MC33219A Datasheet, PDF (1/28 Pages) Motorola, Inc – Voice Switched Speakerphone

Freescale Semiconductor, Inc.^{Order this document by MC33219A/D}
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.
• Supply Voltage Range: 2.7 to 6.5 V
• 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
Microphone
Mute
VB
Simplified Block Diagram
Transmit
Out
Tx Attenuator
VB
BNM
Attenuator Control
Vol
Cont
CD
VCC
Reg.
VB
DTD
Rx Attenuator
MC33219A
BNM
VB
VB
Speaker
Speaker _Amplifier
This device contains 384 active transistors.
Receive
In
VOICE SWITCHED
SPEAKERPHONE CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
24
1
P SUFFIX
PLASTIC PACKAGE
CASE 724
24
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751E
PIN CONNECTIONS
CP2 1
XDI 2
CPT 3
TLI 4
TLO 5
VB 6
CT 7
CD 8
NC 9
CPR 10
RLI 11
RLO 12
24 VCC
23 TAO
22 TAI
21 MCO
20 MCI
19 VLC
18 MUTE
17 RXI
16 RXO
15 RAI
14 RAO
13 GND
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC33219ADW
SOIC
MC33219AP ^{TA = – 40° to +85°C} Plastic DIP
© Motorola, Inc. 1995
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