SA636 datasheet(2/17 Pages) PHILIPS

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Philips Semiconductors

Product specification

SA636

Low voltage high performance mixer FM IF

system with high-speed RSSI

1997 Nov 07

853-1757 18664

DESCRIPTION

The SA636 is a low-voltage high performance monolithic FM IF

system with high-speed RSSI incorporating a mixer/oscillator, two

limiting intermediate frequency amplifiers, quadrature detector,

logarithmic received signal strength indicator (RSSI), voltage

regulator, wideband data output and fast RSSI op amps. The

SA636 is available in 20-lead SSOP (shrink small outline package).

The SA636 was designed for high bandwidth portable

communication applications and will function down to 2.7V. The RF

section is similar to the famous SA605. The data output has a

minimum bandwidth of 600kHz. This is designed to demodulate

wideband data. The RSSI output is amplified. The RSSI output has

access to the feedback pin. This enables the designer to adjust the

level of the outputs or add filtering.

SA636 incorporates a power down mode which powers down the

device when Pin 8 is low. Power down logic levels are CMOS and

TTL compatible with high input impedance.

APPLICATIONS

• DECT (Digital European Cordless Telephone)

• Digital cordless telephones

• Digital cellular telephones

• Portable high performance communications receivers

• Single conversion VHF/UHF receivers

• FSK and ASK data receivers

• Wireless LANs

FEATURES

• Wideband data output (600kHz min.)

• Fast RSSI rise and fall times

• Low power consumption: 6.5mA typ at 3V

• Mixer input to >500MHz

• Mixer conversion power gain of 11dB at 240MHz

• Mixer noise figure of 12dB at 240MHz

PIN CONFIGURATION

RFIN

RF BYPASS

RSSIOUT

MIXER OUT

IF AMP IN

IF AMP OUT

GND

LIMITER IN

LIMITER OUT

DK Package

POWER DOWN CONTROL

DATA OUT

QUADRATURE IN

IF AMP DECOUPLING

LIMITER DECOUPLING

VCC

RSSI FEEDBACK

XTAL OSC

(EMITTER)

XTAL OSC

(BASE)

SR00491

Figure 1. Pin Configuration

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

oscillator can be injected)

• 92dB 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

• RSSI output internal op amp

• Internal op amps with rail-to-rail outputs

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

filters

• Excellent sensitivity: 0.54µV into 50Ω matching network for 12dB

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

at 240MHz and IF at 10.7MHz

• ESD hardened

• 10.7MHz filter matching (330Ω)

• Power down mode (I

CC = 200µA)

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

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

-40 to +85

°C

SA636DK

SOT266-1

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