INMP621

Note 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.

Note 3: See Figure 4 and Figure 5.

Note 4: The microphone enters sleep mode when the clock frequency is less than 1 kHz.

TABLE 2. TIMING CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

NOTES

SLEEP MODE

Sleep Time

Time from CLK falling < 1

kHz

30

µs

1

Wake-Up Time

Time from CLK rising > 1

kHz to output within 3 dB

of final sensitivity, power

on

10

ms

1

INPUT

Input clock period

270

1000

ns

Clock Frequency (CLK)

1.0

3.072

3.6

MHz

1

Clock Duty Cycle

40

60

%

OUTPUT

DATA1 (right) driven after

falling clock edge

31

ns

DATA1 (right) disabled after

rising clock edge

5

23

ns

DATA2 (left) driven after

rising clock edge

31

ns

DATA2 (left) disabled after

falling clock edge

5

26

ns

Note 1: The microphone operates at any clock frequency between 1.0 MHz and 3.6 MHz. Some specifications may not be guaranteed at frequencies other than 3.072 MHz.

TIMING DIAGRAM

Figure 1. Pulse Density Modulated Output Timing

CLK

DATA2

DATA1

Page 5 of 20

Document Number: DS-INMP621-00

Revision: 1.0.

Rev Date: 02/06/2014