L6726

DESCRIPTION

The UTC L6726 is a mask-programmable, monolithic 

integrated speech circuits for using in electronic telephones. 

It is designed for using with a low impedance microphone. 

Transmitting and receiving gain are regulated with line length. 

Different regulation for various current feeds can be set by 

external resistors. Typical current feeds as 48V 2·200Ω, 48V,

2·400Ω, and 36V, 2·500Ω, can be handled. Application 

dependent parameters such as line balance, side tone level, 

amplification and frequency response are set by external 

components. Parameters are set independently which means 

easy adaptation for various market needs. 

The UTC L6726 is developed for using with CMOS-type 

dialer ICs. A separate DTMF input is switched when the circuit is 

muted, and an adjustable DC supply is provided for feeding an 

external CMOS device. 

FEATURES 

*Minimum number of inexpensive external components, 5 

capacitors and 11 resistors. 

*Mute function for operation with DTMF-generator. 

*Transmit and receive gain regulation for automatic loop loss 

compensation. 

*Extended current and voltage range 5~130mA, down to 2V. 

*Differential microphone input for good balance to ground. 

*Balanced receiver output stage. 

*Short start-up time. 

*Stabilized DC-supply for low current CMOS dialers and/or 

electret microphones. 

*DTMF-input controlled by mute.

规格书L6726