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For Opus applications, is an Audio DAC chip required?

Hi, guys. I'm trying to work with Opus applications using PCA10056 v1.0. In order to play Opus fils using the nRF52840,

do I need audio DAC + audio amplifier to create sound on a 3.5mm headphone jack or 1W 8 Ohm speakers?

For instance, adding TI's TLV320DAC3101 (32-bit Low-Power Stereo Audio DAC With Stereo Class-D Speaker Amplifier) is mandatory for playing Opus files?

Or using nRF52840's PDM (Pulse density modulation interface) / PCM will do the job so that I only need the audio amplifier?

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