NJM2703 3D SURROUND AUDIO PROCESSOR FOR HEADPHONE ■ GENERAL DESCRIPTION The NJM2703 is a high quality 3D surround audio processor designed for headphone applications. It includes mode control switch (Surround mode / Bypass mode). The NJM2703 features low operating voltage, low operating current, low output noise and very small package, and is suitable for any portable audio applications. ■ PACKAGE OUTLINE NJM2703RB2 ■ FEATURES ● Operating Voltage 1.8 to 6V ● Low Operating Current 0.45mA typ. (at Surround mode, VR: max.) ● Low Output Noise 10µV typ. (at Surround mode, VR: max.) ● Variable Surround Effect by external resistor ● Internal Mode Control Switch ● Bipolar Technology ● Package Outline TVSP10 ■ PIN CONFIGURATION 1 10 2 9 3 8 4 7 5 6 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. LIN RIN SW VREF GND V+ NFR NFL ROUT LOUT ■ BLOCK DIAGRAM + LIN LOUT + 3D FILTER RIN - ROUT + Bypass Surround Mode -1- NJM2703 ■ABSOLUTE MAXIMUM RATING (Ta=25°C) PARAMETER SYMBOL RATINGS UNIT 7 V + Supply Voltage V Power Dissipation PD 320 mW Operating Temperature Range Topr -20 to +75 °C Storage Temperature Range Tstg -40 to +125 °C ■OPERATING VOLTAGE PARAMETER Operating Voltage SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT V+ - 1.8 3.0 6.0 V MIN. TYP. MAX. UNIT ■ELECTRICAL CHARACTERISTICS (V+=3V, Ta=25°C unless otherwise specified) TEST CONDITION PARAMETER Operating Current Reference Voltage SYMBOL INPUT ICC OUTPUT MODE VR L R 0 0 - Bypass - - 0.45 0.7 0 0 - Surround MAX - 0.45 0.7 0 0 - - - 1.0 1.15 1.3 V MIN. TYP. MAX. UNIT No Signal Vref No Signal mA ●AC CHARACTERISTICS (V+=3V, Ta=25°C, VIN=-20dBV(100mVrms), f=1kHz, RL=10kΩ, unless otherwise specified) TEST CONDITION PARAMETER Maximum Input Voltage SYMBOL VIM INPUT Total Harmonic Distortion -2- VNO MODE VR L R f=1kHz T.H.D.=1% VIN 0 0 VIN L R Bypass - - -2.0 (790) - f=100Hz T.H.D.=1% VIN 0 0 VIN L R Surround MAX - -16.0 (160) - VIN 0 0 VIN L R Bypass - -10.5 (300) -8.5 (380) - VIN 0 0 VIN L R Surround MAX -24.5 (60) -22.5 (75) - Rg=0Ω A-Weighted 0 0 L R Bypass - - -112 (2.5) -106 (5.0) Rg=0Ω A-Weighted 0 0 L R Surround MAX - -100 (10) -94 (20) f=1kHz VIN 0 0 VIN L R Bypass - - 0.02 0.05 f=1kHz VIN 0 0 VIN L R V+=1.8V f=1kHz T.H.D.=1% V+=1.8V f=100Hz T.H.D.=1% Output Noise OUTPUT T.H.D dBV (mVrms) dBV (µVrms) % Surround MAX - 0.1 0.5 NJM2703 ●AC CHARACTERISTICS (V+=3V, Ta=25°C, VIN=-20dBV(100mVrms), f=1kHz, RL=10kΩ, unless otherwise specified) TEST CONDITION PARAMETER SYMBOL Bypass Gain INPUT MODE VR MIN. TYP. MAX. UNIT dB L R f=1kHz VIN 0 0 VIN L R Bypass - -1.0 0.0 1.0 f=100Hz VIN 0 0 VIN L R Surround MAX 12.5 14.5 16.5 f=100Hz 0 VIN VIN 0 L R Surround MAX 10.5 12.5 14.5 f=100Hz VIN 0 0 VIN L R Surround MIN 0.5 2.5 4.5 MIN. TYP. MAX. GVBYP Surround Gain OUTPUT GVSUR dB ●CONTROL CHARACTERISTICS (V+=3V, Ta=25°C unless otherwise specified) TEST CONDITION PARAMETER Mode Select Control Voltage SYMBOL INPUT VIN= High Level VIN= Low Level VMODE L R - - OUTPUT MODE VR - - - 1.2 - V+ - 0.0 - 0.3 UNIT V - - - - ■MODE SWITCH MODE SW Bypass Surround L, open H NOTES Input Through Surround Mode (Stereo Input) -3- NJM2703 ■TERMINAL DESCRIPTION PIN NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT V+ LIN RIN Rch Input Lch Input V+ 1.15V 700 100k 1 2 V+ VOLTAGE VREF V+ 3 SW V+ V+ Mode control switch 0V 300k 700 VREF Reference voltage 5 GND GND V+ 1.15V 300k 4 V+ 300k V+ -4- 0V NJM2703 PIN NO. SYMBOL FUNCTION 5 V+ Power Supply EQUIVALENT CIRCUIT VOLTAGE V+ V+ 20k V+ 7 8 NFL NFR Filter terminal Filter terminal 1.15V 400 9 10 ROUT LOUT Rch Output Lch Output V+ 20k V+ V+ 12k V+ 1.15V -5- NJM2703 ■APPLICATION CIRCUIT 10µ Rch IN 10µ SW 1 LIN LOUT 10 2 RIN ROUT 9 3 SW NFL 8 4 VREF NFR 7 Lch OUT 10µ 0.0033µ Lch IN 1µ 1µ 5 GND V+ 6 0.0033µ 100k Rch OUT 10µ MAX MIN VR 50kB 100µ V+(3V) -6- 4.7k NJM2703 Supply Current vs. Supply Voltage Supply Current vs. Ambient Temperature Ta=25degrees V+=3V 0.7 0.7 0.6 0.6 0.5 0.5 Supply Current [mA] Supply Current [mA] ■TYPICAL CHARACTERISTICS Surround BYPASS 0.4 0.3 0.2 0.1 0.1 0 1 2 3 4 5 6 0 -50 7 0 25 50 75 100 125 Ambient Temperature [degrees] Reference Voltage vs. Supply Voltage Reference Voltage vs. Ambient Temperature Ta=25degrees V+=3V 1.3 3 1.25 Reference Voltage [V] 2.5 2 1.5 1 1.2 1.15 1.1 1.05 0.5 0 0 1 2 3 4 5 6 1 -50 7 -25 0 25 50 75 100 125 Supply Voltage [V] Ambient Temperature [degrees] Maximum Input Voltage vs. Supply Voltage (BYPASS) Maximum Input Voltage vs. Supply Voltage (Surround) Vin=Lch f=1kHz Vout=Lch RL=10kohm THD=1% Ta=25degrees Vin=Lch f=100Hz Vout=Lch RL=10kohm VR=MAX THD=1% Ta=25degrees 10 -5 5 -10 Maximum Input Voltage [dBV] Maximum Input Voltage [dBV] -25 Supply Voltage [V] 3.5 Reference Voltage [V] 0.3 0.2 0 BYPASS Surround 0.4 0 -5 -10 -15 -20 -25 -15 -30 0 1 2 3 4 Supply Voltage [V] 5 6 7 0 1 2 3 4 5 6 7 Supply Voltage [V] -7- NJM2703 ■TYPICAL CHARACTERISTICS Maximum Input Voltage vs. Ambient Temperature (Surround) V+=3V Vin=Lch f=1kHz Vout=Lch RL=10kohm THD=1% V+=3V Vin=Lch f=100Hz Vout=Lch RL=10kohm VR=MAX THD=1% 0 -15 -1 -16 Maximum Input Voltage [dBV] Maximum Input Voltage [dBV] Maximum Input Voltage vs. Ambient Temperature (BYPASS) -2 -3 -4 -5 -50 -17 -18 -19 -25 0 25 50 75 100 -20 -50 125 0 25 50 75 100 125 Maximum Input Voltage vs. Ambient Temperature (BYPASS) Maximum Input Voltage vs. Ambient Temperature (Surround) V+=1.8V Vin=Lch f=1kHz Vout=Lch RL=10kohm THD=1% V+=1.8V Vin=Lch f=100Hz Vout=Lch RL=10kohm VR=MAX THD=1% -5 -20 -6 -21 Maximum Input Voltage [dBV] Maximum Input Voltage [dBV] Ambient Temperature [degrees] -7 -8 -9 -10 -50 -22 -23 -24 -25 0 25 50 75 100 -25 -50 125 0 25 50 75 100 125 Ambient Temperature [degrees] Output Noise Voltage vs. Ambient Temperature Output Noise Voltage vs. Ambient Temperature V+=3V Rg=0ohm Vout=Rch VR=MAX FILTER=A-Weighted -90 -90 -95 -95 Output Noise Voltage [dBV] Output Noise Voltage [dBV] -25 Ambient Temperature [degrees] V+=3V Rg=0ohm Vout=Lch VR=MAX FILTER=A-Weighted -100 Surround -105 -110 BYPASS -115 -120 -50 -100 Surround -105 -110 BYPASS -115 -25 0 25 50 75 Ambient Temperature [degrees] -8- -25 Ambient Temperature [degrees] 100 125 -120 -50 -25 0 25 50 75 Ambient Temperature [degrees] 100 125 NJM2703 ■TYPICAL CHARACTERISTICS Total Harmonic Distortion vs. Input Voltage (BYPASS) Total Harmonic Distortion vs. Input Voltage (Surround) V+=3V Vin=Lch f=1kHz Vout=Lch RL=10kohm BW=10Hz to 80kHz V+=3V Vin=Lch f=100Hz Vout=Lch RL=10kohm BW=10Hz to 80kHz VR=MAX 10 10 1 THD+N [%] THD+N [%] 1 Ta=75deg. Ta=25deg. Ta=-20deg. 0.1 Ta=75deg. Ta=25deg. Ta=-20deg. 0.1 0.01 0.001 -50 -40 -30 -20 -10 0 0.01 -50 10 -40 Input Voltage [dBV] -30 -20 -10 0 Input Voltage [dBV] Voltage Gain vs. Frequency (BYPASS) Voltage Gain vs. Frequency (Surround) V+=3V Vin=-20dBV Lch Vout=Lch RL=10kohm Rg=25ohm V+=3V Vin=-20dBV Lch Vout=Lch RL=10kohm Rg=25ohm VR=MAX 1 20 Ta=75deg. Ta=25deg. Ta=-20deg. 15 0.5 Voltage Gain [dB] Voltage Gain [dB] Ta=-20deg. Ta=25deg. Ta=75deg. 0 10 5 -0.5 0 -1 10 100 1000 10 4 10 -5 5 10 100 Frequency [Hz] 10 4 10 5 10 5 Frequency [Hz] Voltage Gain vs. Frequency (Surround) Voltage Gain vs. Frequency (Surround) V+=3V Vin=-20dBV Rch Vout=Lch RL=10kohm Rg=25ohm VR=MAX V+=3V Vin=-20dBV Lch Vout=Lch RL=10kohm Rg=25ohm VR=MIN 15 20 Ta=75deg. Ta=25deg. Ta=-20deg. 15 Voltage Gain [dB] 10 Voltage Gain [dB] 1000 5 0 -5 10 Ta=75deg. Ta=25deg. Ta=-20deg. 5 0 -10 10 100 1000 Frequency [Hz] 10 4 10 5 -5 10 100 1000 10 4 Frequency [Hz] -9- NJM2703 ■TYPICAL CHARACTERISTICS Voltage Gain vs. SW Terminal Input Voltage Output DC Offset Voltage vs. Ambient Temperature V+=3V Vin=-20dBV Lch f=100Hz Vout=Lch VR=MAX BYPASS to Surround V+=3V BYPASS to Surround 10 20 Output DC Offset Voltage [mV] Voltage Gain [dB] 15 10 Ta=75deg. Ta=25deg. Ta=-20deg. 5 0 -5 0 0.5 1 1.5 SW Terminal Input Voltage [V] 2 5 Lch 0 Rch -5 -10 -50 -25 0 25 50 75 100 125 Ambient Temperature [degrees] [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. - 10 -