TEA1064AT View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TEA1064AT

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

The DC line voltage on LN is

VLN = VLN-SLPE + (ISLPE × R9).

Therefore

VLN = Vref + ([Ip + 0.25 × 10−3 A] × R15) +

([lline − ICC1 − 0.25 × 10−3 A] × R9)

in which:

Vref is the internal reference voltage between VCC2 and

SLPE (the value of Vref can be adjusted by an external

resistor, RVA). Vref = 3.3 V (typ.) without RVA

Ip is the supply current used by peripheral circuits

R15 is an external resistor between LN and VCC2 (392 Ω

in the basic application)

R9 is an external resistor between SLPE and

VEE (20 Ω in the basic application)

8

handbook, halfpage

VLN(p-p)

(V)

6

4

MGR064

Ip = 4 mA

2 mA

0 mA

handbook5, .h5alfpage

VLN-SLPE

(V)

5.0

4.5

4.0

MGR065

R15 = 511 Ω

392 Ω

301 Ω

3.5

3.0

0

1

2

3

4

Ip (mA)

VCC2-SLPE can be adjusted between approximately 3.3 and 4.3 V by

changing the value of RVA, this results in a parallel-shift of the curves.

The total voltage drop VLN ≈ VLN-SLPE + ([Iline − 1.55 mA] × R9).

Fig.10 Curves showing the typical voltage drop

between LN and SLPE as a function of the

supply current for peripherals with R15 as a

parameter: VCC2-SLPE = 3.3 V (RVA not

connected).

2

0

10

20

Iline (mA)

30

As different values of R15 and R16 are allowed, different curves

would then apply

Fig.9

Maximum output swing on line as a function

of line current with the peripheral supply

current as a parameter; R15 = 392 Ω;

R16 = 56 Ω.

handbook, halfpage

Leq

R9

20 Ω

Req

C3

470 nF

LN

R1

620 Ω

VEE

MGR066

Req

=

Rp





RR-----11----56-

+

1

Leq = C3 × R9 × Req with Rp= 15 kΩ

The DC voltage VLN-SLPE as a function of Ip with R15 as a

parameter is shown in Fig.10. In the audio frequency

range, the dynamic impedance is determined mainly by

R1. The equivalent impedance in the audio range of the

circuit (Fig.8) is shown in Fig.11.

Fig.11 Equivalent impedance between LN and

VEE at f > 300 Hz in the application with

stabilized supply voltage for peripheral

circuits.

March 1994

10

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