ML33111
LANSDALE Semiconductor, Inc.
PIN FUNCTION DESCRIPTION
Name
Pin
1
Description
Ground
Connect to a clean power supply ground.
Output of the compressor section.
Compressor Output
Compressor Input
2
3
Compressor input. The input impedance is nominally 10 kΩ. 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.
Compressor Mute
Compressor Filter
4
5
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.
Amplifier #1
Passthrough
6, 7
8
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.
Amplifier #2
9, 10
11
Inverting input (9) and output (10) of an op amp internally referenced to Vb.
Expander Filter
Connect an external capacitor to filter the full wave rectifier’s output.
This capacitor affects attack and decay times, and low frequency accuracy.
Expander Mute
No Connect
12
13
14
A logic high mutes the expander. A logic low permits normal operation and passthrough.
This pin is not internally connected to anything.
Expander Input
Expander input. The input impedance is nominally 10.9 kΩ. 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.
Expander Output
15
16
Output of the expander section.
V
CC
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.
TRANSFER FUNCTIONS
Compressor
Compression
Expansion
Expander
1.0 V
Rectifier
20 dB
V
in
316 mV
V
out
10 dB
Vb
∆
Gain
10 k
15 k
40 k
100 mV
0 dB
∆
Gain
V
31.6 mV
10 mV
out
V
in
–10 dB
Vb
10 mV
– 20 dB
Rectifier
– 30 dB
1.0 mV
V
0.3162 x
V
out
– 40 dB
in
2
V
= 10 x V
in
out
(Voltages are rms)
MAXIMUM RATINGS
Rating
Supply Voltage (Pin 16 – Pin 1)
Symbol
Value
Unit
Vdc
Vdc
Vdc
mA
mA
°C
V
CC
V
CC
–0.5, +12
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)
Output Sink Current (Pins 2, 6, 10, 15)
Storage Temperature
V
IH
V
+ 0.5
CC
– 0.5
V
IL
IO+
IO–
Self-limiting
Self-limiting
– 65, +150
T
stg
NOTE: Devices should not be operated at these limits. The “Recommended Operating Conditions”
provides for actual device operation.
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