SA617 datasheet(2/17 Pages) PHILIPS

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Philips Semiconductors

Product specification

SA617

Low-voltage high performance mixer FM IF system

1997 Nov 07

853-1678 18665

DESCRIPTION

The SA617 is a low voltage high performance monolithic FM IF

system incorporating a mixer/oscillator, two limiting intermediate

frequency amplifiers, quadrature detector, logarithmic received

signal strength indicator (RSSI), voltage regulator and audio and

RSSI op amps. The SA617 is available in 20-lead SSOP package.

The SA617 was designed for portable communication applications

and will function down to 2.7V. The RF section is similar to the

famous SA605. The audio output has an internal amplifier with the

feedback pin accessible. The RSSI output is buffered. The SA617

also has an extra limiter output. This signal is buffered from the

output of the limiter and can be used to perform frequency check.

This is accomplished by comparing a reference frequency with the

frequency check signal using a comparator to a varactor or PLL at

the oscillator inputs.

FEATURES

• Low power consumption: 3.5mA typical at 3V

• Mixer input to >150MHz

• Mixer conversion power gain of 17dB at 45MHz

• XTAL oscillator effective to 150MHz (L.C. oscillator or external

oscillator can be used at higher frequencies)

• 102dB of IF Amp/Limiter gain

• 2MHz IF amp/limiter small signal bandwidth

• Temperature compensated logarithmic Received Signal Strength

Indicator (RSSI) with a 80dB dynamic range

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

filters

• Excellent sensitivity: 0.31µV into 50Ω matching network for 12dB

SINAD (Signal to Noise and Distortion ratio) for 1kHz tone, 8kHz

deviation with RF at 45MHz and IF at 455kHz

• SA617 meets cellular radio specifications

• Audio output internal op amp

• RSSI output internal op amp

• Buffered frequency check output

PIN CONFIGURATION

RF IN+

RF IN– DECOUPLING

OSCOUT

OSCIN

RSSI OUT

20 MIXER OUT

18 IF AMP IN

16 IF AMP OUT

15 GND

14 LIMITER IN

LIM OUT (+)

VCC

DK Package

AUDIO FEEDBACK

FREQ CHECK/LIM OUT (–)

QUADRATURE IN 10

IF AMP DECOUPLING

AUDIO OUT

IF AMP DECOUPLING

LIMITER DECOUPLING

SR00405

Figure 1. Pin Configuration

• Internal op amps with rail-to-rail outputs

• ESD protection: Human Body Model 2kV

Robot Model 200V

APPLICATIONS

• Portable cellular radio FM IF

• Cordless phones

• Narrow band cellular applications (NAMPS/NTACS)

• RF level meter

• Spectrum analyzer

• Instrumentation

• FSK and ASK data receivers

• Log amps

• Portable high performance communication receivers

• Single conversion VHF receivers

• Wireless systems

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

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

-40 to +85

°C

SA617DK

SOT266-1

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