Description.
PBL 38571 is a monolithic integrated speech transmission circuit for use in electronic telephones and as DECT line interface with balanced in - and output. It is designed to accomodate either a low impedance dynamic microphone or an electret microphone that can be supplied from the circuits own DC - supply. A signal summing point at the transmitter input is available.

Key features.
• Minimum number of external components, 5 capacitors and 10 resistors.
• Easy adaption to various market needs.
• Mute control input for operation with DTMF - generator.
• Transmitter and receiver gain regulation for automatic loop loss compensation. Disconnectable.
• Extended current and voltage range 5 - 130 mA, down to 2 V.
• Differential microphone input for good balance to ground.
• Balanced receiver output stage.
• In 16 - pin DIP and SO BW batwing packages.
• Short start up time.
• Excellent RFI performance.