PBL38814

更新时间： 2024-09-23 22:44:35

品牌	Logo	应用领域
爱立信 - ERICSSON		开关放大器
页数	文件大小	规格书
14页	242K
描述
Voice - switched 2-channel Circuit with loudspeaker amplifier

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数据手册

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PBL38814 数据手册

May 1998

PRELIMINARY

PBL 388 14

Voice - switched 2-channel Circuit with

loudspeaker amplifier

Key Features

Description.

•

Minimum of external components

needed for function.

The PBL 388 14 contains all the necessary circuitry, amplifiers, detectors,

comparator and control functions to implement a high performance voice switched

handsfree two- way communication system. The gain dynamics (attenuation between

channels) is selectable (25dB or 50dB) via a separate pin. A background noise

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

signals to the switching .

The PBL 388 14 is designed for mains powered handsfree telephones, vehicular

mobile telephone handsfree systems and handsfree intercom systems. Automatic

volume attenuation in the power amplifier extends the operating range at low supply

currents. The circuit has two special features, the power amplifiers volume control can

be implemented either as an ac. potentiometer control or as a digital control by a µ-

processor (dc. control) and that the feedback loop of the power amplifier is accessible

thus making it possible to add a simple external power stage driving low impedance

loudspeakers up to several watts.

Selectable gain dynamics. (25 or 50

dB)

Lowpowerconsumption:≈1mA at 3.3V

(typical) for speech switching, audio

poweramplifierquiscentcurrent≈1mA.

•

Drives an 25 - 50 ohm loudspeaker

without a transformer.

Background noise compensation in the

transmitting channel with hold function

at receive.

Filtering is possible of both, the audio and the speech switching control signals,

in both transmitter and receiver channels.

•

Input amplifiers of both channels have

balanced inputs.

•

Exellent noise performance.

Encapsulated in 24 pin plastic ”skinny”

DIP and 24 pin SO .

PBL 388 14

Control

24 pin SO

–

Ref.

24 pin DIP

Figure 1. Block diagram.

12 3 4 5 6 7...14

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与PBL38814相关器件

型号	品牌	获取价格	描述	数据表
PBL38814/1N	ERICSSON	获取价格	Speaker Phone Circuit, PDIP24, SKINNY, PLASTIC, DIP-24
PBL38814/1SO	ERICSSON	获取价格	Speaker Phone Circuit, PDSO24, PLASTIC, SO-24
PBL38814/2SO:T	ERICSSON	获取价格	Telephone Speech Circuit, PDSO20, PLASTIC, SO-20
PBL388141N	ERICSSON	获取价格	Voice - switched 2-channel Circuit with loudspeaker amplifier
PBL388141SO	ERICSSON	获取价格	Voice - switched 2-channel Circuit with loudspeaker amplifier
PBL388141SOT	ERICSSON	获取价格	Voice - switched 2-channel Circuit with loudspeaker amplifier
PBL38814N	ERICSSON	获取价格	Speaker Phone Circuit, PDIP24, DIP-24
PBL38814SO	ERICSSON	获取价格	Speaker Phone Circuit, PDSO24, SO-24
PBL3881N	ERICSSON	获取价格	Speaker Phone Circuit, PDIP22, DIP-22
PBL3881QN	ERICSSON	获取价格	Speaker Phone Circuit, PQCC28, PLASTIC, LCC-28