NJM2708 Sound Enhancement Audio Processor for Compression Audio ■GENERAL DESCRIPTION ●PACKAGE OUTLINE The NJM2708 is a sound enhancement audio processor designed for compression audio. It includes mode control switch (sound enhancement mode / Bypass mode), standby function and realizes low consumption power design by standby function. It is suitable for portable audio, car audio & home audio applications. ■FEATURES ● Operating Voltage ● Low Operating Circuit NJM2708V +1.8 to +13 V 0.75 mA typ.(at Sound enhancement mode VR: Max.) 0.1µA typ. (at Standby mode) ● Low output noise -100dBV typ.(at Sound enhancement mode VR: Max.) ● Low THD 0.005% typ. ● Variable Surround Effect by external resistor ● Standby function ● Internal Mode Control Switch ● Bipolar Technology ● Package Outline SSOP14 ■PIN CONFIGURATION 1 14 2 13 3 12 4 11 5 10 6 9 7 8 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. STANDBY SW LIN RIN MODE SW VREF GND NC DNC V+ NFR NFL ROUT LOUT NC (SSOP14) Ver.0.1E –1– NJM2708 ■BLOCK DIAGRAM (SSOP14) STBY SW 1 14 BIAS NC BYPASS LIN 2 REBIRTH FILTER 13 LOUT 12 ROUT BYPASS RIN 3 REBIRTH FILTER MODE SW 4 11 NFL VREF 5 10 NFR V+ –2– GND 6 9 V+ NC 7 8 DNC NJM2708 ■ABSOLUTE MAXIMUM RATING (Ta=25°C) PARAMETER SYMBOL RATING UNIT 14 400 V Power Supply Voltage V+ Power Dissipation PD NOTE: EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR-4) mounting Operating Temperature Range Topr -40 ~ +85 °C Storage Temperature Range Tstg -40 ~ +125 °C mW ■OPERATING VOLTAGE PARAMETER Operating Voltage SYMBOL TEST CONDITION V+ MIN. TYP. MAX. UNIT 1.8 9.0 13 V MIN TYP MAX ■ELECTRICAL CHARACTERISTICS (Ta=25°C, V+=9V, unless otherwise specified) TEST CONDITION PARAMETER Supply Current Reference Voltage SYMBOL ICC VREF INPUT No Signal No Signal OUTPUT Mode VR UNIT L R 0 0 - Active - - 750 1300 0 0 - Standby - - 0.1 1.0 Max - 750 1300 - 3.65 4.15 4.65 V UNIT 0 0 - eala Rebirth 0 0 - - µA ■AC CHARACTERISTICS (Ta=25°C, V+=9V, Vin= 1.5Vrms,f=1kHz,RL=10kΩ,unless otherwise specified) TEST CONDITION PARAMETER Maximum Input Voltage Output Noise Total Harmonic Distortion SYMBOL INPUT OUTPUT L R f=1kHz THD=1% VIN - L - VIN R f=1kHz THD=1% VIN - L - VIN R f=10kHz THD=1% VIN - L - VIN R f=10kHz THD=1% VIN - L - VIN R 0 0 VIM Rg=0Ω A-Weighted VNO Rg=0Ω A-Weighted L R L 0 0 VIN=1.5Vrms f=1kHz VIN - L - VIN R VIN=0.75Vrms f=10kHz VIN - L - VIN R THD+N R MIN TYP MAX - 2.2 3.0 - MAX 1.5 2.7 - Mode VR Bypass eala Rebirth Vrms Bypass - 2.2 3.0 - eala Rebirth MAX 1.0 1.6 - Bypass - - -112 (2.5) -106 (5.0) eala Rebirth MAX - -100 (10) -94 (20) Bypass - - 0.002 0.01 dBV (µVrms) % eala Rebirth MAX - 0.1 - –3– NJM2708 TEST CONDITION PARAMETER SYMBOL INPUT L R OUTPUT Bypass Gain GVBYP VIN=1.5Vrms f=1kHz VIN - L - VIN R eala Rebirth Gain Geala VIN=0.75Vrms f=10kHz VIN - L - VIN R MIN TYP MAX UNIT - -1.0 0.0 1.0 dB MAX 3.0 5.0 7.0 dB Mode VR Bypass eala Rebirth ■CONTROL CHARACTERISTICS (Ta=25°C, V+=9V, unless otherwise specified) PARAMETER Mode Select Control Voltage SYMBOL VMODE TEST CONDITION –4– MAX. V V - V VIN=Low Level 0.0 - 0.3 SW L, open H NOTES Input Through eala Rebirth(Stereo Input) SW L, open H NOTES IC is non-active IC is active UNIT + 1.2 STANDBY SW MODE Standby Active TYP. VIN=High Level ■SWITCH FUNCTION MODE SW MODE Bypass eala Rebirth MIN. NJM2708 ■ APPLICATION CIRCUIT 1 STANDBY SW 2 LIN NC 14 10uF+ Lch Input + 10uF LOUT 13 10uF+ Rch Input + 1uF + 10uF 3 100kΩ + 10uF Lch Output RIN ROUT 12 Rch Output 2.2nF 4 MODE SW NFL 11 5 VREF NFR 10 6 GND V+ MAX MIN 9 100uF 7 NC DNC VR:10kΩ 22kΩ + +9V 8 –5– NJM2708 ■ TERMINAL DESCRIPTION + (Ta=25°C, V =9V) PIN No. SYMBOL FUNCTION EQUIVALENT CIRCUIT V+ STANDBY SW V+ Standby Switch 700 0V 75k 225k 1 Voltage V+ LIN RIN Lch Input Rch Input V+ 4.15V 700 100k 2 3 V+ VREF V+ 4 MODE SW V+ V+ Mode Control Switch 0V 300k 700 V+ V+ 300k V+ VREF Reference Voltage 4.15V 300k 5 –6– NJM2708 ■ TERMINAL DESCRIPTION + (Ta=25°C, V =9V) PIN No. SYMBOL FUNCTION 7 14 NC No Connect - 8 DNC Do Not Connect - 9 V+ Power Supply V+ EQUIVALENT CIRCUIT V+ 20k V+ Voltage 10 11 NFR NFL Rch Filter Terminal Lch Filter Terminal 4.15V 400 12 13 ROUT LOUT Rch Output Lch Output V+ 20k V+ V+ 12k V+ 4.15V –7– NJM2708 [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. –8–