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SL1710

Quadrature Downconverter

Preliminary Information

Supersedes October 1996 version in Media IC Handbook HB4599-1.0

DS3842 - 4.1 March 1997

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

to digital converter such as the

PCA916,

VP216, VP215 or

VP213, via a suitable anti-alias filter.

AGC

IOUT

VEEA

IFINB

IFIN

VCCA

QOUT

VEEC

1

16

VCCB

VCODIS

VCO

B

VCO

A

VEEB

PSCAL

PSCALB

VCCC

SL1710

MP16

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擄C to

鹵

2擄, gain match

better than 1dB

s

Low impedance I and Q single ended outputs,

with 15MHz

鹵

1dB BW

s

Divide by 32 prescaler outputs

s

Suitable for QPSK and up to 64QAM systems

Fig. 1 Pin allocation top view

ORDERING INFORMATION

SL1710/KG/MPAS

SL1710/KG/MPAD (Tape and Reel)

ABSOLUTE MAXIMUM RATINGS

Storage temperature

Junction temperature

Supply voltage

Voltage at any other pin

-55擄C to +150擄C

-29擄C to +150擄C

-0.3 to 7.0V

-0.3 to +7.0V

APPLICATIONS

s

Consumer digital satellite decoders

s

Professional digital satellite decoders

s

Communication systems

AGC

IFIN

IFINB

AGC

I OUT

AGC

Q OUT

VCODIS

VCOA

VCOB

LO

0 deg

Quadrature

generator

90 deg

梅32

PSCAL

PSCALB

Fig.2. SL1710 block diagram

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