The SL1710 is a quadrature downconverter, intended for

use with both Professional and Consumer Digital Satellite

Applications.

The device contains high linearity, low noise amplifiers,

quadrature mixers, plus an on-chip oscillator, operating

between 350MHz and 500MHz, which may be synthesised via

the differential prescaler outputs.

An AGC with 18dB gain control is provided to cope with a

wide range of input signal levels.

I and Q outputs are via low impedance single ended

amplifiers. These may be connected to a dual channel analog

VP213, via a suitable anti-alias filter.

FEATURES

s Wide input frequency range (350-500MHz)

s On chip oscillator with varactor tuning or SAW

resonator operation capability

s Nominal 40dB conversion gain from IF input to I

and Q outputs

s AGC amplifier with 18dB gain control range

s I to Q phase match 90

°C to ± 2°, gain match

better than 1dB

s Low impedance I and Q single ended outputs,

with 15MHz

± 1dB BW

s Divide by 32 prescaler outputs

s Suitable for QPSK and up to 64QAM systems

APPLICATIONS

s Consumer digital satellite decoders

s Professional digital satellite decoders

s Communication systems

ORDERING INFORMATION

SL1710/KG/MPAS

SL1710/KG/MPAD (Tape and Reel)

Fig. 1 Pin allocation top view

MP16

1

16

VCCC

AGC

IOUT

VEEA

IFINB

IFIN

VCCA

QOUT

VEEC

VCCB

VCODIS

VCO

B

VCO

A

VEEB

PSCAL

PSCALB

ABSOLUTE MAXIMUM RATINGS

Storage temperature

-55

°C to +150°C

Junction temperature

-29

°C to +150°C

Supply voltage

-0.3 to 7.0V

Voltage at any other pin

-0.3 to +7.0V

Fig.2. SL1710 block diagram

AGC

IFIN

VCODIS

VCOA

AGC

AGC

÷32

LO

0 deg

90 deg

Quadrature

generator

PSCALB

PSCAL

Q OUT

I OUT

IFINB

VCOB

SL1710

Quadrature Downconverter

Preliminary Information

Supersedes October 1996 version in Media IC Handbook HB4599-1.0

DS3842 - 4.1 March 1997