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A21SP16 Datasheet(PDF) 1 Page - STMicroelectronics |
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A21SP16 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 37 page  This is information on a product in full production. March 2014 DocID026037 Rev 1 1/37 A21SP16 3 W filter-free class-D audio power amplifier Datasheet - production data Features Operating from V CC = 2.4 V to 5.5 V Standby mode active low Output power: 3 W into 4 and 1.75 W into 8 with 10% THD+N max and 5 V power supply Output power: 2.3 W @ 5 V or 0.75 W @ 3 V into 4 with 1% THD+N max Output power: 1.4 W @ 5 V or 0.45 W @ 3 V into 8 with 1% THD+N max Adjustable gain via external resistors Low current consumption 2 mA @ 3 V Efficiency: 88% typ. Signal to noise ratio: 85 dB typ. PSRR: 63 dB typ. @ 217 Hz with 6 dB gain PWM base frequency: 250 kHz Low pop & click noise Thermal shutdown protection Available in flip-chip 9 x 300 m (Pb-free) Applications Wearable Fitness and healthcare Cellular phone PDA Description The A21SP16 is a differential class-D BTL power amplifier. It is able to drive up to 2.3 W into a 4 load and 1.4 W into a 8 load at 5 V. It achieves outstanding efficiency (88% typ.) compared to classical Class-AB audio amps. The gain of the device can be controlled via two external gain-setting resistors. Pop & click reduction circuitry provides low on/off switch noise while allowing the device to start within 5 ms. A standby function (active low) allows the reduction of current consumption to 10 nA typ. V DD 1/A1 7/C1 8/C2 9/C3 4/B1 6/B3 2/A2 3/A3 5/B2 V DD IN - IN + GND STBY GND OUT + OUT - V DD 1/A1 7/C1 8/C2 9/C3 4/B1 6/B3 2/A2 3/A3 5/B2 V DD IN - IN + GND STBY GND OUT + OUT - Pin connection IN+: positive differential input IN-: negative differential input VDD: analog power supply GND: power supply ground STBY: standby pin (active low) OUT+: positive differential output OUT-: negative differential output In- Stdby In+ Out- Out+ Vcc C2 C1 A1 A2 A3 B1 B2 B3 C3 GND Internal Bias PWM Output Bridge H Oscillator 150k 150k + - Block diagram Table 1. Order codes Part number Temperature range Package Packing Marking A21SP16 -40 °C to +85 °C Lead-free flip-chip Tape & reel 62 www.st.com |
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