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MITSUMI
Q Surround Processor MM1454
Q Surround Processor
Monolithic IC MM1454
Outline
This is an analog IC virtual surround processor that faithfully reproduces the sound algorithm developed by Q
SOUND Labs, Inc.
In particular, when a stereo signal (L/Rch) encoded by Dolby Pro Logic is input to this IC, a virtual rear speaker
is created spatially, and this allows reproduction of realistic, 3-dimensional sound from two speakers, without
the addition of another speaker.
Q Xpander technology allows deep, spatially wide sound for input of normal stereo signals, as well.
Virtual Dolby sound is a system developed by Dolby Labs, Inc. that reproduces realistic Pro Logic sound
*
with just two front left and right speakers, so there is no need for the additional two rear speakers and
center speaker normally required for Pro Logic sound.
Dolby and Dolby Surround are registered trademarks of Dolby Laboratory Licensing Corporation.
*
The Q Surround virtual processor (MM1454) was developed by Mitsumi Electric, and has not received the
*
certification or authorization of Dolby Laboratory.
Mitsumi Electric has no business ties or other relationship with Dolby Laboratory.
*
Features
1. Virtual rear speakers allow reproduction of 3-dimensional sound through only two speakers when a Pro
Logic encoded source is input.
2. Also reproduces wide sound for a normal stereo source.
3. 2ch input - 2ch output.
4. Few external parts due to use of the active filter created using Mitsumi's bipolar technology.
5. Low noise design Q Surround ON: 15µVrms
OFF: 10µVrms
6. Simple structure results in small size and low cost.
Package
SOP-16B
Applications
1. TV, VCR
2. Audio equipment
3. Computer monitors
4. Active speaker systems
Absolute Maximum Ratings
Item Symbol Rating Unit
Storage Temperature T
Operating Temperature T
Power Supply Voltage V
Input Voltage V
Output Voltage I
Allowable loss Pd 350 mW
(Ta=25°C)
STG
OPR
CC max. 13 V
IN max. 0
O max. 10 mA
-
40~+125 °C
-
20~+75 °C
<
<
IN
CC V
V
V
=
=
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Recommended Operating Conditions
Item Symbol Rating Unit
Q Surround Processor MM1454
Operating temperature T
Operating voltage V
Power supply fall times
Electrical Characteristics
Item Symbol Measurement Conditions Min. Typ. Max. Unit
Current consumption I
Voltage gain Q Surround 1 Gqs1 SG1 : 0.75Vrms, 1kHz SW2 : B TP1 8.5 9.5 10.5 dB
Voltage gain Q Surround 2 Gqs2 SG1 : 0.75Vrms, 1kHz SW2 : B TP2 4.0 5.0 6.0 dB
Voltage gain Q Surround 3 Gqs3 SG2 : 0.75Vrms, 1kHz SW3 : B TP2 8.5 9.5 10.5 dB
Voltage gain Q Surround 4 Gqs4 SG2 : 0.75Vrms, 1kHz SW3 : B TP1 4.0 5.0 6.0 dB
Voltage gain bias 1 Gby1
Voltage gain bias 2 Gby2
Input voltage amplitude (1) V
Input voltage amplitude (2) V
Total higher harmonic
distortion Q Surround
Total higher harmonic
distortion bias
Output noise voltage Q Surround
Output noise voltage bias Vnoby
R-L channel balance Cb
B/Q pin voltage (H) Vbyph
B/Q pin voltage (L) Vbyp1
B/Q pin voltage (H) Ibyph
B/Q pin voltage (L) Ibyp1
DET pin voltage (H)
DET pin voltage (L) Vdetl
Input resistance R
Power supply voltage
removal rate Q Surround
Power supply voltage
removal rate bias Vbyp=0V TP1, TP2
Crosstalk (1) Ct1
Crosstalk (2) Ct2
7 TVOFF 0.1~1.0 S
*
(Except where noted otherwise, VCC=9V, Ta=25°C, Vbyp=5V, SW1,2,3: A)
CC 16 22 mA
IN1VCC=9V
IN2VCC=9V
THDqs
THDby
Vnoqs BW=20~20kHz, A Curve TP1, TP2 15 35
Vdeth
IN TP3, TP4 21 30 39 kΩ
PSRRqx
PSRRby
OPR
OP 4.5~12.0 V
SG1 : 0.75Vrms, 1kHz Vbyp=0V
SG2 : 0.75Vrms, 1kHz Vbyp=0V
(a) SG1 : 0.75Vrms, 1kHz SW2 : B
(b) SG2 : 0.75Vrms, 1kHz SW3 : B TP1, TP2
(a) SG1 : 0.75Vrms, 1kHz SW2 : B
(b) SG2 : 0.75Vrms, 1kHz SW3 : B
BW=20~20kHz, A Curve
SG1, SG2 : 0.75Vrms, 1kHz
Vbyp=0V SW2, 3 : B TP1, TP2
*
*
SG3 : 100mVrms, 100Hz SW1 : B
SG3 : 100mVrms, 100Hz SW1 : B
SG1 : 0.75Vrms, 1kHz SW2 : B
*
SG2 : 0.75Vrms, 1kHz SW3 : B
*
-
20~+75 °C
SW2 : B TP1
SW3 : B TP2
1 SW2, 3 : B TP1, TP2 0.75 0.9 Vrms
*
2 SW2, 3 : B TP1, TP2 0.35 0.45 Vrms
*
Vbyp=0V
Vbyp=0V
3 2.1 V
*
4 0.7 V
5 Vbyp=5V TP5 350 µA
6 Vbyp=0V TP5
8 Vbyp=0V TP1, TP2
9 Vbyp=0V TP1, TP2
*
7 TP6 8.5 V
*
7 TP6 0.7 V
*
TP1, TP2
TP1, TP2
TP1, TP2
-
10 1dB
-
10 1dB
0.1 0.3 %
0.03 0.15 %
10 25
-
1.0 0 1.0 dB
-
1µA
-
80-65 dB
-
85-70 dB
-
85-70 dB
-
85-70 dB
µVrms
µVrms
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VCC=9V
Vdet 1
0V
Vdeth
V
CC waveform (16PIN)
DET pin waveform (4PIN)
Tvoff
Q Surround Processor MM1454
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
1 Input voltage amplitude when output total higher harmonic distortion is 1%. However, the signals
*
input to SG1 and SG2 must be the same phase (phase difference 0 degrees).
2 Input voltage amplitude when f = 1kHz and output total higher harmonic distortion is 1%. However,
*
the signals input to SG1 and SG2 must be reverse phase (phase difference 180 degrees).
3 Voltage when B/Q pin (Pin 3) is considered to be H (Q Surround mode).
*
4 Voltage when B/Q pin (Pin 3) is considered to be L (by pass mode).
*
5 Current that flows in to B/Q pin (Pin 3) when Vbyp = 5V.
*
6 Current that flows out of B/Q pin (Pin 3) when Vbyp = 0V.
*
7 The mute signal for turning off the power amp power supply is output to Pin 4. On this IC, it is
*
recommended that the pop noise generated during power supply fall be muted by turning off the
power amp connected to the final stage of MM1454 before turning off the IC power supply.
Note 8:
Note 9:
8 Defined as the ratio between Pin 6 output signal and Pin 7 output signal when a signal is input to
*
SG1.
9 Defined as the ratio between Pin 7 output signal and Pin 6 output signal when a signal is input to
*
SG2.
Block Diagram
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15.0
14.0
13.0
12.0
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.
100.010.0 1.0k 10.0k 100.0k
Frequency (Hz)
Voltage gain (dB)
Frequency (Hz)
10.0
8.0
6.0
4.0
2.0
0.
-
2.0
-
4.0
-
6.0
-
8.0
-
10.0
100.010.0 1.0k 10.0k 100.0k
Voltage gain (dB)
Application Circuit
Q Surround Processor MM1454
1 Resistor Tolerance ±1%
*
2 Capacitor Tolerance ±5%
*
3 The mute signal which switches off the power supply of a power amplifier that is connected with MM1454
*
appears in the 4 terminal. (NOTE 7)
4 The pop noise which occurs in a moment of the power supply switching on is reduced by connecting the
*
capacitor (10uF) between 2PIN and GND. But if the reduced pop noise cause trouble for your application, we
recommend muting the pop noise by the power amplifier that is connected with MM1454.
5 SW1: A QSurround Mode
*
SW2: B Bypass Mode
Characteristics
1. LIN-ROUT (RIN-LOUT) Frequency (Q Surround)
2. LIN-ROUT (RIN-ROUT) Frequency (Q Surround)
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Input Voltage (Vrms
)
0.01 0.1 1 10
10
1
0.1
0.01
THD
(
%
)
LIN-ROUT
LIN-LOUT
f=1kHz, RIN=0Vrms
Input Voltage (Vrms
)
0.01 0.1 1 10
10
f=1kHz, R
IN=0Vrms
1
0.1
0.01
THD
(
%
)
RIN-LOUT
RIN-ROUT
Input Voltage (Vrms
)
0.01
0.01
0.1 1 10
0.1
1
10
THD
(
%
)
LOUT
ROUT
Power supply voltage VCC
(V)
0 5 10 15
0
0.2
0.4
0.6
0.8
1
1.2
Input Voltage
(
1
) V
IN1(
Vrms
)
Power supply voltage VCC
(V)
0 5 10 15
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Input Voltage
(
2
)V
IN2 (
Vrms
)
Q Surround Processor MM1454
3. THD of output signal -Input voltage (LIN) (QSrround)
5. THD of output signal -Input voltage (QSrround)
f=1kHz, The signals that are inputted in L
IN
are out out of phase and same amplitude.
R
IN
and
4. THD of output signal -Input voltage (RIN) (QSrround)
6. Input voltage (1) -Power supply voltage (QSrround)
7. Input voltage (2) -Power supply voltage (QSrround)
See Electrical Characteristics Note 2
See Electrical Characteristics Note 1
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