TEA1066T 데이터 시트보기 (PDF) - Philips Electronics

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TEA1066T

Versatile telephone transmission circuit with dialler interface

Philips Electronics 

Philips Semiconductors

Versatile telephone transmission circuit

with dialler interface

Product specification

TEA1066T

PINNING

SYMBOL PIN

DESCRIPTION

LN

1 positive line terminal

GAS1

2 gain adjustment transmitting

amplifier

GAS2

3 gain adjustment transmitting

amplifier

QR−

QR+

4 inverting output receiving amplifier

5 non-inverting output receiving

amplifier

GAR

6 gain adjustment receiving amplifier

MICL−

7 inverting microphone input, low

impedance

MICH−

8 inverting microphone input, high

impedance

MICL+

9 non-inverting microphone input, low

impedance

MICH+

10 non-inverting microphone input,

high impedance

STAB

11 current stabilizer

VEE

12 negative line terminal

IR

13 receiving amplifier input

PD

14 power-down input

DTMF

15 dual-tone multi-frequency input

MUTE

16 mute input

VCC

REG

17 supply voltage decoupling

18 voltage regulator decoupling

AGC

19 automatic gain control input

SLPE

20 slope (DC resistance) adjustment

handbook, halfpage

LN 1

20 SLPE

GAS1 2

19 AGC

GAS2 3

18 REG

QR− 4

17 VCC

QR+ 5

16 MUTE

TEA1066T

GAR 6

15 DTMF

MICL− 7

14 PD

MICH− 8

13 IR

MICL+ 9

MICH+ 10

12 VEE

11 STAB

MBH120

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

Supplies: VCC, LN, SLPE, REG and STAB

Power for the TEA1066T and its peripheral circuits is

usually obtained from the telephone line. The TEA1066T

develops its own supply voltage at VCC and regulates its

voltage drop. The supply voltage VCC may also be used to

supply external peripheral circuits, e.g. dialling and control

circuits.

The supply has to be decoupled by connecting a

smoothing capacitor between VCC and VEE; the internal

voltage regulator has to be decoupled by a capacitor from

REG to VEE. An internal current stabilizer is set by a

resistor of 3.6 kΩ between STAB and VEE.

The DC current flowing into the set is determined by the

exchange supply voltage (Vexch), the feeding bridge

resistance (Rexch), the DC resistance of the telephone line

(Rline) and the DC voltage on the subscriber set

(see Fig.7).

If the line current Iline exceeds the current ICC + 0.5 mA

required by the circuit itself (approximately 1 mA) plus the

current Ip required by the peripheral circuits connected to

VCC, then the voltage regulator diverts the excess current

via LN.

1996 Apr 04

4

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