Sound Enhancement Processor For Telephone
NJU7087
PRELIMINARY
Sound Enhancement Processor For Telephone
sGENERAL DESCRIPTION The NJU7087 is a Sound Enhancement P...
Description
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) (31.6µVrms 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=25°C) 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=25°C) PARAMETER Operating Voltage Supply Current Referen...
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