TEA1062N/TEA1062AN

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

11 of 13

www.unisonic.com.tw

QW-R108-011.C

4

9

QR

9

4

QR

4

9

QR

(2)

(1)

(a)

(b)

(c)

Fig.11 Alternative receiver arrangement

(a) Dynamic earpiece.

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

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

-6

-4

-2

0

0

20406080

100

120

140

Iline (mA)

R9=20

78.7k

110k

140k

(1) (2) (3)

(3)

(1)

(2)

R6=

R6=

R6=

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

→Gv

(dB)

R6=∞

Rexch(

Ω)

400

600

800

1000

R6(k

Ω)

36

100

78.7

×

×

Vexch(V)

48

140

110

93.1

82

60

×

×

120

102

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

supply voltage (Vexch) and exchange feeding bridge resistance(Rexch);R9=20

Ω.

10

6

11

7

12

13

1

4

5

2

3

16

8

15

14

9

MIC-

MIC+

REG AGC STAB SLPE

GAS2

GAS1

GAR

QR

LN

VCC

VEE

IR

DTMF

MUTE

R1 620

Ω

100

μF

C4

100pF

C7 1nF

C6

100pF

R4

100k

Ω

R7

68k

Ω

R9

20

Ω

R5

3.6k

Ω

R6

C3

4.7

μF

10

μF

C1

100

μF

Vi

Vi

600

Ω

C8 1nF

10 TO 140 mA

Vo

Fig.13 Test circuit defining voltage gain of MIC+, MIC- and DTMF inputs.