Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain

Microphone Amplifiers with Integrated Bias

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5

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT AMPLITUDE

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.01

0.1

1

10

0.001

0

2.0

H VERSION

BW = 22Hz TO 22kHz

f = 10kHz

f = 1kHz

f = 100Hz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT AMPLITUDE

1.0

0.5

0.01

0.1

1

100

10

0.001

0

1.5

f = 10kHz

f = 100Hz

f = 1kHz

L VERSION

BW = 22Hz TO 22kHz

100

50

30

70

10

10

10k

100k

FREQUENCY (Hz)

100

INPUT-REFERRED NOISE vs. FREQUENCY

INPUTS AT AC GND

1k

BIAS NOISE vs. FREQUENCY

FREQUENCY (Hz)

10k

1k

100

100

1000

10,000

10

10

100k

OFF-ISOLATION vs. FREQUENCY

FREQUENCY (Hz)

10k

1k

100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

-100

10

100k

MAX9813

IN1 TO OUT WITH

IN2 SELECTED

Typical Operating Characteristics (continued)

unless otherwise noted.)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

FREQUENCY (Hz)

10k

1k

100

0.01

0.1

1

0.001

10

100k

Ω

BW = 22Hz TO 22kHz

Ω