MITSUMI
IC for Headphone Stereos (with volume-limiting circuit) MM1336
IC for Headphone Stereos (with volume-limiting circuit)
Monolithic IC MM1336
Outline
This IC was developed for use in 3V headphone stereos. In addition to the basic functions required by
headphone stereos, it incorporates a circuit for limiting volume. In some parts of Europe hearing impairment
caused by the high volumes of headphone stereos has become a problem, and there has been strong
demand for functions for limiting loud volumes in the sets themselves. This trend is expected to gain
momentum in the U.S. as well.
This IC uses an internal ALC circuit to suppress headphone stereo output, avoiding the above problem.
Features
1. Configuration: Pre-and power amps, ALC circuit, motor control
2. Internal tape selector: A selector switch allows the user to select between normal and metal tapes.
3. Internal OCL circuit: There is no need for a capacitor for high-volume output, so sets can be kept thin.
4. With preamp off pin while connected to radio
5. Designed for low shock noise
Reduced noise occuring when the power supply is turned on and off
Package
SOP-28B (MM1336CF, MM1336DF)
Pin Assignment
1
2
3
4
5
6
7
8
9
10
11
12
13
14
COM1
PIN1
PNF1
PBU1
POUT1
IN1
RECT
AVNF
OUT1
COM2
GND1
GND2
PCOUT
PHASE
15
16
17
18
19
20
21
22
23
24
25
26
27
28
VS
C
V
CC
2
OUT2
V
CC
1
RF
Pre OFF
N/M
IN2
POUT2
PBU2
PNF2
PIN2
GND3
28 27 26 25 24 23 22 21 20 19 18 17 16 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14
SOP-28B
Absolute Maximum Ratings
Item
Operating temperature
Storage temperature
Power supply current
Power consumption
Symbol
T
OPR
T
STG
V
CC
Pd
Ratings
-20~+65
-40~+125
-0.3~+7.5
700
Units
擄
C
擄
C
V
mW
MITSUMI
1
2
3
