Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
Typical Operating Characteristics (continued)
(V
CC
= 3.3V (MAX9812L/MAX9813L), V
CC
= 5V (MAX9812H/MAX9813H), GND = 0V, R
L
= 10kΩ to V
CC
/2,
SHDN
= V
CC
, T
A
= +25°C,
unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9812 toc09
MAX9812/MAX9813
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE
H VERSION
BW = 22Hz TO 22kHz
1
THD+N (%)
f = 10kHz
0.1
MAX9812 toc10
1
BW = 22Hz TO 22kHz
10
0.1
THD+N (%)
V
OUT
= 1V
RMS
R
L
= 2kΩ
0.01
V
OUT
= 1V
RMS
R
L
= 10kΩ
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.01
f = 100Hz
f = 1kHz
0.001
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT AMPLITUDE (V
RMS
)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT AMPLITUDE
MAX9812 toc11
INPUT-REFERRED NOISE vs. FREQUENCY
INPUTS AT AC GND
INPUT-REFERRED NOISE (nV/√Hz)
70
MAX9812 toc12
100
L VERSION
BW = 22Hz TO 22kHz
10
f = 1kHz
f = 10kHz
100
THD+N (%)
1
50
0.1
30
0.01
f = 100Hz
0.001
0
0.5
1.0
1.5
OUTPUT AMPLITUDE (V
RMS
)
10
10
100
1k
FREQUENCY (Hz)
10k
100k
BIAS NOISE vs. FREQUENCY
MAX9812 toc13
OFF-ISOLATION vs. FREQUENCY
0
-10
-20
CROSSTALK (dB)
-30
-40
-50
-60
-70
-80
-90
IN1 TO OUT WITH
IN2 SELECTED
MAX9813
V
IN1
= 100mV
RMS
MAX9812 toc14
10,000
10
BIAS NOISE (nV/√Hz)
1000
100
10
10
100
1k
FREQUENCY (Hz)
10k
100k
-100
10
100
1k
FREQUENCY (Hz)
10k
100k
_______________________________________________________________________________________
5
DALLAS [ DALLAS SEMICONDUCTOR ]
