Complete Direct-Conversion L-Band Tuner
Table 8. PLL Register (Address: 0x06)
BIT NAME
BIT LOCATION (0 = LSB)
DEFAULT
FUNCTION
VCO divider setting.
D24
7
1
0 = Divide by 2. Use for LO frequencies
1125MHz.
1 = Divide by 4. Use for LO frequencies < 1125MHz.
Charge-pump current mode.
CPS
6
1
0 = Charge-pump current controlled by ICP bit.
1 = Charge-pump current controlled by VCO autoselect (VAS).
Charge-pump current.
ICP
5
0
0 = 600μA typical.
1 = 1200μA typical.
X
4 –0
X
Don ’t care.
Table 9. VCO Register (Address: 0x07)
BIT NAME
VCO[4:0]
BIT LOCATION (0 = LSB)
7 –3
DEFAULT
11001
FUNCTION
Controls which VCO is activated when using manual VCO programming mode.
This also serves as the starting point for the VCO autoselection (VAS) mode.
VCO autoselection (VAS) circuit.
VAS
2
1
0 = Disable VCO selection must be programmed through I 2 C.
1 = Enable VCO selection controlled by autoselection circuit.
Enables or disables the VCO tuning voltage ADC latch when the VCO
ADL
1
0
autoselect mode (VAS) is disabled.
0 = Disables the ADC latch.
1 = Latches the ADC value.
Enables or disables VCO tuning voltage ADC read when the VCO
ADE
0
0
autoselect mode (VAS) is disabled.
0 = Disables ADC read.
1 = Enables ADC read.
Table 10. Lowpass Filter Register (Address: 0x08)
BIT NAME
BIT LOCATION (0 = LSB)
DEFAULT
FUNCTION
Reserved
12
7 –0
01001011 User must program to 10010111 (97h) upon powering up the device.
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