‡

J

A

D

-$

T

T

P

R

REF(MAX)

REF(MIN)

6

REF

V

V

Drift

10

(ppm)

V

Temperature Range

§

·

x

¨

¸

x

©

¹

-0.05

-0.04

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

0.04

0.05

±75

±50

±25

0

25

50

75

100

125

150

Temperature (

ƒC)

C001

V

REF

V

BIAS

16

REF1925, REF1930, REF1933, REF1941

SBOS697A – SEPTEMBER 2014 – REVISED JANUARY 2017

www.ti.com

Product Folder Links: REF1925 REF1930 REF1933 REF1941

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Copyright © 2014–2017, Texas Instruments Incorporated

Feature Description (continued)

The tracking accuracy is as shown in Figure 44.

Figure 44. VREF and VBIAS Tracking vs Temperature

9.3.2 Low Temperature Drift

The REF19xx is designed for minimal drift error, which is defined as the change in output voltage over

temperature. The drift is calculated using the box method, as described by Equation 3:

(3)

9.3.3 Load Current

The REF19xx family is specified to deliver a current load of ±20 mA per output. Both the VREF and VBIAS outputs

of the device are protected from short circuits by limiting the output short-circuit current to 50 mA. The device

temperature increases according to Equation 4:

where

•

TJ = junction temperature (°C),

•

TA = ambient temperature (°C),

•

PD = power dissipated (W), and

•

RθJA = junction-to-ambient thermal resistance (°C/W).

(4)

The REF19xx maximum junction temperature must not exceed the absolute maximum rating of 150°C.

9.4 Device Functional Modes

When the EN pin of the REF19xx is pulled high, the device is in active mode. The device must be in active mode

for normal operation. The REF19xx can be placed in a low-power mode by pulling the ENABLE pin low. When in

shutdown mode, the output of the device becomes high impedance and the quiescent current of the device

reduces to 5 µA in shutdown mode. See the Electrical Characteristics for logic high and logic low voltage levels.