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2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA
Receiver I/Q Baseband Outputs
The differential outputs (RXBBI+, RXBBI-, RXBBQ+,
RXBBQ-) of the baseband amplifiers have a differential
output impedance of ~300 Ω , and are capable of dri-
ving differential loads up to 10k Ω || 10pF. The outputs
are internally biased to a common-mode voltage of
1.1V and are intended to be DC-coupled to the in-
phase (I) and quadrature (Q) analog-to-digital data
converter inputs of the accompanying baseband IC.
Register 8 (A3:A0 = 1000) and bit D5:D3 in Register 7
(A3:A0 = 0111). The -3dB corner-frequency is tightly con-
trolled on-chip and does not require user adjustment.
Additionally, provisions are made to fine tune the -3dB cor-
ner frequency through bits D5:D3 in the Filter
Programming register (A3:A0 = 0111). See Tables 8 and 9.
Table 7. RSSI Pin Truth Table
INPUT CONDITIONS
Additionally, the common-mode output voltage can be
adjusted from 1.1V to 1.4V through programming bits
D11:D10 in Register 15 (A3:A0 = 1111).
Received Signal-Strength Indicator (RSSI)
The RSSI output (pin 16) can be programmed to multi-
plex an analog output voltage proportional to the
received signal strength, the PA output power
(MAX2831), or the die temperature. Set bits D9:D8 = 00
in Register 8 (A3:A0 = 1000) to enable the RSSI output
in receive mode (off in transmit mode). Set bit D10 = 1
to enables the RSSI output when RXHP = 1, and dis-
able the RSSI output when RXHP = 0. Set bit D10 = 0 to
enable the RSSI output independent of RXHP. See
Table 7 for a summary of the RSSI output versus regis-
ter programming and RXHP.
A3:A0 = 1000,
D9:D8
X
00
01
10
00
01
10
A3:A0 = 1000,
D10
0
0
0
0
1
1
1
RXHP
0
1
1
1
X
X
X
RSSI OUTPUT
No signal
RSSI
Temperature
sensor
Power detector
(MAX2831)
RSSI
Temperature
sensor
Power detector
(MAX2831)
The received signal strength indicator provides an ana-
log voltage proportional to the log of the sum of the
squares of the I and Q channels, measured after the
receive baseband filters and before the variable-gain
X = Don’t care.
Table 8. Transmitter LPF Coarse -3dB
Corner Frequency Settings in Register
amplifiers. The RSSI analog output voltage is propor-
tional to the RF input signal level and LNA gain state
over a 60dB range, and is not dependent upon VGA
gain. See the graph RX RSSI Output vs. Input Power in
(A3:A0 = 1000)
-3dB CORNER
BITS (D1:D0)
FREQUENCY (MHz)
MODE
the Typical Operating Characteristics for further details.
Transmitter
The transmitter integrates baseband lowpass filters,
direct-upconversion mixers, a VGA, a PA driver, and a lin-
00
01
10
11
8
11
16.5
22.5
11b
11g
Turbo 1
Turbo 2
ear RF PA with a power detector (MAX2831). A logic-high
on the RXTX input (pin 48) and a logic-high on the SHDN
input (pin 12) enable the transmitter.
Transmitter I/Q Baseband Inputs
Table 9. Transmitter LPF Fine -3dB
Corner Frequency Adjustment in
Register (A3:A0 = 0111)
The differential analog inputs of the transmitter baseband
amplifier I/Q inputs (TXBBI+, TXBBI-, TXBBQ+, TXBBQ-)
have a differential impedance of 20k Ω || 1pF. The inputs
require an input common-mode voltage of 0.9V to 1.3V,
which is provided by the DC-coupled I and Q DAC out-
puts of the accompanying baseband IC.
Transmitter Baseband Lowpass Filtering
The transmitter integrates lowpass filters that can be
tuned to -3dB corner frequencies of 8MHz (11b),
11MHz (11g), 16.5MHz (turbo 1 mode), and 22.5MHz
(turbo 2 mode) through programming bits D1:D0 in
BITS (D5:D3)
000
001
010
011
100
101
101–111
% ADJUSTMENT RELATIVE TO
COARSE SETTING
90
95
100
105
110 (11g)
115
Not used
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