AD8495ARMZ-R7
Sensor and Detector Interfaces
Technical Specifications
| Type | Description |
|---|---|
| Ib - Input Bias Current | 25uA |
| The Chip Type | Thermocouple Amplifier |
| Features | Input fault detection;Overvoltage protection;Programmable reference voltage |
| Type | Description |
|---|---|
| Single Supply | 2.7V~3.6V |
| Operating Temp | -40°C ~ +125°C |
| Package / Case | MSOP-8 |
Product Introduction
The AD8494/AD8495/AD8496/AD8497 are precision instrumentation amplifiers with thermocouple cold junction compensators on an integrated circuit. They produce a high level (5 mV/°C) output directly from a thermocouple signal by combining an ice point reference with a precalibrated amplifier. They can be used as standalone thermometers or as switched output setpoint controllers using either a fixed or remote setpoint control.
The AD8494/AD8495/AD8496/AD8497 can be powered from a single-ended supply (less than 3 V) and can measure temperatures below 0°C by offsetting the reference input. To minimize selfheating, an unloaded AD849x typically operates with a total supply current of 180 μA, but it is also capable of delivering in excess of ±5 mA to a load.
The AD8494 and AD8496 are precalibrated by laser wafer trimming to match the characteristics of J type (iron-constantan) thermocouples; the AD8495 and AD8497 are laser trimmed to match the characteristics of K type (chromel-alumel) thermocouples.
The AD8494/AD8495/AD8496/AD8497 allow a wide variety of supply voltages. With a 5 V single supply, the 5 mV/°C output allows the devices to cover nearly 1000 degrees of a thermocouple’s temperature range.
The AD8494/AD8495/AD8496/AD8497 work with 3V supplies, allowing them to interface directly to lower supply ADCs. They can also work with supplies as large as 36 V in industrial systems that require a wide common-mode input range.
Features
- Low cost and easy to use
- Pretrimmed for J or K type thermocouples
- Internal cold junction compensation
- High impedance differential input
- Standalone 5 mV/°C thermometer
- Reference pin allows offset adjustment
- Thermocouple break detection
- Laser wafer trimmed to ±1°C initial accuracy and 0.025°C/°C ambient temperature rejection
- Low power: < 1 mW at VS = 5 V
- Wide power supply range Single supply: 2.7 V to 36 V Dual supply: ±2.7 V to ±18 V
- Small, 8-lead MSOP
Applications
- - J or K type thermocouple temperature measurement - Setpoint controller - Celsius thermometer - Universal cold junction compensator - White goods (oven, stove top) temperature measurements - Exhaust gas temperature sensing - Catalytic converter temperature sensing
Datasheet
Compliance & Export Codes
| Type | Details |
|---|---|
| RoHS | ROHS3 |
| ECCN | EAR99 |
| CNHTS | 8542339000 |
| USHTS | 8542330001 |
| TARIC | 8542339000 |
| Type | Details |
|---|---|
| CAHTS | 8542330000 |
| BRHTS | 85423390 |
| INHTS | 85423300 |
| MXHTS | 8542.33.99 |
Sourcing Information
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