MITSMI MM1454 Datasheet

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

CC V

MITSUMI

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

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

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

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

µVrms

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