MAX9812/MAX9813
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain
Microphone Amplifiers with Integrated Bias
ELECTRICAL CHARACTERISTICS (continued)
(V
= 3.3V, I
= 500µA (MAX9812L/MAX9813L), V
= 5V, I
= 800µA (MAX9812H/MAX9813H), V
= 0V, R = open,
GND
L
CC
BIAS
CC
BIAS
SHDN = V , T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
CC
A
MIN
PARAMETER
Amplifier Input Voltage-Noise
Density
SYMBOL
CONDITIONS
Inputs at AC GND f = 1kHz
MIN
TYP
MAX
UNITS
e
40
nV/√Hz
n
n
Total Integrated Input Noise
V
22Hz to 22kHz BW, inputs at AC GND
5
µV
RMS
1kHz
75
60
Input referred, MAX9813
only
Off-Isolation
dB
%
10kHz
V
= 1V
OUT
(L version)
P-P
0.04
f = 1kHz, R = 10kΩ to
L
Total Harmonic Distortion Plus
Noise
V
/2, BW = 22Hz to
CC
THD+N
V
= 4V
OUT
(H version)
P-P
22kHz
0.015
BIAS
MAX9812L/MAX9813L
MAX9812H/MAX9813H
2.1
3.6
2.30
4.0
0.1
80
2.55
4.4
Bias Output Voltage Range
Bias Output Resistance
V
V
BIAS
R
Ω
BIAS
DC, T = +25°C
A
70
f = 217Hz
80
Power-Supply Rejection Ratio
PSRR
dB
BIAS
(V
CC
to BIAS)
f = 1kHz
75
f = 10kHz
55
BIAS Current Limit
I
BIAS short to GND
No sustained oscillations
22Hz to 22kHz BW
5
22
50
mA
pF
BIAS_SC
BIAS Capacitive-Load Stability
Total Integrated BIAS Noise
DIGITAL INPUTS (SHDN, IN1/IN2)
Logic-Low Threshold
C
50
BIAS
V
29
µV
RMS
n
V
0.8
1
V
V
IL
IH
IN
Logic-High Threshold
V
2.0
Logic Input Current
I
SHDN = GND or V
µA
CC
Shutdown Enable Time
t
95% of settled value
10
ms
SHDN_ON
Shutdown Disable Time
t
50
10
µs
µs
SHDN_OFF
IN1/IN2 Select Time
t
SEL
Note 1: All specifications are 100% tested at T = +25°C. Temperature limits are guaranteed by design.
A
3
Maxim Integrated
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
