FAN3850T Datasheet | Fairchild Semiconductor

Features - 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: 15.7d B - Negative Temperature Coefficient to pensate for ECM Positive Temperature Coefficient - Low Input Capacitance, High PSR, 20k Hz Pre-Amplifier - Low-Power, 1.5µA Sleep Mode - Typical 420µA Supply Current - Signal to Noise Ratio of 62.4d B(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 Applications - Electret Condenser Microphones with Digital Output - Mobile Handsets - Headset Accessories - Personal puters (PC) Description 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 0.85m W, and less than 20μW in Power-Down Mode. The device pensates for the temperature variation of the microphone element to achieve a flat sensitivity response over-temperature. Sleep Mode Ctrl INPUT Pre-Amp -  ADC Figure 1. Block Diagram CLOCK DATA SELECT Ordering Information Part Number Gain Operating Option Temperature...