MITSMI MM1077XF Datasheet

MITSUMI

Compander IC MM1077

Compander IC

Monolithic IC MM1077

Features

This IC was developed for use in cordless telephone equipment. It is a compander IC incorporating compressor/expander circuits for a significant noise reduction effect without complicated external circuitry. On the transmission side, the dynamic range of audio signals is compressed by the compressor circuit; on the receiving side, the expander expands the signals. As a result the dynamic range over the transmission channel is reduced logarithmically by one-half.

1. Can be driven at low voltages (down to 2.0V)

2. Internal mute function

3. Internal limiter (IDC) function

4. Compressor input can be switched between MIC and LINE

5. Internal standby function

6. Data input, output pins

7. Independent mute circuit

Package

SSOP-24A (MM1077XF)

Pin Assignment

SSOP-24A

136924587101211

24 20 1723 21 19 18 1622 131415

Applications

1. Cordless telephones

2. Various mobile communication devices

1 C.Vref 9 DATA. IN 17 E.RECT

2 C.IN1 10 C.CONT 18 E.OUT

3 C.IN2 11 N.C 19 E.RIN

4 C.IN

12 GND 20 A.OUT

5 C.RECT 13 STANDBY SW 21 A.IN

6 C.RIN 14 C.IN SW 22 A.IN+

7 C.FB 15 C.MUTE SW 23 E.Vref

8 C.NF 16 E.MUTE SW 24 Vcc

Outline

MITSUMI

Compander IC MM1077

Block Diagram

Absolute Maximum Ratings

(Ta=25°C)

Item Symbol Ratings Units

Storage temperature T

STG

40~+125

Operating temperature T

OPR

10~+70

Power supply voltage V

CC max.

0.3~+8 V

Allowable loss Pd 650 mW

Operating voltage +2.0~+7 V

MITSUMI

Compander IC MM1077

Electrical Characteristics

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

Function Description

Item Symbol Measurement conditions Min. Typ. Max. Units

Consumption current I

CC 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 V

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

mVrms

Gain error

Gc1 VIN=-20dB

0.5 0 0.5 dB

Gc2 V

IN=

40dB

1.0 0 1.0 dB

Distortion THDc V

IN=0dB 0.3 1.0 %

Output noise voltage Vnc No signal (CCITT) 2.5 5.0

mVrms

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

Limit voltage Vlimc THD=10% 700 800 900

p-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 V

R=100mVrms, fR=1kHz 18 23 dB

Input reference level V

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

mVrms

Ge1 VIN=-10dB

0.5 0 0.5 dB

Gain error difference

Ge2 VIN=-20dB

1.0 0 1.0 dB

Ge3 V

IN=

30dB

1.5 0 1.5 dB

Distortion THDe V

IN=0dB 0.15 1.0 %

Maximum output voltage

Ve max.

THD=10% 600 800

mVrms

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 V

IN=0dB 14.6 15.6 16.6 dB

Input amp maximum output

Veo max.

THD=10% 0.90 1.10 Vrms

Crosstalk CTe COMPV

IN=0dB 60 75 dB

Ripple rejection ratio RRe V

R=100mVrms, fR=1kHz 50 60 dB

Compressor

unit

Expander

unit

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.

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

G : COMP=0.5, EXP=2

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