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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–free
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.
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Supply Voltage Range: 2.7 to 6.5 V
VOICE SWITCHED
SPEAKERPHONE CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
Freescale Semiconductor, Inc...
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P SUFFIX
PLASTIC PACKAGE
CASE 724
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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: –40 to + 85°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
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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
VB
RLO
(Top View)
ORDERING INFORMATION
Device
MC33219ADW
MC33219AP
Operating
Temperature Range
TA = – 40° to +85°C
Package
SOIC
Plastic DIP
Speaker
Speaker Amplifier
Receive
In
This device contains 384 active transistors.
©
Motorola, Inc. 1995
MOTOROLA ANALOG IC DEVICE DATA
For More Information On This Product,
Go to: www.freescale.com
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