VESTEL MB130 IDTV, Руководство по обслуживанию

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10
A. MAIN AMPLIFIER (U123) (8W/10W/12W OPTIONS)
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.
Using I
2
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
2
S, Left-alignment and Right-alignment data format

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