7.2.5 Level Shift to Achieve Full ADC Input Range

The REF1112 is also useful for level shifting, and as shown in Figure 7-5, can be used to achieve the full input

range of an analog-to-digital converter (ADC).

V

REF

V

IN

+V

−V

V

S

1.25V

0.1μF

ADC

V

OUT

Figure 7-5. REF1112 Provides a Level Shift to Achieve Full ADC Input Range

7.2.6 Stable Current Source

The REF1112 can be configured with an additional diode and NPN transistor to provide a temperature

compensated current reference as shown in Figure 7-6.

V

S

I

SET

0.1 μF

R

SET

10k

Ω

I

SET =

V

REF

R

SET

Figure 7-6. REF1112 as a Stable Current Source

7.3 Power Supply Recommendations

While a bypass capacitor is not required on the input voltage line, TI recommends reducing noise on the input

which can affect the output. A 0.1μF ceramic capacitor or larger is recommended.

7.4 Layout

7.4.1 Layout Guidelines

Place decoupling capacitors as close to the device as possible. Use appropriate widths for traces when shunting

high currents to avoid excessive voltage drops.

www.ti.com

REF1112

SBOS283E – SEPTEMBER 2003 – REVISED DECEMBER 2024

Copyright © 2024 Texas Instruments Incorporated

Submit Document Feedback

11

Product Folder Links: REF1112