DESCRIPTION

The SA604A 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 SA604A features higher IF bandwidth (25MHz) and temperature compensated RSSI and limiters permitting higher performance application compared with the SA604. The SA604A is available in a 16-lead SO (surface-mounted miniature) package.

FEATURES

• Low power consumption: 3.3mA typical

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

• 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

• SA604A meets cellular radio specifications

APPLICATIONS

• 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