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.