FAN3850A Datasheet, PDF (1/11 Pages) Fairchild Semiconductor – Microphone Pre-Amplifier with Digital Output

July 2011
FAN3850A
Microphone Pre-Amplifier with Digital Output
Features
ƒ Optimized for Mobile Handset and Notebook PC
Microphone Applications
ƒ Accepts Input from Electret Condenser
Microphones (ECM)
ƒ Pulse Density Modulation (PDM) Output
ƒ Standard 5-Wire Digital Interface
ƒ 16dB and 19dB Gain Versions Available⁽¹⁾
ƒ Low Input Capacitance, High PSR, 20kHz
Pre-Amplifier
ƒ Low-Power 1.5μA Sleep Mode
ƒ Typical 470μA Supply Current
ƒ SNR of 62/61dB(A) for 16/19dB Gain Respectively
ƒ Total Harmonic Distortion 0.02%
ƒ Input Clock Frequency Range of 1-4MHz
ƒ Integrated Low Drop-Out Regulator (LDO)
ƒ Small 1.26mm x 0.86mm 6-Ball WLCSP Package
Description
The FAN3850A 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 FAN3850A 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
20ȝW in Power-Down Mode.
Applications
ƒ Electret Condenser Microphones with Digital Output
ƒ Mobile Handset
ƒ Headset Accessories
ƒ Personal Computer (PC)
.
Ordering Information
Part Number
FAN3850AUC16X
FAN3850AUC19X
Operating
Temperature
Range
-30°C to +85°C
-30°C to +85°C
Package
Packing
Method
6 Ball, Wafer-Level Chip-Scale Package (WLCSP)
6-Ball, Wafer-Level Chip-Scale Package (WLCSP)
3000 Units on
Tape & Reel
3000 Units on
Tape & Reel
Note:
1. Alternate gain options are possible. Please contact Fairchild.
© 2010 Fairchild Semiconductor Corporation
FAN3850A • Rev. 3.0.6
www.fairchildsemi.com