Audio Amplifier Stages; Main Amplifier (U8) (10W/12W Options) - VESTEL MB120 DS Service Manual

4. AUDIO AMPLIFIER STAGES

A. MAIN AMPLIFIER (U8) (10W/12W OPTİONS)
Description
AD82587D is a digital audio amplifier capable of driving a pair of 8 ohm, 20W or a single 4 ohm, 40W
speaker, both which operate with play music at a 24V supply without external heat-sink or fan requirement.
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Using I C digital control interface, the user can control AD82587D's input format selection, DRC (dynamic
range control), mute and volume control functions. AD82587D has many built-in protection circuits to
safeguard AD82587D from connection errors.
Features
• 16/18/20/24-bit input with I
• PSNR & DR(A-weighting) Loudspeaker: 97dB (PSNR), 105dB (DR) @ 24V
• Multiple sampling frequencies (Fs)
− 32kHz / 44.1kHz / 48kHz and
− 64kHz / 88.2kHz / 96kHz and
− 128kHz/176.4kHz/192kHz
• System clock = 64x, 128x, 256x, 384x, 512x, 768x,1024x Fs
− 256x~1024x Fs for 32kHz / 44.1kHz / 48kHz
− 128x~512x Fs for 64kHz / 88.2kHz / 96kHz
− 64x~256x Fs for 128kHz /176.4kHz/192kHz
• Supply voltage
− 3.3V for digital circuit
− 10V~26V for loudspeaker driver
• Loudspeaker output power for Stereo@ 24V
− 10W x 2ch into 8_ @ 0.16% THD+N
− 15W x 2ch into 8_ @ 0.18% THD+N
− 20W x 2ch into 8_ @ 0.24% THD+N
• Loudspeaker output power for Mono@ 24V
− 20W x 1ch into 4_ @ 0.17% THD+N
− 30W x 1ch into 4_ @ 0.2% THD+N
− 40W x 1ch into 4_ @ 0.24% THD+N
• Sounds processing including:
− Volume control (+24dB~-103dB, 0.125dB/step)
− Dynamic range control
− Power clipping
− Channel mixing
− User programmed noise gate with hysteresis window
− DC-blocking high-pass filter
• Anti-pop design
• Short circuit and over-temperature protection
• I2C control interface with selectable device address
• Internal PLL
• LV Under-voltage shutdown and HV Under-voltage
• detection
• Power saving mode
• Dynamic temperature control
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S, Left-alignment and Right-alignment data format