描述 Description

The A21SP16 is a differential class-D BTL power amplifier. It is able to drive up to 2.3 W into a 4 Ω load and 1.4 W into a 8 Ω 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.

特性 Features

? Operating from VCC = 2.4 V to 5.5 V
? Standby mode active low
? Output power: 3 W into 4 Ω and 1.75 W into 8 Ω 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 Ω with 1% THD+N max
? Output power: 1.4 W @ 5 V or 0.45 W @ 3 V into 8 Ω 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 μm (Pb-free)