MEMS / PDM
A HIGH PERFORMANCE PDM INPUT FOR ANY AUDIO ANALYZER
DCC-1448 for R&D
Simple, transparent digital audio connectivity: Connects to any software based analyzer via USB or use SPDIF to add PDM to an existing hardware-based analyzer
High performance 24 bit converter with full control over parameters and clock for PSRR and other interface-specific tests
Acoustically silent for placement in anechoic chambers
PQC-3048 for QC
Ruggedized for production environments
Simplified connectors for increased throughput and zero setup errors. USB for power and control, and a pluggable phoenix connector to interface with the device under test
Ready for integration into an automated test sequence; delivers exact same results as R&D model for greatest possible QC assurance
PDM 1 bit digital audio to 24-bit PCM
Portland Tool & Die PDM interfaces add a high performance PDM input to any audio analyzer, enabling comprehensive characterization of MEMS (Micro-Electro-Mechanical-Systems) microphones and other devices with a 1-bit PDM (Pulse Density Modulation) output.
Typically seen in modern smartphones, MEMS microphones are becoming more and more popular due to their low cost, but without a PDM input, engineers have been forced to make their measurements in the analog domain using homemade jigs that were at best incomplete, and at worst completely unreliable.
With PT&D interfaces, conversion from the 1-bit PDM signal to a 24-bit PCM signal occurs entirely in the digital domain for maximum fidelity, and the units are completely acoustically silent, making them ideal for using inside an anechoic chamber ( a useful feature since MEMS microphones can only drive a short cable).
Both models can connect with two microphones simultaneously. In the R&D lab, this is useful for evaluating matched pairs of mics or characterizing finished products. On the production line, it enables faster test throughput.
Special Interface-specific tests
In addition to converting the MEMS microphone’s 1-bit PDM output to a 24-bit, 48kHz PCM signal, the R&D model also includes features to measure characteristics unique to MEMS microphones. These include a programmable clock for measuring performance relative to sample rate, a programmable power supply for measuring performance relative to supply voltage and a power supply rejection impairment generator for measuring power supply rejection ratio (PSRR).
Fully compatible with any audio analyzer
All PT&D interfaces support high quality USB audio streaming. Depending on the model, PT&D interfaces can also connect via SPDIF. USB is ideal for software based analyzers such as Listen Soundcheck. For hardware-based analyzers such as an AP 2700 Series or Rohde & Schwarz UPV, SPDIF or USB audio can be used.
AUDIO CONNECTIVITY OPTIONS
USB AUDIO
Appears in OS like any other USB external audio interface. Ideal for software-based analyzers like Listen SoundCheck or hardware analyzers that can access USB audio streams. Mac or Windows.
[Supported on all models]
SPDIF AUDIO
Offers more flexibility in handling audio data streams than USB. Ideal for hardware-based analyzers with a DIO or connection to software-based analyzers that use an ASIO-supported external audio interface.
[Supported on DCC-1448 for R&D only]
CONTROL OPTIONS
WINDOWS CONTROL APP
Control every parameter from the command line. Integrate into a master test application, or call from your analyzer control software. Appears natively within Listen SoundCheck.
[Supported on all models]
TOUCHSCREEN
Access every parameter directly from the front panel for on-the-fly configuration changes or troubleshooting. Save test setups to on-board memory.
[Supported on DCC-1448 for R&D only]
SPECIFICATIONS
DCC-1448 | PQC-3048 |
|
|---|---|---|
| PDM Data Input | 500 kHz to 4 MHz sample rate Mono or Stereo multiplex 1.5 to 5.5 V logic level Selectable 5, 50, 100, 200, or 400 pF input capacitance Selectable open or closed circuit BNC Connector | 500 kHz to 4 MHz sample rate Mono or Stereo multiplex |
| PDM Data Output | 24 bit, 48 kHz sample rate USB Audio – Windows and Mac compatible | 24 bit, 48 kHz sample rate USB Audio – Windows and Mac compatible |
| Data input | On/Off | Always On |
| Selectable Capacitance | 5, 50, 100, 200 or 400 pF | 5 pF Fixed |
| Interface | SPDIF, USB | USB Only |
| Vdd DC Power Supply | 0 to 5.5 V DC 10 mAmp current limit Selectable power supply rejection impairment waveform generator Sine or Square waveform 20 to 20 kHz frequency 0 to 1 Vpp AC waveform amplitude Banana style binding post style connector | 0 to 3.3 V DC 10 mAmp current limit |
| PSR Impairment Generator | Sine or Square waveform, 20 Hz - 20 kHz, 0 - 1 Vpp waveform amplitude | No |
| Control Interface | Touchscreen, USB | USB Only |
| Dimensions (H x W x D) | 86mm x 271mm x 211mm | 30mm x 64mm x 135mm |
| Weight | 1.6 kg | 0.18kg |
| Power | 12 VDC, 24W power input supplied with universal 100 to 240 VAC, 50 to 60 Hz power supply | USB Bus powered |
MISSION
PT&D outfits engineers with high-performance digital audio interfaces for audio R&D, design verification, and quality control.
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Designed and manufactured in Portland, Oregon
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Portland Tool & Die
3252 NW Bauer Woods Dr
Portland, OR, 97229