Data Sheet

ADMP621

SPECIFICATIONS

guaranteed. Typical specifications are not guaranteed.

Table 1.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

PERFORMANCE

Directionality

Omni

Output Polarity

Input acoustic pressure vs. output data

Inverted

Sensitivity1, 2

1 kHz, 94 dB SPL

−48

−46

−44

dBFS

Signal-to-Noise Ratio (SNR)

20 Hz to 20 kHz, A-weighted

65

dBA

Equivalent Input Noise (EIN)

20 Hz to 20 kHz, A-weighted

29

dBA SPL

Acoustic Dynamic Range

Derived from EIN and acoustic overload point

104

dB

Digital Dynamic Range

Derived from EIN and full-scale acoustic level

111

dB

Frequency Response3

Low frequency −3 dB point

45

Hz

High frequency −3 dB point

>20

kHz

Total Harmonic Distortion (THD)

105 dB SPL

0.35

1

%

Power Supply Rejection (PSR)

217 Hz, 100 mV p-p square wave superimposed

−100

dBFS

Power Supply Rejection—Swept Sine

1 kHz sine wave

−113

dB

Acoustic Overload Point

10% THD

133

dB SPL

Full-Scale Acoustic Level

0 dBFS output

140

dB SPL

POWER SUPPLY

1.62

3.63

V

Normal Mode

1.2

1.5

mA

1.3

1.6

mA

Sleep Mode4

5.5

µA

8

µA

DIGITAL INPUT/OUTPUT CHARACTERISTICS

V

V

V

0

V

Output DC Offset

Percent of full scale

3

%

Latency

<30

µs

Noise Floor

20 Hz to 20 kHz, A-weighted

−111

dBFS

1

Sensitivity is 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

The ±2 dB sensitivity specification is valid for CLK = 3.072 MHz. At lower clock frequencies, the minimum and maximum specifications are −49 dBFS and −43 dBFS,

respectively.

3

See Figure 6 and Figure 7.

4

The microphone enters sleep mode when the clock frequency is less than 1 kHz.

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