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MAX2830
2.4GHz to 2.5GHz 802.11g/b RF Transceiver, PA,
and Rx/Tx/Antenna Diversity Switch
Table 30. Register 14 (A3:A0 = 1110)
BIT
D13:D11
D10
D9
D8:D7
D6:D0
RECOMMENDED
000
0
1
10
XXXXXXX
DESCRIPTION
Set to recommended value.
Reference Clock Output Divider Ratio. Set 1 to divide by 2 or set 0 to divide by 1.
Reference Clock Output Enable. Set 1 to enable the reference clock output or set 0 to disable.
Set to recommended value.
Crystal-Oscillator Fine Tune. Tunes crystal oscillator over ±20ppm to within ±1ppm.
X = Don’t care.
Table 31. Register 15 (A3:A0 = 1111)
BIT
D13:D12
D11:D10
D9:D0
RECOMMENDED
00
00
0101000101
DESCRIPTION
Set to recommended value.
Receiver I/Q Output Common-Mode Voltage Adjustment. Set D11:D10 = 00: 1.1V,
01: 1.2V, 10: 1.3V, 11: 1.45V.
Set to recommended value.
Table 32. Operating Mode Table
LOGIC PINS
REGISTER
SETTINGS
CIRCUIT BLOCK STATES
MODE
Shutdown
Standby
Rx
Tx
Rx Calibration
Tx Calibration
SHDN
0
0
1
1
1
1
RXTX
0
1
0
1
0
1
D1:D0
(A3:A0 = 0110)
00
00
X0
0X
X1
1X
Rx PATH
Off
Off
On
Off
On
(except LNA)
Off
Tx PATH
Off
Off
Off
On
Upconverters
On (except PA
driver and PA)
PLL, VCO,
LO GEN,
AUTOTUNER
Off
On
On
On
On
On
CALIBRATION
SECTIONS ON
None
None
None
None
Cal tone, RF phase
shift, Tx filter
AM detector,
Rx I/Q buffers
X = Don’t care.
Note: See Table 1 for Rx/Tx and antenna diversity operating mode.
Modes of Operation
The modes of operation for the MAX2830 are shutdown,
standby, transmit, receive, transmitter calibration, and
receiver calibration. See Table 32 for a summary of the
modes of operation. The logic-input pins, SHDN (pin 12)
and RXTX (pin 48), control the various modes.
Shutdown Mode
The MAX2830 features a low-power shutdown mode
that disables all circuit blocks, except the serial-inter-
face and internal registers, allowing the registers to be
30
loaded and values maintained, as long as V CC is
applied. Set SHDN and RXTX logic-low to place the
device in shutdown mode. After a supply voltage ramp
up, supply current in shutdown mode could be high.
Program the default value to SPI register 0 to eliminate
high shutdown current.
Standby Mode
The standby mode is used to enable the frequency syn-
thesizer block while the rest of the device is powered
down. In this mode, the PLL, VCO, and LO generators
Maxim Integrated
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