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ADMP421BCEZ-RL Datenblatt(PDF) 4 Page - Analog Devices

Teilenummer ADMP421BCEZ-RL
Bauteilbeschribung  Omnidirectional Microphone with Bottom Port and Digital Output
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Data Sheet
ADMP421
Rev. D | Page 3 of 16
SPECIFICATIONS
TA = 25°C, VDD = 1.8 V, CLK = 2.4 MHz, unless otherwise noted. All minimum and maximum specifications are guaranteed. Typical
specifications are not guaranteed.
Table 1.
Parameter
Symbol
Test Conditions/Comments
Min
Typ
Max
Unit
PERFORMANCE
Directionality
Omni
Sensitivity1
1 kHz, 94 dB SPL
−29
−26
−23
dBFS
Signal-to-Noise Ratio
SNR
20 kHz bandwidth, A-weighted
61
dBA
Equivalent Input Noise
EIN
20 kHz bandwidth, A-weighted
33
dBA SPL
Dynamic Range
Derived from EIN and maximum acoustic input
87
dB
Frequency Response2
Low frequency −3 dB point
100
Hz
High frequency −3 dB point
15
kHz
Deviation limits from flat response within
pass band
−3/+2
dB
Total Harmonic Distortion
THD
105 dB SPL
3
%
Power Supply Rejection
PSR
217 Hz, 100 mV p-p square wave
superimposed on VDD = 1.8 V
80
dBFS
Maximum Acoustic Input
Peak
120
dB SPL
INPUT CHARACTERISTICS
Clock Frequency
CLK
1.0
2.43
3.3
MHz
Clock Duty Ratio
Clock frequency of 2.4 MHz or less
40
60
%
Input Voltage High
VIH
0.65 × VDD
V
Input Voltage Low
VIL
0.35 × VDD
V
OUTPUT CHARACTERISTICS
Output Voltage High
VOH
ILOAD = 0.5 mA
0.7 × VDD
VDD
V
Output Voltage Low
VOL
ILOAD = 0.5 mA
0
0.3 × VDD
V
Latency
<30
µs
Wake-Up Time
From sleep mode, power on
10
ms
POWER SUPPLY
Supply Voltage
VDD
1.8
3.3
V
Supply Current
IS
Normal mode
650
µA
Sleep mode4
50
µA
1
Relative to the rms level of a sine wave with positive amplitude equal to 100% 1s density and negative amplitude equal to 0% 1s density.
2
See Figure 5 and Figure 6.
3
The microphone operates at any clock frequency between 1.0 MHz and 3.3 MHz. Some specifications may not be guaranteed at frequencies other than 2.4 MHz.
4
The microphone enters sleep mode when the clock is turned off or the clock frequency is less than 1 kHz.


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