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LC78857V датащи(PDF) 5 Page - Sanyo Semicon Device |
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LC78857V датащи(HTML) 5 Page - Sanyo Semicon Device |
5 / 11 page Circuit Operation The LC78857V consists of three main blocks: the digital filter block, the sigma-delta D/A converter block, and the analog filter block. [Digital Filter Block] The LC78857V performs the following calculations. • Normal speed mode: • Double speed mode: This mode is used, for example, when dubbing a CD to cassette tape at double speed. Although the XIN has the same frequency as normal speed mode, BCLK, LRCK, and DATA are input at twice the rate used in normal speed. [Sigma-Delta D/A Converter Block] This circuit accepts 8fs data input and outputs a 384fs 1-bit data sequence. [Analog Low-Pass Filter Block] This block consists of an analog low-pass filter that consists of on-chip resistors, capacitors, and operational amplifiers. This block converts the 384fs 1-bit data streams A and B directly to an analog voltage output. No. 5537-5/11 LC78857V Input Attenuator Deemphas is first- order IIR filter 31st-order FIR filter 11th-order FIR filter 3rd-order FIR filter To the sigma-delta D/A converter Input Attenuator Deemphas is first- order IIR filter 31st-order FIR filter 3rd-order FIR filter To the sigma-delta D/A converter fs* = double speed input = 2 × fs. From the digital filters Front-end interpolation 3rd-order noise shaper PWM D/A converter 1-bit output A 1-bit output B 1-bit output A 1-bit output B |
Аналогичный номер детали - LC78857V |
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Аналогичное описание - LC78857V |
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