TEA1110AT/C1 Просмотр технического описания (PDF) - Philips Electronics

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TEA1110AT/C1

Low voltage versatile telephone transmission circuit with dialler interface

Philips Electronics 

Philips Semiconductors

Low voltage versatile telephone

transmission circuit with dialler interface

Product specification

TEA1110A

PINNING

SYMBOL PIN

DESCRIPTION

LN

1 positive line terminal

SLPE

2 slope (DC resistance) adjustment

REG

3 line voltage regulator decoupling

n.c.

4 not connected

DTMF

5 dual-tone multi-frequency input

MUTE

6 mute input to select speech or

dialling mode (active LOW)

IR

7 receiving amplifier input

AGC

8 automatic gain control/

line loss compensation

MIC−

MIC+

9 inverting microphone amplifier input

10 non-inverting microphone amplifier

input

VEE

11 negative line terminal

QR

12 receiving amplifier output

GAR

13 receive gain adjustment

VCC

14 supply voltage for speech circuit and

peripherals

handbook, halfpage

LN 1

SLPE 2

14 VCC

13 GAR

REG 3

12 QR

n.c. 4 TEA1110A(T) 11 VEE

DTMF 5

10 MIC+

MUTE 6

9 MIC−

IR 7

8 AGC

MGG735

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

All data given in this chapter are typical values, except

when otherwise specified.

Supply (pins LN, SLPE, VCC and REG)

The supply for the TEA1110A and its peripherals is

obtained from the telephone line. See Fig.3.

The IC generates a stabilized reference voltage (Vref)

between pins LN and SLPE. Vref is temperature

compensated and can be adjusted by means of an

external resistor (RVA). Vref equals 3.35 V and can be

increased by connecting RVA between pins REG

and SLPE (see Fig.4), or decreased by connecting RVA

between pins REG and LN. The voltage at pin REG is

used by the internal regulator to generate Vref and is

decoupled by CREG, which is connected to VEE. This

capacitor, converted into an equivalent inductance

(see Section “Set impedance”), realizes the set

impedance conversion from its DC value (RSLPE) to its AC

value (RCC in the audio-frequency range). The voltage at

pin SLPE is proportional to the line current.

The voltage at pin LN is:

VLN = Vref + RSLPE × ISLPE

ISLPE = Iline – ICC – IP – I∗

Where:

Iline = line current

ICC = current consumption of the IC

IP = supply current for peripheral circuits

I* = current consumed between LN and VEE.

The preferred value for RSLPE is 20 Ω. Changing RSLPE will

affect more than the DC characteristics; it also influences

the microphone and DTMF gains, the gain control

characteristics, the sidetone level and the maximum

output swing on the line.

1997 Apr 22

4

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