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.
16
1
P DIP 16 = EP
PLASTIC PACKAGE
CASE 648
The ML33111 will operate from a supply voltage of 3.0 V to 7.0 V, and
over a temperature range of T –40° to +85°C. It is designed to accommodate
A
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
SO 16 = -5P
PLASTIC PACKAGE
CASE 751B
• Operating Supply Voltage: 3.0 V to 7.0 V
(SO-16)
• Output Voltage Swing = 2.8 Vp-p with V
= 3.0 V
• No Precision External Components Required
CC
CROSS REFERENCE/ORDERING INFORMATION
• 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
PACKAGE
P DIP 16
SO 16
MOTOROLA
LANSDALE
ML33111EP
ML33111-5P
MC33111P
MC33111D
• Mute and passthrough Controls
• Two Uncommitted Op Amps
• Temperature Compensated Reference
• Available in Standard DIP and Surface Mount Packages
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
CM
EM
PT
Function
0
1
X
0
0
X
1
0
0
X
X
1
Normal
20 k
Expander
ML33111
Comp. Mute
Expander Mute
Passthrough
0.5
14
11
15 k
Expander
Input
Output
15
2
∆
Gain
40 k
1.0 µF
Vb
Rectifier
Compressor
Input
Compressor
Output
10 k
3
5
Vb
Gain
0.5
7.5 k
40 k
16
1
Bias &
Reference
Generator
V
∆
CC
1.0 µF
Rectifier
V+
10
9
4
12
8
Mute/
Passthrough
Logic
CM
EM
Vb
Vb
PT
7
6
Microphone
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