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Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
Table 10. Shutdown Register
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.
RF front-end enable.
FE
0
0
0 = Normal operation
1 = Shuts down the RF front-end. Value not tested.
Table 11. Test Register
BIT NAME
BIT LOCATION (0 = LSB)
DEFAULT
FUNCTION
Charge-pump test modes.
000 = Normal operation (default)
001 = Crystal translator ECL to CMOS path
CPTST[2:0]
7, 6, 5
000
100 = Both source and sink currents enabled
101 = Source current enabled
110 = Sink current enabled
111 = High impedance (both source and sink current disabled)
X
TURBO
LDMUX[2:0]
4
3
2, 1, 0
X
0
000
Don’t care.
Charge-pump fast lock. Users must program to 1 upon powering
up the device.
REFOUT output.
000 = Normal operation; other values are not tested
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