Features
16/18/20/24-bits input with I2
S, Left-alignment
and 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
88.2kHz/96kHz
System clock = 32x, 48x, 64x, 96x, 128x, 192x,
256x Fs
BCLK system:
32x~256x Fs for 8kHz, 16kHz and 32kHz /
44.1kHz / 48kHz and 88.2kHz / 96kHz
Supply voltage
3.3V/1.8V for digital circuit
4.5V~26V for loudspeaker driver
Supports 2.0CH/Mono configuration
Loudspeaker output power@12V for stereo
7W x 2CH into 8Ω <1% THD+N
10W x 2CH into 4Ω <1% THD+N
Loudspeaker output power@18V for stereo
15W x 2CH into 8Ω <1% THD+N
Loudspeaker output power@24V for stereo
31W x 2CH into 8Ω <1% THD+N
Sound processing including：
40 bands parametric EQ
Volume control (+24dB~-103dB, 0.125dB/step)
Three Band plus post Dynamic range control
Auto Gain Limiter
Power Clipping
Programmed 3D surround sound
Channel mixing
Noise gate with hysteresis window
DC-blocking high-pass filter
Pre-scale/post-scale
I
2
S output with user programmed gain
(+24dB~mute)
I
2
S/TDM output with selectable Audio DSP point
Anti-pop design
Level meter and power meter
Short circuit and over-temperature protection
 Over voltage protection
Supports Dynamic Temperature Control (DTC)
Supports I2C control without clock
I
2C control interface with 4 selectable device
address
LV Under-voltage shutdown and HV Under-voltage
detection
Auto clock detection
Power saving mode

Applications
TV audio
Boom-box, CD and DVD receiver, docking system
Powered speaker
Wireless audio

Description
AD82178 is a digital audio amplifier capable of
driving 25W (31W peak) each to a pair of 8Ω load
speaker (BTL) and 50W (62W peak) to a 4Ω load
speaker (PBTL) operating at 24V supply without
external heat-sink or fan requirement with play music.
AD82178 provides advanced audio processing
functions, such as volume control, 40 EQ bands, audio
mixing, 3D surround sound and Dynamic Range
Control (DRC) and Auto Gain Limiter (AGL). These
are fully programmable via a simple I
2C control
interface. Robust protection circuits are provided to
protect AD82178 from damage due to accidental
erroneous operating condition. The full digital circuit
design of AD82178 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.
AD82178 is pop free during instantaneous power
on/off or mute/shut down switching because of its
robust built-in anti-pop circuit.