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CMAMP110M

Microphone Amplifier

California Micro Devices Corp 

CMAMP110

Application Information (cont’d)

t

=

RCIN

⋅

ln





-V---VS---U-S--UP----P-⁄--2--

=

0.69RCIN

For an input capacitance of 0.22µF, the turn on tran-

sient is about 76ms.

7. Evaluation Board

An evaluation board, part number CMAMP110-20EV, is

available to facilitate easy and rapid checkout of the

CMAMP110. The board is about the size of a business

card, and samples of it may obtained by calling the fac-

tory at (800) 325-4966 or (408) 263-3214 or from your

local representative. Ask the operator to be connected

to Applications Engineering. Otherwise, you may

request samples on our website at www.calmicro.com

by navigating to the ’Contact Us’ page, click on the ’Lit-

erature & Samples Request’ button and request the

above part number.

EXT

MIC

INPUT

MIC_SELECT

INT_MIC+

V+

4.7µF

0.1µF

0.22µF

0.22µF

0.22µF

4

V+

3 EXT_MIC_BIAS

VOUT 2

8 EXT_MIC_IN

0.22µF

CMAMP110

1

MIC_SELECT

CODEC

6 INT_MIC+

5 INT_MIC-

V−

7

Figure 1. CMAMP110 Typical Application Circuit (single-ended input

configuration shown for differential INT_MIC inputs).

© 2004 California Micro Devices Corp. All rights reserved.

6

430 McCarthy Blvd., Milpitas, California 95035 LTel: (408) 263-3214 L Fax: (408) 263-7846 L

www.calmicro.com 01/09/04

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