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U4055B1

Part Number	U4055B1
Manufacturer	TEMIC Semiconductors
Description	Low-Voltage Electronic Speech Circuit
Published	Jul 14, 2008
Detailed Description	U4055B/U4055B1 Low-Voltage Electronic Speech Circuit with Dialer Interface Description The U4055B electronic speech circ...
Datasheet	U4055B1 PDF File

Overview

U4055B/U4055B1 Low-Voltage Electronic Speech Circuit with Dialer Interface Description The U4055B electronic speech circuit is a linear integrated circuit for use in telephone and other line fed terminal equipment.
It replaces the common speech circuit with carbon microphone, hybrid transformer, sidetone equivalent and ear protection rectifiers.
A low-cost electrodynamic transducer is used as the earphone.
It contains all components necessary for amplification of signals and adaption to the line.
Features www.
DataSheet4U.
com D An electronic circuit replaces the microphone hybrid transformer D Symmetrical input for dynamic or piezo microphone D High performance through the use of dynamic transducers as the earphone (non-linear distortion 2 %) D DTMF interface with muting D Supply voltage for dialer D High range of line feeding current D Input resistance independent of line current and sidetone suppression circuit.
D Built-in ear protection by earphone voltage limiter D Operation possible from 8 mA x D Automatic line loss compensation U4055B1: High level mute; U4055B: Low level mute Figure 1.
Block diagram and pin connection TELEFUNKEN Semiconductors Rev.
A1, 06-May-96 1 (10) Preliminary Information U4055B/U4055B1 Pin Description Pin 1, 2 Symbol Function H1 and H2 The push-pull complementary outputs of the receive amplifier.
Dynamic transducers with a minimum impedance of 100 W can be directly driven by these outputs.
GND Ground.
ST The output of the sidetone cancellation signal, which requires a balanced impedance of 8–10 times the subscribers line impedance to be connected to Pin 13.
CK2 Input to the line output driver amplifier.
Transmit a.
g.
c.
applied to this stage.
CK1 The transmit pre-amp output respective of the DTMF output which is normally capacitively coupled to Pin 5.
MIC 1, Inputs of symmetrical MIC 2 microphone amplifier with high common mode rejection ratio.
DTMF IN The DTMF input has an internal resistor connected to ground.
It provides the lo...

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