SA626 datasheet(2/16 Pages) PHILIPS

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Philips Semiconductors

Product specification

SA626

Low voltage high performance mixer FM IF

system with high-speed RSSI

1997 Sept 25

853-1723 18427

DESCRIPTION

The SA626 is a low-voltage high performance monolithic FM IF

system incorporating a mixer/oscillator, two limiting intermediate

frequency amplifiers, quadrature detector, high speed logarithmic

received signal strength indicator (RSSI), voltage regulator and

audio and fast RSSI op amps. The SA626 is available in 20-lead

SOL (surface-mounted small outline large package) and 20-lead

SSOP (shrink small outline package).

The SA626 was designed for high bandwidth portable

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

section is similar to the famous NE605. The audio and RSSI

outputs have amplifiers. The RSSI output has access to the

feedback pin. This enables the designer to level adjust the outputs

or add filtering.

SA626 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

• Digital cordless telephones

• Digital cellular telephones

• Digital cellular base stations

• Portable 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

FEATURES

• Fast RSSI rise and fall times

• Low power consumption: 6.5mA typ at 3V

• Power down mode (I

CC = 200µA)

PIN CONFIGURATION

RFIN 1

RF BYPASS 2

XTAL OSC EMITTER

XTAL OSC (BASE)

RSSIOUT 7

20 MIXER OUT

18 IF AMP IN

16 IF AMP OUT

15 GND

14 LIMITER IN

LIMITER OUT

D and DK Packages

POWER DOWN CONTROL 8

AUDIO OUT 9

QUADRATURE IN 10

IF AMP DECOUPLING

LIMITER DECOUPLING

VCC 5

RSSI FEEDBACK

SR00470

Figure 1. Pin Configuration

• Mixer input to >500MHz

• Mixer conversion power gain of 11dB at 240MHz

• Mixer noise figure of 14dB at 240MHz

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

oscillator can be injected)

• 92dB of IF Amp/Limiter power gain

• 25MHz limiter small signal bandwidth

• Temperature compensated logarithmic Received Signal Strength

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

• Audio output internal buffer

• RSSI output internal buffer

• Internal op amps with rail-to-rail outputs

• 10.7MHz filter matching (330Ω) reduces 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

• SA626 meets cellular radio specifications

• ESD hardened

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

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

-40 to +85

°C

SA626D

SOT163-1

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

-40 to +85

°C

SA626DK

SOT266-1

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