L64733 datasheet(17/48 Pages) LSI

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L64733/L64734 Tuner and Satellite Receiver Chipset

Analog-to-Digital Converter (ADC) Interface

The ADC module converts the incoming IVIN and QVIN signals into an

internal 6-bit digital representation for processing. The following pins

support the ADC module.

ADCVDDI/Q

ADC Power

Input

These are the analog power supply pins for the ADC

module; they are normally connected to the system

power (VDD) plane.

ADCVSSI/Q

ADC Analog Ground

Input

These are the analog ground pins for the ADC module;

they are normally connected to the system ground plane.

VREFP

Reference Voltage, Positive

Input/Output

ADC reference voltage generated by the on-chip

bandgap-based generator. Bypass to GND using a

0.1

µF capacitor.

VREFN

Reference Voltage, Negative

Input/Output

ADC reference voltage generated by the on-chip

bandgap-based generator. Bypass to GND using a

0.1

µF capacitor.

VMID

Reference Voltage, Middle

Input/Output

ADC reference voltage generated by the on-chip

bandgap-based generator. Bypass to GND using a

0.1

µF capacitor.

AGC Control Interface

The AGC Control interface contains signals used for power control.

AGC1, AGC2 Power Control Signals

Output

The AGC1 and AGC2 signals are the positive

Σ∆

modulated output used for power control. These signals

can each drive an external passive RC ﬁlter that feeds a

gain control stage for dual-stage AGC. For a single-stage

AGC, AGC1 can be used.

L64733 Datasheet(PDF) 17 Page - LSI Computer Systems

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