AD2428W datasheet(18/38 Pages) AD

18 / 38 page

Rev. B

Page 18 of 38

January 2020

AD2420(W)/AD2426(W)/AD2427(W)/AD2428(W)/AD2429(W)

RMS Time Interval Error (TIE) Jitter

Clocks in an A2B system are passed from the master to Slave 0,

from Slave 0 to Slave 1, and so on. Each transceiver adds self jit-

ter to the incoming jitter, which results in jitter growth from the

master to the nth slave. Table 10 illustrates typical rms TIE jitter

growth.

PDM TYPICAL PERFORMANCE CHARACTERISTICS

Figure 14 through Figure 18 and Table 11 describe typical PDM

performance characteristics.

Table 10. SYNC Output RMS TIE Jitter at Each Slave

Slave Node

Typ

Max

Unit

1.57

1.79

1.91

2.04

2.15

2.27

2.44

2.47

2.58

2.70

5.50

Figure 14. PDM FFT, fSYNCM = 48 kHz, –60 dB Frame Sync Input

–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

Figure 15. PDM Frequency Response

Figure 16. PDM Group Delay vs. Frequency, fSYNCM = 48 kHz

Figure 17. PDM Total Harmonic Distortion + Noise (THD + N) vs. Normal-

ized Frequency (Relative to fSYNCM)

–0.5

–0.4

–0.3

–0.2

–0.1

0.1

0.0001

0.001

0.01

0.1

NORMALIZED FREQUENCY (RELATIVE TO

SYNCM) (Hz)

120

100

140

160

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)

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