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SA608

Low voltage high performance mixer FM IF system

Philips Electronics 

Philips Semiconductors RF Communications Products

Low voltage high performance mixer FM IF system

Product specification

SA608

DESCRIPTION

The SA608 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 SA608 is available in 20-lead

dual-in-line plastic, 20-lead SOL

(surface-mounted miniature package) and

20-lead SSOP package.

The SA608 was designed for portable

communication applications and will function

down to 2.7V. The RF section is similar to

the famous NE605. The audio output is

buffered. The RSSI output has an internal

amplifier with the feedback pin accessible.

The SA608 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 limiter small signal bandwidth

• Temperature compensated logarithmic

Received Signal Strength Indicator (RSSI)

with a 90dB 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

• SA608 meets cellular radio specifications

• Audio output internal op amp

• RSSI output internal op amp

• Buffered frequency check output

• 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

PIN CONFIGURATION

D, DK and N Packages

RF IN+ 1

RF IN– 2

DECOUPLING

OSC- 3

OSOCUINT 4

RSSI 5

VCC 6

AUDIO 7

RSSI 8

FEEDBACK

FREQ CHECK/ 9

LIM OUT (–)

QUADRATURE 10

IN

20 MIXER OUT

19

IF AMP

DECOUPLING

18 IF AMP IN

17

IF AMP

DECOUPLING

16 IF AMP OUT

15 GND

14 LIMITER IN

13

LIMITER

DECOUPLING

12 LIMITER

DECOUPLING

11 LIMITER

OUT (+)

ORDERING INFORMATION

DESCRIPTION

20-Pin Plastic Dual In-Line Package (DIP)

20-Pin Plastic Small Outline Large (SOL) package (Surface-mount)

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

TEMPERATURE RANGE

-40 to +85°C

-40 to +85°C

-40 to +85°C

ORDER CODE

SA608N

SA608D

SA608DK

DWG #

0408B

0172D

1563

November 3, 1992

2

853-1679 08108

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