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| NJU7087 PRELIMINARY Sound Enhancement Processor For Telephone sGENERAL DESCRIPTION The NJU7087 is a Sound Enhancement Processor for telephone, using a low power C-MOS technology. Sound enhancement and LPF circuit improve quality of conversation without increasing noise. The NJU7087 is suitable for limited band-width application, such as telephone, and answer phone. sPACKAGE OUTLINE sFEATURES qOperating Voltage qLow Operating Current qLow Output Noise qBypass Gain qAdjustable Boost Level(High) qPackage Outline sPIN CONFIGURATION NJU7087 (VDD=2.4 to 5.5V) (2mA typ.at VDD=3V) (31.6Vrms typ. at BBE ON) (0dB typ.) (SSOP16) VDD INPUT (NC) HPF CR1 BPF CR2 LPF GND VREF BBE OUTPUT CR5 CR4 BBEOUT CR3 No. 1 2 3 4 5 6 7 8 SYMBOL VDD INPUT (NC) HPF CR1 BPF CR2 LPF FUNCTION Power Supply Signal Input (No Connected) HPF Output Filter BPF Output Filter LPF Output No. 9 10 11 12 13 14 15 16 SYMBOL CR3 BBEOUT CR4 CR5 OUTPUT BBE VREF GND FUNCTION Filter BBE Output Filter Filter Signal Output BBE ON/OFF Reference Voltage GND sBLOCK DIAGRAM NJU7087 VDD HPF CR1 BPF CR2 LPF CR3 BBEOUT CR4 CR5 INPUT OUTPUT GND BBE VREF -1- NJU7087 sABSOLUTE MAXMUM RATINGS (Ta=25C) PARAMETER Supply Voltage Input Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL VDD VI PD Topr Tstg RATING 7.0 GND-0.5 to VDD+0.5 300 -40 to +85 -55 to +125 UNIT V V mW C C sELECTRICAL CHARACTERISTICS(VDD=3V,Vss=0V,Ta=25C) PARAMETER Operating Voltage Supply Current Reference Voltage BBE Terminal Input Current BBE Terminal Input Voltage Boost Level Maximum Input Voltage SYMBOL TEST CONDITION BBE - MIN. 2.4 0.8VDD GND TYP. 2.0 1.5 -1.0 4.0 MAX. 5.5 4.0 VDD 0.2VDD UNIT V mA V A V V dB VDD IDD VREF IBBE VBBEH VBBEL No Signal - BBE Terminal=3V - Boost VOMH VOML R1=24k,R3=56k,f=3kHz RL=50k RL=50k f=1kHz f=1kHz,Vin=0.1Vrms, Boost=4.0dB Input=GND,Boost=4.0dB, A-Weighting ON Bypass Bypass Bypass ON ON VDD -0.1 -1 - 0 0.1 -90 (31.6) Vss +0.1 1 -60 (100) V V dB % dBV (Vrms) Bypass Gain Total Harmonic Distortion Output Noise GBYP THD Vno sSWITCH FUNCTION Switch Terminal BBE Control Voltage Level High Low FUNCTION BYPASS BBE ON -2- NJU7087 sAPPLICATION CIRCUIT R1 10k to 24k C7 680p R4 56k DC3V + C1 10u C5 3300p C6 0.01u R2 100k R3 56k R5 56k C9 1500p VDD HPF CR1 BPF CR2 LPF CR3 BBEOUT CR4 CR5 C8 330p INPUT + C1 10u OUTPUT + C3 10u GND Bypass BBE BBE ON + VREF C4 10u VDD R1 10k 15k 24k Boost Level 12dB 8dB 4dB High Boost Level is adjusted by value of R1. Recommended High Boost Level : 4 to 12dB (R1 : 24k to 10k) sNOTE The NJU7087 is manufactured by New Japan Radio Co.,Ltd under license from BBE Sound Inc. BBE is a registered trademark of BBE Sound Inc. A license from BBE Sound Inc. is required before the NJU7087 can be purchased from New Japan Radio Co.,Ltd. BBE Sound, Inc. 5381 Production Drive Huntington Beach, CA 92649 Tel:(714)897-6766 Fax:(714)896-0736 -3- NJU7087 sTYPICAL CHARACTERISTICS Output Gain vs Freq. 15 +12dB 10 5 Gain (dB) +4dB bypass 0 -5 -10 -15 -20 20 100 1k Freq (Hz) 10k 20k Phase vs Freq. 720 630 540 Gain=+4dB Phase (deg) 450 360 270 180 90 0 20 100 1k Freq (Hz) Gain=+12dB 10k 20k [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. -4- |
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