U4091B Datasheet, PDF (2/11 Pages) TEMIC Semiconductors – Programmable Telephone Audio Processor

U4091B
TELEFUNKEN Semiconductors
Serial Bus Controlled Functions
Speech circuit
D Transmit gain: 36 to 52 dB (1 dB step)
D Receive gain: –7 dB to +9 dB (1 dB step) + one 6 dB
step
D Speaker amplifier gain: –10 dB to +30 dB (1.5 dB
step)
D Mute R, Mute T
D Automatic gain adjustment ( AGA ): 7 different
characteristics
W D Impedance selection: 600/ 900
Ringer
D Volume adjustment
Voice switch
D Volume adjustment
D Attenuation range: 0 to 50 dB (1 dB steps)
D 4 thresholds for mode switching
D Mute of handsfree microphone
D Chip disable
D Hand set / handsfree switching
D Four point level detection
2 (11)
Preliminary Information
Rev. A1: 12.07.1995