NJM2181 PRELIMINARY Passive Matrix TruSurroundTM 3D AUDIO PROCESSOR ■GENERAL DESCRIPTION The NJM2181 is a Passive Matrix TruSurroundTM 3D audio processor. It regenerates the full surround soundfield directly from any kinds of surround encoded stereo input (Lt/Rt) signals. After the internal passive matrix circuit decodes Lt/Rt signal into 4 channel signals, the TruSurround virtualizer reencodes them into 2 channel surround signals. Accordingly any pre-processors decoding into 4 channel signals are not required. The NJM2181 also includes SRS 3D Stereo and 3D Mono, and regenerates a 3D sound field from either normal L/R input or monoural input. The NJM2181 is suitable for TV, mini component, CD radio cassette, multimedia speaker system, and others. ■FEATURES ● Operating Voltage ● Maximum input Voltage ● Low Output Noise ● BYPASS Gain ● Passive Matrix TruSurround ● SRS 3D Stereo & 3D Mono ● BYPASS FUNCTION ● Bipolar Technology ● Package Outline ■PACKAGE OUTLINE NJM2181L NJM2181M (4.7 to 13V) (1.5Vrms typ. at TruSurround) (32µVrms typ. at TruSurround) (0dB typ.) (Two-grade Switch for 3D Effect) (Through) SDIP24, DMP24 The SRS, TruSurround technology right incorporated in the NJM2181 are owned by SRS Labs, a U.S. Corporation and licensed to New Japan Radio Co., Ltd. SRS, TruSurround is protected under U.S. and foreign patents issued and/or pending. SRS, TruSurround and the ,are trademarks of SRS Labs, Inc. in the United States and selected foreign countries. Neither the purchase of the NJM2181, nor the corresponding sale of audio enhancement equipment conveys the right to sell commercialized recordings made with any SRS technology. SRS Labs requires that all users of the NJM2181 must enter into a license agreement directly with SRS Labs if the royalty is not included in the purchase price. SRS Labs also requires any users to comply with all rules and regulations as outlined in the SRS Trademark Usage Manual. For further information, please contact: SRS Labs, Inc. 2909 Daimler Street. Santa Ana, CA 92705 USA Tel:714-442-1070 Fax:714-852-1099 http://www.srslabs.com -1- NJM2181 ■ABSOLUTE MAXIMUM RATING (Ta=25ºC) PARAMETER SYMBOL Supply Voltage V+ Power Dissipation PD Operating Temperature Range Topr Storage Temperature Range Tstg RATINGS UNIT 15 (SDIP24) 700 (DMP24) 700 -30 to +85 V mW ºC -40 to +125 ºC ■ELECTRICAL CHARACTERISTICS (Ta=25ºC,V+=9V, VIN =-10dBV(316mVrms)) TEST CONDITION PARAMETER Operating Voltage Supply Current Reference Voltage INPUT SYMBOL + V ICC VREF No Signal + V /2 f=1kHz THD=3% Maximum Input Voltage Channel Balance VIM CHBAL f=125Hz THD=3% f=125Hz THD=3% f=125Hz THD=3% f=1kHz THD=3% f=1kHz L-R OUT Rg=0Ω A-Weighted OutputNoise Voltage VNOISE Rg=0Ω A-Weighted Rg=0Ω A-Weighted f=1kHz Total Harmonic Distortion THD f=1kHz f=1kHz Bypass Gain -2- GVBYP f=1kHz MIN. TYP. MAX. UNIT 4.7 9.0 13.0 V 6.3 12.5 18.8 mA V L R OUT PUT - - - - - - - BYPASS - - - TRU - - - 3D Stereo1 - - - 3D Mono - - - - 4.3 4.5 4.7 VIN - L - VIN R BYPASS 6.8 (2.2) 8.8 (2.8) - VIN - L TRU VIN - R 3D Stereo1 VIN - R 3D Stereo2 VIN - L 3D Mono 1.5 (1.2) 3.6 (1.5) 3.6 (1.5) -7.6 (0.4) 3.5 (1.5) 5.6 (1.9) 5.6 (1.9) -3.0 (0.7) - VIN L VIN - R 3D Stereo1 -1.0 0.0 1.0 dB 0 0 TRU - 0 0 3D Stereo1 - 0 3D Mono - -90 (31.6) -90 (31.6) -90 (31.6) -85 (56.2) -85 (56.2) -85 (56.2) dBV (µVrms) 0 VIN - L R L R L R L - VIN R VIN - L - VIN R VIN - L - VIN R VIN - L - VIN R MODE TRU 0.10 3D Stereo1 0.10 3D Mono 0.10 BYPASS -1.0 0.0 - dBV (Vrms) - % 1.0 dB NJM2181 ■ELECTRICAL CHARACTERISTICS (Ta=25ºC,V+=9V, VIN =-10dBV(316mVrms)) TEST CONDITION PARAMETER MIN. TYP. MAX. TRU 0.2 2.2 4.2 TRU -13.5 -11.5 -9.5 3D Stereo1 -4.8 -2.8 -0.8 3D Stereo1 -15.0 -13.0 -11.0 3D Stereo2 -5.8 -3.8 -1.8 3D Stereo2 -21.0 -19.0 -17.0 3D Mono 1.3 -6.9 3.3 -4.9 5.3 -2.9 Vin=High Level 2.0 - V+ Vin=Low Level 0.0 - 0.7 SYMBOL INPUT f=1kHz f=1kHz f=1kHz SRS Gain f=1kHz GSRS f=1kHz f=1kHz f=1kHz Mode Select Control Voltage VMODE L R OUT PUT VIN - L - VIN R - VIN L VIN - R VIN - L - VIN R - VIN L VIN - R VIN - L - VIN R - VIN L VIN - R VIN VIN L VIN VIN R MODE UNIT dB V ■MODE SWITCH MODE MODE1 MODE2 MODE3 BYPASS L L - TRU L H - 3D Stereo1 H L L 3D Sterteo2 H L H 3D Mono H H - -3- NJM2181 ■PIN FUNCTION 24 23 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 1.FIL1 2.FIL2 3.FIL3 4.FIL4 5.FIL5 6.FIL6 7.FIL7 8FIL8 9.FIL9 10.MODE1 11.MODE2 12.MODE3 13 GND 14 VREFOUT 15 VREFIN 16 VCC 17 ROUT 18 LOUT 19 FIL10 20 FIL11 21 FIL12 22 FIL13 23 RIN 24 LIN ■BLOCK DIAGRAM INL 24 INR 23 FIL 13 22 FIL 12 21 FIL 11 20 FIL 10 19 OUTL OUTR 18 17 V+ 16 VREF IN 15 VREF OUT 14 GND 13 50K FILTER EXTERNAL 50K GND VREF EXTERNAL FILTER a MATRIX EXTERNAL FILTER a b c d MATRIX 1 2 3 4 5 FIL1 FIL2 FIL3 FIL4 FIL5 6 FIL6 7 8 FIL7 FIL8 a:BYPASS b:3D-STEREO c:TruSurround d:3D-MONO MATRIX 90° PHASE -4- b c d 9 10 11 12 FIL9 MODE MODE MODE 3 2 1 NJM2181 ■APPLICATION CIRCUIT GND 100uF/25V C13 GND C12 10uF/35V GND 100uF/25V VREF 10uF/35V GND 12V C14 V+ Rch OUTPUT 10uF/35V C15 Lch OUTPUT 0.22uF C18 0.0047uF C17 0.01uF C20 0.22uF GND C16 C19 10uF/35V C22 Lch INPUT 10uF/35V C21 Rch INPUT GND 16 V+ 15 14 MODE3 10K 13 GND 17 VREFOUT 18 VREFIN 19 ROUT 20 LOUT FIL13 LIN 21 FIL11 22 FIL12 23 RIN 24 FIL10 3D-2 R10 3D-1 10K MODE2 R9 NJM2181 10K FIL6 FIL7 FIL8 FIL9 MODE1 MODE2 MODE3 3 FIL5 2 FIL4 FIL2 1 FIL3 FIL1 MODE1 4 5 6 7 8 9 10 11 12 R8 0.0047uF GND GND 10uF/35V 10uF/35V C11 0.1uF C9 C8 C7 0.0047uF 10uF/35V C10 75K 51K C3 R7 33K R5 0.0047uF 1.5K C2 R6 0.01uF C1 R4 2MEG 0.22uF C6 C5 0.01uF R2 0.1uF C4 R3 1.8K R1 GND GND GND GND GND VREF [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. -5-