W-CDMA/W-TDD/TD-SCDMA Zero-IF Receivers
Table 3. Operation Control Register (OPCNTRL, Address 1011)
BIT
(B0 = LSB)
B11, B10, B9, B8
POWER-UP
STATE
0000
BIT NAME
(RESERVED)
Set to zero for normal operation.
FUNCTION
Sets the -3dB corner of the highpass filter used for DC offset removal at
baseband (only possible when the automatic DC-offset-cancellation bit
(CONFIG.B5) is disabled):
B7, B6
00
RC1, RC0
0 0 = 8.6kHz highpass corner
0 1 = 17.2kHz highpass corner
1 0 = 100kHz highpass corner
1 1 = 1MHz highpass corner
B5
1
SHDN
Zero shuts down everything except serial interface and registers, retaining
their values.
For MAX2390–MAX2393/MAX2401:
IDLE
Zero shuts down everything except RF PLL, RF VCO, serial interface, and
B4
1
(RESERVED)
registers, retaining their values.
For MAX2396/MAX2400:
Set to 1 for normal operation.
Sets LNA operating mode according to the following:
B3
1
GLNA
1 = high gain
0 = low gain
Sets mixer linearity in high-gain mode:
B2
0
LMXR
0 = medium linearity
1 = high linearity
Sets MIXER operating mode according to the following:
B1
1
GMXR
1 = high gain
0 = low gain
Sets output common-mode voltage for baseband I/Q outputs:
B0
1
VCM
0 = 1.2V
1 = 1.42V
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