ADA4177-2ARMZ-R7 datasheet(30/33 Pages) AD

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ADA4177-1/ADA4177-2/ADA4177-4

Data Sheet

Rev. E | Page 30 of 33

The ADA4177-1/ADA4177-2/ADA4177-4 have extremely low

long-term drift, as shown in Figure 97. The red, blue, and green

traces show sample units. Note that the ADA4177-1/ADA4177-2/

ADA4177-4 have a mean drift over 10,000 hours of less than

2 µV, or 2% of their maximum specified offset voltage of 60 µV

at room temperature.

TIME (Hours)

–8

–6

–4

–2

MEAN

MEAN PLUS ONE STANDARD DEVIATION

MEAN MINUS ONE STANDARD DEVIATION

VSY = 10V

27 UNITS

TA = 25°C

SAMPLE 1

SAMPLE 2

SAMPLE 3

Figure 97. Measured Long-Term Drift of the ADA4177-1/ADA4177-2/

ADA4177-4 Offset Voltage over 10,000 Hours

TEMPERATURE HYSTERESIS

In addition to stability over time as described in the Long-Term

Drift section, it is useful to know the temperature hysteresis,

that is, the stability vs. cycling of temperature. Hysteresis is an

important parameter because it tells the system designer how

closely the signal returns to its starting amplitude after the

ambient temperature changes and subsequent return to room

temperature. Figure 98 shows the change in input offset voltage

as the temperature cycles three times from room temperature to

+125°C to −40°C and back to room temperature. The dotted

line is an initial preconditioning cycle to eliminate the original

temperature induced offset shift from exposure to production

solder reflow temperatures.

In the three full cycles, the offset hysteresis is typically only 2 µV, or

less than 2% of its 120 µV maximum offset voltage over the full

operating temperature range. The histogram in Figure 99 shows

that the hysteresis is larger when the device is cycled through

only a half cycle, from room temperature to hot 125°C and back

to room temperature.

TEMPERATURE (°C)

–40

–20

100

120

–80

–60

–20

–40

VSY = 10V

PRECONDITION

CYCLE 1

CYCLE 2

CYCLE 3

Figure 98. Change in Offset Voltage over Three Full Temperature Cycles

OFFSET VOLTAGE HYSTERESIS (µV)

–18

–15 –12

–9

–6

–3

VSY = 10V

27 UNITS × 3 CYCLES

HALF CYCLE = +26°C, +125°C, +26°C

FULL CYCLE = +26°C, +125°C, +26°C, –40°C, +26°C

HALF CYCLE

FULL CYCLE

Figure 99. Histogram Showing the Temperature Hysteresis of the Offset

Voltage over Three Full Cycles and over Three Half Cycles

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