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PDM Interface Module used in audio testing of digital MEMS microphones

Expand audio analyzer input / output signal port

USD 2,140.00

 

 

Pulse modulation PDM can transmit signals by modulating the density of pulses, and it is often used in audio testing of digital MEMS microphones.

The PDM module is an optional module of the audio analyzer, which is used to expand the test interface and functions of the audio analyzer.


Main Performance

Product Tags

performance parameters

performance
SNR < 129 dB (20 kHz BW, no waves )
Total Harmonic Distortion Plus Noise < -130 dB (20 kHz BW, no wave )
Dynamic Range  <137db(AES 17,CCIR-RMS)
flatness ±0.002dB (20Hz ~ 20kHz, 32x )±0.001dB (20Hz ~ 20kHz, 64x, 128x, 256x, 512x)
ratio 4x, 32x, 64x, 128x, 256x, 512x
Phase Alignment Between Channels All channels are sampled synchronously from a common clock with the same phase
signal type Sine wave, dual-frequency sine wave, out-of-phase sine wave, square wave signal, frequency sweep signal, noise signal, WAVE file
Signal frequency range 0.1Hz ~ 21kHz
interface
Sample rate range 4 kHz ∽216 kHz
bit clock range 128 kHz ∽ 24.576 MHz
oversampling rate 32, 64, 128, 256
edge mode Single channel up; dual channel down
Vdd output voltage 0.0 ∽ 3.6 V, Maximum 15 mA
Voltage Measurement Accuracy 0.001dB
logic level interface 0.8 V ∽ 3.3 V

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