Burr Brown PCM1738 - 24-Bit, 192kHz Sampling.pdf - MaxDat

More documents

Recommendations

Info

APPLICATION FOR MONAURAL MODE OPERATIONSingle-channel signals within stereo-audio data input isoutput to both I OUT L and I OUT R as differential outputs.Selection of channels to output is available with the CHSLbit in Register 20. Applications, such as monaural operation,are useful for high-end audio applications to provide over120dB for dynamic range. A typical MONO mode applicationis shown in Figure 12.PCM1738L/R ClockAudio DataBit ClockLRCKDATABCKI OUT L–I OUT L+I OUT R–Analog OutputStageV OUTL-ChannelSystem ClockSCKII OUT R+MC, CS, MDIPCM1738ControllerLRCKDATABCKI OUT L–I OUT L+I OUT R–Analog OutputStageV OUTR-ChannelSCKII OUT R+MC, CS, MDIFIGURE 12. Connection Diagram for Monaural-Mode Interface.28PCM1738SBAS174A
THEORY OF OPERATIONADVANCED SEGMENT DACDigitalInput24-Bit8f SUpper6 BitsMSB andLower 18 BitsICOBDecoder3rd-Order,5th-Level,∑∆0 • 62Level0 • 4Level0 • 66+AdvancedDWACurrentSegmentDACAnalogOutputFIGURE 13. Architecture of Advanced Segment DAC.The PCM1738 utilizes the newly developed Advanced SegmentDAC architecture to achieve excellent dynamic performanceand improved tolerance to clock jitter. The PCM1738provides balanced current outputs, allowing the user tooptimize analog performance externally. The structure of theAdvanced Segment DAC architecture is shown in Figure 13.Digital input data from the digital interpolation filter is splitinto six upper bits and 18 lower bits. The upper six bits areconverted to ICOB (Inverted Complementary Offset Binary)code. The lower 18 bits associated with the MSB areprocessed by fifth-level, third-order, delta-sigma modulatorsoperated at 64f S by default conditions. The first level of themodulator is equivalent to 1LSB of the above code converter.The data groups processed in the ICOB converter andthe third-order delta-sigma modulator are summed togetherto create up to 67 levels of digital code that is then processedby the DWA (Data Weighted Averaging) to reduce noiseproduced by element mismatch. The output data from theDWA block is then converted to an analog output using adifferential current segment DAC.To learn more details regarding the Advanced SegmentDAC architecture, please refer to the paper presented at the109 th AES Convention entitled “A 117db, D-Range, Current-mode,Multi-Bit, Audio DAC for PCM and DSD AudioPlayback” by Nakao, Terasawa, Aoyagi, Terada, andHamasaki of Burr-Brown Japan (now part of Texas Instruments).PCM1738 29SBAS174A
Page 2 and 3: SPECIFICATIONSAll specifications at
Page 4 and 5: V CC 1BLOCK DIAGRAMLRCKDATABCKInput
Page 6 and 7: TYPICAL PERFORMANCE CURVES (Cont.)A
Page 8 and 9: TYPICAL PERFORMANCE CURVES (Cont.)A
Page 10 and 11: ANALOG FIR FILTER PERFORMANCE FOR D
Page 12 and 13: t RSTReset Reset RemovalV DD2.4V/ma
Page 14 and 15: LRCK50% of V DDt BCH t BCL t LBBCK5
Page 16 and 17: MODE CONTROL REGISTERSUser-Programm
Page 18 and 19: REGISTER 18 (Cont.)FMT[2:0] Audio I
Page 20 and 21: REGISTER 19 (Cont.)FLTDigital Filte
Page 22 and 23: B15 B14 B13 B12 B11 B10 B9 B8 B7 B6
Page 24 and 25: APPLICATION FOR EXTERNAL DIGITAL FI
Page 26 and 27: APPLICATION FOR DSD FORMAT (DSD MOD
Page 30 and 31: CONSIDERATIONS FORAPPLICATIONS CIRC
Page 32: IMPORTANT NOTICETexas Instruments a

Burr Brown PCM1738 - 24-Bit, 192kHz Sampling.pdf - MaxDat

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?