MITSMI MM1102XF Datasheet
MITSUMI
Compander IC MM1102
Compander IC
Monolithic IC MM1102
Features
This IC was developed for use in cordless telephones. 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 2.4V)
2. Internal mute function
3. Internal limiter (IDC) function
4. Two internal op-amps (for splatter filter)
5. Internal standby function
6. Data input, output pins
7. Independent mute circuit
Package
SSOP-24A (MM1102XF)
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 C.OUT 17 E.MUTE SW
2 C.IN 10 BUFIN 1 18 E.OUT
3 C.IN
-
11 BUFOUT 1 19 E.RECT
4 C.RECT 12 GND 20 A.OUT
5 C.RIN 13 BUFIN 2 21 A.IN
-
6 C.FB 14 BUFOUT 2 22 A.IN+
7 C.NF 15 STANDBY SW 23 E.Vref
8 DATA IN 16 C.MUTE SW 24 V
CC
MITSUMI
Compander IC MM1102
Block Diagram
MITSUMI
Compander IC MM1102
Pin Description
Pin no. DC voltage
I/O resistance
Function Equivalent circuit
Regulator output
1PIN···C.Vref
23PIN···E.Vref
Mike amp unit
Mike amp input stage
Rectifier circuit unit
Attack and release times
determined
5 1.5V 15kΩ
Rectifier circuit unit
Input pin
6 1.5V
-
7 1.5V 10kΩ
Compressor amp unit
6PIN···Output pin
7PIN···Feedback resistance
8 1.5V 100kΩ
9 1.5V
-
Inverting amp (0dB)
8PIN···Input pin
9PIN···Output pin
1 1.5V
-
23 1.3V
-
2 1.5V 100kΩ
3 1.5V 2.2kΩ
4
-
10kΩ
19
-
10kΩ
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