ML33111
Low Voltage Compander
Silicon Monolithic Integrated Circuit
Legacy Device:
Motorola MC33111
The ML33111 contains two variable gain circuits configured for compress-
ing and expanding the dynamic range of an audio signal. One circuit is config-
ured 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 tempera-
ture stable bandgap reference provides the necessary precision voltages.
Included in the ML33111 are controls for muting each section independ-
ently, and for pass through of both. Two uncommitted op amps are available
for peripheral functions.
The ML33111 will operate from a supply voltage of 3.0 V to 7.0 V and
,
over a temperature range of TA –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.
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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
16
1
P DIP 16 = EP
PLASTIC PACKAGE
CASE 648
16
1
SO 16 = -5P
PLASTIC PACKAGE
CASE 751B
(SO-16)
CROSS REFERENCE/ORDERING INFORMATION
PACKAGE
MOTOROLA
LANSDALE
P DIP 16
MC33111P
ML33111EP
SO 16
MC33111D
ML33111-5P
Note:
Lansdale lead free (Pb) product, as it
becomes available, will be identified by a part
number prefix change from
ML
to
MLE.
TRUTH TABLE
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
4
12
8
VCC
∆
Gain
Vb
Compressor
2 Output
Expander
15 Output
CM
0
1
X
0
EM
0
X
1
0
PT
0
X
X
1
Function
Normal
Comp. Mute
Expander Mute
Passthrough
Expander
Input
0.5 14
11
ML33111
1.0
µF
Compressor
3
Input
0.5
1.0
µF
V+
Vb
CM
EM
PT
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