APx PDM I/O Module for B Series: Specifications 79
PDM
PDM input/output module specifications
with APx500 v5.0 or higher measurement software
as fitted in APx517, 52x, 555 and 58x B Series audio analyzers
NP0020.00036 rev 002
March, 2020
This illustration shows the PDM module, model 236.
The PDM option provides a complete solution for addressing circuits or devices with a PDM
input or output. The PDM signal output consists of an APx generator audio signal, interpo-
lated by a broad choice of oversampling ratios, and modulated into a 1-bit PDM bitstream. A
4th-order modulator is the default; a 5th-order modulator can be selected. The PDM Option
also provides a signal input with its associated clock connection. The input accepts a 1-bit
PDM bitstream, which is then decimated by one of a wide range of decimation ratios and fil-
tered into baseband audio at the Decimated Rate. The input bitstream can also be analyzed
directly (before decimation) in the Signal Analyzer to view out-of-band components.
These specifications cover the digital input and output functions of the Audio Precision PDM
interface for the current version, model 236.
PDM specifications begin on the next page.
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