MAX2112ETI(2007) 查看數據表（PDF） - Maxim Integrated

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MAX2112ETI
(Rev.:2007)

Complete, Direct-Conversion Tuner for DVB-S2 Applications

Maxim Integrated 

Complete, Direct-Conversion

Tuner for DVB-S2 Applications

Table 8. PLL Register

BIT NAME BIT LOCATION (0 = LSB) DEFAULT

FUNCTION

D24

7

VCO divider setting.

1

0 = Divide by 2.

1 = Divide by 4 (default).

CPS

6

Charge-pump current mode. Users must program to 0 upon powering up the

0

device.

0 = Charge-pump current controlled by ICP bit.

1 = Charge-pump current controlled by VCO autoselect (VAS).

ICP

5

Charge-pump current. Users must program to 1 upon powering up the

0

device.

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.

VAS

2

VCO autoselection (VAS) circuit.

1

0 = Disable VCO selection must be programmed through I2C.

1 = Enable VCO selection controlled by autoselection circuit.

ADL

1

Enables or disables the VCO tuning voltage ADC latch when the VCO

0

autoselect mode (VAS) is disabled.

0 = Disables the ADC latch.

1 = Latches the ADC value.

ADE

0

Enables or disables VCO tuning voltage ADC read when the VCO autoselect

mode (VAS) is disabled.

0

0 = Disables ADC read.

1 = Enables ADC read.

Table 10. Lowpass Filter Register

BIT NAME BIT LOCATION (0 = LSB) DEFAULT

FUNCTION

LPF[7:0]

Sets the baseband lowpass filter 3dB corner frequency.

7–0

01001011 f-3dB = 4MHz + (LPF[3:0]dec - 12) x 290kHz.

Default value equates to f-3dB = 22.27MHz typical.

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