I bought the demo board DC1996A-A (LTC2323-16) and the PScope board (DC890B) to evaluate the ADC part LTC2323-16.
According to the datasheet, I expect the following performance measurement from the ADC.
But I have seen different performances. See the following Pscope Pics.
Picture One:
Input Signal
1-Input Signal= 0 to 4Volt Peak to Peak
2- Input Signal Frequency=1Mhz
Measurement
SNR=59.86 dB
SIND= 50.68 dB
THD=-51.24 dB
ENOB=8.13 bits
Flor= -102.74 dBFS
Picture Two:
Input Signal
1-Input Signal= 0 to 4Volt Peak to Peak
2- Input Signal Frequency=2Mhz
Measurement
SNR=59.78 dB
SIND= 48.29 dB
THD=--48.61 dB
ENOB=7.73 bits
Flor= -102.34 dBFS
Conclusion:
Comparing the datasheet performance graph to the Two PScope photo shows a discrepancy in the measurement, clearly showing worse results.
If compare two Pscope pics, You will observe increasing the analog input frequency ( 1Mhz to 2Mhz), and measurement results are getting worse.
Please help me with how I can get the same performance mentioned in the datasheet and why the discrepancy in the measurement.
Test Setup
