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2.4GHz 802.11b Zero-IF Transceivers
AC ELECTRICAL CHARACTERISTICS — RECEIVE MODE (continued)
(MAX2820/MAX2821 EV kit: V CC = +2.7V to +3.6V, f RF and f LO = 2400MHz to 2499MHz, f OSC = 22MHz or 44MHz, receive baseband
outputs = 500mV P-P , SHDNB = RX_ON = V IH , TX_ON = V IL , CSB = V IH , SCLK = DIN = V IL , RF_GAIN = V IH , 0V ≤ V RX_AGC ≤ +2.0V,
RBIAS = 12k ? , I CP = +2mA, BW PLL = 45kHz, differential RF input matched to 50 ? , registers set to default power-up settings, T A =
+25 ° C, unless otherwise noted. Typical values are at V CC = +2.7V, f LO = 2437MHz, f OSC = 22MHz, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
LO Leakage
-65
dBm
Input Return Loss
With external match
15
dB
RECEIVER BASEBAND
BASEBAND FILTER RESPONSE
MAX2820/
MAX2821
Default bandwidth setting
BW (2:0) = (010)
7
-3dB Frequency
MAX2820A/
MAX2821A
At 12.5MHz
8
40
MHz
MAX2820/
MAX2821
At 16MHz
At 20MHz
65
70
Attenuation Relative to Passband
MAX2820A/
MAX2821A
At 30MHz
At 12.5MHz
At 16MHz
At 20MHz
At 30MHz
85
28
52
70
85
dB
BASEBAND OUTPUT CHARACTERISTICS
RX I/Q Gain Imbalance
RX I/Q Phase Quadrature Imbalance
RX I/Q Output 1dB Compression
RX I/Q Output THD
Differential voltage into 5k ?
V OUT = 500mV P-P at 5.5MHz, Z L = 5k ? ||5pF
-1
-5
1
-35
+1
+5
dB
Degrees
V P-P
dBc
BASEBAND AGC AMPLIFIER
AGC Range
AGC Slope
AGC Response Time
V RX_AGC = 0 to +2.0V
Peak gain slope
20dB gain step, 80dB to 60dB,
settling to ± 1dB
70
60
2
dB
dB/V
μs
BASEBAND RX PEAK LEVEL DETECTION (MAX2820/MAX2821 ONLY)
RX Detector Trip Point (at RX_RF)
CW signal
RF_GAIN = V IH ,
RX_DET = V OL to V OH
-49
dBm
RF_GAIN = V IL ,
RX_DET = V OH to V OL
-54
RX Detector Hysteresis
5
dB
RX Detector Rise Time
With 3dB overdrive
1
μs
4
_______________________________________________________________________________________
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