TC826 データシートの表示（PDF） - Microchip Technology

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TC826

Analog-to-Digital Converter with Bar Graph Display Output

Microchip Technology 

For a constant VIN:

EQUATION 3-2:

VIN = VR

TRI

TSI

The dual slope converter accuracy is unrelated to the

integrating resistor and capacitor values, as long as

they are stable during a measurement cycle. An inher-

ent benefit is noise immunity. Noise spikes are inte-

grated or averaged to zero during the integration

periods. Integrating ADCs are immune to the large con-

version errors that plague successive approximation

converters in high noise environments. Interfering sig-

nals with frequency components at multiples of the

averaging period will be attenuated (Figure 3-2).

The TC826 converter improves the conventional dual

slope conversion technique by incorporating an auto-

zero phase. This phase eliminates zero scale offset

errors and drift. A potentiometer is not required to

obtain a zero output for zero input.

TC826

FIGURE 3-2:

NORMAL MODE

REJECTION OF DUAL

SLOPE CONVERTER

30

T = Measurement

Period

20

10

0

0.1/T

1/T

Input Frequency

10/T

© 2002 Microchip Technology Inc.

DS21477B-page 7

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