You can test the ftm_pdb_adc16 demo. (C:\SDK_2.3.0_TWR-KV11Z75M\boards\twrkv11z75m\demo_apps\ftm_pdb_adc16)
Additional configuration needs to be written when PDB1 module is used:
SIM->SOPT7 |=SIM_SOPT7_ADC0ALTTRGEN(0x01)|SIM_SOPT7_ADC1ALTTRGEN(0x01);

Best Regards,
Robin
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