L64733C LSI Logic Corporation, L64733C Datasheet - Page 18

• Manufacturer Part Number: L64733C
• Description: Tuner And Satellite Receiver Chipset Data Sheet 2/01
• Manufacturer: LSI Logic Corporation

AGC Control Interface
Channel Data Output Interface
18
ADCVDDI/Q
ADCVSSI/Q
FBUFVDD
FBUFVSS
IBIAS
The AGC Control Interface contains signals used for power control.
AGC1, AGC2 Power Control
The Channel Data Output Interface is the output path from the L64734.
It typically is connected to the input of the transport demultiplexer in a
set-top decoder application.
L64733C/L64734 Tuner and Satellite Receiver Chipset
ADC Power
ADCVDDI/Q are the analog power supply pins for the
ADC module and normally are connected to the system
power (V
ADC Analog Ground
ADCVSSI/Q are the analog ground pins for the ADC
module and normally are connected to the system
ground plane.
Analog Supply
FBUFVDD is the analog supply pin for the on-chip
reference voltage generator. This pin normally is
connected to the system power (V
Analog Ground
FBUFVSS is the analog ground pin for the on-chip
reference voltage generator. This pin normally is
connected to the system ground (V
ADC Bias Current
This is the bias current for the ADC module. Connect this
output to a 39 k
the resistor to ground.
The AGC1 and AGC2 signals are the positive
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, and has the same functionality
as the PWRP pin on the L64724.
DD
) plane.
resistor, and connect the other side of
DD
SS
) plane.
) plane.
Output
Output
Input
Input
Input
Input