How to use PPI with nRF Connect

Are there any samples that show how to use the nRF PPI subsystem with nRF Connect? 

My task is to configure the SAADC to take samples at 200hz, collect the samples into BLE packets, and send BLE notifications.  I have this working in a project based on NRF5 and now I need to port over to NCS. With NRF5 I trigger the SAADC to take sample using the RTC and PPI subsystems. Then I use the interrupt handler (nrfx_saadc_irq_handler) to process the data. This approach saves power by allowing the SAADC to take samples without any dependency on the CPU. 

Should I try to use NRFX directly? Or do I use Zephyr APIs to use the peripherals such as PPI and SAADC? 

Using device nRF52840