I have bought the evaluation board of AD9629-20 and I want to measure it under standalone mode.
I have set the Jumper as shown below:
J203: Pin 1 to Pin 2 (MODE_OR to LED)
J302: Pin 8 No Jumper (Standalone mode)
Pin 2 No Jumper (Default Mode)
Pin 5 No Jumper (Offset Binary)
J605: Pin 1 to pin 2 ( internal oscillator)
J201 : Pin 2 to Pin 3 (internal 1V reference)
J202: No jumper.
The analog input signal is set as the 1MHz sine wave with 1Vpp and 0.5Voffset
(1) Setup both inputs to VCM, default output code should be 1000-0000-0000, but output reveals 1111-1111-1x11
bit 3 of LSB keeps toggling ? Does any hardware configuration I miss so that ADC outputs wrong code ?
(2) If single end sine wave is given from SMA , output code reveals wrong waveform, it appears like a sine wave but MSB code is inverted.