U4037B Просмотр технического описания (PDF) - Temic Semiconductors

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U4037B

Low Voltage Speech Circuit with Tone Ringer Interface

Temic Semiconductors 

Pin Description

Pin Symbol

Function

OUT Buzzer output

MELI Melody input

RECO1 Output of the receiver amplifier

RECO2 Suitable for dynamic or piezoelec-

tronic transducers

GND Ground

ST The output of the sidetone can-

cellation signal, which requires a

balanced impedance of 8 to

10 times the subscribers line

impedance to be connected to

Pin VL.

TIN Input to the line output driver

amplifier, transmit a.g.c. applied

to this stage

MICO Transmit pre-amplifier output

MIC 1,

MIC 2

Inputs of symmetrical microphone

amplifier with high common mode

rejection ratio

VDD Regulated output voltage of for

biasing the MCU

RECIN Receive amplifier input

The receiving amplification is

regulated by an a.g.c.

VL Positive supply voltage input to

the device

The current through this pin is

modulated by the transmit signal.

U4037B

Pin Symbol

Function

SWAMP

An external resistor (1 W) is

required from this pin to GND to

control the dc input impedance of

the circuit. It has a nominal value

W of 56 for low voltage operation.

VOI1 Volume adjustment of ringer and

VOI2 earphone amplifier

RFO Output for ringing frequency

detection

VI This internal voltage bias line

must be connected to VL via an

external resistor, RB, which domi-

nates the ac input impedance of

W the circuit and should be 620 Ω

for an 600 input impedance or

910 Ω for a 900 Ω input

impedance.

RAGC

The range of transmit and receive

gain variations between short and

long loops may be adjusted by

connecting a resistor RAGC from

this pin to (GND). This pin can be

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

DTMF DTMF input

MUTE Control input for DTMF operation

VB Ringer supply

RDC Input for setting the DC

characteristic

TELEFUNKEN Semiconductors

3 (6)

Rev. A1, 08-Oct-96

Preliminary Information

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