L64733C LSI Logic Corporation, L64733C Datasheet - Page 11

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

Prescaler Signals
Control Signals
QOUTp, QOUTn
The following signals are the prescaler outputs from the L64733C to the
L64734.
PSOUTp PSOUTn
The following signals, some of which are generated by the L64734 IC,
control the mode of operation of the L64733C IC.
AGC1
AGC2
CPG[2:1]
L64733C/L64734 Tuner and Satellite Receiver Chipset
Q Channel Baseband Data
The QOUT differential signals form the quadrature-phase
data provided to the L64734.
Prescaler
When the LOBUF signal is LOW, the PSOUT differential
signals are the L64733C prescaler outputs.
When LOBUF is HIGH, the Local Oscillator (LO) buffer
(50
The programmable counters on the L64734 are clocked
on the rising edge of the PSOUT signal.
Automatic Gain Control 1
The AGC1 signal is a high-impedance input from the
L64734 that controls RF AGC circuitry. The AGC1 voltage
has a range of 0.5 V to 4.8 V.
Automatic Gain Control 2
The AGC2 signal is a high-impedance input from the
L64734 that controls RF AGC circuitry.
Charge Pump Gain
The CPG[2:1] signals set the charge pump gain
according to the table below.
CPG1
0
0
1
1
) feeds the PSOUT differential signals.
CPG2
0
1
0
1
Charge Pump Current (typ), mA
FB HIGH
0.1
0.3
0.6
1.8
FB LOW
0.1
0.3
0.6
1.8
Output
Output
Input
Input
Input
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