Other Parts Discussed in Thread: ADC3424, VCA820, LMH6609, VCA821
Hi team,
My customer is using VCA810 to control the sine waveform amplitude, see schematic below, but they find that our device will cause a non-linear issue to the input signal. See test below, this table shows that the VCA810 will affect the input signal and reduce the Vpeak value. This effect is hard to be calibrated. Do you have any idea about how to avoid this effect? Thanks.
Input signal Vpp |
Data in ADC3424 Gain=0dB |
Data in ADC3424 without VCA810 |
1V | 783 | 843 |
0.5V | 411 | 422 |
0.25V | 211 | 212 |