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MAX2830
2.4GHz to 2.5GHz 802.11g/b RF Transceiver, PA,
and Rx/Tx/Antenna Diversity Switch
Transmitter
The transmitter integrates baseband lowpass filters,
direct-upconversion mixers, a VGA, a PA driver, and a lin-
ear RF PA with a power detector. A logic-high on the
RXTX input (pin 48) and a logic-high on the SHDN input
(pin 12) enable the transmitter. The PA outputs are routed
to ANT2, regardless of the state at ANTSEL.
Transmitter I/Q Baseband Inputs
The differential analog inputs of the transmitter baseband
amplifier I/Q inputs (TXBBI+, TXBBI-, TXBBQ+, TXBBQ-)
have a differential impedance of 20k ? || 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
Table 9. Transmitter LPF Coarse -3dB
Corner Frequency Settings in Register
(A3:A0 = 1000)
Register 8 (A3:A0 = 1000) and bit D5:D3 in Register 7
(A3:A0 = 0111). The -3dB corner frequency is tightly
controlled on-chip and does not require user adjust-
ment. Additionally, provisions are made to fine tune the
-3dB corner frequency through bits D5:D3 in the Filter
Programming register (A3:A0 = 0111). See Tables 9
and 10.
Transmitter Variable-Gain Amplifier
The variable-gain amplifier of the transmitter provides
31dB of gain control range programmable in 0.5dB
steps over the top 8dB of the gain control range and in
1dB steps below that. The transmitter gain can be pro-
grammed serially through the SPI interface by setting
bits D5:D0 in Register 12 (A3:A0 = 1100) or in parallel
through the digital logic gain-control pins B6:B1 (pins
3, 6, 8, 11, 14, 23, and 34, respectively). Set bit D10 =
0 in Register 9 (A3:A0 = 1001) to enable parallel pro-
gramming, and set bit D10 = 1 to enable programming
through the 3-wire serial interface. See Table 11 for the
transmitter VGA gain-control settings.
Table 11. Transmitter VGA Gain-Control
Settings
BITS (D1:D0)
00
01
10
11
-3dB CORNER
FREQUENCY (MHz)
8
11
16.5
22.5
MODE
11b
11g
Turbo 1
Turbo 2
NO.
63
62
61
:
D5:D0 OR
B6:B1
111111
111110
111101
:
OUTPUT SIGNAL POWER
Max
Max - 0.5dB
Max - 1.0dB
:
Table 10. Transmitter LPF Fine -3dB
Corner Frequency Adjustment in
Register (A3:A0 = 0111)
49
48
47
46
110001
110000
101111
101110
Max - 7dB
Max - 7.5dB
Max - 8dB
Max - 8dB
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
45
44
:
5
4
3
2
1
0
101101
101100
:
000101
000100
000011
000010
000001
000000
Max - 9dB
Max - 9dB
:
Max - 29dB
Max - 29dB
Max - 30dB
Max - 30dB
Max - 31dB
Max - 31dB
Maxim Integrated
23
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