DESCRIPTION

The SA624 is pin-to-pin compatible with the SA604A, but has faster RSSI rise and fall time. The SA624 is an improved monolithic low-power FM IF system incorporating two limiting intermediate frequency amplifiers, quadrature detector, muting, logarithmic received signal strength indicator, and voltage regulator. The SA624 features higher IF bandwidth (25MHz) and temperature compensated RSSI and limiters permitting higher performance application compared with the SA604. The SA624 is available in 16-lead SO (surface-mounted miniature) package.

FEATURES

• Low power consumption: 3.4mA typical

• Temperature compensated logarithmic Received Signal Strength Indicator (RSSI) with a dynamic range in excess of 90dB

• Fast RSSI rise and fall time

• Two audio outputs - muted and unmuted

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

• Excellent sensitivity: 1.5µV across input pins (0.22µV into 50Ω matching network) for 12dB SINAD (Signal to Noise and Distortion ratio) at 455kHz

• SA624 meets cellular radio specifications

APPLICATIONS

• Digital cellular base station

• Cellular radio FM IF

• High performance communications receivers

• Intermediate frequency amplification and detection up to 25MHz

• RF level meter

• Spectrum analyzer

• Instrumentation

• FSK and ASK data receivers