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MAX2112
Complete, Direct-Conversion
Tuner for DVB-S2 Applications
Table 11. Control Register
BIT NAME
BIT LOCATION (0 = LSB) DEFAULT
Software standby control.
FUNCTION
STBY
7
0
0 = Normal operation.
1 = Disables the signal path and frequency synthesizer leaving only the 2-wire
bus, crystal oscillator, XTALOUT buffer, and XTALOUT buffer divider active.
X
6
X
Don’t care.
Factory use only.
PWDN
5
0
0 = Normal operation;
other value is not tested.
X
4
X
Don’t care.
Baseband gain setting (1dB typical per step).
BBG[3:0]
3-0
0000
0000 = Minimum gain (0dB, default).
…
1111 = Maximum gain (15dB typical).
Table 12. Shutdown Register
BIT NAME
BIT LOCATION (0 = LSB) DEFAULT
FUNCTION
X
7
X
Don’t care.
PLL enable.
PLL
6
0
0 = Normal operation.
1 = Shuts down the PLL. Value not tested.
Divider enable.
DIV
5
0
0 = Normal operation.
1 = Shuts down the divider. Value not tested.
VCO enable.
VCO
4
0
0 = Normal operation.
1 = Shuts down the VCO. Value not tested.
Baseband enable.
BB
3
0
0 = Normal operation.
1 = Shuts down the baseband. Value not tested.
RF mixer enable.
RFMIX
2
0
0 = Normal operation.
1 = Shuts down the RF mixer. Value not tested.
RF VGA enable.
RFVGA
1
0
0 = Normal operation.
1 = Shuts down the RF VGA. Value not tested.
Front-end enable.
FE
0
0
0 = Normal operation.
1 = Shuts down the front-end. Value not tested.
12
Maxim Integrated
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