pbl385411so-t ETC-unknow, pbl385411so-t Datasheet

pbl385411so-t

Manufacturer Part Number

pbl385411so-t

Description

Universal Speech Circuit

Manufacturer

ETC-unknow

Datasheet

1.PBL385411SO-T.pdf (14 pages)

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Description.

electronic telephones or in any other line interface application. High settable supply

current for auxiliary functions, up to 6.0 mA (at high line currents). The circuit is designed

to accomodate either a low impedance dynamic or an electret microphone. Microphone

can be muted separately. Payphone signaling and DTMF dialling tones have a separate

input that is controlled by a mute signal.

transmitter input. An internally preset line length compensation can be adjusted with

external resistors to fit into different current feed systems as for ex. 48 V, 2 x 200 ohms,

48 V, 2 x 400 ohms and 48 V, 2 x 800 ohms. The line length compensation can be shut

off in either high or low gain mode. Application dependent parameters such as line

balance, side tone level, transmitter and receiver gains and frequency responces are set

independently by external components which means an easy adaption to various market

needs. The setting of the parameters if carried out in certain order will counteract the

interaction between the settings. The circuit provides four different DC - supplies to feed

microphones,diallers and other more current consuming functions like handsfree systems.

Pin numbers in this datasheet refer to 18-pin DIP package unless otherwhise noted.

Figure 1. Functional diagram DIP package.

DC1- output for

external devices

DC2 - output for

external devices

(active low)

DTMF

Mic.

input

Mute

PBL 38541 is a monolithic integrated speech transmission circuit for use in

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

5. DC supply components

DC-supply

regulation

Gain

PBL 385 41

A signal summing point is available at the

Universal Speech Circuit

Telephone

line

Key features.

•

20-pin plastic SO

Minimum number of

components, with two filtered DC-

supplies, 7

resistors.

Easy adaption to various market

needs.

Mute control input for operation with

DTMF - generator.

A separate signaling input for

payphone and DTMF tones controlled

by mute.

Transmitter and receiver gain

regulation for automatic loop loss

compensation.

Extended current and voltage range

4 - 130 mA, down to 2 .2V.

Differential microphone input for good

balance to ground.

Balanced receiver output stage.

One stabilized DC - supply for low

current CMOS diallers and or electret

microphones. One settable current

limited supply with 6 mA max. current.

Short start up time.

Excellent RFI performance.

18 - pin DIP and 20 - pin SO packages.

PBL 385 41

November 1998

capacitors and 11

18-pin plastic DIP

PBL 385 41

external

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pbl385411so-t Summary of contents

Page 1

Description. PBL 38541 is a monolithic integrated speech transmission circuit for use in electronic telephones or in any other line interface application. High settable supply current for auxiliary functions 6.0 mA (at high line currents). The circuit is ...

Page 2

PBL 385 41 Maximum Ratings Parameter Line voltage Line current, continuous DIP Line current, continuous SO package Operating temperature range Storage temperature range No input should be set on higher level than pin 4 (+C). ...

Page 3

Electrical Characterisics cable and line rectifier unless otherwise specified. Amb Parameter Line voltage Transmitting gain, note 1 Transmitting range of regulation Transmitting frequency response Transmitter input impedance, pin 3 2 Microphone ...

Page 4

PBL 385 Mute GR DCS 1 DCO 2 DCO 1 Figure 5. Pin configuration. Pin Descriptions Refer to figure 5. DIP SO Name Function Output of the DC-regulator and transmitter amplifier, connected ...

Page 5

Functional description Design procedure; ref. to fig.4. The design is made easier through that all settable parameters are returned to gro- und (-line), this feature differs it from bridge type solutions.To set the parameters in the following order will result ...

Page 6

PBL 385 Figure 8. DC-Characteristics. (R6= will set the slope of the DC-char. and the rest of the level is set by some constants in the circuit ...

Page 7

PBL constant 385 41 current generator 11 DC- load DC-load = R4+R5 AC-load = R4+R5//Z Figure 9. Microphone amplifier output clipping. Transmitter amplifier The transmitter amplifier in PBL38541 consists of three stages. The first stage is an amplitude limiter for ...

Page 8

PBL 385 (b) ( and b) attn //( attn (d) (e) C ...

Page 9

Battery feed R1 R2a Regulation: } 700k 48V, 2 • 200 48V, 2 • 400 48V, 2 • 800 Sweden, apply for spec. application No regulation: All feedings Set for low gain 22k Set for high gain What is balancing ...

Page 10

PBL 385 41 Note that the signals at points a. and b. are 180 degrees off phase Zbal Note #1 R7 Zbal Note#2 The ac-signal at point c. is now 1/10 of the signal on ...

Page 11

DTMF input. The circuit provides a specific input at pin 10 for DTMF dialling signals. The output of the amplifier is controlled by the mute signal provided by the dialler. This input makes it easy to time the DTMF signals ...

Page 12

PBL 385 41 Short about Radio Frequency Interference RFI. HF suppression at the microphone in- put. The HF-signal at the microphone input can be seen composed as of two components. One component being the differential (between pins 12 and 13) ...

Page 13

Radio interference originating from mobile phones The problem with direct radiated RFI has accentuated nowadays because of the growing numbers of mobile and especially pocket telephones. Thus it is today rather common that a RF transmitter with output power of ...

Page 14

PBL 385 41 1-10M VDD CMOS 220 1 F DIALLER MUTE 9 MIC 220 DTMF 12 GND 33k 680p 100 3. Figure 24. ...

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