Accuphase DP 57 Brochure

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Accuphase DP 57 Brochure

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S0 (Signal) e0(Conversion error) Digital inputSignal Conversion error MDS output Note the ratio between signal and conversion error. In the MDS output, the error is very small in relation to the signal. (Normal phase output) (Normal phase output) (Reverse phase output) (Reverse phase output) I (current) /V (voltage) converter Voltage summing SubtractionDAC output Analog output Digital input MDS ++ D/A converter moves another step ahead MDS (Multiple Delta Sigma) is a revolutionary design which employs several delta sigma type converters in a parallel configuration. In the combined output of these multiple converters, conversion errors cancel each other out, resulting in a drastic improvement in all relevant aspects of conver ter performance including accuracy, S/N ratio, dynamic range, linearity, and THD. In the DP-57, two delta sigma type PCM1796 converters (made by Texas Instruments) are driven in parallel. Compared to a single converter, this results in an overall performance improvement by a factor of 1.4 (= √2). As shown in the diagram, the MDS ++ used in the DP-57 features an enhanced current-to-voltage (I/V) converter for processing the D/A converter output current. In combination with voltage summing, this design results in even better stability and top-notch performance. The music emerges from a totally silent background, with breathtaking detail resolution and accurate spatial information. n nn n n MDS type D/A converter principle n n n n n Block diagram of MDS ++ converter in DP-57 n nn n nAssembly with CD transport control cir- cuitry, digital inputs, transport outputs, MDS ++ D/A converter, 3-pole analog filter, balanced/unbalanced analog output circuitry, power supply, etc. n nn n nSupplied remote commander RC-18 Offers a host of functions such as input switching, direct play, program play, repeat, etc. Linearity (digital input vs. analog output)