Rainbow Electronics MAX9814 - Manual (Page 4)

MAX9814
Microphone Amplifier with AGC and
Low-Noise Microphone Bias
4 _______________________________________________________________________________________
Typical Operating Characteristics
(V DD = 5V, C CT = 470nF, C CG = 2.2µF, V TH = V MICBIAS x 0.4, GAIN = V DD (40dB), AGC disabled, no load, R L = 10kΩ, C OUT = 1µF,
T
A
= +25°C, unless otherwise noted.)
GAIN vs. FREQUENCY
MAX9814 toc01
FREQUENCY (Hz)
GAIN (dB)
10k 1k 100
10
20
30
40
50
60
70
80
0
10 100k
GAIN = UNCONNECTED
GAIN = 0
GAIN = 1
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9814 toc02
FREQUENCY (Hz)
PSRR (dB)
10k 1k 100
-70
-60
-50
-40
-30
-20
-10
0
-80
10 100k
V RIPPLE = 200mV P-P
MICBIAS POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9814 toc03
FREQUENCY (Hz)
PSRR (dB)
10k 1k 100
-100
-90
-80
-70
-60
-50
-40
-30
-110
10 100k
V RIPPLE = 200mV P-P
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9814 toc04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.5 5.0 4.0 4.5 3.5 3.0
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
2.5
2.5 6.0
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX9814 toc05
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (nA)
5.5 5.0 4.5 4.0 3.5 3.0
0.1
0.2
0.3
0.4
0.5
0
2.5 6.0
MICROPHONE BIAS VOLTAGE
vs. MICROPHONE BIAS SOURCE CURRENT
MAX9814 toc06
I MICBIAS (mA)
V
MICBIAS
VOLTAGE (V)
25 20 15 10 5
0.5
1.0
1.5
2.0
2.5
0
0 30
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9814 toc07
FREQUENCY (Hz)
THD+N (%)
10k 1k 100
0.1
1
10
0.01
10 100k
V OUT = 800mV RMS
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE
MAX9814 toc08
OUTPUT VOLTAGE (V RMS )
THD+N (%)
1.0 0.5
0.1
1
10
0.01
0 1.5
f IN = 300Hz, 1kHz,
and 3kHz
f IN = 10kHz
INPUT-REFERRED NOISE
vs. FREQUENCY
MAX9814 toc09
FREQUENCY (kHz)
INPUT-REFERRED NOISE (
µ
V
RMS
/√
Hz)
10 1 0.1
100
10
0.01 100
1000
1
MICIN AC-COUPLED
TO GND