ES5117 datasheet, PDF - EEWORLD Datasheet

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ES5117: Description3 1/2 dvm with led display and hold; File Size632KB，10 Pages; ManufacturerCyrustek; Websitehttp://www.cyrustek.com.tw

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ES5117 Overview

3 1/2 dvm with led display and hold

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ES5117

3 1/2 DVM

with

LED Display and Hold

Features

Description

•

Guaranteed zero reading with zero input The ES5117 is a monolithic CMOS 3 1/2

digit

LED display

A/D converter with

•

Low input leakage current (1pA typical)

Display Hold

function. It contains the

•

Internal reference with low temperature internal clock, voltage reference, seven-

segment decoder and LED display driver.

drift ( 60ppm/

℃

typically)

The improved internal zener reference

voltage circuit gives the analog common a

•

Low noise (15uVp-p typical)

small temperature coefficient of 60

ppm/

℃

•

Direct LED display driver

typically. The high accuracy characteristics

•

Differential input and voltage reference

•

Precise null detection with true polarity

at zero

•

Internal clock circuit

•

No additional active circuits required

•

Display Hold

of the ES5117 perform very low linearity

error and rollover error. The high input

impedance (>10

Ω)

and low input leakage

current (1pA typical) give the ES5117 a

good application in the field of high

impedance circuit measurement. The

differential input and reference are suitable

for measuring bridge transducer or ohms by

using ratio-metric method. The dual slope

conversion technique makes the ES5117 a

good normal and common mode rejection

ratio. With a suitable oscillator frequency,

the ES5117 has a high rejection of 50Hz,

60Hz and 400Hz line frequency noise. With

single power supply, a few passive

components and a LED display, ES5117 can

be built as high performance panel meter.

Application

Digital panel meters

03/07/21

ES5117

3 1/2 DVM

with

LED Display and Hold

Function Description

1. Analog Common

The COMMON pin is used to set the common-mode voltage for the system which the

input signals are floating. In most of the applications, IN LO, REF LO and COMMON

pins are usually connected. It can remove common-mode voltage concerns. In other

applications, INLO does not connect with COMMON. The ES5117 generates a

common mode voltage, which has the high CMRR (86dB typical). Nevertheless, it

should be care to prevent the output of the integrator form saturation.

The COMMON pin is also used as a voltage reference. It outputs a voltage, which

is around 2.9 volts below the positive supply. The COMMON voltage has a low output

impedance of 15Ω typically.

The analog COMMON is connected internally to a NMOS, which can sink 30mA.

This NMOS will hold the COMMON voltage at 2.9 volts when an external load

attempts to pull the COMMON voltage toward the positive supply. The source current

of COMMON is only 10uA, so it is easy to pull COMMON voltage to a more negative

voltage.

When the total supply voltage is large enough to cause the zener to regulate (>7V),

the COMMON voltage will have a low temperature coefficient less than 60ppm/℃

typically. The voltage can be used to generate the reference voltage.

2. Reference Voltage

For a 1000 counts reading, the input signal must be equal to the reference voltage. As a

result, it requires the input signal be twice the reference voltage for a 2000 counts full-

scale reading. Thus, for the 200.0mV and 2.000V full-scale, the reference voltage

should equal 100.0mV and 1.000V. In some applications the full-scale input voltage

may be different to 200mV or 2.000V. For example, in the 600mV full-scale

applications, the reference voltage should be set to 300mV.

The differential reference should be used during the measurement of resistor by

the ratio-metric method and when a digital reading of zero is desired for Vin≠0, a

compensating offset voltage can be applied between COMMON and IN LO, and the

voltage of being measured is connected between COMMON and IN HI.

03/07/21

ES5117 Related Products

	ES5117	ES5117Q
Description	3 1/2 dvm with led display and hold	3 1/2 dvm with led display and hold

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