U4037B Datasheet, PDF (1/6 Pages) TEMIC Semiconductors – LOW VOLTAGE SPEECH CIRCUIT WITH TONE RINGER INTERFACE

U4037B
Low Voltage Speech Circuit with Tone Ringer Interface
Description
TELEFUNKEN microelectronic’s low voltage speech
and ringer interface circuit, U4037B performs all neces-
sary speech, line interface functions and the tone ringer
required in an electronic telephone set.
The circuit is line powered and contains all components
necessary for amplification of signals and adaption to the
line. The power supply of U4037B provides the MCU
during the ringing and the speech mode.
Features
Speech Circuit
D Adjustable dc characteristic
D Symmetrical input of microphone amplifier
D Receiving amplifier for dynamic or piezo-electric
earpieces
D Automatic line loss compensation
D MCU controlled earphone gain 8 dB
D Anti-clipping in transmit direction
Tone Ringer Interface
D Adjustable volume via 2 bit D/A converter
D Adjustable threshold
D MCU power supply
Benefits
D Low number of external components
Applications
Standard, telephones, fax machines
TELEFUNKEN Semiconductors
1 (6)
Rev. A1, 08-Oct-96
Preliminary Information