MSM-261S4030A
Analog output MEMS microphone with -38dBV sensitivity, 64dB SNR, and ultra-low power consumption for consumer electro...
Product Overview
Description
The MSM-261S4030A is a high-performance analog MEMS microphone designed for consumer electronics applications. It features excellent audio quality with low power consumption.
With -38dBV sensitivity and 64dB SNR, this microphone delivers clear audio capture suitable for smartphones, tablets, and wearables. The analog output simplifies integration with existing audio circuits.
Ultra-low power consumption of 150uA makes this microphone ideal for battery-powered devices. The compact package and bottom-port design enable flexible integration.
Product Series
MSM
Primary Application
Smartphones and tablets
Key Features
- Ultra-low power consumption 150uA typical
- 64dB SNR for clear audio quality
- Analog output for simple integration
- Compact surface-mount package
- Bottom-port configuration
- Cost-effective for high-volume applications
Specifications
| Sensitivity | -38dBV |
|---|---|
| SNR | 64dB |
| Frequency Response | 100Hz - 10kHz |
| Current Consumption | 150uA |
| Package | 3.76 x 2.95 x 1.1mm |
| Output Type | Analog |
| Operating Temperature | -20°C to +70°C |
| Qualification | Consumer Grade |
Applications
Smartphones and tablets
Electronic system design
Wearable devices
Electronic system design
Bluetooth headsets
Electronic system design
IoT devices
Electronic system design
Consumer electronics
Consumer electronics
Toys and gadgets
Electronic system design
FAE Expert Insights
"The MSM-261S4030A is an excellent choice for cost-sensitive consumer electronics where audio quality cannot be compromised. The 150uA power consumption is among the best in its class, making it perfect for battery-powered wearables. I've used this microphone in numerous smartphone and wearable designs with consistently good results. The analog output simplifies integration - just connect to your ADC input with appropriate biasing. For best results, keep the analog trace short and away from digital switching noise. The -38dBV sensitivity works well with most codec ADCs without additional gain stages. The price-performance ratio makes this microphone very competitive against international brands. I recommend this for any consumer application where digital output isn't required."
Ultra-low power analog microphone ideal for battery-powered consumer devices
— Alex Zhang, BeiLuo
Frequently Asked Questions
What biasing circuit is needed for the analog output?
The MSM-261S4030A analog output requires proper biasing for optimal performance: 1) Supply voltage 1.5-3.6V with decoupling capacitor (100nF); 2) Output is AC-coupled through a capacitor (typically 1uF) to remove DC bias; 3) Load impedance should be >10k ohm; 4) For direct ADC connection, ensure the ADC input range matches the microphone output (typically 0.5-1.5V peak). The microphone has internal biasing circuitry, so no external bias resistor is needed. Reference circuits are provided in the application note.
Use AC coupling capacitor and ensure proper supply decoupling. Contact our FAE for specific circuit recommendations.
How do I minimize noise pickup on the analog output?
To minimize noise on the analog output: 1) Keep the analog trace as short as possible; 2) Use ground shielding around the analog trace; 3) Place the microphone away from switching regulators and digital circuits; 4) Implement proper power supply filtering; 5) Use differential routing if possible; 6) Add a small capacitor (10-100pF) at the ADC input for high-frequency noise filtering. The analog output is more susceptible to noise than digital PDM, so careful layout is essential. For noisy environments, consider the digital output version MSM-261S4030H.
Follow careful PCB layout practices. Consider digital output microphones for high-noise environments or long trace runs.
Can I use the MSM-261S4030A with a 1.8V supply?
Yes, the MSM-261S4030A operates from 1.5V to 3.6V supply, making it compatible with 1.8V systems. At 1.8V operation: 1) Sensitivity remains the same (-38dBV); 2) SNR is maintained at 64dB; 3) Current consumption is slightly reduced; 4) Output signal level scales with supply voltage. Ensure your ADC can handle the reduced output signal level at 1.8V operation. The microphone's performance specifications are guaranteed across the full supply voltage range.
The microphone works well at 1.8V. Verify your ADC input range is compatible with the reduced output signal level.
What is the startup time of the MSM-261S4030A?
The MSM-261S4030A has a fast startup time of approximately 10ms from power-on to full operation. This enables quick wake-from-sleep for voice-activated applications. The startup sequence includes: 1) Power supply stabilization (<5ms); 2) MEMS element bias settling (3-5ms); 3) Output buffer stabilization (2-3ms). For applications requiring faster response, keep the microphone powered continuously in standby mode (consumption remains low). The fast startup is advantageous for battery-powered devices using voice wake-up features.
The 10ms startup is suitable for most applications. For voice wake-up, consider continuous operation or use the fast startup capability.
How do I test the microphone during production?
Production testing for the MSM-261S4030A typically includes: 1) DC parametric test (supply current, output DC level); 2) Sensitivity test using calibrated acoustic source (1kHz at 94dB SPL); 3) Frequency response spot check; 4) SNR measurement. Memsensing provides test guidelines and can recommend acoustic test equipment. The analog output simplifies testing compared to digital microphones. Many contract manufacturers have standard test fixtures for MEMS microphones. Contact our quality team for detailed test specifications and limits.
Implement DC and acoustic testing per our production test guidelines. Contact our quality team for detailed test specifications.