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| NJM2770 HIGH-POWER & LOW-VOLTAGE AUDIO POWER AMPLIFIER s GENERAL DESCRIPTION The NJM2770 is high-power and low-voltage audio power amplifier with standby function. No external coupling capacitors required because of the differential output type. Two external resistors adjust the closed loop gain. The output power is 250mW typical at 3V-supply 8ohm-load, and 400mW typical at 4.5v-supply 16ohm-load. The standby current is only 0.1A typical. The package of NJM2770 is VSP8, and suitable for PCS, codeless telephone, speaker amplifier for hands free system, and especially cellular phone because of low operating current, low standby current, and high power output. s FEATURS qOperating Voltage qOperating Current qLow Power-Down Current qHigh Power Otput 250mW typ. 400mW typ. qGain Range at Voice Band qLoad Impedance qThermal Shut Down Function q Package Outline q Bipolar Technology s PACKAGE OUTLINE NJM2770R NJM2770RB1 +2-+4.5V 2.0mA typ.,at V+=3V 0.1A typ at V+=3V,RL=8 V+=4.5V,RL=16 Gv=0-43dB RL=4-200 VSP8,TVSP8 s PIN CONFIGURATION & BLOCK DIAGRAM Pin Function V+ 6 BIAS -VIN 4 +VIN 3 #A 1 CD 5 VOUT1 1.CD 2.+VREF 3.+VIN 4.-VIN 5.VOUT1 6.V + 7.GND 8.VOUT2 40k 40k #B +VREF 2 50k 145k 50k 8 VOUT2 TSD 7 GND -1- NJM2770 s ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Supply Voltage V+ Power Dissipation Operating Temperature Range Storage Temperature Range PD Topr Tstg RATINGS +5 (VSP8,TVSP8) 400 -40 to +85 -40 to +150 (Ta=25C) UNIT V mW C C + s ELECTRICAL CHARACTERISTICS (V =3.0V,RL=8,f=1kHz,1pin=2V,Ta=25C,unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Operating Voltage Range V+ 2.0 4.5 V Operating Current ICC RL=,no signal 2.0 4.0 mA Power Down Current ICCD RL= 1pin=0.8V,no signal 0.1 1.0 A Open Loop Gain A V1 80 85 dB Amp#A, f<100Hz Closed Loop Gain AV2 -0.35 0 +0.35 dB Amp#B Output Power PO1 THD=10% 110 250 mW 200 400 mW PO2 V+=4.5V, RL=16, THD=10% Total Harmonic Distortion THD1 PO=100mW, GVD=6dB 0.1 0.5 % + 0.1 % THD2 V =4.5V, RL=16, PO=150mW, GVD=6dB Power Supply Rejection SVR1 50 dB C1=, C2=0.01F, DC Ratio + (V =3.0V-4.5V) SVR2 35 dB C1=0.1F, C2=0 SVR3 70 dB C1=1.0F, C2=4.7F Mute Attenuation MAT f =1kHz-20kHz, 1pin=0.8V 80 dB Output Voltage VO1 0.95 1.10 1.25 V + VO2 1.85 V (Rf=20k, DC) V =4.5V, RL=16 Output High Level VOH IOUT=-75mA, V+=2.0-4.5V V+-1.0 V Output Low Level VOL IOUT=75mA, V+=2.0-4.5V 0.21 V -30 0 +30 mV Output DC Offset Rf=20k, 5pin-8pin VO Input Bias Current IB 4pin -100 100 nA Equivalent Resistance R+IN 3pin 100 170 220 k RREF 2pin 18 26 40 k CD Input Voltage H VCDH 1pin 2.0 V+ V CD Input Voltage L VCDL 1pin 0.0 0.8 V CD Input Resistance RCD V+=VCD=4.5V, 1pin 50 85 175 k s CONTROL TERMINAL EXPLANATION CHIP DISABLE CONTROL(CD PIN) PARAMETER CONTROL SIGNAL CD OFF H(=VCDH) CD ON L(=VCDL) STATUS IC is active. IC is standby. (with Mute) -2- NJM2770 s APPLICATION CURCUIT V+=+3V 10F Rf 20k 6 BIAS Ci INPUT 0.1F 20k 3 C1 1.0F C2 2 4.7F 50k TSD Ri 4 #A 1 CD(POWER DOWN) 5 SPEAKER 8/16 50k 145k #B 8 7 note:1.The CD terminal(1pin) should connect High level(>2.0V), when NJM2770 is active. The standby mode, when the CD terminal is Low level(<0.8V). 2.To add the C1 and C2 capacitor, the power-supply-rejection-ratio will be improved. When C1 is large vaiue, C2 will be unnecessary. 3.The power-up time depend on the C1 and C2 capacitor. 4.The input current of CD terminal is as shown below figure. V + 72k 1pin 80k GND 5.No connect oscillation-protect RC required. To connect oscillation-protect RC, if the NJM2770 oscillate with PC board/stray capacitor/long speaker wire and others condition. -3- NJM2770 MEMO [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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