TC7107ACKW datasheet(15/34 Pages) MICROCHIP

15 / 34 page

DS21455D-page 15

TC7106/A/TC7107/A

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

pressure transducer output is 400 mV for 2000 lb/in2.

Rather than dividing the input voltage by two, the

reference voltage should be set to 200 mV. This

permits the transducer 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

instrumentation. A compensating offset voltage can be

applied between analog common and VIN-. The

transducer 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

stable

whenever

the

supply

potential

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

6.8 k

20 k

REF +

REF -

REF +

REF

(a)

(b)

V+

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