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.

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

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