APx PDM 16 Input Module for B Series: Specifications 71
PDM 16
PDM 16 input module specifications
with APx500 v5.0.3 or higher measurement software
as fitted in APx517, 52x, 555 and 58x B Series audio analyzers
NP0020.00046 rev 000
November 2019
This illustration shows the PDM 16 module, model 243, and PDM 16 remote interface
pod.
The PDM 16 option provides a solution for addressing circuits or devices with multiple PDM
outputs. The PDM 16 option provides up to 16 acquisition channels that connect through the
module’s PDM 16 remote interface pod. All 16 channels can be measured simultaneously to
provide sample-accurate interchannel information. The input accepts 1-bit PDM bitstreams,
which are then decimated by one of several available decimation ratios and filtered into base-
band audio at the Decimated Rate. The PDM 16 also provides a variable Vdd supply (0.0 V-
3.6 V, 50 mA max.) and a bit clock that can be configured as an input or an output.
The PDM 16 remote interface pod provides a 40-pin, 0.1" (2.54mm) pitch IDC connector as
an interface to PDM MEMS microphones. All signal pins are provided with individual, shared
grounds. All clock outputs are redundant but individually buffered to drive multiple clock
inputs if required. The Vdd output provides DC power, if required, for the device under test.
The 8 data input pins can be used to interface up to 16 microphones simultaneously. The input
is compatible with commonly available IDE / parallel ATA I/O cables.
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