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| NJM2776 Headphone Amplifier for Portable Audio s GENERAL DESCRIPTION The NJM2776 is a low voltage headphone amplifier for portable audio applications. The NJM2776 operates directly for one battery supply with + + independent power supply terminals (V 1 and V 2). Also it provides shock-noise less standby mode. The NJM2776 is suitable for portable MD, portable CD and others. s PACKAGE OUTLINE NJM2776RB2 s FEATURES q Operating Voltage V 1(from step-up converter) =1.8 to 4.5V (however, V 1 > V 2) + + + V 2(from battery) =0.9 to 4.5V (however, V 1 > V 2) + + + q Low Operating Current ICC4(V 1 side)=200A typ. (V 1=2.3V, V 2=1.2V, No signal) + + + ICC3(V 2 side)=350A typ. (V 1=2.3V, V 2=1.2V, No signal) + + + q Supply Current in Standby mode ICC2(V 1 side)=25A typ. (V 1=2.3V, V 2=1.2V) + + + ICC1(V 2 side)= 6A typ. (V 1=2.3V, V 2=1.2V) q Output Power Exceeds PO=8.5mW typ. (RL=16, THD=10%) q Shock-noise less Standby mode q Bipolar Technology q Package Outline TVSP10 + + + s PIN CONFIGURATION AND BLOCK DIAGRAM V +2 1 10 GND OUT 1 2 9 OUT 2 + - - + IN 1 3 8 IN 2 STANDBY TC 4 BIAS 7 STANDBY 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. V2 OUT1 IN1 STADBY_TC + V1 VREF STANDBY IN2 OUT2 GND + REG V +1 5 VREF AMP 6 VREF -1- NJM2776 s ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL + Supply Voltage V Power Dissipation PD Operating Temperature range Topr Storage Temperature Range Tstg RATINGS 5 (note) 320 -20 to +75 -40 to +125 UNIT V mW C C s RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL TEST CONDITION + V1 Operating Voltage Range + V2 + + MIN. 1.8 0.9 TYP. 2.3 1.2 MAX. 4.5 4.5 UNIT V s ELECTRICAL CHARACTERISTICS (Ta=25C, V 1=2.3V, V 2=1.2V, VIN=-30dBV (31.6mVrms), f=1kHz, RL=16, Active mode, unless otherwise specified) Power Supply TEST CONDITION PARAMETER SYMBOL MIN. TYP. MAX. UNIT pin + + Operating Current ICC0 V 1=0V V2 1.0 + ICC1 V2 6.0 10.0 Standby mode + A ICC2 V1 25 35 + ICC3 V2 350 750 No signal + ICC4 V1 200 400 + ICC5 V2 2.5 PO=0.1mW+0.1mW mA + 200 V1 ICC6 Reference Voltage No signal 0.50 0.60 0.65 V VR E F Amplifier PARAMETER Closed loop Gain Output Power Total Harmonic Distortion Output Noise Voltage Channel Separation Mute Level Supply Voltage Rejection Ratio SYMBOL GV PO THD V NO CS MUTE PSRR1 PSRR2 Mode Control PARAMETER High Level Input Voltage Low Level Input Voltage Standby mode 1kHz Band Pass + V 1=1.8V + 0.1Vrms + V 2=0.9V + V 1=1.8V + V 2=0.9V + 0.1Vrms TEST CONDITION V IN =High Level V IN =Low Level TEST CONDITION THD=10% P O =1mW A-Weighted MIN. 10.0 5.0 44 46 70 TYP. 11.5 8.5 0.20 -100 (10.0) MAX. 12.5 0.50 -96 (15.8) UNIT dB mW % dBV (V) 55 -100 52 77 -80 - dB dB dB - SYMBOL V IH V IL MIN. 1.2 0.0 TYP. - MAX. + V1 0.3 UNIT V s MODE SWITHCH FUNCTION STANDBY (7PIN) PARAMETER CONTROL SIGNAL Standby L, open Active H STATUS IC is non-active. IC is active. -2- NJM2776 s TERMINAL DESCRIPTION PIN No. SYMBOL EQUIVALENT CIRCUIT V+2 VOLTAGE NOTE 2,9 OUT1, OUT2 5K VREF 15K OUT 0.6V GND V+1 3,8 IN1, IN2 IN 20K VREF GND 0.6V V+1 4 STANDBY_TC 400 88k 680 STANDBY_TC 1.2V GND V+2 V+1 100 6 VREF VREF 0.6V GND -3- NJM2776 PIN No. SYMBOL EQUIVALENT CIRCUIT V+1 VOLTAGE NOTE 680 7 STANDBY STANDBY 120k - 300k GND -4- NJM2776 s APPLICATION CIRCUIT V +2 C1 22F C2 330F GND C10 330F OUT 1 OUT 2 C9 0.22F IN 2 C8 0.47F V +1 Active STANDBY Standby R2 10 R1 C3 10 0.22F IN 1 C4 0.47F STANDBY TC C5 0.33F V +1 C6 22F VREF C7 22F Note) Recommended the capacitors C1, C3, C6 and C9 are featuring higher frequency efficiency to prevent the oscillation. -5- NJM2776 s APPLICATION NOTE 1. Procedure for Supplying Power + + Supply the power to first V 2(Battery side) and then V 1(Step-up Converter side). 2. Input Dynamic Voltage Range The reference voltage is fixed at 0.6V. Therefore input dynamic voltage range is not proportion to the power supply voltage. The input signal over dynamic range makes distortion. For prevent the distortion, adjust the maximum input signal level. 3. Charge Sequence Pop noise may not be happened with mode switch operation once output voltage becomes reference voltage. The "Charge Sequence" may shorter the time for power up initialization. Charge Sequence: To set mode switch from standby to active during power up initialization, activate rapid charge circuit for stabilizing the output voltage. -6- NJM2776 s TYPICAL CHARACTERISTICS Operating Current vs. Operating Voltage V 2=1.2V, Ta=25 oC, Active 2000 1000 + Operating Current vs. Operating Voltage V+1=2.3V, Ta=25o C, Active 800 1500 Operating Current [ A] Operating Current [ A] 600 1000 V +2 V2 400 + V1 200 + 500 V1 + 0 0 1 2 3 + 4 5 6 0 0 0.5 1 1.5 + 2 2.5 Operating Voltage(V 1) [V] Operating Voltage (V 2) [V] Operating Current vs. Operating Voltage V 2=1.2V, Ta=25 C, Standby 50 + o Operating Current vs. Operating Voltage V+1=2.3V, Ta=25o C, Standby 25 40 Operating Current [ A] Operating Current [ A] 20 V+1 30 V1 + 15 20 10 V+2 5 10 V2 + 0 0 1 2 3 4 5 6 0 0 0.5 1 1.5 2 2.5 Operating Voltage (V+1) [V] Operating Voltage (V+2) [V] Operating Current vs. Temperature V 1=2.3V, V 2=1.2V, Active 600 + + Operating Current vs. Temperature V 1=2.3V, V 2=1.2V, Standby 40 35 30 + + 500 V1 + Operating Current [ A] 400 V+2 300 Operating Current [mA] 25 20 15 10 5 200 V1 100 + V2 + 0 -50 0 50 100 150 0 -50 0 50 Ta [ C] o 100 150 Ta [ C] o -7- NJM2776 s TYPICAL CHARACTERISTICS Reference Voltage vs. Operating Voltage V+1=2.3V, Ta=25o C 1 700 600 0.8 Reference Voltage [mV] Reference Voltage [V] 500 400 300 200 100 0 0 -50 Reference Voltage vs. Temperature V+1=2.3V, V +2=1.2V 0.6 0.4 0.2 0 0.5 1 1.5 + 2 2.5 0 50 Ta [ C] o 100 150 Operating Voltage (V 2) [V] Total Harmonic Distortion vs. Output Power V+1=2.3V, V +2=1.2V, f=1KHz, RL=16, BW=400Hz-30kHz Total Harmonic Distortion vs. Output Power V 1=2.3V, V 2=1.2V, RL=16, Ta=25 oC BW f=10kHz:400-80kHz f= 1kHz:400-80kHz f=100Hz: 10-30kHz + + 10 Ta=-20oC Ta=25o C THD+N [%] THD+N [%] 1 Ta=75oC 10 1 f=10kHz 0.1 0.1 f=100Hz f=1kHz 0.01 0.001 0.01 0.1 1 10 0.01 0.001 0.01 0.1 1 10 Output Power [mW] Output Power [mW] Output Power vs. Operating Voltage V 1=2.3V, f=1kHz, THD=10%, RL=16, BW=400-30kHz 14 12 Ta=25oC 10 Output Power [mW] 8 6 4 2 0 0.5 Ta=-20 C Ta=75oC o + Power Dissipation vs. Output Power V +1=2.3V, V +2=1.2V, f=1kHz, RL=16, BW=30kHz, Ta=25oC 50 40 Operating Current [mW] THD=10% 30 20 10 1 1.5 2 + 2.5 3 0 0 2 4 6 8 10 Operating Voltage (V 2) [V] Output Power [mW/ch] -8- NJM2776 s TYPICAL CHARACTERISTICS Output Noise Voltage vs. Temperature V +1=2.3V, V +2=1.2V, RL=16, Rg=600, A-Weighted -60 100 Channel Separation vs. Frequency V +1=2.3V, V +2=1.2V, Vin=-30dBV, RL=16, Ta=25o C -70 Output Noise Voltage [dBV] Channel Separation [dB] 80 -80 60 -90 40 -100 20 -110 -50 0 50 Ta [ C] o 100 150 0 0.01 0.1 1 Frequency [kHz] 10 Mute Level vs. Frequency V 1=2.3V, V 2=1.2V, Vin=-30dBV=0dB, RL=16 , Ta=25 C 1kHz Band pass, STANDBY -30 -40 -50 Mute Level [dB] -60 -70 -80 -90 -100 -110 0.01 Mute Level [dB] + + o Mute Level vs. Temperature V +1=2.3V, V +2=1.2V, Vin=-30dBV=0dB, f=1KHz, RL=16 1kHz Band pass STANDBY -30 -40 -50 -60 -70 -80 -90 -100 -110 -50 0.1 1 10 100 0 50 Ta [ C] o 100 150 Frequency [kHz] PSRR vs. frequency (V 1) V +1=1.8V+0.1Vrms, V+2=0.9V, Rg=600, RL=16, Ta=25oC 100 100 + PSRR vs. frequency (V 2) V +1=1.8V, V +2=0.9V+0.1Vrms, Rg=600, RL=16, Ta=25o C + 80 80 40 PSRR [dB] PSRR [dB] 60 60 40 20 20 0 0.01 0.1 1 10 100 0 0.01 0.1 1 10 100 Frequency [kHz] Frequency [kHz] -9- NJM2776 s TYPICAL CHARACTERISTICS Gain vs. STANDBY Control Voltage V +1=2.3V, V+2=1.2V, Vin=-30dBV, f=1kHz, RL=16 20 0 -20 Gain [dB] -40 -60 -80 -100 -120 -0.5 Ta=-20oC Ta=25o C Ta=75o C 0 0.5 1 1.5 2 STANDBY Control Voltage [V] [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 - |
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