The VL voltage is 3.3V, and if the SDO voltage is checked before SPI communication, it is output as 3.3V. It is a natural result because it is pulled up to 3.3V with VL inside the IC.
However, during actual SPI communication, even if 3.3V waveform is applied to SDI, 2.6V waveform is output to SDO. If normal, 3.3V waveform should be output, please check with HQ regarding this.
For third parties, the same circuit outputs a normal waveform.
1. ADGS1414D Daisy chain waveform ( Input waveform (green CLK, yellow SDI)
1-1. Output waveform (green CLK, yellow SDO)
2. TI Product Daisy chain waveform (Input waveform (green CLK, yellow SDI))
2-1. Output waveform (green CLK, yellow SDO)
During Daisy chain operation, SDO should be toggled to 3.3V, but SDO of all ICs is toggled to 2.6V.
There is originally a pull-up resistance inside the IC, so there is no external pull-up resistance
