Order this data sheet by MC33111/D
MOTOROLA
SEMICONDUCTOR
TECHNICAL DATA
MC33111
Advance Information
Low Voltage Compander
The MC33111 contains two variable gain circuits configured for
compressing and expanding the dynamic range of an audio signal. One
circuit is configured as an expander, and the other is configured as a
compressor. Each circuit has a full wave rectifier to provide average value
information to a variable gain cell located in either the input stage or the
feedback path. An internal temperature stable bandgap reference provides
the necessary precision voltages.
Included in the MC33111 are controls for muting each section
independently, and for passthrough of both. Two uncommitted op amps
are available for peripheral functions.
The MC33111 will operate from a supply voltage of 3.0 V to 7.0 V, and
over a temperature range of – 40° to + 85°C. It is designed to
accommodate a 60 dB dynamic range; from – 40 dB to + 20 dB referenced
to 100 mVrms.
Applications include cordless telephone, CBs, walkie-talkies, and most
voice RF links, and any application where an improvement in the signal to
noise ratio is desired. Other applications include speakerphones and voice
activated intercoms, dictating machines, etc.
16
1
LOW VOLTAGE
COMPANDER
SILICON MONOLITHIC
INTEGRATED CIRCUIT
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•
•
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Operating Supply Voltage: 3.0 V to 7.0 V
Output Voltage Swing = 2.8 Vp-p with VCC = 3.0 V
No Precision External Components Required
60 dB Dynamic Range Compressed to 30 dB, Re-expandable to 60 dB
Unity Gain Level set at 100 mVrms
Attack and Decay Times Adjustable
Mute and Passthrough Controls
Two Uncommitted Op Amps
Temperature Compensated Reference
Available in Standard DIP and Surface Mount Packages
P SUFFIX
PLASTIC PACKAGE
CASE 648
16
1
Simplified Block Diagram
20 k
15 k
40 k
Rectifier
10 k
Vb
5
∆
Gain
Rectifier
10
9
Microphone
Vb
7
7.5 k
40 k
Bias &
Reference
Generator
Mute/
Passthrough
Logic
6
16
1
VCC
∆
Gain
Vb
Compressor
2 Output
Expander
15 Output
CM
0
1
X
0
EM
0
X
1
0
D SUFFIX
PLASTIC PACKAGE
CASE 751B
(SO-16)
11
1.0
µF
Compressor
3
Input
0.5
1.0
µF
V+
Expander
Input
0.5 14
MC33111
TRUTH TABLE
PT
0
X
X
1
Function
Normal
Comp. Mute
Expander Mute
Passthrough
ORDERING INFORMATION
4
12
8
CM
EM
PT
Device
MC33111D
MC33111P
Temperature
Range
– 40° to + 85°C
Package
SO-16
Plastic DIP
©
Motorola, Inc. 1994
Vb
This document contains information on a new product. Specifications and information herein are subject to change
without notice. This device contains 329 active transistors.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
