PDM Interface Module Used In Audio Testing Of Digital MEMS Microphones
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Expand audio analyzer input / output signal port
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.
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 |
