AD2428W datasheet(23/38 Pages) AD

23 / 38 page

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

Rev. B

Page 23 of 38

January 2020

Figure 28. Equivalent Device Loading for AC Measurements

(Includes All Fixtures)

Figure 29. GPIO Driver Typical Rise and Fall Times (10% to 90%) vs. Load

Capacitance (VIOVDD = 1.8 V, TJ = 25°C)

ZO = 50

(impedance)

TD = 4.04

r 1.18 ns

2pF

TESTER PIN ELECTRONICS

0.5pF

400

4pF

NOTES:

THE WORST CASE TRANSMISSION LINE DELAY IS SHOWN AND CAN BE USED

FOR THE OUTPUT TIMING ANALYSIS TO REFLECT THE TRANSMISSION LINE

EFFECT AND MUST BE CONSIDERED. THE TRANSMISSION LINE (TD) IS FOR

LOAD ONLY AND DOES NOT AFFECT THE DATA SHEET TIMING SPECIFICATIONS.

ANALOG DEVICES RECOMMENDS USING THE IBIS MODEL TIMING FOR A GIVEN

SYSTEM REQUIREMENT. IF NECESSARY, THE SYSTEM CAN INCORPORATE

EXTERNAL DRIVERS TO COMPENSATE FOR ANY TIMING DIFFERENCES.

VLOAD

DUT

OUTPUT

10152025303540

tRISE

tFALL

LOAD CAPACITANCE (pF)

DRIVE STRENGTH = 0

Figure 30. GPIO Driver Typical Rise and Fall Times (10% to 90%) vs. Load

Capacitance (VIOVDD = 1.8 V, TJ = 25°C)

Figure 31. GPIO Driver Typical Rise and Fall Times (10% to 90%) vs. Load

Capacitance (VIOVDD = 3.3 V, TJ = 25°C)

Figure 32. GPIO Driver Typical Rise and Fall Times (10% to 90%) vs. Load

Capacitance (VIOVDD = 3.3 V, TJ = 25°C)

1015202530354045

tRISE

tFALL

LOAD CAPACITANCE (pF)

DRIVE STRENGTH = 1

tRISE

tFALL

LOAD CAPACITANCE (pF)

DRIVE STRENGTH = 0

tRISE

tFALL

LOAD CAPACITANCE (pF)

DRIVE STRENGTH = 1

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