Datasheet

MAX2831/MAX2832
2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS—Rx Mode (continued)
(MAX2831 EV kit: V
CC_
= 2.8V, V
CCPA
= V
CCTXPA
= 3.3V, T
A
=+25°C, f
RF
= 2.439GHz, f
LO
= 2.437GHz; receiver baseband I/Q out-
puts at 112 mV
RMS
(-19dBV), f
REF
= 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
From maximum baseband gain (B5:B1 = 11111) to
minimum baseband gain (B5:B1 = 00000)
55 62 67 dB
Voltage gain = maximum with B7:B6 = 11 2.6
Voltage gain = 50dB with B7:B6 = 11 3.2
Voltage gain = 45dB with B7:B6 = 10 16
DSB Noise Figure
Voltage gain = 15dB with B7:B6 = 0X 34
dB
B7:B6 = 11 -41
B7:B6 = 10 -24
In-Band Compression Point
Based on EVM
-19dBV
RMS
baseband
output EVM degrades to
9%
B7:B6 = 0X -6
dBm
In-Band Output P-1dB Voltage gain = 90dB, with B7:B6 = 11 2.5 V
P-P
B7:B6 = 11 -12
B7:B6 = 10 -4
Out-of-Band Input IP3 (Note 4)
B7:B6 = 0X 24
dBm
I/Q Phase Error 1σ variation (without calibration) ±0.35 D eg r ees
I/Q Gain Imbalance 1σ variation (without calibration) ±0.1 dB
Minimum differential resistance 10 kΩ
RX I/Q Output Load Impedance
(R || C)
Maximum differential capacitance 10 pF
Tx-to-Rx Conversion Gain for Rx
I/Q Calibration
For receiver gain, B7:B1 = 1101111 (Note 5) 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)
±1 V/s
I/Q Static DC Offset RXHP = 1, B7:B1 = 1101110, 1σ variation ±1 mV
Spurious Signal Emissions from
LNA input
RF = 1GHz to 26.5GHz -51 dBm
RECEIVER BASEBAND FILTERS
Gain Ripple in Passband 10kHz to 8.5MHz at baseband ±1.3 DB
P-P
G r oup - D el ay Ri p p l e i n P assb and 10kHz to 8.5MHz at baseband ±45 ns
P-P