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MM1077XF

Compander IC

Mitsumi 

MITSUMI

Compander IC MM1077

Electrical Characteristics (Except where noted otherwise, Ta=25°C, VCC=3V, fin=1kHz)

Item

Symbol Measurement conditions Min. Typ. Max. Units

Consumption current

ICC

No signal

4.0 6.0 mA

Standby current consumption Iscc

0 10 µA

Threshold voltage

Vth

0.40 0.65 0.80 V

Input reference level

VINc Voc=100mVrms, VIN=0dB 8.0 13.5 18.0 mVrms

* Gain error

Gc1

VIN=-20dB

-0.5 0 0.5 dB

Gc2

VIN=-40dB

-1.0 0 1.0 dB

Distortion

THDc

VIN=0dB

0.3 1.0 %

Compressor

unit

Output noise voltage

Mute attenuation

Limit voltage

Vnc

No signal (CCITT)

2.5 5.0 mVrms

Attc VIN=0dB, C.MUTE SW : ON 40 50

dB

Vlimc

THD=10%

700 800 900 mVp-p

DATA pin voltage gain

GDATA C. MUTE SW : ON, VIN=0dB -0.5 0 0.5 dB

DATA pin maximum output VD max. C.MUTE SW : ON, THD=10% 800 900

mVrms

Crosstalk

CTc

EXPVIN=0dB

28 33

dB

Ripple rejection ratio

RRc VR=100mVrms, fR=1kHz 18 23

dB

Input reference level

VINe Voe=100mVrms, VIN=0dB 25 35 50 mVrms

Ge1

VIN=-10dB

-0.5 0 0.5 dB

* Gain error difference

Ge2

Ge3

VIN=-20dB

VIN=-30dB

-1.0 0

-1.5 0

1.0 dB

1.5 dB

Distortion

THDe

VIN=0dB

0.15 1.0 %

Expander Maximum output voltage Ve max.

THD=10%

600 800

mVrms

unit

Output noise voltage

Vne

No signal (CCITT)

20 40 µVrms

Mute attenuation

Atte VIN=0dB, C. MUTE SW : ON 60 70

dB

Input amp voltage gain

GI

VIN=0dB

14.6 15.6 16.6 dB

Input amp maximum output Veo max.

THD=10%

0.90 1.10

Vrms

Crosstalk

CTe

COMPVIN=0dB

60 75

dB

Ripple rejection ratio

RRe VR=100mVrms, fR=1kHz 50 60

dB

*Gain error difference = (VOUT (dBv)+20dB) -VIN (dB) G (dB)

G : COMP=0.5, EXP=2

Function Description

1. Compressor unit

The compressor unit consists of the mike amp, compressor, limiter circuit, data amp, and mute circuit.

The mike amp gain can be adjusted through an external resistance, and so the mike amp can be

connected directly to a microphone. An internal limiter circuit to prevent overmodulation as well as a data

amp (0dB amp) enabling transmission of data signals without compression are also provided. Switching

between audio signals and data signals is possible using the compressor mute switch.

2. Expander unit

The expander unit consists of an input amp, expander, and mute circuit.

The input amp makes available all input and output signals at pins, and so can be used freely as an

amplifier, filter amp, or data amp. When used as a data amp, the expander mute switch can be set so that

the expander output is nearly silent.

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