Operating Temperature Range ........................... -40°C to +85°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Bump Temperature (soldering) Reflow ............................ +235°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
DD
= 3.3V,
SHDN
= V
DD
, C
CT
= 470nF, C
CG
= 2μF, GAIN = V
DD
, T
A
= T
MIN
to T
MAX
, unless otherwise specified. Typical values
are at T
A
= +25°C.) (Note 1)
PARAMETER
GENERAL
Operating Voltage
Supply Current
Shutdown Supply Current
Input-Referred Noise Density
Output Noise
Signal-to-Noise Ratio
Dynamic Range
SNR
DR
SYMBOL
V
DD
I
DD
I
SHDN
e
n
BW = 20kHz, all gain settings
BW = 20kHz
BW = 22Hz to 22kHz
(500mV
RMS
output signal)
A-weighted
(Note 2)
f
IN
= 1kHz, BW = 20Hz to 20kHz,
R
L
= 10kΩ, V
TH
= 1V (threshold = 2V
P-P
),
V
IN
= 0.5mV
RMS
, V
CT
= 0V
f
IN
= 1kHz, BW = 20Hz to 20kHz,
R
L
= 10kΩ, V
TH
= 0.1V (threshold =
200mV
P-P
), V
IN
= 30mV
RMS
, V
CT
= 2V
1.14
1% THD
GAIN = V
DD
Maximum Gain
A
GAIN = GND
GAIN = unconnected
GAIN = V
DD
Minimum Gain
Maximum Output Level
Regulated Output Level
AGC Attack Time
Attack/Release Ratio
t
ATTACK
A/R
V
OUT_RMS
GAIN = GND
GAIN = unconnected
1% THD+N, V
TH
= MICBIAS
AGC enabled, V
TH
= 0.7V
C
CT
= 470nF (Note 3)
A/R = GND
A/R = VDD
A/R = unconnected
www.maximintegrated.com
CONDITIONS
Guaranteed by PSRR test
MIN
2.7
TYP
MAX
5.5
UNITS
V
mA
µA
nV/√Hz
µV
RMS
dB
dB
3.1
0.01
30
430
61
64
60
0.04
6
1
Total Harmonic Distortion Plus
Noise
THD+N
%
0.2
1.23
100
100
39.5
49.5
59.5
18.7
29.0
38.7
1.26
40
50
60
20
30
40
0.707
1.40
1.1
1:500
1:2000
1:4000
Maxim Integrated
│
2
Amplifier Input BIAS
Maximum Input Voltage
Input Impedance
V
IN
V
IN_MAX
Z
IN
1.32
V
mV
P-P
kΩ
40.5
50.6
60.5
20.5
30.8
40.5
V
RMS
1.54
V
P-P
ms
ms/ms
dB
dB
MAX9814
Microphone Amplifier with AGC and
Low-Noise Microphone Bias
Electrical Characteristics (continued)
(V
DD
= 3.3V,
SHDN
= V
DD
, C
CT
= 470nF, C
CG
= 2μF, GAIN = V
DD
, T
A
= T
MIN
to T
MAX
, unless otherwise specified. Typical values
are at T
A
= +25°C.) (Note 1)
PARAMETER
MICOUT High Output Voltage
MICOUT Low Output Voltage
MICOUT Bias
Output Impedance
Minimum Resistive Load
Maximum Capacitive Drive
Maximum Output Current
Output Short-Circuit Current
Z
OUT
R
LOAD_MIN
C
LOAD_MAX
I
OUT_MAX
I
SC
AGC mode; V
DD
= 2.7V to 5.5V (Note 4)
Power-Supply Rejection Ratio
PSRR
f = 217Hz, V
RIPPLE
= 100mV
P-P
(Note 5)
f = 1kHz, V
RIPPLE
= 100mV
P-P
(Note 5)
f = 10kHz, V
RIPPLE
= 100mV
P-P
(Note 5)
MICROPHONE BIAS
Microphone Bias Voltage
Output Resistance
Output Noise Voltage
Power-Supply Rejection Ratio
TRILEVEL INPUTS (A/R, GAIN)
A/R or GAIN = V
DD
A/R or GAIN = GND
Input High Voltage
Input Low Voltage
Shutdown Enable Time
Shutdown Disable Time
DIGITAL INPUT (SHDN)
SHDN
Input Leakage Current
Input High Voltage
Input Low Voltage
AGC THRESHOLD INPUT (TH)
TH Input Leakage Current
Note
Note
Note
Note
Note
1:
2:
3:
4:
5:
-1
+1
µA
Devices are production tested at T
A
= +25°C. Limits over temperature are guaranteed by design.
Dynamic range is calculated using the EIAJ method. The input is applied at -60dBFS (0.707μV
RMS
), f
IN
= 1kHz.
Attack time measured as time from AGC trigger to gain reaching 90% of its final value.
CG is connected to an external DC voltage source, and adjusted until V
中风发生时，一切都是以秒来计算的。延误治疗可能导致大脑重大损伤。伦敦大学医学院的一位博士Alistair McEwan已经获得行为医学研究所(Action Medical Research)的同意，为急救人员开发一种无线诊断系统来减少时间延误。感谢抗血栓药物，一些病人在病情发作的三个小时之内可以完全恢复。但出血也会导致中风。医生在治疗之前需要确定发病原因，因为不适当的服用抗血栓药物会加重损害。...[详细]
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