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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: 15Vrms OFF: 10Vrms 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 Storage Temperature Operating Temperature Power Supply Voltage Input Voltage Output Voltage Allowable loss (Ta=25C) Symbol TSTG TOPR VCC max. VIN max. IO max. Pd Rating -40~+125 -20~+75 13 < < 0 = VIN = VCC 10 350 Unit C C V V mA mW MITSUMI Q Surround Processor MM1454 Recommended Operating Conditions Item Operating temperature Operating voltage Power supply fall times *7 Symbol TOPR VOP TVOFF Rating -20~+75 4.5~12.0 0.1~1.0 Unit C V S Electrical Characteristics Item Current consumption Voltage gain Q Surround 1 Voltage gain Q Surround 2 Voltage gain Q Surround 3 Voltage gain Q Surround 4 Voltage gain bias 1 Voltage gain bias 2 Input voltage amplitude (1) Input voltage amplitude (2) Total higher harmonic distortion Q Surround Total higher harmonic distortion bias Output noise voltage Q Surround Output noise voltage bias R-L channel balance B/Q pin voltage (H) B/Q pin voltage (L) B/Q pin voltage (H) B/Q pin voltage (L) DET pin voltage (H) DET pin voltage (L) Input resistance Power supply voltage removal rate Q Surround Power supply voltage removal rate bias Crosstalk (1) Crosstalk (2) (Except where noted otherwise, VCC=9V, Ta=25C, Vbyp=5V, SW1,2,3: A) Measurement Conditions SG1 : 0.75Vrms, 1kHz SW2 : B SG1 : 0.75Vrms, 1kHz SW2 : B SG2 : 0.75Vrms, 1kHz SW3 : B SG2 : 0.75Vrms, 1kHz SW3 : B SG1 : 0.75Vrms, 1kHz SW2 : B SG2 : 0.75Vrms, 1kHz SW3 : B VCC=9V *1 SW2, 3 : B VCC=9V *2 SW2, 3 : B (a) SG1 : 0.75Vrms, 1kHz SW2 : B (b) SG2 : 0.75Vrms, 1kHz SW3 : B (a) SG1 : 0.75Vrms, 1kHz SW2 : B (b) SG2 : 0.75Vrms, 1kHz SW3 : B Vbyp=0V BW=20~20kHz, A Curve BW=20~20kHz, A Curve Vbyp=0V SG1, SG2 : 0.75Vrms, 1kHz Vbyp=0V SW2, 3 : B *3 *4 *5 Vbyp=5V *6 Vbyp=0V *7 *7 TP1 TP2 TP2 TP1 Vbyp=0V TP1 Vbyp=0V TP2 TP1, TP2 TP1, TP2 TP1, TP2 Min. Typ. Max. Unit 16 22 mA 8.5 9.5 10.5 dB 4.0 5.0 6.0 dB 8.5 9.5 10.5 dB 4.0 5.0 6.0 dB -1 -1 0.75 0.35 0 0 0.9 0.45 0.1 0.3 1 1 dB dB Vrms Vrms % Symbol ICC Gqs1 Gqs2 Gqs3 Gqs4 Gby1 Gby2 VIN1 VIN2 THDqs THDby Vnoqs Vnoby Cb Vbyph Vbyp1 Ibyph Ibyp1 Vdeth Vdetl RIN PSRRqx PSRRby Ct1 Ct2 0.03 TP1, TP2 TP1, TP2 TP1, TP2 TP1, TP2 -1.0 2.1 TP5 TP5 TP6 TP6 TP3, TP4 15 10 0 0.15 35 25 1.0 % Vrms Vrms dB V V A A V V k dB dB dB dB 0.7 350 -1 8.5 21 30 -80 -85 -85 -85 0.7 39 -65 -70 -70 -70 SG3 : 100mVrms, 100Hz SW1 : B TP1, TP2 SG3 : 100mVrms, 100Hz SW1 : B Vbyp=0V TP1, TP2 SG1 : 0.75Vrms, 1kHz SW2 : B TP1, TP2 *8 Vbyp=0V SG2 : 0.75Vrms, 1kHz SW3 : B TP1, TP2 *9 Vbyp=0V MITSUMI Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Q Surround Processor MM1454 *1 *2 *3 *4 *5 *6 *7 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). 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). Voltage when B/Q pin (Pin 3) is considered to be H (Q Surround mode). Voltage when B/Q pin (Pin 3) is considered to be L (by pass mode). Current that flows in to B/Q pin (Pin 3) when Vbyp = 5V. Current that flows out of B/Q pin (Pin 3) when Vbyp = 0V. 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. Tvoff VCC=9V VCC waveform (16PIN) 0V Vdeth DET pin waveform (4PIN) Vdet 1 Note 8: Defined as the ratio between Pin 6 output signal and Pin 7 output signal when a signal is input to SG1. Note 9: *9 Defined as the ratio between Pin 7 output signal and Pin 6 output signal when a signal is input to SG2. *8 Block Diagram MITSUMI Q Surround Processor MM1454 Application Circuit *1 Resistor Tolerance 1% Capacitor Tolerance 5% *2 The mute signal which switches off the power supply of a power amplifier that is connected with MM1454 3 * appears in the 4 terminal. (NOTE 7) which occurs in a moment of is reduced by *4 The pop noisebetween 2PIN and GND. But ifthe power supply switching on trouble for yourconnecting the capacitor (10uF) the reduced pop noise cause 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) 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. 10.0 10.0 8.0 6.0 4.0 2.0 0. -2.0 -4.0 -6.0 -8.0 -10.0 10.0 Voltage gain (dB) 100.0 1.0k 10.0k 100.0k Voltage gain (dB) 100.0 1.0k 10.0k 100.0k Frequency (Hz) Frequency (Hz) MITSUMI Q Surround Processor MM1454 3. THD of output signal - Input voltage (LIN) (QSrround) 4. THD of output signal - Input voltage (RIN) (QSrround) 10 f=1kHz, RIN=0Vrms 10 f=1kHz, RIN=0Vrms THD(%) 1 LIN-ROUT 0.1 0.01 0.01 LIN-LOUT THD(%) 1 RIN-ROUT 0.1 0.01 0.01 RIN-LOUT 0.1 1 10 0.1 1 10 Input Voltage (Vrms) Input Voltage (Vrms) 10 Input Voltage (1) VIN1(Vrms) 5. THD of output signal - Input voltage (QSrround) 6. Input voltage (1) - Power supply voltage (QSrround) f=1kHz, The signals that are inputted in LIN and RIN are out out of phase and same amplitude. 1.2 1 0.8 0.6 0.4 0.2 0 0 5 10 15 THD(%) 1 ROUT 0.1 LOUT 0.01 0.01 0.1 1 10 Power supply voltage VCC (V) See Electrical Characteristics Note 1 Input Voltage (Vrms) 7. Input voltage (2) - Power supply voltage (QSrround) Input Voltage (2)VIN2 (Vrms) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 5 10 15 Power supply voltage VCC (V) See Electrical Characteristics Note 2 |
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