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SA627

High performance low power FM IF system with high-speed RSSI

Philips Electronics 

Philips Semiconductors

High performance low power mixer FM IF system

with high-speed RSSI

Product specification

SA627

DESCRIPTION

The SA627 has faster RSSI rise and fall times. The SA627 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, voltage regulator and

frequency check/limiter out (–). The SA627 also has an extra limiter

output. This signal is buffered from the output of the limiter and

provides a negative (–) limiter output. This can be used to provide a

frequency check function. The SA627 is available in 20-lead SOL

(surface-mounted miniature package) and 20-lead SSOP (shrink

small outline package).

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

• Audio output - mutable

• 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, 8kHz

deviation with RF at 45MHz and IF at 455kHz

• SA627 meets cellular radio specifications

• ESD hardened

PIN CONFIGURATION

D and DK Packages

RFIN 1

RF BYPASS 2

XTAL OSC 3

XTAL OSC 4

MUTEIN 5

VCC 6

RSSIOUT 7

MUTED AUDIO OUT 8

QUADRATURE IN 9

FREQ CHECK/ LIM OUT (–) 10

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 (+)

Figure 1. Pin Configuration

SR00481

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

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

ORDER CODE

SA627D

SA627DK

DWG #

SOT163-1

SOT266-1

1997 Nov 07

2

853-1649 18664

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