SA625 datasheet(2/14 Pages) PHILIPS

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Philips Semiconductors

Product specification

SA625

High performance low power mixer FM IF system

with high-speed RSSI

1997 Nov 07

853-1648 18664

DESCRIPTION

The SA625 is pin-to-pin compatible with the SA605, but has faster

RSSI rise and fall times. The SA625 is a high performance

monolithic low-power FM IF system incorporating a mixer/oscillator,

two limiting intermediate frequency amplifiers, quadrature detector,

muting, logarithmic received signal strength indicator (RSSI) with

fast rise and fall time, and voltage regulator. The SA625 combines

the functions of Signetics’ SA602A and SA624. The SA625 is

available in 20-lead SSOP (shrink small outline package).

For additional technical information please refer to application notes

AN1994, 1995 and 1996, which include example application

diagrams, a complete overview of the product and artwork for

reference.

FEATURES

• Fast RSSI rise and fall times

• Low power consumption: 5.8mA typical at 6V

• Mixer input to >500MHz

• Mixer conversion power gain of 13dB at 45MHz

• Mixer noise figure of 4.6dB at 45MHz

• XTAL oscillator effective to 150MHz (L.C. oscillator to 1GHz local

oscillator can be injected)

• 102dB of IF Amp/Limiter gain

• 25MHz limiter small signal bandwidth

• Temperature compensated logarithmic Received Signal Strength

Indicator (RSSI) with a dynamic range in excess of 90dB

• Two audio outputs - muted and unmuted

• Low external component count; suitable for crystal/ceramic/LC

filters

• Excellent sensitivity: 0.22µV into 50Ω matching network for 12dB

SINAD (Signal to Noise and Distortion ratio) for 1kHz tone with RF

at 45MHz and IF at 455kHz

• SA625 meets cellular radio specifications

PIN CONFIGURATION

RFIN 1

RF BYPASS 2

XTAL OSC

MUTEIN 5

RSSIOUT 7

20 MIXER OUT

18 IF AMP IN

16 IF AMP OUT

15 GND

14 LIMITER IN

LIMITER OUT

VCC 6

DK Package

MUTED AUDIO OUT 8

UNMUTED AUDIO OUT 9

QUADRATURE IN 10

IF AMP DECOUPLING

LIMITER DECOUPLING

SR00456

Figure 1. Pin Configuration

• ESD hardened

APPLICATIONS

• Digital cellular base stations

• High performance communications receivers

• Single conversion VHF/UHF receivers

• SCA receivers

• RF level meter

• Spectrum analyzer

• Instrumentation

• FSK and ASK data receivers

• Log amps

• Wideband low current amplification

• Digital cordless telephones

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

20-Pin Plastic Shrink Small Outline Package (SSOP) (Surface-mount)

-40 to +85

°C

SA625DK

SOT266-1

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