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
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