Описание
The FAN3850T integrates a pre-amplifier, LDO, and Analog-to-Digital Converter (ADC) to convert Electret Condenser Microphone (ECM) outputs to digital Pulse Density Modulation (PDM) data streams. The preamplifier accepts analog signals from the ECM and drives an over-sampled sigma delta ADC and outputs PDM data. The PDM digital audio has the advantage of noise rejection and interface-to-mobile handset processors. The FAN3850T is powered from the system supply rails up to 3.63V, with a low power consumption of only 0.85mW, and less than 20µW in Power-Down Mode. The device compensates for the temperature variation of the microphone element to achieve a flat sensitivity response over-temperature.
- Optimized for Mobile Handset and Notebook PC Microphone Applications
- Accepts Input from Electret Condenser Microphones
- Pulse Density Modulation (PDM) Output
- Standard 5-Wire Digital Interface
- Amplifier Gain: 15.7dB
- Negative Temperature Coefficient to Compensate for ECM Positive Temperature Coefficient
- Low Input Capacitance, High PSR, 20kHz Pre-Amplifier
- Low-Power, 1.5µA Sleep Mode
- Typical 420µA Supply Current
- Signal to Noise Ratio of 62.4dB(A)
- Total Harmonic Distortion: 0.01%
- Input Clock Frequency Range of 1-4MHz
- Integrated Low Drop-Out Regulator (LDO)
- Small 1.26mm x 0.86mm 6-Ball WLCSP
