TC7106A datasheet(14/32 Pages) MICROCHIP

14 / 32 page

TC7106/A/TC7107/A

DS21455C-page 14

In some applications, a scale factor other than unity

may exist between a transducer output voltage and the

required digital reading. Assume, for example, a pres-

sure transducer output is 400mV for 2000 lb/in2. Rather

than dividing the input voltage by two, the reference

voltage should be set to 200mV. This permits the trans-

ducer input to be used directly.

The differential reference can also be used when a

digital zero reading is required when VIN is not equal to

zero. This is common in temperature measuring instru-

mentation. A compensating offset voltage can be

applied between analog common and VIN-. The trans-

ducer output is connected between VIN+ and analog

common.

The internal voltage reference potential available at

analog common will normally be used to supply the

converter’s reference. This potential is stable when-

ever the supply potential is greater than approximately

7V. In applications where an externally generated

reference voltage is desired, refer to Figure 7-1.

FIGURE 7-1:

External Reference

TC7106A

TC7107A

6.8V

Zener

V+

1.2V

Ref

Common

TC7106A

TC7107A

6.8k

20k

VREF+

VREF-

VREF+

VREF-

(a)

(b)

V+

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