TMS320F28034: TMS320F28034 [-PEG version 60pin] internal ADC sampling linearity question

Dear C2000 Team：

                  Customer old product used TMS320F28034PN [80PIN], the new project have selection TMS320F28034PEG[ 60pin], but the ADC linearity distortion is serious.

Test condition：

Hardware design:

1. DSP AVDD power use LDO 3.3V@0.8A ；

                  2. Ref select internal reference voltage ；

Software test：

1. 1. ADC function initializes the same code.
   2. Input signal test condition is consistent.（eg. Frequency, voltage amplitude）

Customer used to CCS function window monitor the sampling waveform separately:

Figure1 TMS320F28034 –PN 80pin：

Figure2 TMS320F28034 –PEG 60 pin：