PBL3726/6

PBL3726/6 is a standard version of the PBL3726 family of mask-programmable,monolothic intergrated speech circuits for use in electronic telephones.It is designed for use with a low impedance microphone. Transmitting and receiving gain is regulated wiht line length.Different regulation for various current feeds can be set by external resistors.Typical current feeds as 48 V 2 X 250 ohm, 48 V 2 X 400 ohm and 36 V 2 X 500 ohm can be handled.Applicaiton dependent parameters like impedance to the line, side tone level, gain and frequency response are set by external components.Parameters are set independently which means easy adaption or various maket meeds.

It has many unique features: The first one is minimum number of inexpensive external components,5 capacitors and 12 resistors. The second one is mute function for parallel operation with DTMF-generator. The third one is transmit and receive gain regulation for automatic loop loss compensation. The forth one is short start-up time.The fifth one is balanced receiver output stage. The sixth one is differential mircophone input for good nalance to ground(common mode rejection),etc. There are some maximum ratings about it. Line voltage is 0 V min and 22 V max.line current(continous) is 0 mA min and 130 mA max. Operating temperature range is -40 min and +70 max.Storage temperature is -55 min and +125 max.

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