Datasheet > PBL3881N

PBL3881N

更新时间： 2023-01-02 23:25:30

品牌	Logo	应用领域
爱立信 - ERICSSON		光电二极管
页数	文件大小	规格书
16页	219K
描述
Speaker Phone Circuit, PDIP22, DIP-22

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PBL3881N 数据手册

PBL 3881

February 1996

PBL 3881

Voice-switched

Speakerphone Circuit

Description

Key Features

The PBL 3881 contains all the necessary circuitry, amplifiers, detectors, comparators

and control functions to implement a high performance, voice-switched,

loudspeaking, ”hands-free ” telephone. The gain dynamics (attenuation between

channels) is continuously adjustable (0-50 dB) via a separate pin. A background

noise detector in the transmitting channel reduces the influence of continuous noise

signals.

The PBL 3881 is designed for telephone line powered applications. The circuit

contains a transformerless power amplifier with a current supply circuitry that

eliminates the need of inductors (patented). Automatic volume attenuation in the

power amplifier extends the operating range at low line currents.

Filtering of the signals in both transmitter and receiver channels is possible.

Optional AGC function can be implemented into the receiver channel.

All pinnumbers refer to 22-pin DIP-package unless otherwise noted.

•

Adjustable gain range in the

attenuated channel (0 - 50 dB).

Direct telephone line powered solution

(patented).

Low power consumption, 2.2 mA at

3.2 V (typical).

Direct drive of an 25 - 50 ohm

loudspeaker.

22-pin dual in-line plastic, 24-pin SO

and 28-pin PLCC encapsulation.

Background noise compensation in the

transmitting channel.

•

Good noise performance.

Fully accessible in - and outputs of the

channel input amplifiers.

•

Minimum of external components

needed for function.

–

PBL

3881

28 pin PLCC

PBL 3881

Control

–

24 pin SO

PBL 3881

–

Ref.

22 pin DIP

Figure 1. Block diagram.

12 3 4 5 6 7...16

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