New Products, Tips and Tools for Power and Mobile Applications

Digital Microphones Improve

Sound Quality, Lower Power

Achieve better sound quality in mobile handset and notebook microphone

applications with Fairchild’s FAN3850x series of digital microphone pre-amplifiers.

These high performance analog mobile audio devices provide advanced noise

rejection capabilities as well as an easy interface to mobile handset processors.

The series includes:

• FAN3850A that features both 16dB and 19dB gain versions,

• FAN3850T offering 15dB gain and integrated negative temperature

coefficient to compensate for ECM positive temperature coefficient to

achieve a flat sensitivity response over temperature.

Both devices integrate a pre-amplifier, low drop-out regulator (LDO) and analog-

to-digital converter (ADC) that converts Electret Condenser Microphone (ECM)

outputs to digital pulse density modulation (PDM) data streams.

Advantages

• Excellentsignal-to-noiseratio

• Lowerpowercompensation,

0.8mW

• <20μWpowerdownmode

Applications

• Mobilehandsets

• NotebookPCmicrophones

For more information, please visit:

www.fairchildsemi.com/pf/FA/FAN3850A.html

www.fairchildsemi.com/pf/FA/FAN3850T.html

VOL. 1, 2012

90

0.001

0.01

0.1

1

Input Signal (mVpp)

SNR (dBa)

THD (dB)

SINAD (dB)

10

100

80

70

60

50

40

30

20

10

0

-10

-20

FAN3850T 15dB SNR (dBa), THD (-dB), SINAD (dB) over Input Amplitude

Product

Number

I

I

SNR (dB)

THD (%)

120dB SPL

THD + N

(%)

ESD (HBM)

(kV)

FAN3850x

420

1.4

62

0.01

3

7

V