ADMP404 datasheet(3/12 Pages) AD

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Preliminary Technical Data

ADMP404

Rev. PrH | Page 3 of 12

SPECIFICATIONS

TA = 25°C, VDD = 1.8 V, 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

Sensitivity

1 kHz, 94 dB SPL

−41

−38

−35

dBV

Signal-to-Noise Ratio

SNR

dBA

Equivalent Input Noise

EIN

dBA SPL

Frequency Response1

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

Maximum Acoustic Input

Peak

120

dB SPL

POWER SUPPLY

Supply Voltage

VDD

1.5

3.6

Supply Current

250

µA

OUTPUT CHARACTERISTICS

Output impedance

ZOUT

200

Output DC Offset

0.8

Output Current Limit

µA

Polarity

Noninverting2

See Figure 4 and Figure 6.

Positive going (increasing) pressure on the membrane results in a positive going (increasing) output voltage.

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