TC500IOG 데이터 시트보기 (PDF) - Microchip Technology

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TC500IOG

Precision Analog Front Ends with Dual Slope ADC

Microchip Technology 

TC500/A/510/514

TTIME

Converter Status

Auto-zero

Integrator 0

Voltage VINT

Comparator

Output

Undefined

Integrate

Full-scale Input

Reference

De-integrate

Overshoot Integrator

Output

Zero

Comparator Delay

0 For Negative Input

1 For Positive Input

A

AB Inputs

B

Controller

Operation

A=0

B=1

Begin Conversion with

Auto-Zero Phase

A=1

B=0

Time Input

Integration

Phase

Sample Input Polarity

A=1

B=1

Capture

De-integration

Time

A=0

B=0

Integrator Ready for Next

Output

Conversion

Zero Phase (Auto-Zero is

Complete Idle State)

Typically = TINT

TINT

(Positive Input Shown)

Notes: The length of this phase is chosen almost arbitrarily

but needs to be long enough to null out worst case errors

(see text).

Comparator Delay +

Processor Latency

Minimizing

Overshoot

will Minimize

I.O.Z. Time

FIGURE 5-1:

Typical Dual Slope A/D Converter System Timing.

DS21428E-page 12

© 2008 Microchip Technology Inc.

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