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Description
AD82128 is a digital audio amplifier capable of driving 25W (BTL) each to a pair of 8Ω load speaker and 50W (PBTL) to a 4Ω load speaker operating at 24V supply without external heat-sink or fan requirement with play music. AD82128 provides advanced audio processing functions, such as volume control, 32 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 AD82128 from damage due to accidental erroneous operating condition. The full digital circuit design of AD82128 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. AD82128 is pop free during instantaneous power on/off or mute/shut down switching because of its robust built-in anti-pop circuit.
Features
16/18/20/24-bits input with I2S, Left-alignment, Right-alignment and TDM data format
PSNR & DR(A-weighting)
Loudspeaker: 107dB (PSNR), 108dB (DR)@24V
Multiple sampling frequencies (Fs)
8kHz, 16kHz, 32kHz/44.1kHz/48kHz and
64kHz/88.2kHz/96kHz
System clock = 64x, 128x, 192x, 256x, 384x,
512x, 576x, 768x, 1024x Fs
MCLK system: (option with AD82129)
256x~4096x Fs for 8kHz
128x~2048x Fs for 16kHz
64x~1024x Fs for 32kHz/44.1kHz/48kHz
64x~512x Fs for 64kHz/88.2kHz/96kHz
BCLK system:
256x Fs for 8kHz (TDM mode)
128x Fs and 256xFs for 16kHz (TDM mode)
64x Fs for 32kHz/44.1kHz/48kHz
64x Fs for 64kHz/88.2kHz/96kHz
Supply voltage
1.65~3.6V for DVDDIO (option with AD82121)
3.0~3.6V for DVDD
4.5~26V for PVDD
Supports 2.0CH/Mono configuration
Loudspeaker output power@12V for stereo
8W x 2CH into 8Ω @ 1% THD+N
15W x 2CH into 4Ω @ 1% THD+N
Loudspeaker output power@24V for stereo
25W x 2CH into 8Ω <1% THD+N
Sound processing including：
32 bands parametric speaker EQ
Volume control (+24dB~-103dB, 0.125dB/step)
Dynamic range control
Three Band plus post Dynamic range control
Power Clipping
Programmed 3D surround sound
Channel mixing
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)
Anti-pop design
Level meter and power meter
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
Support hardware and software reset
Internal PLL
LV Under-voltage shutdown and HV Under-voltage detection
Over voltage protection
Applications
TV audio
Boom-box, CD and DVD receiver, docking system
Powered speaker
Wireless audio
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