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SM5866AS Folha de dados(PDF) 11 Page - Nippon Precision Circuits Inc |
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SM5866AS Folha de dados(HTML) 11 Page - Nippon Precision Circuits Inc |
11 / 23 page SM5866AS NIPPON PRECISION CIRCUITS INC.—11 FUNCTIONAL DESCRIPTION Analog Pins Current output pins (IOUTA, IOUTAN, IOUTB, IOUTBN) The SM5866AS generates current output A differential outputs, formed by input data in-phase signal processed by noise shaper A and then 23-level D/A conversion, and current output B differential outputs, formed by input data inverse-phase signal processed by noise shaper B and then 23-level D/A conversion. A and B differential outputs each have a in-phase output and inverse-phase output: A in-phase output on IOUTA, A inverse-phase output on IOUTAN, B in-phase output on IOUTB, and B inverse-phase output on IOUTBN. Using external circuits, outputs IOUTA and IOUTAN are added and I/V converted, and IOUTB and IOUTBN are added and I/V converted. Then, the converted signals are input to an op-amp stage to obtain the final output analog signal. Feedback resistor connection pins (RA, RB) There are internal built-in resistors connected between IOUTA and RA and between IOUTB and RB, which can be used as op-amp feedback resistors. These resistors have a resistance of approximately 6.8k Ω. An exter- nal resistor can be connected to the internal resistor, in serial or parallel, in order to adjust the analog output level. Note, however, that the internal resistance can vary by as much as ± 20% between individual LSI devices, and thus the output level may change with the difference in the ratio of internal resistance to external resis- tance. Input Mode Settings (IMD0, IMD1) IMD0 and IMD1 pin settings switch between the DSD and PCM operating modes. In DSD mode, the DSD sig- nal high-frequency components can be removed using one of DSD filters (H-Filter and G-Filter), or the signal can be left unfiltered. Figure 1. Analog outputs Table 1. Input mode setting IMD0 IMD1 Mode name Input format DSD FIR filter H H H 1bit, 64fs, DSD H-Filter H L G 1bit, 64fs, DSD G-Filter L H A 1bit, 64fs, DSD None L L D 24bit, 8fs, PCM None 23 Level DEM DAC Noise shaper A RA IOUTA 23 Level DEM DAC Noise shaper B RB IOUTB In-phase output A In-phase output B Inverse-phase output A Inverse-phase output B Data input IOUTAN IOUTBN |
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