L64734 datasheet(11/48 Pages) LSI

11 / 48 page

L64733/L64734 Tuner and Satellite Receiver Chipset

INSEL

RF Port Input Select

Input

When the INSEL signal is asserted, the L64733 is in

normal mode. When the INSEL signal is deasserted, the

L64733 is in Loop-Through mode. In this mode, the RFIN

signal is looped through to the RFOUT signal, and the

L64733 local oscillator is shut off.

MODn, MODp Prescaler Modulus

Input

The MOD differential signals form a PECL input that sets

the prescaler modulus. When the MODp signal is positive

with respect to the MODn signal, the prescaler modulus

is set to 32 (divide by 32). When the MODn signal is

positive with respect to the MODp signal, the prescaler

modulus is set to 33 (divide by 33).

PLLINn, PLLINp

Phase Detector

Input

The PLLIN differential signals form the phase detector

input and are connected to the L64734 PLLINp and

PLLINn output signals. See the L64734 PLLINp and

PLLINn descriptions in the subsection entitled

“Synthesizer Control Interface” on page 19.

QDCn, QDCp Q-Channel DC Offset Correction

Input

Connect a 0.1

µF (or larger) capacitor between the QDCp

and QDCn signals.

Channel Data Signals

This section describes the channel data signals from the L64733 to the

L64734.

IOUTn, IOUTp I-Channel Baseband Data

Output

The IOUT differential signals form the in-phase data

provided to the L64734.

QOUTn, QOUTp

Q-Channel Baseband Data

Output

The QOUT differential signals form the quadrature-phase

data provided to the L64734.

L64734 Datasheet(PDF) 11 Page - LSI Computer Systems

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