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MC33111 Datasheet

Low Voltage Compander

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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
Rectifier
7.5 k
40 k
Vb
Bias &
Reference
Generator
Mute/
Passthrough
Logic
Microphone
76
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
00
1X
X1
00
0
X
X
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


Motorola Electronic Components Datasheet

MC33111 Datasheet

Low Voltage Compander

No Preview Available !

Name
Ground
Compressor Output
Compressor Input
Compressor Mute
Compressor Filter
Amplifier #1
Passthrough
Amplifier #2
Expander Filter
Expander Mute
No Connect
Expander Input
Expander Output
VCC
Pin
1
2
3
4
5
6, 7
8
9, 10
11
12
13
14
15
16
PIN FUNCTION DESCRIPTION
Description
Connect to a clean power supply ground.
Output of the compressor section.
Compressor input. The input impedance is nominally 10 k. Nominal signal range is
1.0 mVrms to 1.0 Vrms in normal mode, and up to 0.8 Vrms in passthrough mode.
Must be capacitor coupled to the signal source.
A logic high mutes the compressor. A logic low permits normal operation and passthrough.
Connect an external capacitor to filter the full wave rectifier’s output.
This capacitor affects attack and decay times, and low frequency accuracy.
Inverting input (7) and output (6) of an op amp internally referenced to Vb.
A logic high sets the gain of both expander and compressor to 0 dB, independent of
input level.
Inverting input (9) and output (10) of an op amp internally referenced to Vb.
Connect an external capacitor to filter the full wave rectifier’s output.
This capacitor affects attack and decay times, and low frequency accuracy.
A logic high mutes the expander. A logic low permits normal operation and passthrough.
This pin is not internally connected to anything.
Expander input. The input impedance is nominally 10.9 k. Nominal signal range is
10 mVrms to 316 mVrms in normal mode, and up to 1.0 Vrms in passthrough mode.
Must be capacitor coupled to the signal source.
Output of the expander section.
Power supply. Connect to a power supply voltage in the range of 3.0 V to 7.0 V.
Bypass capacitor should be provided at this pin.
Compressor
Rectifier
Gain
Vin Vb
10 k
Ǹ+Vout 0.3162 x Vin
TRANSFER FUNCTIONS
Compression
Expansion
20 dB 1.0 V
10 dB
0 dB 100 mV
Vout –10 dB
– 20 dB 10 mV
– 30 dB
1.0 mV
– 40 dB
316 mV
31.6 mV
10 mV
(Voltages are rms)
Expander
Vin
15 k
Vb
Gain
40 k Rectifier
Vout = 10 x Vin2
Vout
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
VCC Supply Voltage (Pin 16 – Pin 1)
High Input Voltage (Pins 3, 4, 8, 12, 14)
Low Input Voltage (Pins 3, 4, 8, 12, 14)
Output Source Current (Pins 2, 6, 10, 15)
VCC
VIH
VIL
IO+
– 0.5, +12
VCC + 0.5
– 0.5
Self-limiting
Vdc
Vdc
Vdc
mA
Output Sink Current (Pins 2, 6, 10, 15)
IO– Self-limiting mA
Storage Temperature
Tstg
– 65, +150
°C
NOTE: Devices should not be operated at these limits. The “Recommended Operating Conditions”
provides for actual device operation.
MOTOROLA
2
MC33111


Part Number MC33111
Description Low Voltage Compander
Maker Motorola
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MC33111 Datasheet PDF






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