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MC33219A

Voice Switched Speakerphone

The Motorola MC33219A Voice Switched Speakerphone Circuit

incorporates the necessary amplifiers, attenuators, level detectors, and

control algorithm to form the heart of a high quality hands鈥揻ree

speakerphone system. Included are a microphone amplifier with mute,

transmit and receive attenuators, a background monitoring system for both

the transmit and receive paths, and level detectors for each path. An AGC

system reduces the receive gain on long lines where loop current and power

are in short supply. A dial tone detector prevents fading of dial tone. A Chip

Disable pin permits conserving power when the circuit is not in use. The

volume control can be implemented with a potentiometer.

The MC33219A can be operated from a power supply, or from the

telephone line, requiring typically 3.2 mA. It can be used in conjunction with a

variety of speech networks. Applications include not only speakerphones,

but intercoms and other voice switched devices.

The MC33219A is available in a 24 pin narrow body DIP, and a wide body

SOIC package.

鈥?/div>

Supply Voltage Range: 2.7 to 6.5 V

VOICE SWITCHED

SPEAKERPHONE CIRCUIT

SEMICONDUCTOR

TECHNICAL DATA

24

1

P SUFFIX

PLASTIC PACKAGE

CASE 724

鈥?/div>

Attenuator Range: 53 dB

Background Noise Monitor for Each Path

2 Point Signal Sensing

Volume Control Range: Typically 40 dB

Microphone and Receive Amplifiers Pinned Out for Flexibility

Microphone Amplifier can be Muted

Mute and Chip Disable are Logic Level Inputs

Chip Deselect Pin Powers Down the Entire IC

Ambient Operating Temperature: 鈥?0 to + 85擄C

24 Pin Narrow Body (300 mil) DIP and 24 Pin SOIC

CP2

XDI

CPT

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

VCC

TAO

TAI

MCO

MCI

VLC

MUTE

RXI

RXO

RAI

RAO

GND

24

1

DW SUFFIX

PLASTIC PACKAGE

CASE 751E

PIN CONNECTIONS

Simplified Block Diagram

Microphone

Transmit

Out

TLI

TLO

VB

Mute

VB

Tx Attenuator

VB

CT

CD

NC

BNM

Attenuator Control

CPR

RLI

Vol

Cont

CD

VCC

VB

Rx Attenuator

Reg.

MC33219A

BNM

DTD

VB

RLO

(Top View)

ORDERING INFORMATION

Device

MC33219ADW

MC33219AP

Operating

Temperature Range

TA = 鈥?40擄 to +85擄C

Package

SOIC

Plastic DIP

Speaker

Speaker Amplifier

Receive

In

This device contains 384 active transistors.

漏

Motorola, Inc. 1995

MOTOROLA ANALOG IC DEVICE DATA

1

MC33219ADW,MC33219AP,VOICE SWITCHED

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