Features 

● 16/18/20/24-bits input with I2S, Left-alignment, 

Right-alignment and TDM data format 

● PSNR & DR(A-weighting) 

Loudspeaker: 108dB (PSNR), 112dB (DR)@24V 

● Multiple sampling frequencies (Fs) 

8kHz, 16kHz, 32kHz/44.1kHz/48kHz and 

88.2kHz/96kHz 

● System clock = 32x, 48x, 64x, 96x, 128x, 192x, 

256x,384x, and 512xFs 

● Supply voltage 

1.65~3.6V for DVDD 

8~26V for PVDD 

● Supports 2.0CH/Mono configuration 

8W x 2CH into 8Ω @ 1% THD+N at 12V 

15W x 2CH into 4Ω @ 1% THD+N at 12V 

25W x 2CH into 8Ω @ <1% THD+N at 24V 

50W x 1CH into 4Ω @ <1% THD+N at 24V 

● Sound processing including：

46 bands parametric speaker EQ 

Volume control (+24dB~-103dB, 0.125dB/step) 

Dynamic range control 

Three Band plus post Dynamic range control 

Auto Gain Limiter 

Power Clipping 

Programmed 3D surround sound 

Noise gate with hysteresis window 

DC-blocking high-pass filter 

Pre-scale/post-scale 

Post-Boost (+48dB) 

I2S output with user programmed gain 

(+24dB~mute) 

Compensate filter 

DPEQ 

DTC 

Auto clock detection 

● Anti-pop design 

● I2S output with selectable Audio DSP point 

● Short circuit and over-temperature protection 

● Supports I2C control without clock 

● I2C control interface with selectable device address

● Internal PLL 

● LV Under-voltage shutdown and HV Under-voltage detection 

● Over voltage protection 

● Power saving mode 

Applications 

● TV audio 

● Boom-box, CD and DVD receiver, docking system 

● Powered speaker 

● Wireless audio 

Description 

AD82120B is a digital audio amplifier capable of driving 25W each to a pair of 8Ω load speaker (BTL) or 50W to a 4Ω load speaker (PBTL) operating at 24V supply, that’s no external heat-sink or fan requirement during music playing. 

AD82120B provides advanced audio processing functions, such as volume control, 46 EQ bands, audio mixing, 3D surround sound and Dynamic Range Control (DRC). These are fully programmable via a simple I2C control interface. Robust protection circuits are provided to protect AD82120B from damage due to accidental erroneous operating condition. The full digital circuit design of AD82120B is more tolerant to noise and PVT (Process, Voltage, and Temperature) variation than the analog class-AB or class-D audio amplifier counterpart implemented by analog circuit design. AD82120B is pop free during instantaneous power on/off or mute/shut down switching because of its robust built-in anti-pop circuit.