AD8494/AD8495/AD8496/AD8497 all is the J that uses easily model with K thermocouple amplifier. The little tension changeover that these amplifier produce thermocouple node is modulus converter (ADC) or small controller read extraction signal easily. The gain that outputs end to amplifier from thermocouple is 5 MV/°C about.

 

AD849x is used piece on temperature sensor carries out cold knot compensation. Thermocouple can undertake be metricaled accurately inside limits of wide environment temperature.

 

The buy inside AD849x amplifier of appearance of a high accuracy. This amplifier has Gao Gongmo to control function, can restrain long lead thermocouple may of collect in all modular noise. If want additional protection, the tall impedance of this amplifier inputs end to allow to add extra filter wave step easily.

 

AD849x supports limits of voltage of broad power supply. In 5V sheet power source falls, AD849x can cover nearly 1000 degrees thermocouple temperature range. Below 3V power source, it is OK and direct with interface of ADC of voltage of low power source. It also can use the power source power supply that is as high as ±18V, supportive requirement is wide in all the industrial system of modular input limits.

 

Why to no matter use,plant power source course, AD849x can measure negative temperature easily. Can use fiducial the tension that cites a foot to go up adjusts 0°C output, this outputted limits to provide flexibility in order to get used to ADC to adjust AD849x.

 

Stable input design can treat all sorts of actual join conditions. AD849x can bear the input voltage of course of outclass power source. For example, when using power supply of ±5 V power source, although the voltage that inputs end achieves ±35 V to also assure to won’t damage this parts of an apparatus. The smallest reach the biggest input to slant character of buy electric current is helpful for breakdown of thermocouple open a way detecting.

 

AD849x uses the 8 MSOP that cite a base to enclose, accord with RoHS standard completely.

 

Functional-block diagram

 

 

Characteristic

● is compositive cold knot compensation

● 5-m V/°C is outputted, only power source works, power source voltage but low to 2.7V, offer course to be outputted to course

● tall impedance differs minute of input

● is fiducial bring a foot to offer maladjusted adjust a function

Limits of voltage of ● broad power supply: 2.7V comes ±18 V

Precision of ● tall gain: 0.1%

● low power comsumption: 180? Source current of A static state

● Gao Gongmo restrains: 0.1°C/V

 

Application

 

– – J or K thermocouple

– – oven temperature is measured

– – waste gas temperature detects