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MAX2830
2.4GHz to 2.5GHz 802.11g/b RF Transceiver, PA,
and Rx/Tx/Antenna Diversity Switch
Pin Description (continued)
PIN
35
36
37
38
39
40
41
42
43
44
45
46
47
48
—
NAME
RXBBQ-
RXBBQ+
RXBBI-
RXBBI+
V CCRXVGA
RXHP
V CCRXFL
TXBBQ-
TXBBQ+
TXBBI-
TXBBI+
V CCRXMX
ANTSEL
RXTX
EP
FUNCTION
Receiver Baseband Q-Channel Differential Outputs. In TX calibration mode, these pins are the LO leakage
and sideband detector outputs.
Receiver Baseband I-Channel Differential Outputs. In TX calibration mode, these pins are the LO leakage
and sideband detector outputs.
Receiver VGA Supply Voltage
Receiver Baseband AC-Coupling High-Pass Corner Frequency Control Logic Input
Receiver Baseband Filter Supply Voltage
Transmitter Baseband I-Channel Differential Inputs
Transmitter Baseband Q-Channel Differential Inputs
Receiver Downconverters Supply Voltage
Antenna Selection Logic Input. See Table 1 for operation
Rx/Tx Mode Control Logic Input. See Table 32 for operating modes.
Exposed Paddle. Connect to the ground plane with multiple vias for proper operation and heat dissipation.
Do not share with any other pin grounds and bypass capacitors' ground.
Detailed Description
The MAX2830 single-chip, low-power, direct conversion,
zero-IF transceiver is designed to support 802.11g/b
MAX2830
applications operating in the 2.4GHz to 2.5GHz band.
The fully integrated transceivers include a receive path,
transmit path, VCO, sigma-delta fractional-N synthesizer,
crystal oscillator, RSSI, PA power detector, temperature
sensor, Rx and Tx I/Q error-detection circuitry, baseband-
control interface, linear power amplifier, and an Rx/Tx
antenna diversity switch. The only additional components
required to implement a complete radio front-end solution
are a crystal, a pair of baluns, a BPF, and a small number
of passive components (RCs, no inductors required).
Rx/Tx and Antenna Diversity Switches
The MAX2830 integrates an Rx/Tx switch and an anten-
na diversity switch before the receiver and after the
2
ANT1
2
ANT2
2
2
2
LNA
PA
power amplifier. See Figure 1 for a block diagram of the
switches. The receiver and transmitter enable pin
(RXTX) and the antenna selection pin (ANTSEL) deter-
mine which ports (ANT1 or ANT2) the receiver or trans-
mitter is connected to. See Table 1 for the Rx/Tx and
antenna diversity switches truth table. When RXTX = 0
Figure 1. Simplified Rx/Tx and Antenna Diversity Switch Structure
(receive mode) and ANTSEL = 0, the switch provides a
low-insertion loss path (main) between the ANT1 port
(pins 4 and 5) and the receiver. When RXTX = 0
(receive mode) and ANTSEL = 1, the switch provides
Table 1. Rx/Tx and Antenna Diversity Switches Operation
20
RXTX
0
0
1
ANTSEL
0
1
X
MODE
Rx (main)
Rx (diversity)
Tx
ANTENNA
Ant1_
Ant2_
Ant2_
Maxim Integrated
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