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dCS 954 User Manual Manual for Standard Software Version 1.5x
dCS Ltd June 2000
Manual part no: DOC136954 iss 2B1
Page 48
file 135954ma2b1.pdf available from website
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Group Delay
The group delay for a dCS 904 and dCS 954 ADC and DAC were measured, at
different sample rates. The results were as below (they are valid for software up
to 1.5x):
Filter 1 Filter 2 Filter 3 Filter 4
32kS/s
1378 1378 1378 1378
44.1kS/s
1335 1335 1335 1335
48kS/s
1258 1258 1258 1258
88.2kS/s
651 651 651 651
96kS/s
530 530 530 530
176.4kS/s
253 253 253 253
192kS/s
226 226 226 226
DSD
4444
Table 9 – dCS 904 ADC Group Delay in microsecs, v1.31 software
Filter 1 Filter 2 Filter 3 Filter 4
32kS/s
1692 1710 1692 1700
44.1kS/s
1265 1262 1251 1245
48kS/s
1132 1136 1142 1150
88.2kS/s
517 238 267 191
96kS/s
414 210 224 168
176.4kS/s
129 129 129 129
192kS/s
119 119 119 119
DSD
23 23 23 23
Table 10 – dCS 954 DAC group delay in microsecs, v1.30 software
The delays were measured analogue in to analogue out for a back to back pair.
They are the same with SDIF-2 interfacing or AES interfacing. Once the pair
had been measured, the DAC group delay was measured from SDIF-2 in to
analogue out, and the ADC results inferred.