19-1049; Rev 1; 8/08
3.3GHz to 3.9GHz
Wireless Broadband RF Transceiver
General Description
The MAX2838 direct-conversion, zero-IF, RF transceiv-
er is designed specifically for 3.3GHz to 3.9GHz wire-
less broadband systems. The MAX2838 completely
integrates all circuitry required to implement the RF
transceiver function, providing RF-to-baseband receive
path, baseband-to-RF transmit path, VCO, frequency
synthesizer, and baseband/control interface. The
device includes a fast-settling sigma-delta RF synthe-
sizer with smaller than 29Hz frequency steps. The
MAX2838 supports 2Tx, 2Rx MIMO applications with a
master device providing coherent LO to the slave
device. The transceiver IC also integrates circuits for
on-chip DC-offset cancellation, I/Q error, and carrier-
leakage detection circuits. Only an RF bandpass filter
(BPF), TCXO, RF switch, PA, and a small number of
passive components are needed to form a complete
wireless broadband RF radio solution.
The MAX2838 completely eliminates the need for an
external SAW filter by implementing on-chip monolithic
filters for both the receiver and transmitter. The base-
band filters along with the Rx and Tx signal paths are
optimized to meet the stringent noise figure and lineari-
ty specifications. The device supports up to 2048-FFT
OFDM and implements programmable channel filters
for 1.5MHz to 28MHz RF channel bandwidths. The
transceiver requires only 2µs Tx-Rx switching time. The
IC is available in a small 48-pin thin QFN package mea-
suring only 6mm x 6mm x 0.8mm.
Features
♦
3.3GHz to 3.9GHz Wide-Band Operation
♦
Master-Slave Modes with Coherent LO for MIMO
♦
Complete RF Transceiver, and PA Driver
0dBm Linear OFDM Transmit Power
-70dBr Tx Spectral Emission Mask
2.8dB Rx Noise Figure
Tx/Rx I/Q Error and LO Leakage Detection and
Adjustment
Automatic Rx DC Offset Correction
Monolithic Low-Noise VCO with -39dBc Integrated
Phase Noise
Programmable Rx I/Q Lowpass Channel Filters
Programmable Tx I/Q Lowpass Anti-Aliasing Filter
Sigma-Delta Fractional-N PLL with 29Hz Step Size
60dB Tx Gain Control Range with 1dB Step Size,
Digitally Controlled
94dB Rx Gain Control Range with 2dB Step Size,
Digitally Controlled
60dB Analog RSSI Instantaneous Dynamic Range
4-Wire SPI™ Digital Interface
I/Q Analog Baseband Interface
Digital Tx/Rx/Shutdown Mode Control
Low-Power CLOCKOUT Mode
On-Chip Digital Temperature Sensor Readout
♦
+2.7V to +3.6V Transceiver Supply
♦
Low-Power Shutdown Mode
♦
Small 48-Pin Thin QFN Package (6mm x 6mm x 0.8mm)
MAX2838
Applications
802.16-2004/802.16d Fixed WiMAX™
TXBBQ+
ENABLE
TXBBQ-
VCCRXMX
RXTX
Pin Configuration
VCCRXVGA
VCCRXFL
RXBBI+
38
TXBBI+
RXBBI-
37
TXBBI-
RXHP
40
802.16e MIMO Mobile WiMAX
WiMAX Pico and Femto Basestations
NLOS Wireless Broadband Systems
+
VCCRXLNA 1
GNDRXLNA 2
B5 3
48
47
46
45
44
43
42
41
39
36 RXBBQ+
35 RXBBQ-
34 B6
33 B7
32 RSSI
WiMAX is a trademark of the WiMAX Forum.
SPI is a trademark of Motorola, Inc.
RXRF+ 4
RXRF- 5
B4 6
VCCTXPAD 7
MAX2838
31 DIN
30 DOUT
29 EXTVCO+
28 EXTVCO-
27 VCCLO
26 VCCVCO
25 VCOBYP
Ordering Information
PART
MAX2838ETM+T
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
48 TQFN-EP*
B3 8
B2 9
TXRF+ 10
TXRF- 11
B1 12
VCCTMX
CLKOUT
VCCDIG
CS
SCLK
REFCLK
VCCCP
GNDCP
CPOUT+
48 THIN QFN
________________________________________________________________
Maxim Integrated Products
GNDVCO
PABIAS
CPOUT-
*EP
= Exposed paddle.
+Denotes
a lead-free package.
T = Tape and reel.
13
14
15
16
17
18
19
20
21
22
23
24
1
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.
3.3GHz to 3.9GHz
Wireless Broadband RF Transceiver
MAX2838
ABSOLUTE MAXIMUM RATINGS
V
CC_
Pins to GND..................................................-0.3V to +3.6V
RF Inputs: RXRF+, RXRF-, EXTVCO+,
EXTVCO- to GND ................................................-0.3V to +3.6V
RF Outputs: TXRF+, TXRF-, EXTVCO+,
EXTVCO- to GND ................................................-0.3V to +3.6V
Analog Inputs: TXBBI+, TXBBI-, TXBBQ+,
TXBBQ-, REFCLK to GND ...................................-0.3V to +3.6V
Analog Outputs: RXBBI+, RXBBI-, RXBBQ+,
RXBBQ-, RSSI, VCOBYP, CPOUT+, CPOUT-,
PABIAS to GND ...................................................-0.3V to +3.6V
Digital Inputs: ENABLE, RXTX,
CS,
SCLK,
DIN, RXHP B1–B7 to GND ..................................-0.3V to +3.6V
Digital Outputs: DOUT, CLKOUT to GND .............-0.3V to +3.6V
Short-Circuit Duration
Analog Outputs: RXBBI+, RXBBI-, RXBBQ+,
RSSI, VCOBYP,RXBBQ-, CPOUT+, CPOUT-,
PABIAS, TXRF-, TXRF+ ......................................................10s
Digital Outputs: DOUT, CLKOUT .........................................10s
RF Input Power: RXRF+, RXRF- .....................................+15dBm
RF Output Differential Load VSWR: TXRF+, TXRF- .................6:1
Continuous Power Dissipation (T
A
= +70°C)
48-Pin Thin QFN (derate 37mW/°C above +70°C) ...... > 2.96W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
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
(MAX2838 Evaluation Kit, V
CC
_ = 2.7V to 3.6V, T
A
= -40°C to +85°C, ENABLE and RXTX set according to operating mode,
CS
=
high, SCLK = DIN = low, transmitter and receiver in maximum gain, no input signal at RF inputs, all RF inputs and outputs terminated
into 50Ω, receiver baseband outputs are open. 90mV
RMS
differential I and Q signals (1MHz) applied to I and Q baseband inputs of
transmitter in transmit mode, all registers set to recommended settings and corresponding test mode, unless otherwise noted.
Typical values are at V
CC
= 2.8V, f
LO
= 3.6GHz, and T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETERS
Supply Voltage
V
CC_
Shutdown mode T
A
= +25°C
Standby mode, Single configuration
see Tables
1 and 2
Rx mode, see
Tables 1 and 2
Supply Current
MIMO master configuration
MIMO slave configuration
Single configuration
MIMO master configuration
MIMO slave configuration
Single configuration
Tx mode, see
Tables 1 and 2
Rx calibration
mode, see
Tables 1 and 2
Tx calibration
mode, see
Tables 1 and 2
MIMO master configuration
MIMO slave configuration
Single configuration
MIMO master configuration
MIMO slave configuration
Single configuration
MIMO master configuration
MIMO slave configuration
0.8
CONDITIONS
MIN
2.7
TYP
2.8
12
35
44
11
103
112
80
152
160
128
142
151
119
111
120
88
1.0
1.1
1.2
1.35
1.2
V
145
182
186
mA
133
52
MAX
3.6
UNITS
V
µA
D9:D8 = 00 in A4:A0 = 00100
Rx I/Q Output Common-Mode
Voltage
D9:D8 = 01 in A4:A0 = 00100
D9:D8 = 10 in A4:A0 = 00100
D9:D8 = 11 in A4:A0 = 00100
2
_______________________________________________________________________________________
3.3GHz to 3.9GHz
Wireless Broadband RF Transceiver
DC ELECTRICAL CHARACTERISTICS (continued)
(MAX2838 Evaluation Kit, V
CC
_ = 2.7V to 3.6V, T
A
= -40°C to +85°C, ENABLE and RXTX set according to operating mode,
CS
=
high, SCLK = DIN = low, transmitter and receiver in maximum gain, no input signal at RF inputs, all RF inputs and outputs terminated
into 50Ω, receiver baseband outputs are open. 90mV
RMS
differential I and Q signals (1MHz) applied to I and Q baseband inputs of
transmitter in transmit mode, all registers set to recommended settings and corresponding test mode, unless otherwise noted.
Typical values are at V
CC
= 2.8V, f
LO
= 3.6GHz, and T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETERS
Tx Baseband Input Common-
Mode Voltage Operating Range
Tx Baseband Input Bias Current
Digital Input Voltage High, V
IH
Digital Input Voltage Low, V
IL
Digital Input Current High, I
IH
Digital Input Current Low, I
IL
LOGIC OUTPUTS: DOUT
Digital Output Voltage High, V
OH
Digital Output Voltage Low, V
OL
Sourcing 100µA
Sinking 100µA
V
CC
- 0.4
0.4
V
V
-1
-1
DC-coupled
Source current
V
CC
- 0.4
0.4
+1
+1
CONDITIONS
MIN
0.5
8
TYP
MAX
1.2
20
UNITS
V
µA
V
V
µA
µA
MAX2838
LOGIC INPUTS: ENABLE, RXTX, SCLK, DIN,
CS,
B1:B7, RXHP
AC ELECTRICAL CHARACTERISTICS—Rx MODE
(MAX2838 Evaluation Kit, V
CC
_ = 2.8V, T
A
= +25°C, f
LO
= 3.6GHz, f
RF
= 3.601GHz, receiver baseband I/Q outputs at 90mV
RMS
, f
REF
= 40MHz,
CS
= ENABLE = RXTX = high, SCLK = DIN = low, channel bandwidth BW = 7MHz, with power matching for the RF inputs
using the typical applications and registers set to default settings and corresponding test mode, unless otherwise noted.
Unmodulated single-tone RF input signal is used with specifications that normally apply over the entire operating conditions, unless
otherwise indicated. Rx I/Q differential output load impedance = 10kΩ || 8pF.) (Note 1)
PARAMETER
RF Input Frequency Range
Peak-to-Peak Gain Variation over
RF Input Frequency Range
RF Input Return Loss
Total Voltage Gain
Tested at band edges and band center
All LNA settings
T
A
= -40°C to +85°C
Maximum gain, B7:B1 = 0000000
Minimum gain, B7:B1 = 1111111
88
CONDITIONS
MIN
3.3
1.8
10
98
5
8
16
32
200
ns
500
62
2
dB
dB
dB
10
TYP
MAX
3.9
UNITS
GHz
dB
dB
dB
RECEIVER SECTION: LNA RF INPUT TO BASEBAND I/Q OUTPUTS
From max RF gain to max RF Gain - 8dB
RF Gain Steps
From max RF gain to max RF gain - 16dB
From max RF gain to max RF gain - 32dB
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:B1 = 00000) to minimum
baseband gain (B5:B1 = 11111)
Gain Change Settling Time
Baseband Gain Range
Baseband Gain Minimum Step Size
_______________________________________________________________________________________
3
3.3GHz to 3.9GHz
Wireless Broadband RF Transceiver
MAX2838
AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued)
(MAX2838 Evaluation Kit, V
CC
_ = 2.8V, T
A
= +25°C, f
LO
= 3.6GHz, f
RF
= 3.601GHz, receiver baseband I/Q outputs at 90mV
RMS
, f
REF
= 40MHz,
CS
= ENABLE = RXTX = high, SCLK = DIN = low, channel bandwidth BW = 7MHz, with power matching for the RF inputs
using the typical applications and registers set to default settings and corresponding test mode, unless otherwise noted.
Unmodulated single-tone RF input signal is used with specifications that normally apply over the entire operating conditions, unless
otherwise indicated. Rx I/Q differential output load impedance = 10kΩ || 8pF.) (Note 1)
PARAMETER
CONDITIONS
Voltage gain
≥
65dB with max RF gain (B7:B6 = 00)
DSB Noise Figure
Voltage gain = 50dB with max RF gain - 8dB (B7:B6 = 01)
Voltage gain = 45dB with max RF gain - 16dB (B7:B6 = 10)
Voltage gain = 15dB with max RF gain - 32dB (B7:B6 = 11)
Max RF gain (B7:B6 = 00)
In-Band Input P-1dB
Max RF gain - 8dB (B7:B6 = 01)
Max RF gain - 16dB (B7:B6 = 10)
Max RF gain - 32dB (B7:B6 = 11)
Maximum Output Signal Level
Over passband frequency range; at any gain setting;
1dB compression point, differential output
Max RF gain (B7:B6 = 00), AGC set for -65dBm wanted
signal
Max RF gain - 8dB (B7:B6 = 01), AGC set for -55dBm
wanted signal
Max RF gain - 16dB (B7:B6 = 10), AGC set for -40dBm
wanted signal
Max RF gain - 32dB (B7:B6 = 11), AGC set for -30dBm
wanted signal
I/Q Phase Error
I/Q Gain Imbalance
I/Q Output DC Droop
I/Q Static DC Offset
Loopback Gain (for Receiver I/Q
Calibration)
RECEIVER BASEBAND FILTERS
Corner frequency 1
Corner frequency 2
Baseband Highpass Filter Corner
Frequency
Corner frequency 3
Corner frequency 4
Corner frequency 5
600
100
30
1
0.1
kHz
1MHz baseband output; 1
σ
variation, T
A
= +25°C
1MHz baseband output; 1
σ
variation, T
A
= +25°C
After completion of default power-on on-chip DC
cancellation, 1
σ
variation
No RF input signal; B7:B1 = 0000000, after completion of
default power-on on-chip DC cancellation, 1
σ
variation
Transmitter I/Q input to receiver I/Q output; transmitter B6:B1 =
000011, receiver B5:B1 = 10011 programmed through SPI
-7.0
MIN
TYP
2.9
7.9
13.7
31.4
-35
-27
-19
-3
2.5
-10
-5
dBm
-4
+23
0.15
0.05
±1
±1.0
-2
+2.5
Degrees
dB
V/s
mV
dB
V
P-P
dBm
dB
MAX
UNITS
Out-of-Band Input IP3 (Note 2)
4
_______________________________________________________________________________________
3.3GHz to 3.9GHz
Wireless Broadband RF Transceiver
AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued)
(MAX2838 Evaluation Kit, V
CC
_ = 2.8V, T
A
= +25°C, f
LO
= 3.6GHz, f
RF
= 3.601GHz, receiver baseband I/Q outputs at 90mV
RMS
, f
REF
= 40MHz,
CS
= ENABLE = RXTX = high, SCLK = DIN = low, channel bandwidth BW = 7MHz, with power matching for the RF inputs
using the typical applications and registers set to default settings and corresponding test mode, unless otherwise noted.
Unmodulated single-tone RF input signal is used with specifications that normally apply over the entire operating conditions, unless
otherwise indicated. Rx I/Q differential output load impedance = 10kΩ || 8pF.) (Note 1)
PARAMETER
CONDITIONS
A4:A0 = 00010 serial bits D7:D4 = 0000
A4:A0 = 00010 serial bits D7:D4 = 0001
A4:A0 = 00010 serial bits D7:D4 = 0010
A4:A0 = 00010 serial bits D7:D4 = 0011
A4:A0 = 00010 serial bits D7:D4 = 0100
A4:A0 = 00010 serial bits D7:D4 = 0101
A4:A0 = 00010 serial bits D7:D4 = 0110
RF Channel BW Supported by
Baseband Filter
A4:A0 = 00010 serial bits D7:D4 = 0111
A4:A0 = 00010 serial bits D7:D4 = 1000
A4:A0 = 00010 serial bits D7:D4 = 1001
A4:A0 = 00010 serial bits D7:D4 = 1010
A4:A0 = 00010 serial bits D7:D4 = 1011
A4:A0 = 00010 serial bits D7:D4 = 1100
A4:A0 = 00010 serial bits D7:D4 = 1101
A4:A0 = 00010 serial bits D7:D4 = 1110
A4:A0 = 00010 serial bits D7:D4 = 1111
Baseband Gain Ripple
Baseband Group Delay Ripple
Baseband Filter Rejection for
7MHz RF Channel BW
RSSI
RSSI Minimum Output Voltage
RSSI Maximum Output Voltage
RSSI Slope
RSSI Output Settling Time
To within 3dB of steady
state
+32dB signal step
-32dB signal step
R
LOAD
≥
10kΩ
R
LOAD
≥
10kΩ
0.65
2.4
30
200
800
V
V
mV/dB
ns
0 to 3.2MHz for BW = 7MHz
0 to 3.2MHz for BW = 7MHz
At 4.67MHz
At > 10.5MHz
At > 14MHz
At > 29.4MHz
MIN
TYP
1.5
1.75
3.5
5.0
5.5
6.0
7.0
8.0
9.0
10.0
12.0
14.0
15.0
20.0
24.0
28.0
1
65
7
53
75
75
dB
dB
P-P
ns
P-P
MHz
MAX
UNITS
MAX2838
_______________________________________________________________________________________
5
测试/测量
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