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
Package
Pin Assignment
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
SOP-28B (MM1336CF, MM1336DF)
SOP-28B
1
3
6
10
2
4 5
8
7
12
9
11
14
13
28
24
21
27
25
23 22
20
26
15
17 16
18
19
1
COM1
15
VS
2
PIN1
16
C
3
PNF1
17
V
CC
2
4
PBU1
18
OUT2
5
POUT1
19
V
CC
1
6
IN1
20
RF
7
RECT
21
Pre OFF
8
AVNF
22
N/M
9
OUT1
23
IN2
10
COM2
24
POUT2
11
GND1
25
PBU2
12
GND2
26
PNF2
13
PCOUT
27
PIN2
14
PHASE
28
GND3
Item
Symbol
Ratings
Units
Operating temperature
T
OPR
-20~+65
C
Storage temperature
T
STG
-40~+125
C
Power supply current
V
CC
-0.3~+7.5
V
Power consumption
Pd
700
mW
Absolute Maximum Ratings
MITSUMI
IC for Headphone Stereos (with volume-limiting circuit) MM1336
Electrical Characteristics
(Except where noted otherwise, Vcc=3V, Ta=25
C, f=1kHz, R
L
1=10k
, R
L
2=16
)
Recommended Operating Conditions
Item
Symbol
Ratings
Units
Operating temperature
T
OPR
-20~65
C
Operating voltage
V
OPR
2.0~5.0
V
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
Consumption current
I
CC
V
IN
=0V, when motor is off
6
12
20
mA
Preamp unit
Open-circuit gain
Gvo
72
dB
Closed-circuit gain I
Normal
Gvc
Vo=-10dBm, f=1kHz
31
33.5
36
dB
Metal
29.5
32
34.5
Closed-circuit gain II
Normal
Gvc
Vo=-10dBm, f=5kHz
28
30.5
33
dB
Metal
23
25.5
28
Maximum output voltage
Vom
THD=10%
0.30
0.45
Vrms
Total harmonic distortion ratio
THD
V
OUT
=-10dBm
0.05
0.5
%
Output noise voltage
Normal
Vno
Rg=2.2k, BPF (400~30kHz)
30
75
150
Vrms
Metal
20
45
100
Crosstalk between channels
C T
Rg=2.2k
, V
OUT
=-10dBm
50
70
dB
Ripple rejection rate
RR
V
CC
=3V, V
R
=-20dBm, f
R
=100Hz, Rg=2.2k
45
55
dB
Output voltage with preamp off
Vooff
V
IN
=100mVrms, Pre off
-80
-60
dBm
ALC (off) + power amp
Voltage gain
Gv
P
OUT
=5mW
24
26
28
dB
Voltage gain difference between channels
GV
-2
0
2
dB
2CH
Maximum output current
Pom
THD=10% R
L
=16
30
50
mW
Total harmonic distortion ratio
THD
P
OUT
=5mW
0.5
1.5
%
Crosstalk between channels
C T
P
OUT
=5mW
35
45
dB
Output noise voltage
Vn
Rg=0
, BPF (400~30kHz)
85
200 Vrms
Ripple rejection rate
RR
V
CC
=3V, V
R
=-20dBm, f
R
=100Hz, Rg=0
35
45
dB
Input resistance
Ri
19
24
29
k
ALC (on) + power amp
Power amp output voltage
VOA
V
IN
=-40dBm
-34
-30
-26
dBm
ALC initiation input voltage
VINA
-56
dBm
ALC width
WALC
Input width for output
from start of up to +4dB
30
40
dB
ALC total harmonic distortion
THD
V
IN
=-40dBm
0.5
1.5
%
Noise of preamp+power amp+ALC
Vnto
Rg=2.2k
(preamp)
1.5
6
mVrms
MITSUMI
IC for Headphone Stereos (with volume-limiting circuit) MM1336
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
Motor control unit
Consumption current
Id
A2 measurement I
M
=0mA
1.5
3.5
mA
Startup current
IMS
At Rv=1.5
500
mA
Reference voltage
VS
At SW1=OFF, I
M
=100mA
0.09
0.10
0.11
V
VS fluctuation rate for V
CC
between
Reference voltage fluctuation I
VS1
1.8 and 3.5V with V
CC
=3.0 0.1
0.5
%/V
V as reference, I
M
=100mA
VS fluctuation rate for I
M
between
Reference voltage fluctuation II
VS2
25 and 200 mA with
0.005 0.05 %/mA
I
M
=100 mA as reference
VS fluctuation rate for Ta between
Reference voltage fluctuation III
VS3
-10 and 50
C with 0.01
%/
C
Ta=25
C as reference
Output saturation voltage
VoSAT
I
M
=200mA, V8 measurement, SW2=on
0.2
0.3
V
Bridge ratio
K
V7/ V6 measurement
9
10
11
K fluctuation rate for V
CC
between
Bridge ratio fluctuation I
K1
1.8 and 3.5V with
0.1
0.2
%/V
V
CC
=3V as reference
K fluctuation rate for I
M
between
Bridge ratio fluctuation II
K2
25 and 250mA with
0.05
0.2
%/mA
I
M
=100mA as reference
K fluctuation rate for Ta between
Bridge ratio fluctuation III
K3
-10 and 60
C with 0.01
%/
C
Ta=25
C as reference
Block Diagram
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