My customer is using ADC3683 on their products. When they input high frequency signals (sine wave, 600mVpp@1Mhz, 10Mhz,), ADC3683 can work well, with THD about -80dB. However, when input an low frequency signal (100kHz, 60kHz), the THD is only -60dB, no matter on the EVM or their own board. And we confirmed that the signal source is good, the THD is about -100dB.
Can you help to comments about this? Does ADC3683 only work for high frequency signals?
The configuration of EVM is attached.
TKs & BRs