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TLV320ADC3101 ADC reolution

Other Parts Discussed in Thread: TLV320ADC3101EVM-K

Hi I am using the TLV320ADC3101EVM-K and have configured it in 24 bit mode however the last 8 LSB bits only seem to change from 0x00 to 0xFF, is the ADC not capable of operating with true 24 bit resolution ?

here is an example of some of the data I obtained from the ADC

f624ff00   f65f0000
f6e5ff00   f7220000
f7940000   f7ce0000
f84dff00   f884ff00
f9060000   f93dff00
f9bbff00   f9f1ff00
fa71ff00   faa8ff00
fb2eff00   fb65ff00
fbea0000   fc1dff00
fc94ff00   fcc70000
fd580000   fd8bff00
fe0bff00   fe3e0000
fec1ff00   fef20000
ff7b0000   ffacff00
0033ff00   0064ff00
00ea0000   011a0000
01a10000   01cf0000
025aff00   0288ff00
030c0000   0339ff00
03cdff00   03f90000
0484ff00   04adff00
05370000   0560ff00
05f2ff00   061e0000
06aa0000   06d2ff00
0761ff00   07890000
081c0000   08430000
08d50000   08fa0000
0988ff00   09ae0000
0a44ff00   0a69ff00
0affff00   0b230000
0bb5ff00   0bda0000
0c6e0000   0c900000
0d2dff00   0d4e0000
0de1ff00   0e020000
0e93ff00   0eb3ff00
0f550000   0f740000
1003ff00   10200000
10c10000   10de0000
117dff00   119aff00
12330000   124cff00
12f10000   130b0000
139cff00   13b70000
145cff00   14760000
15130000   152a0000
15cc0000   15e30000
16890000   169e0000
173c0000   17520000
17efff00   18030000