MITSUMI
IC for Headphone Stereos MM1104
IC for Headphone Stereos
Monolithic IC MM1104
Outline
This IC was developed for use in 3 V headphone stereos. It incorporates all the basic functions of tape
players.
Mitsumi has previously offered the LAG665, LAG668, LAG673 and MM1006 as one-chip versions. However,
this IC is the result of a through review and redesign extending to circuit details.
Features
1. Configuration: Pre-and power amp, motor control
2. Adoption of shock noise prevention circuitry
Through the use of a circuit which suppresses noise occurring when the power supply is turned on and off,
noise output is reduced without muting.
3. Stable motor speed control circuit
A bridge circuit employing power transistors provides motor speed control with minimal drift.
4. Preamp off pin is convenient for radio connections
5. Radiation pin: When radio wave-induced noise is a problem, this pin can be used to cut the frequency
characteristic.
Package
SOP-28B (MM1104AF, MM1104BF, MM1104CF)
Pin Assignment
1
2
3
4
5
28 27 26 25 24 23 22 21 20 19 18 17 16 15
6
7
1 2 3 4 5 6 7 8 9 10 11 12 13 14
SOP-28B
8
9
10
11
12
13
14
1/2V
CC
Pre
IN
1
NFB1
PreOUT1
Pre Off
Power
IN
1
Radiation1
PowerOUT1
GND
Governor V
CC
N.C
PCOUT
GND
Governor GND
15
16
17
18
19
20
21
22
23
24
25
26
27
28
N.C
Speed
Phase
V
S
PowerOUT2
Amp V
CC
Filter
Radiation2
Power
IN
2
N.C
PreOUT2
NFB2
Pre
IN
2
Amp GND
1
2
3
4
