400ms/div

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OUTMAX

OUTMIN

OUT

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V

Drift

x 10 (ppm)

V

x Temperature Range

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11

REF3112-Q1, REF3120-Q1, REF3125-Q1

REF3130-Q1, REF3133-Q1, REF3140-Q1

www.ti.com

SBVS299 – APRIL 2017

Product Folder Links: REF3112-Q1 REF3120-Q1 REF3125-Q1 REF3130-Q1 REF3133-Q1 REF3140-Q1

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Copyright © 2017, Texas Instruments Incorporated

Feature Description (continued)

Supply voltages below the specified levels can cause the REF31xx-Q1 to momentarily draw currents greater

than the typical quiescent current. This can be prevented by using a power supply with a fast rising edge and low

output impedance.

8.3.2 Thermal Hysteresis

Thermal hysteresis for the REF31xx-Q1 is defined as the change in output voltage after operating the device at

25°C, cycling the device through the specified temperature range, and returning to 25°C. It can be expressed as:

Where:

range of –40°C to +125°C and returned to 25°C.

(1)

8.3.3 Temperature Drift

The REF31xx-Q1 is designed to exhibit minimal drift error, defined as the change in output voltage over varying

temperature. The drift is calculated using the box method, which is described in Equation 2:

(2)

The REF31xx-Q1 features a typical drift coefficient of 5 ppm from 0°C to 70°C, the primary temperature range for

many applications. For the industrial temperature range of –40°C to +125°C, the REF31xx-Q1 family drift

increases to a typical value of 10 ppm.

8.3.4 Noise Performance

Typical 0.1-Hz to 10-Hz voltage noise can be seen in Figure 21. The noise voltage of the REF31xx-Q1 increases

with output voltage and operating temperature. Additional filtering may be used to improve output noise levels,

although take care to ensure the output impedance does not degrade the AC performance.

Figure 21. 0.1-Hz to 10-Hz Noise