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2.4GHz 802.11b Zero-IF Transceivers
Pin Description (continued)
PIN
39
40
41
42
43
44
45
46
47
48
Exposed
Paddle
NAME
RX_BBQP
RX_BBQN
RX_BBIN
RX_BBIP
RX_DET
N.C.
VCC_BUF
RX_ON
VCC_RMX
TX_ON
RX_AGC
GND
DESCRIPTION
Receive Positive Quadrature Baseband Output. Analog low-impedance differential buffer output.
Connect output directly to baseband ADC input. Internally biased to 1.2V common-mode voltage and
can drive loads up to 5k ? || 5pF.
Receive Negative Quadrature Baseband Output. Analog low-impedance differential buffer output.
Connect output directly to baseband ADC input. Internally biased to 1.2V common-mode voltage and
can drive loads up to 5k ? || 5pF.
Receive Negative In-Phase Baseband Output. Analog low-impedance differential buffer output.
Connect output directly to baseband ADC input. Internally biased to 1.2V common-mode voltage and
can drive loads up to 5k ? || 5pF.
Receive Positive In-Phase Baseband Output. Analog low-impedance differential buffer output.
Connect output directly to baseband ADC input. Internally biased to 1.2V and can drive loads up to
5k ? || 5pF.
Receive Level Detection Output. Digital CMOS output. Connect output directly to baseband IC input.
Used to indicate RF input level. Logic high for input levels above -49dBm (typ). Logic low for levels
below -54dBm (typ). (MAX2820 and MAX2821)
No Connection (MAX2820A/MAX2821A)
Supply Voltage for Receiver Baseband Buffer. Bypass with a capacitor as close to the pin as
possible. Do not share the bypass capacitor ground vias with other branches.
Receiver-On Control Input. Digital CMOS input. Connect to baseband IC mode control CMOS output.
Supply Voltage for Receiver Downconverter. Bypass with a capacitor as close to the pin as possible.
Do not share the bypass capacitor ground vias with other branches.
Transmitter-On Control Input. Digital CMOS input. Connect directly to baseband IC mode control
CMOS output.
Receive AGC Control. Analog high-impedance input. Connect directly to baseband IC DAC voltage
output. See the Typical Operating Characteristics for Gain vs. V RX_AGC .
DC and AC Ground Return for IC. Connect to PC board ground plane using multiple vias.
Changes in “A” Version
The MAX2820A/MAX2821A are cost-reduced versions
of the original MAX2820/MAX2821, intended as a drop-
in replacement — no changes to PC board layout, BOM,
or control software are required. Functionally, the “ A ”
version removes unused functions and programmability
while maintaining virtually identical performance char-
acteristics. The changes are detailed below.
Synthesizer
The original device has the ability to program the
charge-pump source/sink current (±1mA or ±2mA); the
“ A ” version sets the charge-pump current at ±2mA, and
bit SYNTH:D6 (ICP) should now always be pro-
grammed to be 1.
Receive Filter
The original device has the ability to control the base-
band LPF corner; the “ A ” version sets the LPF corner at
8.0MHz. Register bits RECEIVE:D2 – D0 are now “ don ’ t
cares. ”
Receive-Level Detector (RSSI)
The original device has a receive-level detect output (pin
43, “ RX_DET ” ); the “ A ” version removes this functionality.
Pin 43 is a no-connect (N.C.) on the “ A ” version.
14
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