ES5136 datasheet(9/22 Pages) CYRUSTEK

No. de pieza	ES5136

Descripción Electrónicos	3 1/2 DIGIT A/D CONVERTER W/LCD(Low power)

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Fabricante Electrónico	CYRUSTEK [Cyrustek corporation]

Página de inicio	http://www.cyrustek.com.tw

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ES5136

3 1/2 DIGIT A/D CONVERTER W/LCD(Low power)

9

DX、FUNCTION DESCRIPTION

A、Analog Section

The Analog Section of the ES5136 is a dual slope converter, which is

shown in Figure 1. The conversion takes place in four distinct phases.

1.Phase 1, Auto Zero (A/Z)

During auto zero processing, the internal A/Z switches are turned on.

The errors in the analog components(offset voltage of buffer,

integrator and comparator)will be automatically nulled out by shorting

the input internally to COMMON and closing a feed back loop such

that error information is stored on the auto-zero capacitor C

AZ At the

same time. the reference capacitor is charged to the reference voltage

V

REF.

2.Phase 2, Signal Integrate(INT)

During signal integrating, the A/Z switches are opened and the INT

switches are closed for 1,000 system clock pulses. The integrating

capacitor will ramp up at a rate that is proportional to input voltage

V

IN. At the end of this phase the polarity of the integrated signal is

determined.

3.Phase 3, Reference Deintegrate(DE)

At the beginning of this phase, the input low is internally connected to

COMMON and input high is switched from V

IN to. VREF According to

the polarity, the integrator will discharge back toward zero. The nuber

of system clock pulses counted between the beginning of this cycle

and the time when the integrator output passes through zero is a digital

measure of the magnitude of input voltage. Specifically the digital

reading displayed is 1000(V

IN/VREF).

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