PS20060

Data Sheet

Figure 3 - Detailed Block Diagram

1.0 Functional Description

The PS20060 is a three-band RF mixer oscillator with on-board frequency synthesizer and IF AGC amplifier,

integrating all tuner active circuitry after the tracking filter into a single package.

It is intended for use in all band terrestrial tuners, and requires a minimum external component count. It contains all

elements required for RF down conversion to a standard IF with the exception of external VCO tank circuits.

In normal applications the RF input is interfaced to the selected mixer oscillator preamplifier through the tuner pre-

filter and AGC stages. The PS20060 provides an RF AGC control signal, which can be used to control the RF gain.

The preamplifier output feeds the mixer stage where the required channel is down converted to the IF frequency.

The local oscillator frequency for the down conversion is obtained from the on board PLL and local oscillator, with

an external varactor tuned tank.

The downconverted signal is then passed through an external filter into a SAW filter driver amplifier. This provides

two output channels for hybrid analog and digital applications.

Data Sheet 291359 issue 1

Plessey Semiconductors Ltd.

Design & Technology Centre, Delta 500, Delta Business Park, Great Western Way, Swindon, UK SN5 7XE

Tel: +44 1793 518000

Fax: +44 1793 518030

Web: www.plesseysemi.com

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