Complete Direct-Conversion L-Band Tuner
Table 11. Control Register (Address: 0x09)
BIT NAME
BIT LOCATION (0 = LSB)
DEFAULT
FUNCTION
Software standby control.
0 = Normal operation.
STBY
7
0
1 = Disables the signal path and frequency synthesizer leaving only the
2-wire bus, crystal oscillator, XTALOUT buffer, and XTALOUT buffer divider
active.
X
PWDN
X
6
5
4
X
0
X
Don ’t care.
Factory use only.
0 = Normal operation; other value is not tested.
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 (Address: 0x0A)
BIT NAME
X
BIT LOCATION (0 = LSB)
7
DEFAULT
X
Don ’t care.
FUNCTION
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.
13
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