INMP421BCEZ-R0 datasheet(4/21 Pages) TDK

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INMP421

SPECIFICATIONS

TABLE 1. ELECTRICAL CHARACTERISTICS

(TA = −40 to 85°C, VDD = 1.8 to 3.3 V, CLK = 2.4 MHz, CLOAD = 30 pF, unless otherwise noted. All minimum and maximum specifications

are guaranteed across temperature, voltage, and clock frequency specified in Table 1, unless otherwise noted. Typical specifications

are not guaranteed.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

NOTES

PERFORMANCE

Directionality

Omni

Sensitivity

1 kHz, 94 dB SPL

−29

−26

−23

dBFS

Signal-to-Noise Ratio (SNR)

20 Hz to 20 kHz, A-weighted

dBA

Equivalent Input Noise (EIN)

20 Hz to 20 kHz, A-weighted

dBA SPL

Dynamic Range

Derived from EIN and

maximum acoustic input

Frequency Response

Low frequency −3 dB point

100

High frequency −3 dB point

kHz

Total Harmonic Distortion (THD)

105 dB SPL

Power-Supply Rejection (PSR)

217 Hz, 100 mVp-p square

wave superimposed on VDD =

1.8 V

−80

dBV

Maximum Acoustic Input

Peak

120

dB SPL

POWER SUPPLY

Supply Voltage (VDD)

1.62

3.63

Supply Current (IS)

VDD = 1.8 V

Normal

Mode

650

µA

Sleep Mode

µA

DIGITAL INPUT/OUTPUT CHARACTERISTICS

Input Voltage High (VIH)

0.65 x

VDD

Input Voltage Low (VIL)

0.35 x

VDD

Output Voltage High (VOH)

ILOAD = 0.5 mA

0.7 x

VDD

Output Voltage Low (VOH)

ILOAD = 0.5 mA

0.3 x

VDD

Latency

<30

µs

Noise Floor

20 Hz to 20 kHz, A-weighted

−87

dBFS

Note 1: Relative to the RMS level of sine wave with positive amplitude equal to 100% logical 1s density and negative amplitude equal to 0% logical 1s density.

Note 2: See Figure 4 and Figure 5.

Note 3: The microphone enters sleep mode when the clock frequency is less than 1 kHz.

Page 4 of 21

Document Number: DS-INMP421-00

Revision: 1.0.

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