The MAX2839 direct conversion, zero-IF, RF transceiver
is designed specifically for 2GHz 802.16e MIMO mobile
WiMAX systems. The device incorporates one transmitter and two receivers, with >40dB isolation between
each receiver. The MAX2839 completely integrates all
circuitry required to implement the RF transceiver function, providing RF to baseband receive path, and baseband to RF transmit path, VCO, frequency synthesizer,
crystal oscillator, and baseband/control interface. The
device includes a fast-settling sigma-delta RF synthesizer with smaller than 40Hz frequency steps and a
crystal oscillator that allows the use of a low-cost crystal
in place of a TCXO. The transceiver IC also integrates
circuits for on-chip DC-offset cancellation, I/Q error,
and carrier leakage detection circuits. An internal transmit to receive loopback mode allows for receiver I/Q
imbalance calibration. The local oscillator I/Q quadrature phase error can be digitally corrected in approximately 0.125° steps. Only an RF bandpass filter (BPF),
crystal, RF switch, PA, and a small number of passive
components are needed to form a complete wireless
broadband RF radio solution.
The MAX2839 completely eliminates the need for an
external SAW filter by implementing on-chip programmable monolithic filters for both the receiver and transmitter, for all 2GHz and 802.16e profiles and WIBRO.
The baseband filters along with the Rx and Tx signal
paths are optimized to meet the stringent noise figure
and linearity specifications. The device supports up to
2048 FFT OFDM and implements programmable channel filters for 3.5MHz to 20MHz RF channel bandwidths.
The transceiver requires only 2µs Tx-Rx switching time.
The IC is available in a small 56-pin TQFN package
measuring 8mm x 8mm x 0.8mm.
Applications
802.16e Mobile WiMAX™ Systems
Korean WIBRO Systems
Proprietary Wireless Broadband Systems
802.11g or n WLAN with MRC or MIMO Down Link
Features
♦ 2.3GHz to 2.7GHz Wideband Operation
♦ Dual Receivers for MIMO, Single Transmitter
♦ Complete RF Transceiver, PA Driver, and Crystal
Oscillator
2.3dB Rx Noise Figure on Each Receiver
-35dB Rx EVM for 64QAM Signal
0dBm Linear OFDM Transmit Power (64QAM)
-70dBr Tx Spectral Emission Mask
-35dBc LO Leakage
Automatic Rx DC Offset Correction
Monolithic Low-Noise VCO with -39dBc
Filters
Sigma-Delta Fractional-N PLL with < 40Hz Step
62dB Tx Gain Control Range with 1dB Step
Size, Digitally Controlled
95dB Rx Gain Control Range with 1dB Step
Size, Digitally Controlled
60dB Analog RSSI Instantaneous Dynamic
Range
4-Wire SPI™ Digital Interface
I/Q Analog Baseband Interface
Digital Tx/Rx Mode Control
Digitally Tuned Crystal Oscillator
On-Chip Digital Temperature Sensor Readout
♦ +2.7V to +3.6V Transceiver Supply
♦ Low-Power Shutdown Current
♦ Small, 56-Pin TQFN Package (8mm x 8mm x
0.8mm)
MAX2839
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
(MAX2839 Evaluation Kit, VCC_ = 2.7V to 3.6V, TA= -40°C to +85°C, Rx set to the maximum gain. RXTX set according to operating
mode, ENABLE = CS = high, SCLK = DIN = low, no input signal at RF inputs, all RF inputs and outputs terminated into 50Ω.
90mV
RMS
differential I and Q signals (1MHz) applied to I, Q baseband inputs of transmitter in transmit mode, all registers set to rec-
ommended settings and corresponding test mode, unless otherwise noted. Typical values are at V
CC_
= 2.8V, fLO= 2.5GHz and
T
A
= +25°C, unless otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ABSOLUTE MAXIMUM RATINGS
V
CC_
Pins to GND..................................................-0.3V to +3.6V
RF Inputs: RXINA+, RXINA-, RXINB+,
RXINB- to GND .............................................AC-Coupled Only
RF Outputs: TXOUT+, TXOUT- to GND.................-0.3V to +3.6V
Analog Inputs: TXBBI+, TXBBI-, TXBBQ+,
TXBBQ- to GND..................................................-0.3V to +3.6V
Analog Input: REFCLK, XTAL1 .........................-0.3V to +3.6V
P-P
Analog Outputs: RXBBIA+, RXBBIA-, RXBBQA+, RXBBQA-,
RXBBIB+, RXBBIB-, RXBBQB+, RXBBQB-, CPOUT+,
CPOUT-, PABIAS, RSSI to GND.........................-0.3V to +3.6V
Digital Inputs: RXTX, CS, SCLK, DIN,
B0–B7, LOAD, RXHP, ENABLE to GND .............-0.3V to +3.6V
Digital Outputs: DOUT, CLKOUT ..........................-0.3V to +3.6V
Bias Voltages: VCOBYP .......................................-0.3V to +3.6V
Short-Circuit Duration on All Output Pins ...............................10s
RF Input Power: All RXIN_ ..............................................+15dBm
RF Output Differential Load VSWR: All TXOUT .......................6:1
(MAX2839 Evaluation Kit, VCC_ = 2.7V to 3.6V, TA= -40°C to +85°C, Rx set to the maximum gain. RXTX set according to operating
mode, ENABLE = CS = high, SCLK = DIN = low, no input signal at RF inputs, all RF inputs and outputs terminated into 50Ω.
90mV
RMS
differential I and Q signals (1MHz) applied to I, Q baseband inputs of transmitter in transmit mode, all registers set to rec-
ommended settings and corresponding test mode, unless otherwise noted. Typical values are at V
CC_
= 2.8V, fLO= 2.5GHz and
T
A
= +25°C, unless otherwise noted.) (Note 1)
AC ELECTRICAL CHARACTERISTICS TABLE—Rx MODE
(MAX2839 Evaluation Kit, V
CC_
= 2.8V, TA= +25°C, fRF= 2.4999GHz, fLO= 2.5GHz; baseband output signal frequency = 100kHz,
f
REF
= 40MHz, ENABLE = RXTX = CS = high, SCLK = DIN = low, with power matching for the differential RF pins using the typical
applications circuit and registers set to default settings and corresponding test mode, unless otherwise noted. Lowpass filter is set
to 10MHz RF channel BW. Unmodulated single tone RF input signal is used with specifications which normally apply over the entire
operating conditions, unless otherwise indicated.) (Note 1)
Digital Input Current Low, I
LOGIC OUTPUTS: DOUT, CLKOUT
Digital Output Voltage High, V
Digital Output Voltage Low, V
PARAMETERCONDITIONSMINTYPMAXUNITS
IL
Sourcing 100µA
OH
Sinking 100µA0.4V
OL
V
-1+1µA
-
CC
0.4
V
RF INPUT TO I, Q BASEBAND-LOADED OUTPUT
RF Input Frequency Range2.32.7GHz
Peak-to-Peak Gain Variation over
RF Input Frequency Range
RF Input Return LossAll LNA settings12dB
Total Voltage Gain
Gain Change Settling Time
Baseband Gain Range
Baseband Gain Minimum Step
Size
DSB Noise Figure
PARAMETERCONDITIONSMINTYPMAXUNITS
Tested at band edges and band center0.8dB
T
= -40°C to
A
+85°C
From max RF gain to max RF gain - 8dB8
From max RF gain to max RF gain - 16dB16RF Gain Steps
From max RF gain to max RF gain - 32dB32
Any RF or baseband gain change; gain settling to within
±1dB of steady state; RXHP = 1
Any RF or baseband gain change; gain settling to within
±0.1dB of steady state; RXHP = 1
From maximum baseband gain (B5:B0 = 000000) to
minimum gain (B5:B0 = 111111), T
Voltage gain = 65dB with max RF gain (B7:B6 = 00)2.3
V ol tag e g ai n = 50d B w i th m ax RF g ai n - 8d B ( B7:B6 = 01) 5.5
Voltage gain = 45dB with max RF gain - 16dB
(B7:B6 = 10)
Voltage gain = 15dB with max RF gain - 32dB
(B7:B6 = 11)
Maximum gain, B7:B0 = 00000009099
Minimum gain, B7:B0 = 1111111513
200
2000
= -40°C to +85°C
A
586366dB
1dB
13
27
dB
dB
ns
dB
MAX2839
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
AC ELECTRICAL CHARACTERISTICS TABLE—Rx MODE (continued)
(MAX2839 Evaluation Kit, V
CC_
= 2.8V, TA= +25°C, fRF= 2.4999GHz, fLO= 2.5GHz; baseband output signal frequency = 100kHz,
f
REF
= 40MHz, ENABLE = RXTX = CS = high, SCLK = DIN = low, with power matching for the differential RF pins using the typical
applications circuit and registers set to default settings and corresponding test mode, unless otherwise noted. Lowpass filter is set to
10MHz RF channel BW. Unmodulated single tone RF input signal is used with specifications which normally apply over the entire
operating conditions, unless otherwise indicated.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
Out-of-Band Input IP3 (Note 2)
Inband Input P-1dB
Maximum Output Signal Level
I/Q Gain Imbalance100kHz IQ baseband output; 1 σ variation0.1dB
I/Q Phase Error100kHz IQ baseband output; 1 σ variation0.125Degrees
Rx I/Q Output Load Impedance
(R || C)
Loopback Gain (for Receiver I/Q
Calibration)
AGC set for -65dBm wanted signal, max RF gain
(B7:B6 = 00)
AGC set for -55dBm wanted signal, max RF gain - 8dB
(B7:B6 = 01)
AGC set for -40dBm wanted signal, max RF gain - 16dB
(B7:B6 = 10)
AGC set for -30dBm wanted signal, max RF gain - 32dB
(B7:B6 = 11)
Max RF gain (B7:B6 = 00)-37
Max RF gain - 8dB (B7:B6 = 01)-29
Max RF gain - 16dB (B7:B6 = 01)-21
Max RF gain - 32dB (B7:B6 = 11)-4
Over passband frequency range; at any gain setting;
1dB compression point
Minimum differential resistance10kΩ
Maximum differential capacitance5pF
Transmitter I/Q input to receiver I/Q output; transmitter
B6:B1 = 000011, receiver B5:B0 = 101000 programmed
through SPI
-50+5dB
-13
-9
-7
+16
1.5V
dBm
dBm
P-P
After switching RXHP to 0; average over 1µs after any
I/Q Output DC Droop
I/Q Static DC Offset
Isolation Between Rx Channels A
and B
RECEIVER BASEBAND FILTERS
Baseband Highpass Filter Corner
Frequency
gain change, or 2µs after receive enabled with 100Hz
AC-coupling
No RF input signal; measure at 3µs after receive enable;
RXHP = 1 for 0 to 2µs and set to 0 after 2µs, 1 σ variation
AC ELECTRICAL CHARACTERISTICS TABLE—Rx MODE (continued)
(MAX2839 Evaluation Kit, V
CC_
= 2.8V, TA= +25°C, fRF= 2.4999GHz, fLO= 2.5GHz; baseband output signal frequency = 100kHz,
f
REF
= 40MHz, ENABLE = RXTX = CS = high, SCLK = DIN = low, with power matching for the differential RF pins using the typical
applications circuit and registers set to default settings and corresponding test mode, unless otherwise noted. Lowpass filter is set to
10MHz RF channel BW. Unmodulated single tone RF input signal is used with specifications which normally apply over the entire
operating conditions, unless otherwise indicated.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
RF Channel BW Supported by
Baseband Filter
Baseband Gain Ripple
Baseband Group Delay Ripple
Baseband Filter Rejection for
5MHz RF Channel BW
Baseband Filter Rejection for
10MHz RF Channel BW
RSSI
RSSI Minimum Output VoltageR
RSSI Maximum Output VoltageR
RSSI Slope30mV/dB
RSSI Output Settling TimeTo within 3dB of steady state
A4:A0 = 00100 serial bits D9:D6 = 00001.75
A4:A0 = 00100 serial bits D9:D6 = 00012.25
A4:A0 = 00100 serial bits D9:D6 = 00103.5
A4:A0 = 00100 serial bits D9:D6 = 00115.0
A4:A0 = 00100 serial bits D9:D6 = 01005.5
A4:A0 = 00100 serial bits D9:D6 = 01016.0
A4:A0 = 00100 serial bits D9:D6 = 01107.0
A4:A0 = 00100 serial bits D9:D6 = 01118.0
A4:A0 = 00100 serial bits D9:D6 = 10009.0
A4:A0 = 00100 serial bits D9:D6 = 100110.0
A4:A0 = 00100 serial bits D9:D6 = 101012.0
A4:A0 = 00100 serial bits D9:D6 = 101114.0
A4:A0 = 00100 serial bits D9:D6 = 110015.0
A4:A0 = 00100 serial bits D9:D6 = 110120.0
A4:A0 = 00100 serial bits D9:D6 = 111024.0
A4:A0 = 00100 serial bits D9:D6 = 111128.0
0 to 2.3MHz for BW = 5MHz1.3
0 to 4.6MHz for BW = 10MHz1.3
0 to 2.3MHz for BW = 5MHz90
0 to 4.6MHz for BW = 10MHz50
At 3.3MHz6
At > 21MHz85
At 6.7MHz6
At > 41.6MHz85
≥ 10kΩ0.4V
LOAD
≥ 10kΩ2.2V
LOAD
+32dB signal step200
-32dB signal step800
MHz
dB
ns
dB
dB
ns
P-P
P-P
MAX2839
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
SCLK = DIN = low, with power matching for the differential RF pins using the typical applications and registers set to default settings
and corresponding test mode, unless otherwise noted. Lowpass filter is set to 10MHz RF channel BW. 1MHz 90mV
RMS
cosine and
sine signals applied to I/Q baseband inputs of transmitter (differential DC coupled)). (Note 1)
Tx BASEBAND I/Q INPUTS TO RF OUTPUTS
RF Output Frequency Range2.32.7GHz
Peak-to-Peak Peak Gain Variation
over RF Band
Total Voltage GainMax gain -3dB; at unbalanced 50Ω matched output12dB
Max Output Power over
Frequency for Any Given 200MHz
Band
PARAMETERCONDITIONSMINTYPMAXUNITS
Output optimally matched over 200MHz RF BW2.5dB
64 QAM OFDM signal conforming to spectral emission
mask and -36dB EVM after I/Q imbalance calibration by
modem (Note 3)
0dBm
RF Output Return Loss
RF Gain Control RangeB6:B1 = 000000 to 11111162dB
Unwanted Sideband Suppression
RF Gain Control Binary Weights
Carrier Leakage
Tx I/Q Input Impedance (R||C)
Baseband Frequency Response
for 5MHz RF Channel BW
Baseband Frequency Response
for 10MHz RF Channel BW
Baseband Group Delay Ripple
Given 200MHz band in the 2.3GHz to 2.7GHz range, for
which the matching has been optimized
Without calibration by modem, and excludes modem I/Q
imbalance; P
B11
B22
B34
B48
B516
B632
Relative to 0dBm output power; without calibration by
modern
Differential resistance100kΩ
Differential capacitance0.5pF
0 to 2.3MHz0.2
At > 25MHz80
0 to 4.6MHz0.2
At > 41.6MHz80
0 to 2.3MHz (BW = 5MHz)20
0 to 4.6MHz (BW = 10MHz)12
OUT
= 0dBm
8dB
45dBc
-35dBc
dB
dB
ns
MAX2839
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
= +85°C. Min/max limits at TA= -40°C and TA= +25°C are guaranteed by
design and characterization. The power-on register settings are not production tested. Load register setting 500ns after
V
CC
is applied.
Note 2: Two tones at +20MHz and +39MHz offset with -35dBm/tone. Measure IM3 at 1MHz.
Note 3: Gain adjusted over max gain and max gain -3dB. Optimally matched over given 200MHz band.
Note 4: Tx mode supply current is specified for 64 QAM while achieving the Tx output spectrum mask shown in the
Typical Operating
Characteristics
. The supply current can be reduced for 16 QAM signal by adjusting the Tx bias settings through the SPI.
LOAD Falling Edge Setup TimeB7:B0 stable to LOAD falling edge10ns
LOAD Falling Edge Hold TimeLOAD falling edge to B7:B0 stable10ns
LOAD Rise and Fall TimeBetween 10% and 90% of static levels100ns
4-WIRE SERIAL PARALLEL 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 Timet
DIN to SCLK Hold Timet
SCLK Pulse-Width Hight
SCLK Pulse-Width Lowt
Last Rising Edge of SCLK to
Rising Edge of CS or Clock to
Load Enable Setup Time
CS High Pulse Widtht
Time Between Rising Edge of CS
and the Next Rising Edge of
SCLK
Clock Frequencyf
Rise Timet
Fall Timet
SCLK Falling Edge to Valid DOUTt
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
t
CSO
t
CSS
DS
DH
CH
CL
t
CSH
CSW
t
CS1
CLK
R
F
D
6ns
6ns
6ns
6ns
6ns
6ns
6ns
20ns
6ns
45MHz
0.1/f
CLK
0.1/f
CLK
12.5ns
ns
ns
MAX2839
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
2VCCRXLNA_A Receiver A LNA Supply Voltage. Bypass with a 22pF capacitor as close as possible to the pin.
3B0Receiver Gain-Control Logic Input Bit 0
4LOAD
5VCCRXLNA_B Receiver B LNA Supply Voltage. Bypass with a 22pF capacitor as close as possible to the pin.
6GNDRXLNA_B Receiver B LNA Ground
7RXINB+
8RXINB-
9B4Receiver and Transmitter Gain-Control Logic Input Bit 4
10B3Receiver and Transmitter Gain-Control Logic Input Bit 3
11VCCTXPADSupply Voltage for Transmitter PA Driver. Bypass with a 22pF capacitor as close as possible to the pin.
12B2Receiver and Transmitter Gain-Control Logic Input Bit 2
13TXOUT+
14TXOUT-
15B1Receiver and Transmitter Gain-Control Logic Input Bit 1
16B5Receiver and Transmitter Gain-Control Logic Input Bit 5
17PABIASTransmit External PA Bias DAC Output
18VCCTXMXTransmitter Upconverter Supply Voltage. Bypass with a 22pF capacitor as close as possible to the pin.
19SCLKSerial-Clock Logic Input of 4-Wire Serial Interface
20ENABLETransceiver Enable
21CLKOUTReference Clock Buffer Output
22REFCLKCrystal or Reference Clock Input. AC-couple a crystal or a reference clock to this analog input.
23XTAL1XTAL Input. Connect the other terminal of the XTAL to this pin.
24VCCXTALCrystal Oscillator Supply Voltage. Bypass with a 100nF capacitor as close as possible to the pin.
25VCCCPPLL Charge-Pump Supply Voltage. Bypass with a 100nF capacitor as close as possible to the pin.
26GNDCPCharge-Pump Circuit Ground
27CPOUT+
28CPOUT-
29GNDVCOVCO Ground
30VCOBYP
31VCCVCOVCO Supply Voltage. Bypass with a 22nF capacitor as close as possible to the pin.
32CSChip-Select Logic Input of 4-Wire Serial Interface
33DOUTData Logic Output of 4-Wire Serial Interface
34DINData Logic Input of 4-Wire Serial Interface
35RXBBIB-
36RXBBIB+
37RXBBQB-
38RXBBQB+
Receiver Gain Select. Positive edge trigger latches digital gain inputs B0–B7 to receive A. Negative
edge trigger latches digital gain inputs B0–B7 to receive B.
Receiver B LNA Differential Input. Input is internally DC-coupled.
Power Amplifier Driver Differential Output. The pins have internal AC blocking capacitors.
Differential Charge-Pump Output. Connect the frequency synthesizer’s loop filter between these pins
(see the Typical Operating Circuit).
On-Chip VCO Regulator Output Bypass. Bypass with a 1µF capacitor to GND. Do not connect other
circuitry to this pin.
Receiver B Baseband I-Channel Differential Outputs
Receiver B Baseband Q-Channel Differential Outputs
MAX2839
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
Receiver Downconverters Supply Voltage. Bypass with a 22pF capacitor as close as possible to the
pin.
Receiver A LNA Differential Input. Input is internally DC-coupled.
Exposed Paddle. Internally connected to GND. Connect to a large ground plane for optimum RF
performance and enhanced thermal dissipation. Not intended as an electrical connection point.
MAX2839
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
The modes of operation for the MAX2839 are shutdown,
clock-out only, standby, receive, transmit, transmitter
calibration and receiver calibration. See Table 1 for a
summary of the modes of operation. When the parts are
active, various blocks can be shutdown individually by
programming different SPI registers.
Shutdown Mode
The MAX2839 features a low-power shutdown mode. In
shutdown mode, all circuit blocks are powered down,
except the 4-wire serial bus and its internal programmable registers.
Clock-Out Only
In clock-out mode, the entire transceiver is off except
the divided reference clock output on the CLKOUT pin
and the clock divider, which remains on.
Standby Mode
The standby mode is used to enable the frequency
synthesizer block while the rest of the device is powered down. In this mode, PLL, VCO, and LO generator
are on so that Tx or Rx modes can be quickly enabled
from this mode. These and other blocks can be selectively enabled in this mode by programming different
SPI registers.
Receive (Rx) Mode
In receive mode, all Rx circuit blocks are powered on
and active. Antenna signal is applied; RF is downconverted, filtered, and buffered at Rx BB I and Q outputs.
Either receiver A or both receivers can be enabled.
Receiver B cannot be enabled by itself.
Transmit (Tx) Mode
In transmit mode, all Tx circuit blocks are powered on.
The external PA is powered on after a programmable
delay using the on-chip PA bias DAC.
Transmitter (Tx) Calibration Mode
All Tx circuit blocks except PA driver and external PA
are powered on and active. The AM detector and
receiver I/Q channel buffers are also ON, along with
multiplexers in receiver side to route this AM detector’s
signal to each I and Q differential outputs.
Table 1. Operating Mode
MODE CONTROL LOGIC INPUTSCIRCUIT BLOCK STATES
MODE
Shutdown 0 0 X XX Off Off Off None Off
Clock-Out Only 1 X X X0 Off Off Off None On
Clock-Out Only X 1 X X0 Off Off Off None On
Standby 0 1 X 01 Off Off On or Off None On
Rx (1x2 MIMO) 1 1 1 01 On Off On None On
Rx (1x1 SISO) 1 1 0 01 On (RxA) Off On None On
Tx 1 0 X 01 Off On On None On
Tx Calibration 1 0 X 11 Off
ENABLE
PIN
RXTX
PIN
SPI
REG1
D<3>
SPI
REG16
D<1:0>
Rx PATHTx PATH
On (except
PA driver)
PLL, VCO, LO
GEN
On
CALIBRATION
SECTIONS ON
AM detector + Rx
I, Q buffers
CLOCK
OUTPUT
On
RxA Calibration
(Loopback)
RxB Calibration
(Loopback)
1 1 0 11
1 1 1 11
(except
(except
On
LNA)
On
LNA)
On (except
PA driver)
On (except
PA driver)
On Loopback On
On Loopback On
MAX2839
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
Part of Rx and Tx circuit blocks except LNA and PA driver are powered on and active. The transmitter I/Q
input signals are upconverted to RF, and the output of
the Tx gain control block (VGA) is fed to the receiver at
the input of the downconverter. Either receiver A or
both receivers can be connected to the transmitter and
powered on. The I/Q lowpass filters are not present in
the transmitter signal path (they are bypassed).
Programmable Registers
and 4-Wire SPI Interface
The MAX2839 includes 32 programmable 16-bit registers. The most significant bit (MSB) is the read/write
selection bit. The next 5 bits are register address. The
10 least significant bits (LSBs) are register data.
Register data is loaded through the 4-wire
SPI/MICROWIRE™-compatible serial interface. Data at
DIN is shifted in MSB 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. During the read mode,
register data selected by address bits is shifted out to
DOUT at the falling edges of the clock. At the CS rising
edge, the 10-bit data bits are latched into the register
selected by address bits. See Figure 1. The register
values are preserved in shutdown mode as long as the
power-supply voltage is maintained. However, every
time the power-supply voltage is turned on, the registers are reset to the default values.
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
.)
56L THIN QFN.EPS
PACKAGE OUTLINE
56L THIN QFN, 8x8x0.8mm
21-0135
1
F
2
MAX2839
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages
.)
PACKAGE OUTLINE
56L THIN QFN, 8x8x0.8mm
21-0135
2
F
2
MAX2839
2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
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.
26
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600