7 Parameter Measurement Information

7.1 Temperature Drift

The REF54 is designed and tested for a minimal output voltage temperature drift, which is defined as the change

in output voltage over temperature. Every unit shipped is tested at multiple temperatures to make sure that the

product meets data sheet specifications. The temperature coefficient is calculated using the box method in which

a box is formed by the min/max limits for the nominal output voltage over the operating temperature range.

REF54 device C variant has maximum temperature coefficient of 0.5 ppm/°C from 0°C to 70°C and REF54

device Q1 variant has maximum temperature coefficient of 1.5 ppm/°C from -40°C to 125°C. The box method

specifies limits for the temperature error but does not specify the exact shape and slope of the device under

test. Due to temperature curvature correction to achieve low-temperature drift, the temperature drift is expected

to be non-linear. See SLYT183 for more information on the box method. The box method equation is shown in

Equation 1:

REF(MAX)

REF(MIN)

6

REF(25 C)

V

V

Drift

10

V

Temperature Range

q

§

·

u

¨

¸

¨

¸

u

©

¹

(1)

Temperature (

C)

0

10

20

30

40

50

60

70

-100

-60

-20

20

60

100

Figure 7-1. Output Voltage Vs Free-Air Temperature

REF54

SNVSCN7 – NOVEMBER 2023

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