深圳市微桥科技有限公司

AD85020B- 2x20W Stereo / 1x40W Mono Digital Audio Amplifier With 36 Bands EQ Functions DataSheet

Description

AD85020B is a digital audio amplifier capable of

driving. a pair of 8Ω,20W or a single 4Ω,40W speaker

output. In headphone output mode, it can delivered

25mW into 32Ω load for head phone output.

AD85020B provides advanced audio processing

functions, such as volume control, 36 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 AD85020B from damage due

to accidental erroneous operating condition. The full

digital circuit design of AD85020B is tolerant of noise

and PVT (Process, Voltage, and Temperature)

variation. AD85020B 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

and Right-alignment data format

_ Multiple sampling frequencies (Fs)

8kHz and 32kHz / 44.1kHz / 48kHz and

64kHz / 88.2kHz / 96kHz and

128kHz / 176.4kHz / 192kHz

_ System clock = 64x, 128x, 192x, 256x, 384x,

512x, 576x, 768x, 1024x Fs

MCLK system:

256x~4096x Fs for 8kHz

64x~1024x Fs for 32kHz / 44.1kHz / 48kHz

64x~512x Fs for 64kHz / 88.2kHz / 96kHz

64x~256x Fs for 128kHz / 176.4kHz / 192kHz

BCLK system:

64xFs for 32kHz / 44.1kHz / 48kHz

64xFs for 64kHz / 88.2kHz / 96kHz

64xFs for 128kHz / 176.4kHz / 192kHz

_ Supply voltage

1.8V or 3.3V for digital I/O

3.3V for analog circuit and headphone driver

4.5V~26V for loudspeaker driver

_ Speaker or headphone out selection

_Line-driver maximum output swing into 10kΩ

- 2Vrms at 3.3V supply voltage

_ Headphone output power

25mW x 2ch into 32Ω @ 0.1% THD+N

_ Speaker output power

20W x 2ch into 8Ω @ <1% THD+N@24V

_ Sound processing including：

36 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

Bass/Treble tone control

DC-blocking high-pass filter

Pre-scale/post-scale

Virtual Bass/exciter

Dynamic bass

_ Anti-pop design

_ Level meter and power meter

_ I2S output with selectable audio DSP point

_ Supports I2C control without clock

_ I2C control interface with selectable device

address

_ Internal PLL

_ Protection

■ OCP■ OVP■ UVP■ OTP

_ Closed-loop structure with good PSRR

_ Supports Filter-less operating

_ Superior EMC performance

Applications

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

_ Powered speaker

_ Wireless audio

_ AI speaker