Motorola MC33111D, MC33111P Datasheet

MOTOROLA

SEMICONDUCTOR

TECHNICAL DATA

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.

Order this data sheet by MC33111/D

MC33111

LOW VOLTAGE

COMPANDER

SILICON MONOLITHIC
INTEGRATED CIRCUIT

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 V

with VCC = 3.0 V

p-p

• 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

MC33111

0.5

1.0

1.0

µ

0.5

µ

14
11

F

10 k

3

Vb

∆

5

F

10

Vb

9

Gain

Rectifier

Expander
Input

Compressor
Input

V+

Microphone

This document contains information on a new product. Specifications and information herein are subject to change
without notice. This device contains 329 active transistors.

40 k

Vb

15 k

Rectifier

7.5 k

40 k

∆

67

Gain

20 k

Vb

Bias &

Reference

Generator

Mute/

Passthrough

Logic

Expander
Output

15

Compressor
Output

2

16

V

CC

1

4
12
8

CM
EM

PT

16

1

P SUFFIX

PLASTIC PACKAGE

CASE 648

16

1

D SUFFIX

PLASTIC PACKAGE

CASE 751B

(SO-16)

TRUTH TABLE

CM PT Function

EM

0

0

1

X

X

1

0

0

0
X
X
1

Normal

Comp. Mute

Expander Mute

Passthrough

ORDERING INFORMATION

Temperature

Device

MC33111D
MC33111P

Range

–40° to + 85°C

Package

Plastic DIP

 Motorola, Inc. 1994

SO-16

PIN FUNCTION DESCRIPTION

Name Pin Description

Ground 1
Compressor Output 2

Compressor Input 3

Compressor Mute 4
Compressor Filter 5

Amplifier #1 6, 7
Passthrough 8

Amplifier #2 9, 10
Expander Filter 11

Expander Mute 12
No Connect 13
Expander Input 14

Expander Output 15
V

CC

16

Connect to a clean power supply ground.
Output of the compressor section.

Compressor input. The input impedance is nominally 10 kΩ. Nominal signal range is

1.0 mVrms to 1.0 V rms 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 kΩ. Nominal signal range is

10 mVrms to 316 mV rms 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.

TRANSFER FUNCTIONS

Compressor

Rectifier

∆

Gain

V

V

in

V

out

10 k

+

0.3162 x V

Vb

Ǹ

in

out

MAXIMUM RATINGS

Rating Symbol Value Unit

VCC Supply Voltage (Pin 16 – Pin 1) V
High Input Voltage (Pins 3, 4, 8, 12, 14) V
Low Input Voltage (Pins 3, 4, 8, 12, 14) V
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 T

NOTE: Devices should not be operated at these limits. The “Recommended Operating Conditions”

provides for actual device operation.

Compression Expansion

1.0 V

20 dB
10 dB

0 dB

–10 dB

– 20 dB
– 30 dB

– 40 dB

100 mV

10 mV

1.0 mV

316 mV

31.6 mV
10 mV

(Voltages are rms)

CC

IH
IL

stg

–0.5, +12 Vdc

VCC + 0.5 Vdc

– 0.5 Vdc

– 65, +150 °C

Expander

V

in

∆

Gain

Rectifier

V

out

Vb

= 10 x V

2

in

15 k

40 k

V

out

MOTOROLA MC33111
2

RECOMMENDED OPERATING CONDITIONS

Characteristic Symbol Min Typ Max Unit

VCC Supply Voltage V
Input Signal Voltage Range (3.0 V < VCC < 7.0 V) V

Compressor — Normal and Mute Mode 0 — 1.3 Vrms

— Passthrough Mode 0 — 0.8

Expander — Normal Mode 0 — 0.32

— Mute Mode 0 — 1.3

— Passthrough Mode 0 — 1.0
Frequency Range (± 1.0 dB accuracy) Fin 0.300 — 10 kHz
Logic Input Voltage Range (Pins 4, 8, 12) V
Operating Ambient Temperature T

NOTE: All limits are not necessarily functional concurrently.

ELECTRICAL CHARACTERISTICS (V

Characteristic Symbol Min Typ Max Unit

COMPRESSOR (Pin 4 = Low unless noted)

0 dB Gain (Vin = 100 mVrms) G
Gain tracking relative to G

Vin = 1.0 Vrms 9.0 10 11

Vin = 1.0 mVrms –21 –20 –19
Passthrough Gain (Pin 8 = High, Pin 4 = Low, Vin = 1.0 Vrms) G
Muting (∆ Gain) with Pin 4 = High (Vin = 1.0 Vrms) G
Max. Output Swing @ Pin 2 (3.0 V < VCC < 7.0 V) V

Normal Mode — 1.1 —

Passthrough Mode — 2.3 —
Peak Output Current (3.0 ≤ VCC ≤ 7.0 V, Normal or Passthrough Modes,

Vin = Max)
Total Harmonic Distoration (Vin = 100 mVrms) THD — 0.2 1.0 %
Power Supply Rejection @ 1.0 KHz PSRR dB

Vin (Pin 3) = 0 — 37 —

Vin (Pin 3) = 10 mVrms — 64 —

Vin (Pin 3) = 1.0 Vrms — 72 —
Attack Time (Capacitor @ Pin 5 = 1.0 µF, per EIA-553)

Decay Time (Capacitor @ Pin 5 = 1.0 µF, per EIA-553)
Input Impedance at Pin 3 Rin 8.0 10 14 kΩ
DC Bias Level (Pin 2)

Output DC Shift (Vin Changed from 0 to 100 mVrms)

OC

= 3.6 V, f = 1.0 kHz, TA = + 25°C, unless noted.)

CC

CC

in

in
A

OC

G

TC

PTC
MTC

out

I

PK

t

AT(C)
t

D(C)

Vb

IAS

3.0 — 7.0 Vdc

0 — V

–40 — +85 °C

–1.5 0 1.5 dB

– 2.0 0 1.0 dB

55 67 — dB

— ± 4.0 — mA

—
—

1.4

–20

3.0
14

Vb

1.6

CC

—
—

1.6

2.0

mVdc

Vdc

dB

V

p-p

ms

Vdc

EXPANDER (Pin 12 = Low, unless noted)

0 dB Gain (Vin = 100 mVrms) G
Gain Tracking Relative to G

Vin = 316 mVrms 19 20 21

Vin = 10 mVrms –41 –40 –39
Passthrough Gain (Pin 8 = High, Pin 12 = Low, Vin = 1.0 Vrms) G
Muting (∆ Gain) with Pin 12 = High (Vin = 0.316 Vrms) G
Max. Output Swing @ Pin 15 (3.0 V < VCC , 7.0 V) V

Normal Mode — 2.8 —

Passthrough Mode — 2.8 —
Peak Output Current I

VCC = 3.0 V, V

VCC = 3.0 V, V

VCC ≥ 3.6 V, V
Total Harmonic Distoration (Vin = 100 mVrms) THD — 0.2 1.0 %

out
out

out

≤ 2.4 V
= 2.7 V

≤ 2.8 V

OE

p-p
p-p

p-p

G

PTE
MTE

out

PK

OE
TE

–1.5 0 1.5 dB

–1.0 0 2.0 dB

60 76 — dB

— ± 3.5 —
— ±1.0 —

— ± 4.0 —

MOTOROLAMC33111

V

dB

p-p

mA

3

ELECTRICAL CHARACTERISTICS (V

Characteristic UnitMaxTypMinSymbol

EXPANDER (Pin 12 = Low, unless noted)

Power Supply Rejection @ 1.0 kHz PSRR dB

Vin (Pin 14) = 0 — 74 —
Vin (Pin 14) = 10 mVrms — 76 —

Vin (Pin 14) = 316 mVrms — 62 —

Attack Time (Capacitor @ Pin 11 = 1.0 µF, per EIA-553)
Decay Time (Capacitor @ Pin 11 = 1.0 µF, per EIA-553)

Input Impedance at Pin 14 R
DC Bias Level (Pin 15)

Output DC Shift (Vin changed from 0 to 100 mVrms)

LOGIC INPUTS (Pins 4, 8, 12)

Switching Threshold (3.0 < VCC < 7.0 V) V
Input Current Rin µA

@ Vin = 0 V — 0 —
@ Vin = 3.6 V — 55 —

Timing (Vin @ Pins 3 and 14 = 300 mVrms, See Figures 1, 2) µs

Comp. Mute (Pin 4) to Comp. Output Low-to-High t

Exp. Mute (Pin 12) to Exp. Output Low-to-High t

Passthrough (Pin 8) to Comp. Output Low-to-High t

Passthrough (Pin 8) to Exp. Output Low-to-High t

OP AMPS (Pins 6, 7, 9, 10)

Open Loop Gain A
Gain Bandwidth BW — 300 — kHz
Input Bias Current @ Pins 7, 9 I
Max Output Swing @ Pins 6, 10 (3.0 V < VCC < 7.0 V) V
Peak Output Current I

VCC = 3.0 V, V
VCC = 3.0 V, V

VCC ≥ 3.6 V, V

Total Harmonic Distoration (V

MISCELLANEOUS

Power Supply Current I

@ VCC = 3.6 V — 1.5 2.0
@ VCC = 7.0 V — 1.7 —

Reference Voltage Vb — 1.5 — Vdc
Channel Separation CS dB

Expander to Compressor

(Pin 14 = 316 mVrms @ 1.0 kHz and Pin 3 = 0 mVrms) 40 70 —
(Pin 14 = 100 mVrms (300 Hz < f < 20 kHz),

Pin 3 = 100 mVrms @ 1.2 kHz) — 96 —

Compressor to Expander

(Pin 3 = 1.0 Vrms @ 1.0 kHz and Pin 14 = 0 mVrms) 60 100 —
(Pin 3 = 100 mVrms (300 Hz < f < 20 kHz),

Pin 14 = 100 mVrms @ 1.2 kHz) — 97 —

out
out

out

≤ 2.4 V
= 2.6 V

≤ 2.8 V

p-p
p-p

p-p

= 1.0 Vrms, Unity Gain) THD — 0.02 0.2 %

out

= 3.6 V, f = 1.0 kHz, TA = + 25°C, unless noted.)

CC

t

AT(E)
t

D(E)

in

Vb

IAS

ST

High-to-Low t

High-to-Low t

High-to-Low t

High-to-Low t

CMLH
CMHL
EMLH

EMHL

PCLH
PCHL
PELH

PEHL

VOL

IB
out

PK

CC

—
—

8.0 10.9 14 kΩ

1.4

–20

— 1.3 — Vdc

— 2.0 —
— 3.0 —
— 2.0 —

— 3.0 —
— 2.0 —

— 5.0 —
— 6.0 —

— 7.0 —

— 100 — dB

— 8.0 — nA
— 2.8 — V

— ± 3.0 —
— ± 2.0 —

— ± 3.7 —

3.0
14

Vb

1.0

—
—

1.6
20

mVdc

ms

Vdc

p-p

mA

mA

MOTOROLA MC33111
4