LNA = MAX

LNA = MAX = -40dB

LNA = MAX = -24dB

INPUT POWER (dBm)

LNA = MAX = -32dB

-10-30-50-70

MAX2850 toc01

MAX2850 toc04

MAX2850 toc07

Rx NOISE FIGURE vs. VGA GAIN

SETTINGS (BALUN INPUT REFERRED)

45

40

35

30

25

20

NOISE FIGURE (dB)

15

10

5

0

0 14 15

Rx VGA GAIN SETTINGS

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

LNA = MAX - 32dB

LNA = MAX - 40dB

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

MAX - 40dB

MAX - 32dB

MAX - 24dB

MAX - 16dB

MAX - 8dB

MAX

131210 113 4 5 6 7 8 91 2

14128 104 62

-5-10-15-20-25
)

rms

MAX2850 toc02

MAXIMUM GAIN (dB)

0.60

0.55

MAX2850 toc05

0.50

)

RMS

0.45

(V

1dB

0.40

0.35

OUTPUT V

0.30

0.25

0.20

MAX2850 toc08

Rx EVM (%)

Rx MAXIMUM GAIN vs. FREQUENCY

80

70

60

50

40

30

20

4.9 5.9

Rx OUTPUT V

TA = -20°C

0

LNA = MAX GAIN

LNA = MAX - 8dB

LNA = MAX - 16dB

LNA = MAX - 24dB

LNA = MAX - 32dB

LNA = MAX - 40dB

FREQUENCY (GHz)

vs. GAIN SETTING

1dB

TA = +25°C

6

BASEBAND VGA GAIN CODE

TA = +85°C

8 10

5.75.55.35.1

Rx EVM vs. OFDM JAMMER POWER AT

20MHz AND 40MHz OFFSET FREQUENCY

WITH WANTED SIGNAL AT -66dBm

14

12

10

8

6

4

2

0

-40 10

20MHz OFFSET

40MHz OFFSET

INPUT POWER (dBm)

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

MAX2850

MAX2850 toc03

MAX2850 toc06

14122 4

MAX2850 toc09

_______________________________________________________________________________________ 9

5GHz, 4-Channel MIMO Transmitter

FREQUENCY (MHz)

RF FREQUENCY (GHz)

Typical Operating Characteristics (continued)

(VCC = 2.8V, f
balun, T

= +25NC, using the MAX2850 Evaluation Kit.)

A

= 5.35GHz, f

LO

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

REF

Rx EMISSION SPECTRUM AT

LNA INPUT (LNA = MAX GAIN)

-10

-20

MAX2850

-30

-40

-50

-60

(dBm)

-70

-80

-90

-100

-110
0 26.5

2.65GHz/div

Rx RF RSSI OUTPUT

2.5

LOW GAIN, TA = +85°C

2.0

1.5

1.0

RF RSSI OUTPUT VOLTAGE (V)

0.5

0

LOW GAIN,
TA = +25°C

LOW GAIN,
TA = -20°C

-50 0
RF INPUT POWER (dBm)

2LO 4LO

HIGH GAIN,
T

= +85°C

A

HIGH GAIN,
TA = +25°C

HIGH GAIN, TA = -20°C

40

Rx INPUT IMPEDANCE

MAX - 32dB

30

MAX2850 toc10

20

10

REAL PART (I)

0

-10

-20

4.80 6.00

MAX - 40dB

MAX GAIN

MAX GAIN

MAX - 32dB

MAX2850 toc11

MAX - 40dB

5.805.605.405.205.00

20

10

0

-10

-20

-30

-40

0

-2

-4

-6

-8

-10

-12

IMAGINARY PART (I)

-14

Rx INPUT RETURN LOSS (dB)

-16

-18

-20
4900 5900

Rx RF RSSI ATTACK TIME

(+40dB SIGNAL STEP)

D: 280ns

MAX2850 toc13

1.0V/div

0V

1.0V/div

0V

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

GAIN CONTROL

V

RSSI

@: 192ns

400ns/div

MAX2850 toc14

D: 1.32V
@: 1.84V

1.0V/div

0V

1.0V/div

0V

Rx INPUT RETURN LOSS

LNA = MAX - 32dB

LNA = MAX - 40dB

Rx RF RSSI DELAY TIME

(-40dB SIGNAL STEP)

D: 216ns
@: 128ns

GAIN CONTROL

V

RSSI

400ns/div

MAX2850 toc12

LNA = MAX

5700550053005100

MAX2850 toc15

D: 1.30V
@: 460mV

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

LNA =

MAX2850 toc16

2.7V

0V

2.4V

0.8V

0-20-40-60-80

Rx BASEBAND RSSI

+40dB STEP RESPONSE

D: 460ns
@: 440ns

LNA GAIN CONTROL

RSSI OUTPUT

1

µs/div

MAX2850 toc17

D: 1.50V
@: 2.30V

2.7V

2.0V

0.6V

0V

Rx BASEBAND RSSI

-32dB STEP RESPONSE

LNA GAIN CONTROL

RSSI OUTPUT

10 _____________________________________________________________________________________

1

µs/div

D: 1.18µs
@: 1.16

µs

MAX2850 toc18

D: 1.62V
@: 480mV