MAX2831 Datasheet PDF - Maxim Integrated Products


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MAX2831
Maxim Integrated Products

Part Number MAX2831
Description 2.4GHz to 2.5GHz 802.11g/b RF Transceivers
Page 30 Pages

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19-0363; Rev 2; 3/11
EVAALVUAAILTAIOBNLEKIT
2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA
General Description
The MAX2831/MAX2832 direct conversion, zero-IF, RF
transceivers are designed specifically for 2.4GHz to
2.5GHz 802.11g/b WLAN applications. The MAX2831
completely integrates all circuitry required to implement
the RF transceiver function, providing an RF power
amplifier (PA), RF-to-baseband receive path, baseband-
to-RF transmit path, VCO, frequency synthesizer, crystal
oscillator, and baseband/control interface. The MAX2832
integrates the same functional blocks except for the PA.
Both devices include a fast-settling sigma-delta RF syn-
thesizer with smaller than 20Hz frequency steps and a
digitally tuned crystal oscillator allowing use of a low-cost
crystal. The devices also integrate on-chip DC-offset
cancellation and I/Q errors and carrier leakage-detection
circuits. Only an RF bandpass filter (BPF), crystal, RF
switch, and a small number of passive components are
needed to form a complete 802.11g/b WLAN RF front-
end solution.
The MAX2831/MAX2832 completely eliminate the need
for an external SAW filter by implementing on-chip mono-
lithic filters for both the receiver and transmitter. The
baseband filters are optimized to meet the IEEE 802.11g
standard and proprietary turbo modes up to 40MHz
channel bandwidth. These devices are suitable for the full
range of 802.11g OFDM data rates (6Mbps to 54Mbps)
and 802.11b QPSK and CCK data rates (1Mbps to
11Mbps). The ICs are available in a small, 48-pin TQFN
package measuring only 7mm x 7mm x 0.8mm.
Applications
Wi-Fi, PDA, VOIP, and Cellular Handsets
Wireless Speakers and Headphones
General 2.4GHz ISM Radios
Features
2.4GHz to 2.5GHz ISM Band Operation
IEEE 802.11g/b Compatible (54Mbps OFDM and
11Mbps CCK)
Complete RF Transceiver, PA, and Crystal
Oscillator (MAX2831)
Best-in-Class Transceiver Performance
62mA Receiver Current
2.6dB Rx Noise Figure
-76dBm Rx Sensitivity (54Mbps OFDM)
No I/Q Calibration Required
0.1dB/0.35° Rx I/Q Gain/Phase Imbalance
33dB RF and 62dB Baseband Gain Control
Range
60dB Range Analog RSSI per RF Gain Setting
Fast Rx I/Q DC-Offset Settling
Programmable Baseband Lowpass Filter
20-Bit Sigma-Delta Fractional-N PLL with
< 20Hz Step Size
Digitally Tuned Crystal Oscillator
+18.5dBm Transmit Power (5.6% EVM with
54Mbps OFDM)
31dB Tx Gain Control Range
Integrated Power Detector (MAX2831)
Serial or Parallel Gain-Control Interface
> 40dB Tx Sideband Suppression without
Calibration
Tx/Rx I/Q Error Detection
Transceiver Operates from +2.7V to +3.6V
PA Operates from +2.7V to +4.2V (MAX2831)
Low-Power Shutdown Mode
Small 48-Pin TQFN Package
(7mm x 7mm x 0.8mm)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX2831ETM+T
-40°C to +85°C 48 TQFN-EP*
MAX2832ETM+T
-40°C to +85°C 48 TQFN-EP*
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.



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2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA
ABSOLUTE MAXIMUM RATINGS
VCCTXPA, VCCPA and TXRF_ to GND ....................-0.3V to +4.5V
VCCLNA, VCCTXMX, VCCPLL, VCCCP, VCCXTAL, VCCVCO,
VCCRXVGA, VCCRXFL, and VCCRXMX_ to GND....-0.3V to +3.9V
B6, B7, B3, B2, SHDN, B5, CS, SCLK, DIN, B1, TUNE, B4,
TXBBI_, TXBBQ_, RXHP, RXTX, RXBBI_, RXBBQ_, RSSI,
BYPASS, CPOUT, LD, CLOCKOUT, XTAL, CTUNE, RXRF_ to
GND .......................................-0.3V to (Operating VCC + 0.3V)
RXBBI_, RXBBQ_, RSSI, BYPASS, CPOUT, LD, CLOCKOUT
Short-Circuit Duration ..........................................................10s
RF Input Power ...............................................................+10dBm
Continuous Power Dissipation (TA = +70°C)
48-Pin TQFN (derates 27.8mW/°C above +70°C) ..........2.22W
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
Soldering Temperature (reflow) .......................................+260°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
(MAX2831 EV kit: VCC_ = 2.7V to 3.6V, VCCPA = VCCTXPA = 2.7V to 4.2V, TA = -40°C to +85°C, Rx set to the maximum gain. CS =
high, RXHP = SCLK = DIN = low, RSSI and clock output buffer are off, no signal at RF inputs, all RF inputs and outputs terminated
into 50, receiver baseband outputs are open. 100mVRMS differential I and Q signals (54Mbps IEEE 802.11g OFDM) applied to I/Q
baseband inputs of transmitter in transmit mode, fREF = 40MHz, and registers set to recommended settings and corresponding test
mode, unless otherwise noted. Typical values are at VCC = 2.8V, VCCPA = 3.3V, and TA = +25°C, LO frequency = 2.437GHz, unless
otherwise noted. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB, balun,
and SMA connectors.) (Note 1)
PARAMETERS
Supply Voltage
VCC_
VCCPA, VCCTXPA
CONDITIONS
Shutdown mode,
B7: B1 = 0000000,
reference oscillator not
applied
TA = +25°C
MIN TYP MAX UNITS
2.7 3.6
V
2.7 4.2
20 µA
Supply Current
Standby mode
Rx mode
Tx mode, TA = +25°C,
VCC = 2.8V, VCCPA =
3.3V, (Note 2)
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
MAX2831, transmit section
MAX2831, PA, POUT = +18.2dBm
MAX2832
28 35
35
62 78
82
82 104
209 258
86
Rx calibration mode
Tx calibration mode
TA = +25°C
TA = +25°C
101
78
Rx I/Q Output Common-Mode
Voltage
TA = +25°C at default common-mode setting
0.98 1.2 1.33
Rx I/Q Output Common-Mode
Voltage Variation
TA = -40°C (relative to TA = +25°C)
TA = +85°C (relative to TA = +25°C)
-17
15
Tx Baseband Input Common-
DC-coupled
Mode Voltage Operating Range
0.9 1.3
Tx Baseband Input Bias Current Source current
22
mA
V
mV
V
µA
2 _______________________________________________________________________________________



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2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA
DC ELECTRICAL CHARACTERISTICS (continued)
(MAX2831 EV kit: VCC_ = 2.7V to 3.6V, VCCPA = VCCTXPA = 2.7V to 4.2V, TA = -40°C to +85°C, Rx set to the maximum gain. CS =
high, RXHP = SCLK = DIN = low, RSSI and clock output buffer are off, no signal at RF inputs, all RF inputs and outputs terminated
into 50, receiver baseband outputs are open. 100mVRMS differential I and Q signals (54Mbps IEEE 802.11g OFDM) applied to I/Q
baseband inputs of transmitter in transmit mode, fREF = 40MHz, and registers set to recommended settings and corresponding test
mode, unless otherwise noted. Typical values are at VCC = 2.8V, VCCPA = 3.3V, and TA = +25°C, LO frequency = 2.437GHz, unless
otherwise noted. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB, balun,
and SMA connectors.) (Note 1)
PARAMETERS
CONDITIONS
LOGIC INPUTS: SHDN, RXTX, SCLK, DIN, CS, B7:B1, RXHP
MIN TYP MAX UNITS
Digital Input-Voltage High, VIH
VCC -
0.4
V
Digital Input-Voltage Low, VIL
Digital Input-Current High, IIH
Digital Input-Current Low, IIL
LOGIC OUTPUTS: LD, CLOCKOUT
0.4 V
-1 +1 µA
-1 +1 µA
Digital Output-Voltage High, VOH Sourcing 100µA
VCC -
0.4
V
Digital Output-Voltage Low, VOL Sinking 100µA
0.4 V
AC ELECTRICAL CHARACTERISTICS—Rx Mode
(MAX2831 EV kit: VCC_ = 2.8V, VCCPA = VCCTXPA = 3.3V, TA =+25°C, fRF = 2.439GHz, fLO = 2.437GHz; receiver baseband I/Q out-
puts at 112 mVRMS (-19dBV), fREF = 40MHz, SHDN = CS = high, RXTX = 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.
Unmodulated single-tone RF input signal is used with specifications which normally apply over the entire operating conditions, unless
otherwise indicated. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB,
balun, and SMA connectors.) (Note 1)
PARAMETER
CONDITIONS
RECEIVER SECTION: LNA RF INPUT-TO-BASEBAND I/Q OUTPUTS
RF Input Frequency Range
High RF gain
RF Input Return Loss
Mid RF gain
Low RF gain
Total Voltage Gain
Maximum gain, B7:B1 =
1111111
Minimum gain, B7:B1 =
0000000
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
MIN TYP MAX UNITS
2.4 2.5 GHz
18
11 dB
14
86 98
83
dB
38
RF Gain Steps (Note 3)
From high-gain mode (B7:B6 = 11) to medium-gain
mode (B7:B6 = 10)
From high-gain mode (B7:B6 = 11) to low-gain mode
(B7:B6 = 0X)
-16
dB
-33
RF Gain-Change Settling Time
Gain change from high gain to medium gain, high gain to
low, or medium gain to low gain; gain settling to within
±2dB of steady state; RXHP = 1
0.2
µs
_______________________________________________________________________________________ 3



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2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA
AC ELECTRICAL CHARACTERISTICS—Rx Mode (continued)
(MAX2831 EV kit: VCC_ = 2.8V, VCCPA = VCCTXPA = 3.3V, TA =+25°C, fRF = 2.439GHz, fLO = 2.437GHz; receiver baseband I/Q out-
puts at 112 mVRMS (-19dBV), fREF = 40MHz, SHDN = CS = high, RXTX = 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.
Unmodulated single-tone RF input signal is used with specifications which normally apply over the entire operating conditions, unless
otherwise indicated. RF inputs/outputs specifications are referenced to device pins and do not include 1dB loss from EV kit PCB,
balun, and SMA connectors.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Baseband Gain Range
DSB Noise Figure
In-Band Compression Point
Based on EVM
In-Band Output P-1dB
Out-of-Band Input IP3 (Note 4)
I/Q Phase Error
I/Q Gain Imbalance
RX I/Q Output Load Impedance
(R || C)
Tx-to-Rx Conversion Gain for Rx
I/Q Calibration
From maximum baseband gain (B5:B1 = 11111) to
minimum baseband gain (B5:B1 = 00000)
Voltage gain = maximum with B7:B6 = 11
Voltage gain = 50dB with B7:B6 = 11
Voltage gain = 45dB with B7:B6 = 10
Voltage gain = 15dB with B7:B6 = 0X
-19dBVRMS baseband
output EVM degrades to
9%
B7:B6 = 11
B7:B6 = 10
B7:B6 = 0X
Voltage gain = 90dB, with B7:B6 = 11
B7:B6 = 11
B7:B6 = 10
B7:B6 = 0X
1σ variation (without calibration)
1σ variation (without calibration)
Minimum differential resistance
Maximum differential capacitance
For receiver gain, B7:B1 = 1101111 (Note 5)
55 62 67 dB
2.6
3.2
16
34
-41
-24
-6
2.5
-12
-4
24
±0.35
±0.1
10
10
dB
dBm
VP-P
dBm
Degrees
dB
k
pF
0.5 dB
Baseband VGA Settling Time
Gain change from B5:B1 = 10111 to B5:B1 = 00111; gain
settling to within ±2dB of steady state
0.1
µs
I/Q Output DC Step when RXHP
Transitions from 1 to 0 in
Presence of 802.11g Short
Sequence
After switching RXHP to logic 0 from initial logic 1, during
ideal short sequence data at -55dBm input in AWGN
channel, for -19dBV output; normalized to RMS signal on
I and Q outputs; transition point varied from 0 to 0.8µs in
steps of 0.1µs
-5
dBc
I/Q Output DC Droop
After switching RXHP to 0, D13:D12, Register 7
(A3:A0 = 0111)
I/Q Static DC Offset
RXHP = 1, B7:B1 = 1101110, 1σ variation
Spurious Signal Emissions from
LNA input
RF = 1GHz to 26.5GHz
RECEIVER BASEBAND FILTERS
Gain Ripple in Passband
10kHz to 8.5MHz at baseband
Group-Delay Ripple in Passband 10kHz to 8.5MHz at baseband
±1
±1
-51
±1.3
±45
V/s
mV
dBm
DBP-P
nsP-P
4 _______________________________________________________________________________________




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