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Issue A

LANSDALE Semiconductor, Inc.

ML33111

PIN FUNCTION DESCRIPTION

Name

Pin

Description

Ground

1

Connect to a clean power supply ground.

Compressor Output

2

Output of the compressor section.

Compressor Input

3

Compressor input. The input impedance is nominally 10 k

Ω. 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

4

A logic high mutes the compressor. A logic low permits normal operation and passthrough.

Compressor Filter

5

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

6, 7

Inverting input (7) and output (6) of an op amp internally referenced to Vb.

Passthrough

8

A logic high sets the gain of both expander and compressor to

≈ 0 dB, independent of

input level.

Amplifier #2

9, 10

Inverting input (9) and output (10) of an op amp internally referenced to Vb.

Expander Filter

11

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

12

A logic high mutes the expander. A logic low permits normal operation and passthrough.

No Connect

13

This pin is not internally connected to anything.

Expander Input

14

Expander input. The input impedance is nominally 10.9 k

Ω. 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

Output of the expander section.

VCC

16

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

Vb

15 k

Rectifier

40 k

∆ Gain

Vout

Vin

Vout = 10 x Vin2

Expander

Compressor

Vb

Rectifier

∆ Gain

Vin

Vout

10 k

Compression

Expansion

20 dB

10 dB

0 dB

–10 dB

– 20 dB

– 30 dB

– 40 dB

10 mV

31.6 mV

316 mV

1.0 V

100 mV

10 mV

1.0 mV

(Voltages are rms)

Vout

0.3162 x Vin

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

VCC Supply Voltage (Pin 16 – Pin 1)

VCC

– 0.5, +12

Vdc

High Input Voltage (Pins 3, 4, 8, 12, 14)

VIH

VCC + 0.5

Vdc

Low Input Voltage (Pins 3, 4, 8, 12, 14)

VIL

– 0.5

Vdc

Output Source Current (Pins 2, 6, 10, 15)

IO+

Self-limiting

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.