L38812

UTC L388 12 LINEAR INTEGRATED CIRCUIT VOICE-SWITCH CIRCUIT FOR HANDSFREE SPEAKERPHONE TAM DESCRIPTION The UTC L388 12 contains all the necessary circuitry, amplifiers, detectors, comparators and control functions to implement a high performance, voice-switched, ”hands-free” function in an answering machine. The UTC L 388 12 is designed for answering machines that are either powered from the telephone line or from a mains powered dc. supply. Filtering of both the audio and control signals in both transmitter and receiver channels possible. An external loudspeaker amplifier has to be used, normally the same as used for the answering machine. SOP-16 DIP-18 FEATURES *Settable gain dynamics (25 or 50dB) *Low power consumption, totally 1.0mA at 3.3V typical. *Background noise compensation in the transmitting channel *with hold function. *Excellent noise performance. *Both channel input amplifiers have balanced inputs. *Minimum of external components needed for function. PIN CONFIGURATION 16-pin SO package CTR -Txin +Txin F2out Txout TxDetin TxDetout NDet 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 GND +V -Rxin F5out Rxout RxDetin RxDetout CMP F2out Txout TxDetin TxDetout N Det CMP RxDetout Rx Detin Rxout 1 2 3 4 5 6 7 8 9 18-pin DIP package 18 17 16 15 14 13 12 +Txin -Txin CTR NC GND +V -Rxin 11 +Rxin 10 F5out UTC UNISONIC TECHNOLOGIES CO. LTD 1 QW-R108-013,A UTC L388 12 PIN DESCRIPTIONS 16-pin SO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 LINEAR INTEGRATED CIRCUIT DESCRIPTIO...