AD2437 datasheet(28/42 Pages) AD

28 / 42 page

Rev. 0

Page 28 of 42

July 2023

AD2437

POWER-UP SEQUENCING RESTRICTIONS

There are no power-up sequencing restrictions. The transceiver

remains in the reset state until all of the supplies (VIN, IOVDD,

DVDD, and TRXVDD) power up. Additionally, the hardware

reset pin can be deasserted once all of the power domains are

stable. To avoid damage to the input pins, VIOVDD must be

within specification before the external devices drive the input

signals, except the SCL and SDA pins.

PDM TYPICAL PERFORMANCE CHARACTERISTICS

Figure 22 through Figure 26 and Table 16 describe typical PDM

performance characteristics.

Figure 22. PDM FFT, fSYNCM = 48 kHz, –60 dBFS Input

Figure 23. PDM Frequency Response (fSYNCM = 48 kHz)

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

–110

–120

–130

–140

–150

–160

–170

–180

–190

FREQUENCY (Hz)

100

10k

20k

CH1

CH2

0.5

–3.0

–2.5

–2.0

–1.5

–1.0

–0.5

0.1

FREQUENCY (kHz)

HPF CUT-OFF FREQ = 120Hz

HPF CUT-OFF FREQ = 240Hz

HPF CUT-OFF FREQ = 60Hz

HPF CUT-OFF FREQ = 1Hz

NO HPF

Figure 24. PDM Group Delay vs. Frequency, fSYNCM = 48 kHz

Figure 25. PDM Total Harmonic Distortion (THD)

vs. Normalized Frequency (Relative to fSYNCM)

Figure 26. PDM Out of Band Frequency Response (fSYNCM = 48 kHz)

130

110

150

170

FREQUENCY (Hz)

100

10k

100k

0.0001

0.001

0.01

0.1

–140

–120

–100

–80

–60

–20

–40

NORMALIZED FREQUENCY (RELATIVE TO

fSYNCM) (Hz)

–20

–40

–60

–80

–100

–120

–140

–160

FREQUENCY (MHz)

00.5

1.0

1.5

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