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| BL8602 BL8602 Low Power Audio Amplifier DESCRIPTION The BL8602 is a low power audio amplifier integrated circuit intended(primarily) for telephone applications, such as in speakerphones. It provides differential speaker outputs to maximize output swing at low supply voltages(2.0 V minimum).Coupling capacitors to the speaker are not required. The gain of this amplifier is controlled easily by two external resistors. FEATURES * Wide operating supply voltage: Vcc=2V~16V * Low quiescent supply current(Icc=2.2mA,typ) * Medium output power(Po=250mW at Vcc=6V, RL=32ohm,THD10%) * Load impedance range : 8~100ohm * Mute function (Icc=55uA, typ) * Minimum number of external parts required * Low distortion BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS(Ta=25) PARAMETER Supply Voltage Output Current Maximum Input,Ripple Rejection, Mute Pin Voltage Applied Output Voltage( Output Pin When Disabled) Temperature Junction SYMBOL Vcc Io Vi(max) Vo Tj VALUE -1~18 250 -1~Vcc+1 -1~Vcc+1 -55~150 UNIT V MA V V http://www.belling.com.cn -1- 8/15/2006 Wrote by 2006 Total 4 Pages BL8602 PIN CONNECTIONS PIN FUNCTION DESCRIPTION Symbol FC1 Pin 1 Description Analog ground for amplifiers. A 1.0uF capacitor at this pin (with a 5.0uF capacitor at Pin 2) provides (typically) 52dB 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 alternate input. Amplifier input .The input capacitor and resistor set low frequency rolloff and input impedence. The feedback resistor is connected to this pin and Vo1. Amplifier Output#1. The dc level is (Vcc-0.7V)/2. DC supply voltage (+2.0V to +16V) is applied to this pin. Ground pin for the entire circuit Amplifier Output#2. This signal is equal in amplitude, but 180outof-phase with that at Vo1. The dc level is (Vcc-0.7V)/2. Chip Disable-Digital input. A Logic "0" (<0.8V) sets normal operation. A logic "1" (2.0V) sets the power down mode. Input impedance is nominally 90 k. A capacitor at this pin increase power supply rejection, and affects turn-on time. This pin can be left open if the capacitor at FC1 is sufficient. Vin 2 Vo1 Vcc GND Vo2 CD 3 4 5 6 7 FC2 8 RECOMMENDED OPERATION CONDITIONS(Ta=25) PARAMETER Supply Voltage Load Impedance Peak Load Current Differental Gain(5KHz Bandwidth) Voltage at Mute Ambient Temperature SYMBOL Vcc ZL IL(peak) Gv Vi(mute) Ta VALUE 2~16 8~100 200 0~46 0~Vcc -20~70 UNIT V mA dB V http://www.belling.com.cn -2- 8/15/2006 Wrote by 2006 Total 4 Pages BL8602 ELECTRICAL CHARACTERISTICS (Vcc=6V, Ta=25,unless otherwise specified) PARAMETER DC PARAMETER Operating Current SYMBO L Icc TEST CONDITIONS MIN TYP MAX UNI T mA mA uA V V V mV V V -200 nA K K dB Output Voltage Vo Output Offset Voltage Output High Level Output Low Level Input Bias Current Equivalent Resistance AC PARAMETER Open Loop Gain of Amp 1. ( f<100Hz) Close Loop Gain of Amp 2. Output Power Voo VOH VOL ibias REQ Vcc=3V, Mute=0.8V Vcc=16V, Mute=0.8V Vcc=3V, Mute=2V RL=16,Rf=75K Vcc=3V Vcc=6V Vcc=12V Vcc=6V,Rf=75K,RL=32 2V 4.0 5.0 100 1.25 -30 30 100 18 80 Gvop1 Gvo2 Po f=1KHz, RL=32 Vcc=3V, RL=16,THD 10% Vcc=6V, RL=32,THD 10% Vcc=12V, RL=100, THD10% Vcc=6V, RL=32 ,Po=125mW Vcc3V, RL=8 ,Po=20mW Vcc12V,RL=32, Po=200mW -0.35 55 250 400 0 0.35 dB mW Total Harmonic Distortion( f=1KHz ) THD 0.5 0.5 0.6 1.5 1.0 % % % MHz dB dB dB dB Gain Bandwidth Product Power Supply Rejection (Vcc=6V, Vcc=3V) Muting GBW PSRR C1=,C2=0.01uF C1=0.1uF, C2=0, f=1KHz C1=1uF, C2=5uF, f=1KHz Mute=2V, 1KHz Gv(mut e) Chip Disable input Voltage Low VIL High VIH 0.8 2.0 V V http://www.belling.com.cn -3- 8/15/2006 Wrote by 2006 Total 4 Pages BL8602 APPLICATION CIRCUIT http://www.belling.com.cn -4- 8/15/2006 Wrote by 2006 Total 4 Pages |
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