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| KA8602B INTRODUCTION LOW VOLTAGE AUDIO AMPLIFIER 8-DIP-300 The KA8602B is the audio power amplifier available for low voltages. KA8602B supplies differential outputs for maximizing output swing at low voltages. KA8602B doesn't need coupling capacitors to the speaker. The gain of this amp is controlled easily by two external resistors. FEATURES l l l l l l l l 8-SOP-225 Wide Supply Voltage (2 ~ 16V) Low Quiescent Supply Current (ICC = 2.7mA : Typ) Easy Gain Control Medium Output Power PO = 250mW at VCC = 6V, RL = 32, THD = 10% Minimum External Parts Load Impedance Range (8~ 100) Low Distortion Mute Function (lCC = 65A : Typ) ORDERING INFORMATION Device KA8602B KA8602BD Package 8-DIP-300 8-SOP-225 - 20C ~ + 70C Operating Temperature BLOCK DIAGRAM INPUT(-) 2 INPUT(+) 1 Amp1 3 R OUTPUT1 + R Amp2 6 OUTPUT2 + Vcc 4 BIAS CIRCUIT 7 MUTE 8 RIPPLE REJECTION 5 GND Fig. 1 KA8602B LOW VOLTAGE AUDIO AMPLIFIER PIN CONFIGURATION INPUT(+) 1 8 RIPPLE REJECTION INPUT(-) 2 7 MUTE KA8602B OUTPUT1 3 6 OUTPUT2 Vcc 4 5 GND Fig. 2 PIN DESCRIPTION Pin No Symbol Description Analog Ground for the amplifiers. A 1.0F capacitor at this pin (with a 5.0F 1 Input (+) capacitor at pin 8) provides 52dB (Typ) of power supply rejection. Turn-on time of the circuit is affected by the capacitor on this pin. This pin can be used as an alternative input. 2 3 4 5 6 Input (-) Output 1 VCC GND Output 2 Amplifier input. The input capacitor and resistor set low frequency roll-off and input impedance. The feedback resistor is connected between this pin and output1. Amplifier 1' output. The DC Level is s Ground pin. Amplifier 2' output. This signal is equal in amplitude, but 180 out of phase with s that at output1. The DC level is l l l l (VCC - 0.7V)/2. DC supply voltage (+2.0 ~ + 16V) is applied to this pin. o (VCC - 0.7V)/2. This pin can be used to power down the IC to conserve power, or for muting, or 7 Mute both. When at a logic "Low" (0 to 0.8 volts), the KA8602B is enabled for normal operation. When at a logic "High" (2.0 to VCC volts), the IC is disabled. If Mute is open, that is equivalent to a logic "Low". 8 Ripple Rejection A capacitor at this pin increases power supply rejection, and affects turn-on time. This pin can be left open if the capacitor at pin 1 is sufficient. ABSOLUTE MAXIMUM RATINGS Characteristic Supply Voltage Output Current (output pin) Maximum Voltage (input, Ripple rejection, Mute pin) Applied Output Voltage (output pin) when disabled Junction Temperature Symbol VCC IO VI (MAX) VO TJ Vale - 1.0 ~ + 18 250 - 1.0 ~ VCC + 1.0 - 1.0 ~ VCC + 1.0 - 55 ~ + 140 Unit V mA V V C KA8602B LOW VOLTAGE AUDIO AMPLIFIER RECOMMENDED OPERATING CONDITIONS (Ta = 25C) Characteristic Supply Voltage Load Impedance Peak Load Current Differential Gain (5KHz Bandwidth) Voltage at Mute (Pin 7) Ambient Temperature Symbol VCC ZL IL (PK) GV VI (MUTE) Ta 0 0 -20 Min +2.0 8 Typ Max +16 100 200 46 VCC 470 Unit V mA dB V C ELECTRICAL CHARACTERISTIC (VCC = 6V, Ta = 25C, unless otherwise noted) Characteristic Symbol Test Conditions Min Typ Max Unit DC ELECTRICAL CHARACTERISTICS Operating Current (RL = 0) VCC = 3.0V, Mute = 0.8V ICC VCC = 16.0V, Mute = 0.8V VCC = 3.0V, Mute = 2.0V VO VOO VOH VOL IBIAS REQ VIL (MUTE) VIH (MUTE) RI (MUTE) GV (AMP1) GV (AMP2) PO f = 1.0KHz, RL = 32 VCC = 3.0V, RL = 6, THD 10% Output Power VCC = 6.0V, RL = 32, THD 10% VCC = 12V, RL = 100, THD 10% Total Harmonic Distortion (f = 1.0KHz) Gain Bandwidth Product Power Supply Rejection (VCC = 6.0V, VCC = 3.0V) Muting VCC = 6.0V, RL = 32, PO =125mW THD GBW C1 = , C2 = 0.01F PSRR GV (MUTE) C1 =0.1F, C2=0, f=1.0KHz C1 = 1.0F, C2 = 5.0F, f = 1.0KHz Mute = 2.0V, 1.0Khz f 20KHz 50 12 52 > 70 dB VCC3.0V, RL = 8, PO = 20mW VCC12V, RL = 32, PO = 200mW VCC = Mute = 16V 2.0 50 80 -0.35 55 250 400 0.5 0.5 0.6 1.5 MHz dB 1.0 % mW 0 +0.35 90 175 pin 1 pin 8 100 18 RL = 16 R1 = 75K VCC = 3.0V VCC = 6.0V VCC = 12.0V -30 1.0 2.7 3.3 65 1.15 2.65 5.65 0 VCC-1.0 0.16 -100 150 25 -200 220 40 0.8 V V K dB dB +30 mV V V nA K 4.0 5.0 100 1.25 V A mA Output Voltage (output pin) Output Offset Voltage Output High Level Output Low Level Input Bias Current (pin 2) Equivalent Resistance Input Low Voltage Mute Input High Voltage Input Resistance Open Loop Gain (Amp 1) Close Loop Gain (Amp 2) VCC = 6.0V, Rf = 75K, RL = 32 2.0V VCC 16V, Iout = -75mA 2.0V VCC 16V, Iout = 75mA AC ELECTRICAL CHARACTERISTICS KA8602B LOW VOLTAGE AUDIO AMPLIFIER APPLICATION CIRCUIT Vcc Mute Rf 4 0.1F Audio Input Ri 2 7 3 KA8602B 1 8 + 5F 5 6 Speaker + 1F Fig. 3 Vcc Mute 75K 4 0.1F Audio Input 2 7 3 KA8602B 1 3K + 0.1F 8 + 5F 5 6 Speaker Fig. 4 KA8602B LOW VOLTAGE AUDIO AMPLIFIER Vcc(1.0 ~8.0V) 75K Vcc 4 0.1F Audio Input 3K 2 7 4.7K 3 KA8602B 1 8 5 10K VEE( -1.0 ~ -8.0V) 20K 6 Speaker 20K Mute Fig. 5 Vcc Mute Vcc Mute 101 75K 100K 100K 100 4 0.1F Audio Input 2 7 3 4 7 3 KA8602B 1 8 503 5 6 Speaker 0.1F Audio Input 2 KA8602B 1 8 503 5 6 Speaker 503 + 5.1K 5.1K 5F 5.1K 5.1K 503 + 5F Fig. 6 Fig. 7 |
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