APA4800 / APA4801 is an SO-8 or DIP-8 plastic encapsulated Class A and B stereo audio amplifier IC produced by Anec Corporation. It is mainly used in portable digital audio, PC and microphone amplifiers.
Stereo 290mW, 8Ω audio amplifier circuit driven by APA4800 is shown in Figure 1. APA4800 has built-in amplifiers A and B, whose non-inverting terminals (1NA +, 1NB +) are connected together, and a reference voltage (VRFE) of 1 / 2VDD is applied. The power supply voltage range is 3 to 7V, and the no-load power supply current is 205mA (when VDD = 5V). The two input VINA and VINB are applied to the inverting input terminals INA- and INB- of amplifiers A and B via CiA, RiA and CiB, and RiB, respectively. Applied to the load RLA and RLB. The CCA, RCA, and CCB, and RCB that connect IC ①and ② and ⑦ and ⑥ are the frequency compensation components of A and B, respectively. The signal-to-noise ratio (S / N) reaches 100dB, the ratio of total harmonic distortion plus noise to signal [(THD + N) / S] is 0.15% (typical value), the slew rate is 5V / μs, and the power supply ripple is suppressed The ratio (PSR) is 55 dB, and the operating temperature range is -40 to + 85 ° C.
The 280mW, 8Ω stereo audio amplifier circuit using APA4801 as the driver is shown in Figure 2. Compared with APA4800, APA4801 integrates a resistor divider, which eliminates external resistance. At the same time, APA 4801 also has an excellent noise-free adjustment function to achieve flexible noise-free adjustment and switch-free click. The function of IC's Mut pin (② pin) is to disable the chip control input (disabble). When the Mute foot is "H", the speaker will act; when it is "L", the sound will continue to decrease (Mute on). When IC is at VDD = 5V and no-load power supply IDD = 2.5mA, the standby current is only 150μA, the input voltage of the Mute pin is 0.8V, the noise-free adjustment attenuation (ATT) is 75dB, (THD + N) S = 0. 1%, S / N = 100dB, slew rate is 5V / μs. At 10% (THD + N), the output power into an 8Ω load is 280mW; when RL = 16Ω, the output power is 160mW. Power supply voltage ripple suppression (PSRR) = 76dB.
The value of the amplifier input capacitance (Cia, CiB) affects the low frequency performance of the circuit. If the frequency of the high-pass filter (HPF) formed by the 130 kΩ resistance in Ci and IC is fc, then Ci = 1 / (2π × 130kΩ × fC). In this circuit, Ci selects 1μF ceramic dielectric capacitor.

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