MITSUMI
Bass Amplifier MM1124
Bass Amplifier
Monolithic IC MM1124
Outline
This IC was developed to boost bass on TV and free-standing VCR decks, etc.
The recent trend toward large-screen TV and movie software has increased the demand for powerful bass
and wider sound, so that the bass boost function has become part of TV and VCR functions.
This IC was designed especially for bass, and easily reproduces a powerful sound.
Features
1. Dynamic bass boost
Boost can be adjusted higher for lower sound, and smaller for bigger sound.
2. Boost switching pin
Boost amount can be switched for music and video software, giving a change to the set
3. High range boost
By boosting the high range as well, a more realistic sound is reproduced
4. Boost attack circuit
Gives quick response and follows sudden volume changes
Series Table
Model name
Boost
Boost start
FULL
1/2
input level
MM1124A
19dB
14dB
+3dBm
MM1124B
12dB
8dB
+3dBm
MM1124C
8dB
4dB
-14dBm
Note 1 : Boost amounts for are input level of -37.8dBm
Note 2 : The above are reference values, and may vary depending on the
specifications.
Absolute Maximum Ratings
(Ta=25
C)
Item
Symbol
Ratings
Units
Storage temperature
T
STG
-40~+125
C
Operating temperature
T
OPR
-20~+70
C
Power supply voltage
V
CC
max.
-0.3~+15
V
Operating voltage
V
CC
+5~+12
V
Allowable loss
Pd
350 (SOP-16B)
1200 (DIP-16B)
mW
Package
SOP-16B (MM1124AF, MM1124BF, MM1124CF)
DIP-16B (MM1124AD, MM1124BD)
MITSUMI
Bass Amplifier MM1124
Electrical Characteristics
(Ta=25
C)
Item
Rank
Measurement conditions
Min. Typ. Max. Units
SW
f (Hz)
V
IN
(dBm)
Consumption current
FULL
1k
-7.8
6.6
9.0
mA
Voltage gain
Through
1k
-7.8
-1
0
+1
dB
A
FULL
100
-37.8
17
19
21
dB
Boost 1 (Bst1)
B
FULL
100
-37.8
10
12
14
dB
C
FULL
100
-37.8
6
8
10
dB
A
1/2
100
-37.8
Bst1-6 Bst1-5 Bst1-4
dB
Boost 2
B
1/2
100
-37.8
Bst1-5 Bst1-4 Bst1-3
dB
C
1/2
100
-37.8
Bst1-5 Bst1-4 Bst1-3
dB
FULL
1k
-7.8
0.1
0.3
%
Total harmonic distortion ratio
1/2
1k
-7.8
0.1
0.3
%
Through
1k
-7.8
0.03
0.1
%
Crosstalk
FULL
1k
-7.8
-50
-44
dB
Maximum output voltage
FULL
THD=10%
1.8
2.4
Vrms
Output noise voltage
FULL
V
IN
=0V, 30kHzLPF
250
500
Vrms
Through
Rg=10k
25
50
Vrms
A
FULL
-32
-26
dB
Through
-48
-42
dB
Ripple rejection rate
B
FULL
-36
-30
dB
Through
-48
-42
dB
C
FULL
-42
-34
dB
Through
-56
-48
dB
FULL
1k
-7.8
0
0.3
V
SW pin voltage range
1/2
1k
-7.8
1.2
1.6
V
Through
1k
-7.8
2.5
9
V
Superimpose VR=0dB
(100Hz, 100mVrms) on
V
CC
and measure output
pin
Note : No rank indication means common rank
MITSUMI
Bass Amplifier MM1124
Block Diagram/ Application Circuits
Characteristics
Boost amount-Input level (rank A)
Input level (dB)
20
15
10
5
0
-5
-10
-50
-40
-30
-20
-10
0
10
SW:FULL
SW:1/2
Boost amount (dB)
Output level-Frequency (rank A) SW : FULL
10
1
10
2
10
3
10
4
10
5
-40
-30
-20
-10
0
10
-2.2dBm
-7.8dBm
-37.8dBm
Frequency (Hz)
Output level (dBm)
MITSUMI
Bass Amplifier MM1124
Boost amount-Input level (rank B)
Input level (dB)
20
15
10
5
0
-5
-10
-50
-40
-30
-20
-10
0
10
SW:FULL
SW:1/2
Boost amount (dB)
Output level-Frequency (rank B) SW : FULL
10
1
10
2
10
3
10
4
10
5
-40
-30
-20
-10
0
10
-2.2dBm
-7.8dBm
-37.8dBm
Frequency (Hz)
Output level (dBm)
Boost amount-Input level (rank C)
Input level (dB)
20
15
10
5
0
-5
-10
-50
-40
-30
-20
-10
0
10
SW:FULL
SW:1/2
Boost amount (dB)
Output level-Frequency (rank C) SW : FULL
10
1
10
2
10
3
10
4
10
5
-40
-30
-20
-10
0
10
-2.2dBm
-7.8dBm
-37.8dBm
Frequency (Hz)
Output level (dBm)
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