Temperature (°C)

-50

-25

0

25

50

75

100

125

71

71.5

72

72.5

73

73.5

74

74.5

75

D004

Temperature (°C)

-40

-15

10

35

60

85

110 125

2

2.1

2.2

2.3

2.4

2.5

2.6

D013

19

REF2125

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SBAS798 – SEPTEMBER 2017

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Copyright © 2017, Texas Instruments Incorporated

Best performance and stability is attained with low-ESR, low-inductance ceramic chip-type output capacitors

(X5R, X7R, or similar). If using an electrolytic capacitor on the output, place a 0.1-μF ceramic capacitor in parallel

to reduce overall ESR on the output.

In applications with slow-rising input voltage signals, the reference exhibits overshoot or other transient

anomalies that appear on the output. These phenomena also appear during shutdown as the internal circuitry

loses power.

To avoid such conditions, ensure that the input voltage wave-form has both a rising and falling slew rate close to

6 V/ms.

9.2.2.3 Shutdown/Enable Feature

The REF2125 references can be switched to a low power shut-down mode when a voltage of 0.5 V or lower is

input to the ENABLE pin. Likewise, the reference becomes operational for ENABLE voltages of 1.6 V or higher.

During shutdown, the supply current drops to less than 2 μA, useful in applications that are sensitive to power

consumption.

If using the shutdown feature, ensure that the ENABLE pin voltage does not fall between 0.5 V and 1.6 V

because this causes a large increase in the supply current of the device and may keep the reference from

starting up correctly. If not using the shutdown feature, however, the ENABLE pin can simply be tied to the IN

pin, and the reference remains operational continuously.

9.2.3 Application Curves

Figure 29. Quiescent Current vs Temperature

Figure 30. Quiescent Current Shutdown Mode

10 Power-Supply Recommendations

The REF2125 family of references feature an extremely low-dropout voltage. These references can be operated

with a supply of only 50 mV above the output voltage. TI recommends a supply bypass capacitor ranging

between 0.1 µF to 10 µF.