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2. YDA148
YDA148 (D-510) is a high-efficiency digital audio power amplifier IC with the maximum output of 15W
× 2ch.
YDA148 has a "Pure Pulse Direct Speaker Drive Circuit" that directly drives speakers while reducing
distortion of pulse output signal and reducing noise on the signal, which realizes the highest standard
low distortion rate characteristics and low noise characteristics among digital amplifier ICs in the same
class.
In addition, supporting filterless design allows circuit design with fewer external parts to be realized
depending on use conditions.
YDA148 features Power Limit Function, Non-clip Function, and DRC (Dynamic Range Control)
Function that were developed by Yamaha original digital amplifier technology.
YDA148 has overcurrent protection function for speaker output terminals, high temperature protection
function, and lowsupply voltage malfunction prevention function.
3. 61P803-RG480WT
Embedded Turbo 8052 CPU
Normal operation mode: 12MHz, 6MHz, 3MHz, 1MHz (Selectable Clock Sources)
Instruction execution time : Min. =250ns at OSC=12Mhz
Memory:
RAM: 1K+256 Bytes
Flash memory : 48K Bytes
5 similar 8052 timers: Timer0, Timer1, Timer2, Timer3, Timer4
3 similar 8052 UART ports, support baud rate 115200 – 1200 at OSC = 12MHz
Philips BDL5545E
36
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