ADR391(RevC) データシートの表示（PDF） - Analog Devices

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ADR391
(Rev.:RevC)

Precision Low Drift 2.048 V/2.5 V/4.096 V/5.0 V SOT-23 Reference with Shutdown

Analog Devices 

ADR390/ADR391/ADR392/ADR395

PARAMETER DEFINITION

Temperature Coefficient (TCVO)

The change of output voltage over the operating temperature

change and normalized by the output voltage at 25∞C, expressed

in ppm/∞C. The equation follows:

[ ] ( ( )) ( ( ) ) where:

VO T2 -VO T1

TCVO ppm ∞C =

¥ 106

VO 25∞C ¥ T2 - T1

VO(25∞C) = VO at 25∞C

VO(T1) = VO at temperature1

VO(T2) = VO at temperature2

Line Regulation (⌬VO/⌬VIN)

The change in output voltage due to a specified change in input

voltage. It includes the effects of self-heating. Line regulation is

expressed in either percent per volt, parts per million per volt, or

microvolts per volt change in input voltage.

Load Regulation (⌬VO/⌬ILOAD)

The change in output voltage due to a specified change in load

current. It includes the effects of self-heating. Load regulation is

expressed in either microvolts per milliampere, parts per million

per milliampere, or W of dc output resistance.

Input Capacitor

Input capacitors are not required on the ADR39x. There is no

limit for the value of the capacitor used on the input, but a 1 mF

to 10 mF capacitor on the input will improve transient response

in applications where the supply suddenly changes. An additional

0.1 mF in parallel will also help in reducing noise from the supply.

Output Capacitor

The ADR39x does not need output capacitors for stability under

any load condition. An output capacitor, typically 0.1 mF, will

filter out any low level noise voltage and will not affect the

operation of the part. On the other hand, the load transient

response can be improved with an additional 1 mF to 10 mF

output capacitor in parallel. A capacitor here will act as a source

of stored energy for a sudden increase in load current. The only

parameter that will degrade, by adding an output capacitor, is

turn-on time and it depends on the size of the capacitor chosen.

Long-Term Stability

Typical shift in output voltage over 1000 hours at a controlled

temperature. Figure 1 shows a sample of parts measured at differ-

ent intervals in a controlled environment of 50∞C for 1000 hours.

( ) ( ) DVO =VO t0 -VO t1

[ ] ( ) ( ) ( ) DVO

ppm

= VO

t0 -VO

VO t0

t1

¥ 106

where:

VO(t0) = VO at time 0

VO(t1) = VO after 1000 hours operation at a controlled

temperature

Thermal Hysteresis (VO_HYS)

The change of output voltage after the device is cycled through

temperature from +25∞C to –40∞C to +85∞C and back to

+25∞C. This is a typical value from a sample of parts put

through such a cycle.

( ) VO _ HYS = VO 25∞C - VO _TC

where:

[ ] ( ( ) ) VO _ HYS

ppm

= VO

25∞C - VO _TC

VO 25∞C

¥ 106

VO(25∞C) = VO at 25∞C

VO_TC = VO at 25∞C after temperature cycle at +25∞C to

–40∞C to +85∞C and back to +25∞C

200

DATA TAKEN IN CONTROLLED

ENVIRONMENT @ 50؇C ؎ 1؇C

150

100

50

0

؊50

؊100

؊150

0

86 176 250 324 440 640 840 1040

TIME – Hours

Figure 1. ADR391 Typical Long-Term Drift over 1000 Hours

REV. C

–5–

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