ADMP421 datasheet(3/16 Pages) AD

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ADMP421

Rev. 0 | 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

dBA

Equivalent Input Noise

EIN

20 kHz bandwidth, A-weighted

dBA SPL

Frequency Response2

Low frequency −3 dB point

100

High frequency −3 dB point

kHz

Deviation from flat response within pass band

−3

Total Harmonic Distortion

THD

105 dB SPL

Power Supply Rejection Ratio

PSRR

217 Hz, 100 mV p-p square wave superimposed

on VDD = 1.8 V

dBFS

Maximum Acoustic Input

Peak

120

dB SPL

INPUT CHARACTERISTICS

Clock

CLK

2.43

MHz

Supply Voltage

VDD

1.65

3.6

Supply Current

Normal mode

650

μA

Sleep mode

μA

OUTPUT CHARACTERISTICS

Output Voltage High

VOH

VDD

Output Voltage Low

VOL

Latency

<30

μs

Wake-Up Time

From sleep mode, power on

Polarity

Noninverting4

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 Positive going (increasing) pressure on the membrane results in an increase in the number of 1s at the output.

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