PS20063

Figure 3 - Detailed Block Diagram

1.0

Functional Description

The

PS20063 is a three-band RF mixer oscillator with image rejection, 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

PS20063 provides an RF AGC control signal, which can be used to control the RF gain.

The preamplifier output feeds the image rejection 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.

SDB

XCAP

PORT

INTERFACE

GPP2

GPP3

I2C

INTERFACE

GPP1

GPP0

REF

DIVIDER

PROG

DIVIDER

XTAL

DRIVE

PUMP

SD

SCL

ADD

SDA

AGCOP

CNOP

CNOPB

SIP

SIPB

AGC

DET

ADC

IPREF

HIIP

MIDIP

LOIP

VccDIG

VeeRF

VccSA

QUADRATURE

GENERATOR

ADC

IFOUT

IFOUTB

IFIP

IFIPB

IFAGC

VccIF

VccIF

VeeIF

switch

SAB

SA

VeeOSC

VccOSC

CONT

HIIPB

(paddle)

Vee

Data Sheet 291305 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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