The FAN3852 integrates a pre-amplifier, LDO, and ADC that converts Electret Condenser Microphone (ECM) outputs to digital Pulse Density Modulation (PDM) data streams. The pre-amplifier accepts analog signals from the ECM and drives an over-sampled sigma delta Analog-to-Digital Converter (ADC) and outputs PDM data. The PDM digital audio has the advantage of noise rejection and easy interface to mobile handset processors. The FAN3852 features an integrated LDO and is powered from the system supply rails up to 3.63V, with low power consumption of only 0.85mW and less than 20μW in Power-Down Mode.

Optimized for Mobile Handset and Notebook PC Microphone Applications
Accepts Input from Electret Condenser Microphones (ECM)
Pulse Density Modulation (PDM) Output
Standard 5-Wire Digital Interface
Low Input Capacitance, High PSR, 20 kHz Pre-Amplifier
Low-Power 1.5μA Sleep Mode
Typical 420μA Supply Current
SNR of 62dB(A) for 16dB Gain
Total Harmonic Distortion 0.02%
Input Clock Frequency Range of 1-4MHz
Integrated Low Drop-Out Regulator (LDO)
1.5kV HBM ESD on MIC Input
End Products
Electret Condenser Microphones with Digital Output
Mobile Handset
Headset Accessories
Personal Computer (PC)