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MAX2850
Technical data
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MAXIM MAX2850 Technical data

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19-5009; Rev 1; 3/10
5GHz, 4-Channel MIMO Transmitter
General Description
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
5GHz, 4-Channel MIMO Transmitter
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
MAX2850
Rx LPF 20MHz CHANNEL BANDWIDTH
RESPONSE
-35
RESPONSE (dB)
-135 10k 100M
BASEBAND FREQUENCY (Hz)
Rx LPF 40MHz CHANNEL
BANDWIDTH GROUP DELAY
100
GROUP DELAY (ns)
MAX2850 toc22
MAX2850 toc19
RESPONSE (dB)
-135
Rx BASEBAND
I/Q OUTPUT
50mV/div
Rx LPF 40MHz CHANNEL BANDWIDTH
RESPONSE
-35
10k 100M
FREQUENCY (Hz)
Rx DC OFFSET SETTLING RESPONSE
(-30dB Rx VGA GAIN STEP)
GAIN-CONTROL TOGGLE
0V
MAX2850 toc23
CH1 PEAK TO PEAK: 81.9mV
100
MAX2850 toc20
GROUP DELAY (ns)
10mV/div
Rx BASEBAND
I/Q OUTPUT
Rx LPF 20MHz CHANNEL
BANDWIDTH GROUP DELAY
MAX2850 toc21
0
10k 100M
FREQUENCY (Hz)
Rx DC OFFSET SETTLING RESPONSE
GAIN-CONTROL
0V
(+8dB Rx VGA GAIN STEP)
TOGGLE
MAX2850 toc24
CH1 PEAK TO PEAK: 8.60mV
10mV/div
Rx BASEBAND
I/Q OUTPUT
0
10k 100M
FREQUENCY (Hz)
Rx DC OFFSET SETTLING RESPONSE
(+16dB Rx VGA GAIN STEP)
GAIN-CONTROL
0V
TOGGLE
200ns/div
MAX2850 toc25
CH1 PEAK TO PEAK: 17.3mV
______________________________________________________________________________________ 11
Rx BASEBAND
I/Q OUTPUT
50mV/div
200ns/div
Rx DC OFFSET SETTLING RESPONSE
(+32dB Rx VGA GAIN STEP)
GAIN-CONTROL TOGGLE
0V
200ns/div
CH1 PEAK TO PEAK: 69.0mV
MAX2850 toc26
Rx BASEBAND
I/Q OUTPUT
10mV/div
200ns/div
Rx BASEBAND DC OFFSET SETTLING
RESPONSE WITH RxHP = 1
(MAX - 40dB TO MAX LNA GAIN STEP)
GAIN-CONTROL
TOGGLE
0V
10µs/div
MAX2850 toc27
5GHz, 4-Channel MIMO Transmitter
100ns/div
100ns/div
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 BASEBAND DC OFFSET SETTLING
RESPONSE WITH RxHP = 0
(MAX TO MAX - 40dB LNA GAIN STEP)
MAX2850
GAIN-CONTROL
TOGGLE
Rx BASEBAND
I/Q OUTPUT
0V
50mV/div
Rx BASEBAND VGA SETTLING
RESPONSE (-30dB BASEBAND
VGA GAIN STEP)
Rx BASEBAND
I/Q OUTPUT
0V
0.1V/div
10µs/div
MAX2850 toc28
MAX2850 toc31
CH1 PEAK TO PEAK : 652mV
GAIN-CONTROL
TOGGLE
Rx BASEBAND
I/Q OUTPUT
10mV/div
Rx BASEBAND
OUTPUT
0.1V/div
Rx BASEBAND DC OFFSET SETTLING
RESPONSE WITH RxHP = 1
(MAX - 40dB TO MAX LNA GAIN STEP)
GAIN-CONTROL
TOGGLE
0V
10µs/div
Rx BASEBAND VGA SETTLING RESPONSE (+4dB BASEBAND
VGA GAIN STEP)
GAIN-CONTROL
TOGGLE
0V
CH1 PEAK TO PEAK: 568mV
MAX2850 toc29
MAX2850 toc32
Rx BASEBAND
I/Q OUTPUT
50mV/div
Rx BASEBAND
OUTPUT
0.1V/div
Rx BASEBAND DC OFFSET SETTLING
RESPONSE WITH RxHP = 0
(MAX - 40dB TO MAX LNA GAIN STEP)
GAIN-CONTROL
TOGGLE
0V
10µs/div
Rx BASEBAND VGA SETTLING RESPONSE (+16dB BASEBAND
VGA GAIN STEP)
CH1 PEAK TO PEAK: 532mV
GAIN-CONTROL
TOGGLE
0V
MAX2850 toc30
MAX2850 toc33
100ns/div
100ns/div
Rx BASEBAND VGA SETTLING
Rx BASEBAND
OUTPUT
0.1V/div
RESPONSE (+30dB BASEBAND
VGA GAIN STEP)
CH1 PEAK TO PEAK: 800mV CLIPPING NEGATIVE
GAIN-CONTROL
TOGGLE
0V
100ns/div
MAX2850 toc34
0.1V/div
Rx BASEBAND
OUTPUT
Rx LNA SETTLING RESPONSE
(MAX TO MAX - 40dB GAIN STEP)
0V
MAX2850 toc35
D: 130mv @: 132mv
CH1 RMS: 168mV
GAIN-CONTROL
TOGGLE
Rx LNA SETTLING RESPONSE
(MAX - 8dB TO MAX GAIN STEP)
GAIN-CONTROL
TOGGLE
Rx BASEBAND
OUTPUT
0V
0.1V/div
D: 130mv @: 132mv
CH1 RMS: 188mV
12 _____________________________________________________________________________________
100ns/div
MAX2850 toc36
5GHz, 4-Channel MIMO Transmitter
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
MAX2850
Rx BASEBAND
OUTPUT
0.1V/div
Rx BASEBAND
OUTPUT
0.1V/div
Rx LNA SETTLING RESPONSE
(MAX - 16dB TO MAX GAIN STEP)
CH1 RMS: 176mV
GAIN-CONTROL
TOGGLE
0V
D: 130mv @: 132mv
100ns/div
Rx LNA SETTLING RESPONSE
(MAX - 40dB TO MAX GAIN STEP)
CH1 RMS: 154mV
GAIN-CONTROL
TOGGLE
0V
MAX2850 toc37
MAX2850 toc40
Rx BASEBAND
OUTPUT
0.1V/div
648
540
432
324
216
Rx LNA SETTLING RESPONSE
(MAX - 24dB TO MAX GAIN STEP)
CH1 RMS: 174mV
GAIN-CONTROL
TOGGLE
0V
D: 130mv @: 132mv
100ns/div
HISTOGRAM: Rx I/Q GAIN IMBALANCE
MAX2850 toc38
MAX2850 toc41
Rx BASEBAND
OUTPUT
0.1V/div
180
150
120
90
60
Rx LNA SETTLING RESPONSE
(MAX - 32dB TO MAX GAIN STEP)
CH1 RMS: 155mV
GAIN-CONTROL
TOGGLE
0V
D: 130mv @: 132mv
200ns/div
HISTOGRAM: Rx I/Q PHASE IMBALANCE
MAX2850 toc39
MAX2850 toc42
D: 130mv @: 132mv
200ns/div
HISTOGRAM: Rx STATIC DC OFFSET
132
110
88
66
44
22
0
-15.000m 0 15.000m SAMPLES = 3413, AVG = -0.5mV,
STDEV = 2.14mV
______________________________________________________________________________________ 13
MAX2850 toc43
108
0
-800.00m 800.00m0 SAMPLES = 3413, AVG = -0.015dB,
STDEV = 0.042dB
POWER-ON DC OFFSET CANCELLATION
WITH INPUT SIGNAL
D: 2.14µs @: 2.12
0V
2V/div
0V
0.1V/div
Rx ENABLE
Rx BASEBAND OUTPUT
ENGAGE 600kHz HIGHPASS CORNER
1µs/div
µs
MAX2850 toc44
D: 112mV @: 104mV
30
0
-2.0000 0 2.0000 SAMPLES = 3413, AVG = -0.15deg,
STDEV = 0.18deg
POWER-ON DC OFFSET CANCELLATION
WITHOUT INPUT SIGNAL
Rx ENABLE
RXBB_I
50mV/div
RXBB_Q
500mV/div
TURN-ON TRANSIENT
400ns/div
MAX2850 toc45
(dB)
5GHz, 4-Channel MIMO Transmitter
Typical Operating Characteristics (continued)
(VCC = 2.8V, f balun, T
MAX2850
= +25NC, using the MAX2850 Evaluation Kit.)
A
196
195
194
193
192
191
190
189
SUPPLY CURRENT (mA)
188
187
186
2.6 3.6
0
-2
-4
-6
-8
-10
RETURN LOSS (dB)
-12
-14
-16
-18 4900 5900
Tx OUTPUT POWER vs. Tx CHANNELS
-2
-3
-4
-5
-6
OUTPUT POWER (dBm)
-7
-8
4900
= 5.35GHz, f
LO
= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
REF
SINGLE Tx SUPPLY CURRENT
vs. SUPPLY VOLTAGE
TA = +25 AND +85°C
TA = -20°C
3.53.43.2 3.32.8 2.9 3.0 3.12.7
SUPPLY VOLTAGE (V)
TX2 OUTPUT RETURN LOSS
vs. FREQUENCY
TA = -20°C
TA = +85°C
TA = +25°C
5700550053005100
FREQUENCY (MHz)
(GAIN = MAX - 3dB, 40MHz MODE,
5000
100mV
TX1
5100
BB INPUT)
RMS
TX2
TX3
5500
5400
5300
5200
FREQUENCY (MHz)
5600
TX4
5700
5800
525
520
MAX2850 toc46
515
510
505
SUPPLY CURRENT (mA)
500
495
MAX2850 toc49
-5
-10
-15
RETURN LOSS (dB)
-20
-25
-5
MAX2850 toc52
-10
-15
-20
-25
OUTPUT POWER (dBm)
-30
-35
-40
5900
QUAD Tx SUPPLY CURRENT
vs. SUPPLY VOLTAGE
TA = +85°C
TA = +25°C
TA = -20°C
SUPPLY VOLTAGE (V)
OUTPUT RETURN LOSS AT
= +25°C vs. Tx CHANNELS
T
A
0
TX4
TX2
TX3
TX1
5700
5600
5500
5400
5300
5200
5100
5000
4900
FREQUENCY (MHz)
Tx OUTPUT POWER vs. GAIN SETTING
0
TA = -20°C
TA = +85°C
TA = +25°C
0 70
Tx GAIN CODE
605010 20 30 40
3.53.43.2 3.32.8 2.9 3.0 3.12.72.6 3.6
5800
20
MAX2850 toc47
-20
-40
-60
-80
-100
MAX2850 toc50
-1
-2
-3
OUTPUT POWER (dBm)
-4
-5
-6
5900
-0.2
-0.3
MAX2850 toc53
-0.4
-0.5
GAIN STEP (dB)
-0.6
-0.7
-0.8
Tx BASEBAND RESPONSE
0
RFBW = 40MHz
RFBW = 20MHz
1.00E+06 1.00E+08
1.00E+07
BASEBAND FREQUENCY (Hz)
TX2 OUTPUT POWER AT MAXIMUM
GAIN vs. RF FREQUENCY
1
0
TA = -20°C
TA = +25°C
TA = +85°C
5400
5300
4900
5100
5200
5000
RF FREQUENCY (MHz)
5500
5600
Tx GAIN STEP vs. GAIN SETTING
TA = -20°CTA = +25°C
TA = +85°C
0 70
Tx GAIN CODE
5700
605040302010
5800
MAX2850 toc48
MAX2850 toc51
5900
MAX2850 toc54
14 _____________________________________________________________________________________
5GHz, 4-Channel MIMO Transmitter
Typical Operating Characteristics (continued)
(VCC = 2.8V, f balun, T
= +25NC, using the MAX2850 Evaluation Kit.)
A
(100mV
-28
-30
-32
EVM (dB)
-34
-36
-38
-40 0
-35
-40
-45
-50
-55
CARRIER LEAKAGE (dBc)
-60
-65
4900
-25
-30
-35
-40
UNWANTED SIDEBAND (dBc)
-45
-50 0 70
= 5.35GHz, f
LO
REF
Tx EVM vs. OUTPUT POWER
54Mbps WLAN SIGNAL)
RMS
TA = +25°C
TA = -20°C
TA = +85°C
OUTPUT POWER (dBm)
Tx CARRIER LEAKAGE
vs. RF FREQUENCY
TA = -20°C
5300
TA = +85°C
5400
5500
TA = +25°C
5200
5100
5000
RF FREQUENCY (MHz)
Tx UNWANTED SIDEBAND
vs. GAIN SETTING
TA = +85°C
TA = +25°C
TA = -20°C
Tx GAIN CODE
= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
TX2 OUTPUT SPECTRUM AT -5dBM
Tx MAX OUTPUT POWER MEETING -33dB
EVM AND 802.11a SPECTRAL MASK
2
MAX2850 toc55
-2
-4
OUTPUT POWER (dBm)
-6
-8
-5-10-15-20-25-30-35
TA = -20°C
0
TA = +85°C
TA = +25°C
4900 5900
RF FREQUENCY (MHz)
5700550053005100
MAX2850 toc56
10dB/div
-40dBr
(20MHz CHANNEL BANDWIDTH,
802.11a 54Mbps)
-18
-28
-38
-48
-58
-68
-78
-88
-98 5300 5350 5400
0dBr
RF FREQUENCY (MHz)
Tx UNWANTED SIDEBAND
5600
5700
5800
-25
-30
MAX2850 toc58
-35
-40
-45
-50
CARRIER LEAKAGE (dBc)
-55
-60
-65
5900
Tx CARRIER LEAKAGE vs. GAIN SETTING
TA = +85°C
TA = -20°C
TA = +25°C
0 70
Tx GAIN CODE
605010 20 30 40
-35
MAX2850 toc59
-40
-45
-50
-55
UNWANTED SIDEBAND (dBc)
-60
-65
4900
5000
vs. RF FREQUENCY
TA = +25°C
5400
5300
5200
5100
RF FREQUENCY (MHz)
TA = +85°C
TA = -20°C
5600
5500
5700
Tx OUTPUT EMISSION SPECTRUM AT
MAX GAIN AND COLD
(100mV
0dBm
LO
MAX2850 toc61
OUTPUT
POWER
(dBm/MHz)
605040302010
-100dBm 0 26.5
802.11a 54Mbps SIGNAL)
RMS
3 x LO
2 x LO
2.65GHz/div
RF FREQUENCY (GHz)
4 x LO
5 x LO
MAX2850 toc62
-30
-35
-40
-45
-50
-55
-60
ISOLATION (dB)
-65
-70
-75
-80
Tx CHANNEL ISOLATION
TX1 TO 4
TX1 TO 2
5200
5100
5000
4900
RF FREQUENCY (MHz)
TX2 TO 4
5400
5300
TX4 TO 3
5500
5600
TX3 TO 4
5700
5800
5800
MAX2850
MAX2850 toc57
MAX2850 toc60
5900
MAX2850 toc63
5900
______________________________________________________________________________________ 15
5GHz, 4-Channel MIMO Transmitter
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
HISTOGRAM: CARRIER SUPPRESSION
102
85
MAX2850
68
51
34
17
0
-50.000 -18.000-34.000 SAMPLES = 3413, AVG = -34.9dBc,
STDEV = 3.61dB
LO FREQUENCY vs. DIFFERENTIAL
TUNE VOLTAGE AT T
7.0
6.5
6.0
5.5
5.0
LO FREQUENCY (GHz)
4.5
4.0 0 2.5
DIFFERENTIAL TUNE VOLTAGE (V)
LO PHASE NOISE AT 5900MHz AND HOT
TEMPERATURE
-50
-60
-70
-80
-90
-100
-110
PHASE NOISE (dBc/Hz)
-120
-130
-140
-150 1k 10M
OFFSET FREQUENCY (Hz)
= +25°C
A
MAX2850 toc64
2.01.51.00.5
156
130
104
600
500
MAX2850 toc67
400
300
LO GAIN (MHz/V)
200
100
25kHz
MAX2850 toc70
FREQUENCY (5kHz/div)
-25kHz
HISTOGRAM: SIDEBAND SUPPRESSION
78
52
26
0
-62.000 -26.000-44.000 SAMPLES = 3413, AVG = -44.6dBc,
STDEV = 2.58dB
MAX2850 toc65
LO GAIN vs. DIFFERENTIAL
TUNE VOLTAGE AT T
0
0 2.5
DIFFERENTIAL TUNE VOLTAGE (V)
= +25°C
A
2.01.51.00.5
CHANNEL SWITCHING FREQUENCY SETTLING (4900MHz TO 5900MHz,
AUTOMATIC VCO SUB-BAND SELECTION)
0s 3.99ms
4.5
4.0
3.5
3.0
SUPPLY CURRENT (mA)
2.5
2.0
-50
-60
MAX2850 toc68
-70
-80
-90
-100
-110
PHASE NOISE (dBc/Hz)
-120
-130
-140
-150
25kHz
MAX2850 toc71
FREQUENCY (5kHz/div)
-25kHz
CLOCKOUT MODE SUPPLY CURRENT
TA = +85°C
T
= +25°C
A
TA = -20°C
2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
SUPPLY VOLTAGE (V)
LO PHASE NOISE AT 5350MHz AND ROOM
TEMPERATURE
1k 10M
OFFSET FREQUENCY (Hz)
CHANNEL SWITCHING FREQUENCY SETTLING (5900MHz TO 4900MHz,
AUTOMATIC VCO SUB-BAND SELECTION)
0s 3.99ms
MAX2850 toc66
MAX2850 toc69
MAX2850 toc72
16 _____________________________________________________________________________________
5GHz, 4-Channel MIMO Transmitter
Typical Operating Characteristics (continued)
(VCC = 2.8V, f balun, T
= +25NC, using the MAX2850 Evaluation Kit.)
A
CHANNEL SWITCHING FREQUENCY SETTLING (4900MHz TO 5900MHz,
MANUAL VCO SUB-BAND SELECTION)
25kHz
= 5.35GHz, f
LO
= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
REF
CHANNEL SWITCHING FREQUENCY SETTLING (5900MHz TO 4900MHz,
MANUAL VCO SUB-BAND SELECTION)
25kHz
Tx-TO-Rx TURNAROUND FREQUENCY
SETTLING AT MAX Tx POWER
50kHz
MAX2850
FREQUENCY (5kHz/div)
-25kHz 0s 99.22µs
Rx-TO-Tx TURNAROUND FREQUENCY
SETTLING AT MAX Tx POWER
50kHz
FREQUENCY ERROR (10kHz/div)
-50kHz 0s 49.84µs
5µs/div
MAX2850 toc73
-25kHz
FREQUENCY (5kHz/div)
0s 99.22µs
100
80
MAX2850 toc76
60
40
20
0
-20
-40
-60
-80
FREQUENCY DEVIATION FROM 40MHz (ppm)
-100
MAX2850 toc74
FREQUENCY ERROR (10kHz/div)
-50kHz 0s 49.84µs
5µs/div
CRYSTAL OSCILLATOR TUNING RANGE WITH KYOCERA 40MHz 2520 CRYSTAL
TA = +25°C
TA = +85°C
TA = -20°C
0 300
CRYSTAL TUNING CODE
25020015010050
MAX2850 toc75
MAX2850 toc77
CRYSTAL OSCILLATOR TUNING
CRYSTAL OSCILLATOR TUNING STEP
WITH KYOCERA 2520 40MHz CRYSTAL
2.5
2.0
1.5
1.0
(ppm)
0.5
0
CRYSTAL OSCILLATOR FREQUENCY TUNING STEP
-0.5 0 300
XTAL TUNING CODE
MAX2850 toc78
25020015010050
CAPACITANCE AT BASE AND EMITTER
(INCLUDE EV KIT COMPONENTS)
140
120
100
80
60
40
20
CAPACITANCE AT BASE AND EMITTER (pF)
0
0 300
EMITTER-TO-GROUND
CAPACITANCE
BASE-TO-GROUND
CAPACITANCE
MAX2850 toc79
25020015010050
______________________________________________________________________________________ 17
5GHz, 4-Channel MIMO Transmitter
Pin Configuration
TOP VIEW
CC_VCO
V
BYP_VCO
GND_VCO
RSSI
RXBBQ+
RXBBQ-
43 42 41 40 39 38 37 36 35
MAX2850
TXRF2-
GND
PA_BIAS2
CC_PA_BIAS
V
CC_LO
V
PA_BIAS3
TQFN
10mm x 10mm
RXBBI-
TXRF3+
RXBBI+
TXRF3-
TXBBQ3+
TXBBQ3-
GND
PA_DET3
TXBBI3-
CC_UCX3
V
TXBBI3+
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
CC_UCX4
V
DIN
SCLK
CS
TXBBQ4-
TXBBQ4+
TXBBI4-
TXBBI4+
V
CC_BB2
V
CC_MXR
RXRF+
RXRF-
V
CC_LNA
PA_DET4
TXRF4-
TXRF4+
PA_BIAS4
GND
MAX2850
V
CC_XTAL
XTAL
XTAL_CAP
ENABLE
TXBBI2+
TXBBI2-
TXBBQ2+
TXBBQ2-
V
CC_BB1
TXBBI1+
TXBBI1-
TXBBQ1+
TXBBQ1-
PA_DET1
TXRF1+
TXRF1-
PA_BIAS1
CC_DIG
CPOUT+
CPOUT-
V
DOUT
CLKOUT
51 50 49 48 47 46 45 44
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
GND
PA_DET2
TXRF2+
CC_UCX1
V
CC_UCX2
V
Pin Description
PIN NAME FUNCTION
1 V 2 V
CC_UCX1
CC_UCX2
3 PA_DET2 External Power-Amplifier Detector Mux Input 2 4 GND Ground 5 TXRF2+ 6 TXRF2­7 GND Ground 8 PA_BIAS2 External Power-Amplifier Voltage Bias Output 2
9 V
10 V
CC_PA_BIAS
CC_LO
11 PA_BIAS3 External Power-Amplifier Voltage Bias Output 3 12 TXRF3+ 13 TXRF3­14 PA_DET3 External Power Amplifier Detector Mux Input 3
18 _____________________________________________________________________________________
Transmitter 1 Upconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin. Transmitter 2 Upconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin.
Transmitter 2 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.
LO Generation Supply Voltage. Bypass with a capacitor as close as possible to the pin.
Transmitter 3 Differential Output. These pins are in open-collector configuration. These pins should be biased at the supply voltage with differential impedance terminated at 300I.
5GHz, 4-Channel MIMO Transmitter
Pin Description (continued)
PIN NAME FUNCTION
15 GND Ground 16 V 17 V 18 GND Ground 19 PA_BIAS4 External Power-Amplifier Voltage Bias Output 4 20 TXRF4+ 21 TXRF4­22 PA_DET4 External Power-Amplifier Detector Mux Input 4 23 V 24 RXRF­25 RXRF+ 26 V 27 V 28 TXBBI4+ 29 TXBBI4­30 TXBBQ4+ 31 TXBBQ4­32 33 SCLK Serial-Clock Logic Input of 4-Wire Serial Interface 34 DIN Data Logic Input of 4-Wire Serial Interface 35 TXBBI3+ 36 TXBBI3­37 TXBBQ3+ 38 TXBBQ3­39 RXBBI+ 40 RXBBI­41 RXBBQ+ 42 RXBBQ­43 RSSI Receiver Signal-Strength Indicator Output 44 V
45 BYP_VCO
46 GND_VCO VCO Ground 47 CPOUT+ 48 CPOUT­49 V 50 DOUT Data Logic Output of 4-Wire Serial Interface 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 ENABLE Enable Logic Input
CC_UCX3
CC_UCX4
CC_LNA
CC_MXR
CC_BB2
CS
CC_VCO
CC_DIG
CC_XTAL
Transmitter 3 Upconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin. Transmitter 4 Upconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin.
Transmitter 4 Differential Output. These pins are in open-collector configuration. These pins should be biased at the supply voltage with differential impedance terminated at 300I.
Receiver LNA Supply Voltage. Bypass with a capacitor as close as possible to the pin.
Receiver LNA Differential Input. Input is DC-coupled and biased internally at 1.2V.
Receiver Downconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin. Receiver Baseband Supply Voltage 2. Bypass with a capacitor as close as possible to the pin.
Transmitter 4 Baseband I-Channel Differential Input
Transmitter 4 Baseband Q-Channel Differential Input
Chip-Select Logic Input of 4-Wire Serial Interface
Transmitter 3 Baseband I-Channel Differential Input
Transmitter 3 Baseband Q-Channel Differential Input
Receiver Baseband I-Channel Differential Output
Receiver Baseband Q-Channel Differential Output
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.
MAX2850
______________________________________________________________________________________ 19
5GHz, 4-Channel MIMO Transmitter
Pin Description (continued)
PIN NAME FUNCTION
56 TXBBI2+ 57 TXBBI2­58 TXBBQ2+ 59 TXBBQ2­60 V
MAX2850
61 TXBBI1+ 62 TXBBI1­63 TXBBQ1+ 64 TXBBQ1­65 PA_DET1 External Power-Amplifier Detector Mux Input 1 66 TXRF1+ 67 TXRF1­68 PA_BIAS1 External Power-Amplifier Voltage Bias Output 1
— EP
CC_BB1
Table 1. Operating Modes
MODE
SHUTDOWN
CLKOUT
STANDBY
Rx Tx
Tx CALIBRATION
RF LOOPBACK
BASEBAND LOOPBACK
Note 4: PA_BIAS pins may be kept active in nontransmit mode(s) by SPI programming. Note 5: CLKOUT signal is active independent of SPI, and is only dependent on the ENABLE pin.
Transmitter 2 Baseband I-Channel Differential Input
Transmitter 2 Baseband Q-Channel Differential Input
Receiver Baseband Supply Voltage 1. Bypass with a capacitor as close as possible to the pin.
Transmitter 1 Baseband I-Channel Differential Input
Transmitter 1 Baseband Q-Channel Differential Input
Transmitter 1 Differential Output. These pins are in open-collector configuration. These pins should be biased at the supply voltage with differential impedance terminated at 300I.
Exposed Pad. 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.
MODE CONTROL
LOGIC INPUTS
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
SPI MAIN
ADDRESS 0,
D4:D2
Rx PATH
CIRCUIT BLOCK STATES
Tx PATH
(Note 4)
LO PATH
CLKOUT
(Note 5)
Calibration
Sections On
AM detector
+ Rx I/Q buffers
Tx 4 baseband
buffer
Detailed Description
pin ENABLE (pin 55) and SPI Main address 0 D4:D2 control the various modes.
Modes of Operation
The modes of operation for the MAX2850 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
20 _____________________________________________________________________________________
The MAX2850 features a low-power shutdown mode. All circuit blocks are powered down, except the 4-wire serial bus and its internal programmable registers.
Shutdown Mode
5GHz, 4-Channel MIMO Transmitter
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 may be selectively enabled in this mode.
Receive (Rx) Mode
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 pins after a programmable delay.
Transmit Calibration
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 Rx baseband 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 Rx baseband output. The mixing product between the wanted sideband and the unwant­ed sideband forms 2Ftone at Rx baseband output.
As Tx RF output is self-mixed at the AM detector, the AM detector output responds differently to different gain settings and power levels. When 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.
RF Loopback
In RF loopback mode, part of the Rx and Tx circuit blocks except the LNA are powered on and active. The transmitter 4 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 receiver
4 baseband I/Q outputs. The I/Q lowpass filters in the transmitter signal path are bypassed.
Baseband Loopback
In baseband loopback mode, part of the Rx and Tx baseband circuit blocks are powered and active. The transmitter 4 I/Q input signal is routed to receiver low­pass filter input. Output signals are delivered to receiver 4 baseband I/Q outputs.
Power-On Sequence
Set the ENABLE pin to V oscillator. Program all SPI addresses according to rec­ommended values. Set SPI Main address 0 D4:D2 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 will take 2ms. After the LO frequency is locked, set SPI Main address 0 D4:D2 = 010 and 011 for Rx and Tx operat­ing modes, respectively. Before engaging Rx mode, set Main address 5 D1 = 1 to allow fast DC offset settling. After engaging Rx mode and Rx baseband DC offset settles, the user can set Main address 5 D1 = 0 to com­plete Rx DC offset cancellation.
for 2ms to start the crystal
CC
Programmable Registers and
4-Wire SPI Interface
The MAX2850 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 (A4:A0 in Figure 1). The 10 least significant bits (LSBs) are register data (D9:D0 in Figure 1). Register data is loaded through the 4-wire SPI/MICROWIRE™­compatible 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 SCLK pin. At the CS rising edge, the 10-bit data bits are latched into the register selected by 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. The register values are preserved in shutdown mode as long as the power-supply voltage is maintained. There is no power-on SPI register self-reset functionality in the MAX2850, so 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.
MAX2850
MICROWIRE is a trademark of National Semiconductor Corp.
______________________________________________________________________________________ 21
5GHz, 4-Channel MIMO Transmitter
CS
t
CSW
MAX2850
SCLK
DIN
(SPI WRITE)
DIN
(SPI READ)
DOUT
(SPI READ)
t
CSO
t
CSS
t
t
DS
A0 D9 D0A4R/W
A4R/W A0 D9 D0 DON’T CARE
DON’T CARE D9
CH
t
DH
t
CL
t
D
t
CSH
t
CS1
DON’T CARE
D0 DON’T CARE
Figure 1. 4-Wire SPI Serial-Interface Timing Diagram
SPI Register Definition
(All values in the register summary table are typical numbers. The MAX2850 SPI does not have a power-on-default self­reset 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 ADDRESS DATA
REGISTER
Main0 0 00000
Main1 0 00001
Main2 0 00010
Main3 0 00011
Main0_
D0
22 _____________________________________________________________________________________
A4:A0
WRITE (W)/
READ (R)
W/R RESERVED E_TX<4:1> MODE<2:0> RFBW M/L_SEL
Default 0 1 1 1 1 0 0 0 1 0
W/R RESERVED RESERVED LNA_GAIN<2:0> RX_VGA<4:0>
Default 0 0 1 1 1 1 1 1 1 1
W/R RESERVED RESERVED RESERVED LNA_BAND<1:0> RESERVED RESERVED RESERVED RESERVED RESERVED
Default 0 1 1 0 1 0 0 0 0 0
W RESERVED RESERVED
R RESERVED RESERVED RESERVED TS_READ<4:0>
Default 0 0 0 0 0 0 0 0 0 0
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
TS_EN TS_TRIG
RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED
5GHz, 4-Channel MIMO Transmitter
Table 2. MAX2850 Register Summary (continued)
READ/WRITE AND ADDRESS DATA
REGISTER
Main4 0 00100 Reserved 1 1 0 0 0 1 1 1 0 0
Main5 0 00101
Main6 0 00110 Reserved 1 1 1 1 1 0 1 0 0 0
Main7 0 00111 Reserved 0 0 0 0 1 0 0 1 0 0
Main8 0 01000 W/R 0 0 0 0 0 0 0 0 0 0
Main9 0 01001
Main10 0 01010 Reserved 0 0 0 0 0 0 0 0 0 0
Main11 0 01011
Main13 0 01101 Reserved 0 0 0 0 0 0 0 0 0 0
Main14 0 01110
Main15 0 01111
Main16 0 10000
Main17 0 10001
Main18 0 10010
Main19 0 10011
Main20 0 10100 Reserved 0 1 1 1 1 0 1 0 1 0
Main21 0 10101
Main22 0 10110 Reserved 0 1 1 0 1 1 1 0 0 0
Main23 0 10111 Reserved 0 0 0 1 1 0 0 1 0 1
Main24 0 11000 Reserved 1 0 0 1 0 0 1 1 1 1
Main25 0 11001 Reserved 1 1 1 0 1 0 1 0 0 0
Main26 0 11010 Reserved 0 0 0 0 0 1 0 1 0 1
Main27 0 11011
Main28 0 11100
Main0_
D0
A4:A0
WRITE (W)/
READ (R)
W/R RESERVED RSSI_MUX_SEL<2:0> RESERVED RESERVED RESERVED RESERVED RXHP RESERVED
Default 0 0 0 0 0 0 0 0 0 0
W/R TX_GAIN<5:0> TX_GAIN_PROG_SEL<4:1>
Default 0 0 0 0 0 0 1 1 1 1
W/R RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED E_TX_AMD<1:0> PA_DET_SEL<1:0>
Default 0 0 0 1 1 0 0 0 0 0
W/R RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED DOUT_SEL RESERVED
Default 0 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 RESERVED XTAL_TUNE<7:0>
Default 0 0 1 0 0 0 0 0 0 0
W/R RESERVED RESERVED
Read VAS_ADC<2:0> VCO_BAND<5:0>
Default 0 0 0 1 0 1 1 1 1 1
Read RESERVED RESERVED DIE_ID<2:0> RESERVED RESERVED RESERVED RESERVED 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 RESERVED RESERVED RESERVED RESERVED RESERVED PA_BIAS_DLY<3:0>
Default 0 0 0 1 1 0 0 0 1 1
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
VAS_
TRIG_EN
DIE_ID_
READ
RESERVED SYN_CONFIG_N<6:0>
VAS_
RELOCK_
SEL
RESERVED RESERVED RESERVED
VAS_
MODE
VAS_VCO_
READ
RESERVED RESERVED RESERVED RESERVED RESERVED
VAS_SPI<5:0>
MAX2850
______________________________________________________________________________________ 23
5GHz, 4-Channel MIMO Transmitter
Table 2. MAX2850 Register Summary (continued)
READ/WRITE AND ADDRESS DATA
REGISTER
Main29 0 11101 Reserved 0 0 0 0 0 0 0 0 0 0
Main30 0 11110 Reserved 0 0 0 0 0 0 0 0 0 0
Main31 0 11111 Reserved 0 0 0 0 0 0 0 0 0 0
MAX2850
Local1 1 00001 Reserved 0 0 0 0 0 0 0 0 0 0
Local2 1 00010 Reserved 0 0 0 0 0 0 0 0 0 0
Local3 1 00011 Reserved 0 0 0 0 0 0 0 0 0 0
Local4 1 00100 Reserved 1 1 1 0 0 0 0 0 0 0
Local5 1 00101 Reserved 0 0 0 0 0 0 0 0 0 0
Local6 1 00110 Reserved 0 0 0 0 0 0 0 0 0 0
Local7 1 00111 Reserved 0 0 0 0 0 0 0 0 0 0
Local8 1 01000 Reserved 0 1 1 0 1 0 1 0 1 0
Local9 1 01001 Reserved 0 1 0 0 0 1 0 1 0 0
Local10 1 01010 Reserved 1 1 0 1 0 1 0 1 0 0
Local11 1 01011 Reserved 0 0 0 1 1 1 0 0 1 1
Local12 1 01100 Reserved 0 0 0 0 0 0 0 0 0 0
Local13 1 01101 Reserved 0 0 0 0 0 0 0 0 0 0
Local14 1 01110 Reserved 0 0 0 0 0 0 0 0 0 0
Local15 1 01111 Reserved 0 0 0 0 0 0 0 0 0 0
Local16 1 10000 Reserved 0 0 0 0 0 0 0 0 0 0
Local17 1 10001 Reserved 0 0 0 0 0 0 0 0 0 0
Local18 1 10010 Reserved 0 0 0 0 0 0 0 0 0 0
Local19 1 10011 Reserved 0 0 0 0 0 0 0 0 0 0
Local20 1 10100 Reserved 0 0 0 0 0 0 0 0 0 0
Local21 1 10101 Reserved 0 0 0 0 0 0 0 0 0 0
Local22 1 10110 Reserved 0 0 0 0 0 0 0 0 0 0
Local23 1 10111 Reserved 0 0 0 0 0 0 0 0 0 0
Local24 1 11000 Reserved 0 0 1 1 0 0 0 1 0 0
Local25 1 11001
Local26 1 11010 Reserved 0 1 0 1 1 0 0 1 0 1
Local27 1 11011
Local28 1 11100 Reserved 0 0 0 0 0 0 0 1 0 0
Local31 1 11111 Reserved 0 0 0 0 0 0 0 0 0 0
Main0_
D0
A4:A0
WRITE (W)/
READ (R)
Reserved 0 1 0 0 1 0 1 0 1 1
W/R RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED
Default 0 0 0 0 0 0 0 0 0 0
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
TX_AMD_
BB_GAIN
TX_AMD_RF_GAIN
<1:0>
24 _____________________________________________________________________________________
5GHz, 4-Channel MIMO Transmitter
Table 3. Main Address 0: (A4:A0 = 00000)
MAX2850
BIT NAME
RESERVED D9 Reserved bits; set to default
E_TX<4:1> D8:D5
MODE<2:0> D4:D2
RFBW D1
M/L_SEL D0
BIT LOCATION
(D0 = LSB)
DESCRIPTION
Tx MIMO Channel Select
Select Tx channels independently. 0 = Not select 1 = Select in Tx, Tx calibration, or RF loopback modes 1111 = Default
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
Table 4. Main Address 1: (A4:A0 = 00001, Main Address 0 D0 = 0)
BIT NAME
RESERVED D9:D8 Reserved bits; set to default
LNA_GAIN<2:0> D7:D5
VGA_GAIN<4:0> D4:D0
BIT LOCATION
(D0 = LSB)
LNA Gain Control
Active when Rx channel is selected by corresponding RX_PATH_UNMASK<5:1> bits in Main address 6 D9:D5. 000 = Maximum - 40dB 001 = Maximum - 32dB 100 = Maximum - 24dB 101 = Maximum - 16dB 110 = Maximum - 8dB 111 = Maximum gain (default)
Rx VGA Gain Control
Active when Rx channel is selected by corresponding RX_PATH_UNMASK<5:1> bits in Main address 6 D9:D5. 00000 = Minimum gain 00001 = Minimum + 2dB
…
01110 = Minimum + 28dB 01111 = Minimum + 30dB
…
1xxxx = Minimum + 30dB (default)
______________________________________________________________________________________ 25
DESCRIPTION
5GHz, 4-Channel MIMO Transmitter
Table 5. Main Address 2: (A4:A0 = 00010, Main Address 0 D0 = 0)
BIT NAME
RESERVED D9:D7 Reserved bits; set to default
LNA_BAND<1:0> D6:D5
MAX2850
RESERVED D4:D0 Reserved bits; set to default
BIT LOCATION
(D0 = LSB)
DESCRIPTION
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
Table 6. Main Address 3: (A4:A0 = 00011, Main Address 0 D0 = 0)
BIT NAME
RESERVED D9:D8 Reserved bits; set to default
TS_EN D7
TS_TRIG D6
RESERVED D5 Reserved bits; set to default
TS_READ<4:0> D4:D0
BIT LOCATION
(D0 = LSB)
DESCRIPTION
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
SPI readback only. Temperature sensor reading.
Table 7. Main Address 5: (A4:A0 = 00101, Main Address 0 D0 = 0)
BIT NAME
RESERVED D9 Reserved bits; set to default
RSSI_MUX_SEL<2:0> D8:D6
RESERVED D5:D2 Reserved bits, set to default
RXHP D1
RESERVED D0 Reserved bits; set to default
26 _____________________________________________________________________________________
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
Rx VGA Highpass Corner Select after Rx Turn-On
RXHP starts at 1 during Rx gain adjustment, and set to 0 after gain is adjusted. 0 = 10kHz highpass corner after Rx gain is adjusted (default) 1 = 600kHz highpass corner during Rx gain adjustment
5GHz, 4-Channel MIMO Transmitter
Table 8. Main Address 9: (A4:A0 = 01001, Main Address 0 D0 = 0)
BIT NAME
TX_GAIN<5:0> D9:D4
BIT LOCATION
(D0 = LSB)
DESCRIPTION
Tx VGA Gain Control
Tx channel is selected by Main address 9 D3:D0. 000000 = Minimum gain (default)
…
111111 = Minimum gain + 31.5dB
Tx Channel Gain Programming Select
Gain is determined by Main address 9 D9:D4.
TX_GAIN_PROG_SEL<4:1> D3:D0
0 = Not selected 1 = Selected 1111 = Default
Table 9. Main Address 11: (A4:A0 = 01011, Main Address 0 D0 = 0)
BIT NAME
RESERVED D9:D4 Reserved bits; set to default
E_TX_AMD<1:0> D3:D2
BIT LOCATION
(D0 = LSB)
DESCRIPTION
Tx Calibration AM Detector Channel Select
Only active in Tx calibration mode. 00 = Select TX1 (default) 01 = Select TX2 10 = Select TX3 11 = Select TX4
MAX2850
PA Power-Detector Mux Output Select
00 = Select PA_DET1 (default)
PA_DET_SEL<1:0> D1:D0
01 = Select PA_DET2 10 = Select PA_DET3 11 = Select PA_DET4
Table 10. Main Address 14: (A4:A0 = 01110, Main Address 0 D0 = 0)
BIT NAME
RESERVED D9:D2 Reserved bits; set to default
DOUT_SEL D1
RESERVED D0 Reserved bits; set to default
______________________________________________________________________________________ 27
BIT LOCATION
(D0 = LSB)
DESCRIPTION
DOUT Pin Output Select
0 = PLL lock detect (default) 1 = SPI readback
5GHz, 4-Channel MIMO Transmitter
Table 11. Main Address 15: (A4:A0 = 01111, Main Address 0 D0 = 0)
BIT NAME
VAS_TRIG_EN D9
MAX2850
RESERVED D8:D7 Reserved bits; set to default
SYN_CONFIG_N<6:0> D6:D0
BIT LOCATION
(D0 = LSB)
DESCRIPTION
Enable VCO Sub-Band Acquisition Triggered 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
Table 12. Main Address 16: (A4:A0 = 10000, Main Address 0 D0 = 0)
BIT NAME
SYN_CONFIG_F<19:10> D9:D0
BIT LOCATION
(D0 = LSB)
DESCRIPTION
Fractional Divide Ratio MSBs
1110000000 = Default
Table 13. Main Address 17: (A4:A0 = 10001, Main Address 0 D0 = 0)
BIT NAME
SYN_CONFIG_F<9:0> D9:D0
BIT LOCATION
(D0 = LSB)
DESCRIPTION
Fractional Divide Ratio LSBs
0000000000 = Default
Table 14. Main Address 18: (A4:A0 = 10010, Main Address 0 D0 = 0)
BIT NAME
RESERVED D9:D8 Reserved bits; set to default
XTAL_TUNE<7:0> D7:D0
BIT LOCATION
(D0 = LSB)
DESCRIPTION
Crystal Oscillator Frequency Tuning
00000000 = Minimum frequency 10000000 = Default 11111111 = Maximum frequency
Table 15. Main Address 19: (A4:A0 = 10011, Main Address 0 D0 = 0)
BIT NAME
RESERVED D9:D8 Reserved bits; set to default
VAS_RELOCK_SEL D7
VAS_MODE D6
28 _____________________________________________________________________________________
BIT LOCATION
(D0 = LSB)
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 Subband Select
0 = By VAS_SPI<5:0> (Main address 19 D5:D0) 1 = By on-chip VCO autoselect (VAS) (default)
5GHz, 4-Channel MIMO Transmitter
Table 15. Main Address 19: (A4:A0 = 10011, Main Address 0 D0 = 0) (continued)
MAX2850
BIT NAME
VAS_SPI<5:0> D5:D0
BIT LOCATION
(D0 = LSB)
DESCRIPTION
VCO Autoselect Sub-Band Input
Select VCO sub-band when VAS_MODE (Main address 19 D6) = 0. Select initial VCO sub-band for autoacquisition when VAS_MODE = 1. 000000 = Minimum frequency sub-band
…
011111 = Default
…
111111 = Maximum frequency sub-band
Read VCO Autoselect Tune Voltage ADC Output
Active when VCO_VAS_RB (Main address 27 D5) = 1.
VAS_ADC<2:0>
(Readback Only)
VCO_BAND<5:0>
(Readback Only)
D8:D6
D5:D0
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 VCO_VAS_RB (Main address 27 D5) = 1.
Table 16. Main Address 21: (A4:A0 = 10101, Main Address 0 D0 = 0)
BIT NAME
RESERVED D9:D0 Reserved bits; set to default
DIE_ID<2:0>
(Readback Only)
BIT LOCATION
(D0 = LSB)
D7:D5
DESCRIPTION
Read Revision ID at Main Address 21 D7:D5
Active when DIE_ID_READ (Main address 27 D9) = 1. 000 = Pass1 001 = Pass2
…
Table 17. Main Address 27: (A4:A0 = 11011, Main Address 0 D0 = 0)
BIT NAME
DIE_ID_READ D9
RESERVED D8:D6 Reserved bits, set to default
VAS_VCO_READ D5
RESERVED D4:D0 Reserved bits; set to default
______________________________________________________________________________________ 29
BIT LOCATION
(D0 = LSB)
DESCRIPTION
Die ID Readback Select
0 = Main address 21 D9:D0 reads its own values (default) 1 = Main address 21 D7:D5 reads revision ID
VAS ADC and VCO Sub-Band Readback Select
0 = Main address 19 D9:D0 reads its own values (default). 1 = Main address 19 D8:D6 reads VAS_ADC<2:0>; Main address 19 D5:D0 reads VCO_BAND<5:0>.
5GHz, 4-Channel MIMO Transmitter
Table 18. Main Address 28: (A4:A0 = 11100, Main Address 0 D0 = 0)
BIT NAME
RESERVED D9:D4 Reserved bits; set to default
MAX2850
PA_BIAS_DLY<3:0> D3:D0
BIT LOCATION
(D0 = LSB)
DESCRIPTION
PA_BIAS Turn-On Delay
0000 = 0Fs 0001 = 0Fs 0010 = 0.5Fs 0011 = 1.0Fs (default)
…
1111 = 7.0Fs
Table 19. Local Address 27: (A4:A0 = 11011, Main Address 0 D0 = 1)
BIT NAME
RESERVED D9:D3 Reserved bits, set to default
TX_AMD_BB_GAIN D2
TX_AMD_RF_GAIN D1:D0
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
30 _____________________________________________________________________________________
5GHz, 4-Channel MIMO Transmitter
Typical Operating Circuit
TXRF1
OUTPUT
2.0nH
MAX2850
TXRF2
OUTPUT
TXRF3
OUTPUT
2.4nH
2.4nH
1.0pF 1.0nF
CC_UCX1
V
3.6nH
10nF
PA_BIAS1
TXRF1-
TXRF1+
PA_DET1
TXBBQ1-
TXBBQ1+
TXBBI1-
TXBBI1+
VCC_BB1
TXBBQ2-
TXBBQ2+
TXBBI2-
68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52
V
CC_UCX1
3.9nH
3.9nH
V
CC_UCX2
PA_DET2
PA_BIAS2
V
CC_PA_BIAS
PA_BIAS3
PA_DET3
V
CC_UCX3
V
CC_UCX4
TXRF2+
TXRF2-
V
CC_LO
TXRF3+
TXRF3+
1
2
3
GND
4
5
6
GND
7
8
TXRF1+/­TXRF2+/-
9
TXRF3+/­TXRF4+/-
10
11
12
13
14
GND
15
16
17
AM
DETECTOR
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
GND
PA_BIAS4
TXRF4+
TXRF4-
4.3nH
PA_DET1 PA_DET2 PA_DET3 PA_DET4
0˚
90˚
AMD+/-
CC_LNA
V
PA_DET4
1nF
TXRF4+/-
RXRF-
MAX2850
PA
DETECT
MUX
RF
RSSI
RXRF+
CC_MXR
V
10nF 100nF
CC_BB2
V
1nF
1nF
V
CC_UCX2
1.2pF
1.0nF
0.1µF
V
CC_UCX3
1nF
1.2pF
1.0nF
1nF
1nF
TXBBI2+
0˚90˚
TXBBI4-
TXBBI4+
TXBBQ4+
40MHz
XTAL
5.6pF
39pF
ENABLE
XTAL_CAP
XTAL
CRYSTAL OSCILLATOR/BUFFER
PHASE-LOCKED LOOP
BB
RSSI
RSSI
MUX
AMD+/-
DOUT
SERIAL
INTERFACE
CS
TXBBQ4-
SCLK
1nF
1µF
CC_XTAL
V
CLKOUT
51
DOUT
50
V
CC_DIG
49
30I
CPOUT-
48
33pF
30
CPOUT+
47
GND_VCO
46
BYP_VCO
45
V
44
RSSI
43
RXBBQ-
42
RXBBQ+
41
RXBBI-
40
RXBBI+
39
TXBBQ3-
38
TXBBQ3+
37
TXBBI3-
36
TXBBI3+
35
DIN
I
CC_VCO
10nF
PLL LOOP FILTER
2.2nF
10nF
1µF
1.0pF 20pF
1.3nH
RXRF4
OUTPUT
TQFN
CC_UCX4
V
TXRF4
OUTPUT
1.0pF 1.0nF
2.4nH
______________________________________________________________________________________ 31
5GHz, 4-Channel MIMO Transmitter
Chip Information
PROCESS: BiCMOS
MAX2850
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
32 _____________________________________________________________________________________
5GHz, 4-Channel MIMO Transmitter
Revision History
MAX2850
REVISION
NUMBER
0 10/09 Initial release — 1 3/10 Modified EC table to support single-pass room test flow 2, 3, 5, 6, 8
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 33
©
2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
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