U4055B datasheet(2/10 Pages) TEMIC

Part #	U4055B

Description	Low-Voltage Electronic Speech Circuit with Dialer Interface

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Manufacturer	TEMIC [TEMIC Semiconductors]

Direct Link	http://www.temic.de

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U4055B/U4055B1

TELEFUNKEN Semiconductors

Rev. A1, 06-May-96

Preliminary Information

2 (10)

Pin Description

Symbol

Function

1, 2

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.

3

GND

Ground.

4

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.

5

CK2

Input to the line output driver

amplifier. Transmit a.g.c. applied

to this stage.

6

CK1

The transmit pre-amp output

respective of the DTMF output

which is normally capacitively

coupled to Pin 5.

7, 8

MIC 1,

MIC 2

Inputs of symmetrical

microphone amplifier with high

common mode rejection ratio.

9

DTMF IN The DTMF input has an internal

resistor connected to ground. It

provides the load resistor for the

emitter of a CMOS DTMF

generator. This input is only

active when MUTE (Pin 10) is

pulled high or MUTE is pulled

low.

10

MUTE or

MUTE

The MUTE input must be pulled

at least at 1.5 V (MUTE) or at

less than 0.5 V (MUTE) to mute

the MIC Amp. and Audio Amp.

and enable DTMF IN.

Symbol

Function

11

V+

Regulated output voltage of

2.7 V for biasing a DTMF

generator activated by MUTE.

12

REC IN

The receive amplifier input. The

receiving amplification is

regulated of an a.g.c.

13

VL

Positive supply voltage input to

the device. This input should be

connected to the positive output

of the polarity guard. The current

through this pin is modulated by

the transmit signal.

14

RDC

An external resistor (2 W) is

required from this pin to GND to

control the dc input impedance

of the circuit. It has a nominal

value of 56

W for low voltage

operation. Values up to 100

W

may be used to increase the

available transmit output voltage

swing at the expense of low-

voltage operation.

15

VI

This internal voltage bias line

must be connected to VL via an

external resistor, RB, which

dominates the ac input imped-

ance of the circuit and should be

620

Ω for an 600 W input

impedance or 910

Ω for a 900 Ω

input impedance.

16

RAGC

The range of transmit and

receive gain variations between

short and long loops may be

adjusted by connecting a resistor

REX1 from this pin to Pin 3

(GND). This pin can be left open

to set a.g.c. out of action.

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