TEA1064A/C2 View Datasheet(PDF) - Philips Electronics

Part Name

Description

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TEA1064A/C2

Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting

Philips Electronics 

Philips Semiconductors

Low voltage versatile telephone transmission circuit

with dialler interface and transmit level dynamic limiting

Product specification

TEA1064A

Stabilized peripheral supply voltage

The configuration shown in Fig.8 provides a stabilized

voltage across pins VCC2 and SLPE for peripheral circuits

(such as dialling and control circuits); the DC voltage

VLN now varies with the peripheral supply current.

The VCC2-SLPE supply must be decoupled by capacitor

C15. For stable loop operation, resistor R16 (≈ 50 Ω) is

connected between VCC2 and SLPE in series with C15.

The voltage regulator control loop is completed by resistor

R15 between LN and VCC2.

For sets with an impedance of 600 Ω, practical values are:

R15 = 200 to 600 Ω; C15 = 220 µF; C3 = 470 nF. The

ratio R15/R16 ≤ 8 is for stable loop operation with

sufficient phase margin, and R15/R16 ≥ 6 is for

satisfactory set impedance in the audio frequency range.

For sets with complex impedance, the value of C3 and the

ratio R15/R16 are different (further information is given in

the TEA1064A Application Report(1)).

The peripheral supply capability depends mainly on the

available line current, the required AC output swing on the

line, the maximum permitted DC voltage on the line and

the values of external components (especially R15). With

R15 = 392 Ω and R16 = 56 Ω (basic application) the

maximum possible AC output swing on the line as a

function of line current is as shown in Fig.9, the curve

parameter is the peripheral supply current (Ip). Different

values for R15 (from 200 to 600 Ω) maintaining

6 < R15/R16 < 8 give different results (these are described

in the TEA1064A Application Report (1).

(1) Supplied on request.

handbook, full pagewidth

Rexch

Vexch

Rline

Iline

R15

Ip + 0.25 mA

R1

TEA1064A

ISLPE

ICC1

LN

VCC1

1

16

19

VCC2

DC

AC

17

10

REG STAB

C3

R5

20

SLPE

R9

0.25 mA

11

VEE

C1 R16

Ip

C15

peripheral

circuits

Vp

MGR063

Fig.8 Application with stabilized supply voltage for peripheral circuits: R15 = 392 Ω; R16 = 56 Ω.

March 1994

9

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