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MAX2112
Complete, Direct-Conversion
Tuner for DVB-S2 Applications
Table 8. PLL Register
BIT NAME
BIT LOCATION (0 = LSB) DEFAULT
VCO divider setting.
FUNCTION
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
BIT NAME
BIT LOCATION (0 = LSB) DEFAULT
FUNCTION
VCO[4:0]
7–3
11001
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 autoselect
ADE
0
0
mode (VAS) is disabled.
0 = Disables ADC read.
1 = Enables ADC read.
Table 10. Lowpass Filter Register
BIT NAME
BIT LOCATION (0 = LSB) DEFAULT
FUNCTION
Sets the baseband lowpass filter 3dB corner frequency.
LPF[7:0]
Maxim Integrated
7–0
01001011 f -3dB = 4MHz + (LPF[7:0] dec - 12) x 290kHz.
Default value equates to f -3dB = 22.27MHz typical.
11
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