UTCTEA1062A View Datasheet(PDF) - Unisonic Technologies

Part Name

Description

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UTCTEA1062A

LOW VOLTAGE TELEPHONE TRANSMISSION CIRCUIT WITH DIALLER INTERFACE

Unisonic Technologies 

UTCTEA1062/1062A LINEARINTEGRATEDCIRCUIT

QR 4

QR 4 (1)

QR 4 (2)

VEE 9

VEE 9

VEE 9

(a)

(b)

(c)

Fig.11 Alternative receiver arrangement

(a) Dynamic earpiece.

(b) Magnetic earpiece.The resistor marked(1) may be connected to prvent distortion(inductive load)

(c) Piezoelectric earpiece.The earpiece marked(2) is requirred to increase the phase margin (capacitive load)

Fig.12 Variation of gain with line urrent,with R6 as a parameter.

¡÷Gv

(dB)

0

R6=¡Þ

-2

R9=20Ω

-4

(1) (2) (3)

-6

(1) R6= 78.7kΩ

(2) R6= 110kΩ

(3) R6= 140kΩ

0 20 40 60 80 100 120 140

Iline (mA)

Rexch(Ω)

400

600

800

1000

R6(kΩ)

36

100

78.7

¡Á

¡Á

Vexch(V)

48

140

110

93.1

82

60

¡Á

¡Á

120

102

Table 1 Values of resistor R6 for optimum line loss compensation,for various usual values of exchange

supply vloltage(Vexch) and exchange feeding bridge resistance(Rexch);R9=20Ω.

UTC UNISONIC TECHNOLOGIES CO., LTD. 11

QW-R108-001,A

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