MC33111 Datasheet, PDF (1/12 Pages) Motorola, Inc – Low Voltage Compander

MOTOROLA
SEMICONDUCTOR
TECHNICAL DATA
Order this data sheet by MC33111/D
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.
• 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
Simplified Block Diagram
Expander ^0.5 14
Input
11
1.0 µF
Compressor
Input
3
MC33111
10 k
20 k
15 k _{∆ Gain}
40 k
Vb
Rectifier
0.5
1.0 µF ⁵
V+
10
9 ^Vb
Vb
∆ Gain
7.5 k
40 k
Rectifier
Vb
Bias &
Reference
Generator
Mute/
Passthrough
Logic
Microphone
7
6
Expander
15 ^Output
Compressor
2 ^Output
16 _VCC
1
4
CM
12 _EM
8
PT
This document contains information on a new product. Specifications and information herein are subject to change
without notice. This device contains 329 active transistors.
LOW VOLTAGE
COMPANDER
SILICON MONOLITHIC
INTEGRATED CIRCUIT
16
1
P SUFFIX
PLASTIC PACKAGE
CASE 648
16
1
D SUFFIX
PLASTIC PACKAGE
CASE 751B
(SO-16)
TRUTH TABLE
CM EM PT
Function
0
0
0
1
X
X
X
1
X
0
0
1
Normal
Comp. Mute
Expander Mute
Passthrough
ORDERING INFORMATION
Device
Temperature
Range
Package
MC33111D
MC33111P
– 40° to + 85°C
SO-16
Plastic DIP
© Motorola, Inc. 1994