Preliminary Technical Data

ADMP404

Rev. PrH | Page 3 of 12

SPECIFICATIONS

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

62

dBA

Equivalent Input Noise

EIN

32

dBA SPL

Frequency Response1

Low frequency –3 dB point

100

Hz

High frequency –3 dB point

15

kHz

Deviation from flat response within pass band

−3

+2

dB

Total Harmonic Distortion

THD

105 dB SPL

3

%

Power Supply Rejection Ratio

PSRR

217 Hz, 100 mV p-p square wave

70

dB

Maximum Acoustic Input

Peak

120

dB SPL

POWER SUPPLY

Supply Voltage

1.5

3.6

V

Supply Current

250

µA

OUTPUT CHARACTERISTICS

Output impedance

200

Ω

Output DC Offset

0.8

V

Output Current Limit

90

µA

Polarity

1

See Figure 4 and Figure 6.

2

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