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PBL38571

High current Speech and Line interface Circuit

Ericsson  

PBJLun3e81597991

PBL 385 71

High current Speech and

Line interface Circuit

Description.

Key features.

PBL 38571 is a monolithic integrated speech transmission circuit for use in

• Minimum number of external

electronic telephones and as DECT line interface with balanced in - and output. It is

components, 5 capacitors and 10

designed to accomodate either a low impedance dynamic microphone or an electret

resistors.

microphone that can be supplied from the circuits own DC - supply. A signal summing • Easy adaption to various market

point at the transmitter input is available. An internally preset line length

needs.

compensation can be adjusted with external resistors to fit into different current feed • Mute control input for operation with

systems as for ex. 48 V, 2 x 200 ohms, 48 V, 2 x 400 ohms and 48 V, 2 x 800

DTMF - generator.

ohms.The line regulation can be shut off in low mode. Application dependent para-

• Transmitter and receiver gain

meters such as line balance, side tone level, transmitter and receiver gains and

regulation for automatic loop loss

frequency responces are set independently by external components which means an

compensation. Disconnectable.

easy adaption to various market needs. The setting of the parameters, if carried out in • Extended current and voltage range

certain order will counteract the interaction between the settings. It features high line

5 - 130 mA, down to 2 V.

current capability on a small footprint. Function compatible with the PBL 3781 family • Differential microphone input for

of speech circuits.

good balance to ground.

• Balanced receiver output stage.

• In 16 - pin DIP and SO BW batwing

packages.

• Short start up time.

• Excellent RFI performance.

10

AM

11

1

PBL 385 71

AT

AR

15

REC

87

9

3

2

4,5,

16

12,13.

14

+6

Mute

(active low)

4

2

3

+

1

Telephone

line

1. Impedance to the line and radio interference suppression

2. Transmitter gain and frequency responce network

3. Receiver gain and frequency responce network

4. Sidetone balance network

Figure 1. Functional diagram.

PBL 38571

16-pin plastic BW SO

PBL38571

16-pin plastic BW DIP

1

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