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MIMETISM 20.1

Drive ATAPI IDE - Asynchronous sample rate converter T.I.SRC4190 / 44.1Khz to 192 Khz Converter D/A - WOLSON Delta-sigma WM8740 - Transformer TORIQUE 100VA Analog connections unbalanced - balanced - Digital connections - S/PDIF - AES/EBU

The serial data from the ATAPI drive is streamed into a Crystal CS8416, a Digital Audio Receiver that supports audio data with sample rates up to 192 kHz, with an extremely low jitter performance of 200ps. It has an extremely low jitter clock recovery mechanism that yields a very clean recovered clock from the incoming audio stream. The demultiplexed signal is then fed into a T.I. SRC4190. The SRC4190 is a leading edge asychronous sample rate converter, which combines a wide input-to-output sampling ratio with outstanding dynamic range and low distortion. The T.I. resamples the signal from 44.1Khz to 192 Khz, regardless of the jitter in the reception stage, and presents it to the Digital to Analog Converter, a Wolfson microelectronics WM8740. The WM8740 is a very high performance stereo DAC supporting data input word lengths from 16 to 24-bits and sampling rates up to 192kHz. The WM8740 features a multi-bit sigma delta modulator, for in a significant reduction in the high frequency, and a very well done voltage/current conversion. As the DAC provides a balanced out, the output stages are cross differential for the symmetrical output and simple differential for the RCA. The output stage uses FET on the ingress for a very low noise, and the reconstruction filters on the signal path are of the first order. The digital output use a fast line driver MC3487. A pair of Home made pair transformers isolate the symmetrical AESBU and the asymmetrical SP-DIF outputs from the power supply of the digital part and the chassis of the device. The phase inverters operate in the digital domain with no additional noise. The management of the ATAPI bus, of the graphical display and of the digital signals is performed by a MICROCHIP PIC 18F8720 microchip that can be reprogrammed from the RS 232 port on the back of the player.





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