DESCRIPTION

The SA578 is a unity gain level programmable compandor designed for low power applications. The SA578 is internally configured as an expandor and a compressor to minimize external component count. The summing amplifiers of the SA578 have 600Ω drive capability and the inverting input of the compressor amplifier is accessible through Pin 9 for summing multiple external signals. Power Down/Mute function is active low and requires an open collector output logic configuration at Pin 8. If Power Down/Mute is not needed, Pin 8 should be left open. When the part is muted, supply current drops to 170mA at 3.6V.

FEATURES

• Operating voltage range: 1.8V to 7V

• Low power consumption (1.4mA @ 3.6V)

• 0dB level programmable (10mVRMS to 1.0VRMS)

• Over 90dB of dynamic range

• Wide input/output swing capability

• Low external component count

• SA578 meets cellular radio specifications

• ESD hardened

• Power Down mode (ICC = 170µA @ 3.6V)

• Mute function

• Multiple external summing capability

• 600Ω drive capability

APPLICATIONS

• High performance portable communications

• Cellular radio

• Cordless telephone

• Consumer audio

• Wireless microphones

• Modems

• Electric organs

• Hearing aids

• Automatic level control (ALC)