AD595:  Monolithic Thermocouple Amplifier with Cold Junction Compensation Pretrimmed for Type K Thermocouples

The AD594/AD595 is a complete instrumentation amplifier and thermocouple cold junction compensator on a monolithic chip. It combines an ice point reference with a precalibrated amplifier to produce ...More

AD595:  Monolithic Thermocouple Amplifier with Cold Junction Compensation Pretrimmed for Type K Thermocouples

Product Description

The AD594/AD595 is a complete instrumentation amplifier and thermocouple cold junction compensator on a monolithic chip. It combines an ice point reference with a precalibrated amplifier to produce a high level (10 mV/°C) output directly from a thermocouple signal. Pin-strapping options allow it to be used as a linear amplifier-compensator or as a switched output setpoint controller using either fixed or remote setpoint control. It can be used to amplify its compensation voltage directly, thereby converting it to a stand-alone Celsius transducer with a low impedance voltage output.

The AD594/AD595 includes a thermocouple failure alarm that indicates if one or both thermocouple leads become open. The alarm output has a flexible format which includes TTL drive capability.

The AD594/AD595 can be powered from a single ended supply (including +5 V) and by including a negative supply, temperatures below 0°C can be measured. To minimize self-heating, an unloaded AD594/AD595 will typically operate with a total supply current 160 µA, but is also capable of delivering in excess of ±5 mA to a load.

The AD594 is precalibrated by laser wafer trimming to match the characteristic of type J (iron-constantan) thermocouples and the AD595 is laser trimmed for type K (chromel-alumel) inputs. The temperature transducer voltages and gain control resistors are available at the package pins so that the circuit can be recalibrated for the thermocouple types by the addition of two or three resistors. These terminals also allow more precise calibration for both thermocouple and thermometer applications.

The AD594/AD595 is available in two performance grades. The C and the A versions have calibration accuracies of ±1°C and ±3°C, respectively. Both are designed to be used from 0°C to +50°C, and are available in 14-pin, hermetically sealed, side-brazed ceramic DIPs as well as low cost cerdip packages.

Features

  • Pretrimmed for Type J (AD594) or Type K (AD595) Thermocouples
  • Can Be Used with Type T Thermocouple Inputs
  • Low Impedance Voltage Output: 10 mV/°C
  • Built-In Ice Point Compensation
  • Wide Power Supply Range: +5 V to ±15 V
  • Low Power: <1 mW typical
  • Thermocouple Failure Alarm
  • Laser Wafer Trimmed to 1°C Calibration Accuracy
  • Setpoint Mode Operation
  • Self-Contained Celsius Thermometer Operation
  • High Impedance Differential Input
  • Side-Brazed DIP or Low Cost Cerdip

Diagrams

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  • Symbols and Footprints
AD595 Diagram
Typical Application Circuit for AD595

Specifications

Output Type Analog
Sensor Output +10 mV/°C
Temp Res(°C/LSB) n/a
Supply Voltage Range +4.5V to +5.5V
Temp Range(s) -55 to +125

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Part# Temp Res(°C/LSB) 25°C Temp Error (Deg C) Resolution (Bits) # Chan DAC Outputs Interface Temp Range(s) Supply Voltage Range Product Description Price* (1000-4999) Sensor Output Supply Current
TMP03 0.3 ±3 16 0 --- PWM -40 to +100 +4.5V to +7V Serial PWM-Output Temperature Sensor w/ Open-Collector Output $3.27 PWM 1.3mA
TMP04 0.3 ±3 16 0 --- PWM -40 to +100 +4.5V to +7V Serial PWM-Output Temperature Sensor w/ CMOS/TTL Output $3.27 PWM 1.3mA
AD7814 0.25 n/a 10 0 --- Serial, SPI -55 to +125 +2.7V to +5.5V 10-Bit Digital Temperature Sensor in 6-Lead SOT-23 $1.00 DSP Serial, MICROWIRE (TM), QSPI (TM), SPI (TM) 400µA
AD7414 0.25 n/a 10 0 --- I2C, Serial -40 to +125 +2.7V to +5.5V SMBus/I2C, 10-Bit Digital Temperature Sensor in 6-Pin SOT w/ SMBus Alert and Over-Temperature Pin $1.04 I²C ®, SMBus 900µA
AD7415 0.25 ±2 10 0 --- I2C, Serial -40 to +125 +2.7V to +5.5V SMBus/I2C, 10-Bit Digital Temperature Sensor in 5-Pin SOT $1.04 I²C ®, SMBus 900µA
AD7416 0.25 n/a 10 0 --- I2C, Serial -40 to +125 +2.7V to +5.5V 10-Bit Temperature-to-Digital Converter, -40°C to +125°C, ±2°C Accuracy $1.00 I²C ® 1mA
AD7314 0.25 ±1 10 0 --- Serial, SPI -35 to +85 +2.65V to +5.5V Low Voltage, 10-Bit Digital Temperature Sensor in 8-Lead µSOP $0.66 DSP Serial, MICROWIRE (TM), QSPI (TM), SPI (TM) 300µA
AD7818 0.25 ±1 10 1 --- Serial, SPI -40 to +85 +2.7V to +5.5V 9 µs, 10-Bit ADC w/ On-Chip Temperature Sensor & Over-Temperature Output $2.34 MICROWIRE (TM), QSPI (TM), SPI (TM) 2mA
AD7418 0.25 ±1 10 2 --- I2C, Serial -40 to +125 +2.7V to +5.5V 10-Bit ADC, Programmable Hi-Low Temp Limits w/ Over-Temp Alert, , Auto Pwr Dwn @ EOC $2.34 I²C ® 600µA
ADT7316 0.25 ±0.5 10 3 12-Bit x 4 I2C, I2C/SPI, Serial, SM Bus, SPI -40 to +120 +2.7V to +5.5V SPI/I2C® Compatible,10-Bit Digital Temperature Sensor With Quad Voltage-Output 12-Bit DAC $3.72 I²C ®, QSPI (TM), SMBus, SPI (TM) 3mA
ADT7317 0.25 ±0.5 10 3 10-Bit x 4 I2C, I2C/SPI, SM Bus, SPI -40 to +120 +2.7V to +5.5V SPI/I2C® Compatible,10-Bit Digital Temperature Sensor w/ Quad 10-Bit Voltage Output DAC $3.65 DSP Serial, I²C ®, MICROWIRE (TM), QSPI (TM), SMBus, SPI (TM) 3mA
ADT7318 0.25 +0.5 10 3 8-Bit x 4 I2C, I2C/SPI, Serial, SM Bus, SPI -40 to +120 +2.7V to +5.5V SPI/I2C® Compatible,10-Bit Digital Temperature Sensor & Quad Voltage Output 8-Bit DAC $3.56 DSP Serial, I²C ®, MICROWIRE (TM), QSPI (TM), SMBus, SPI (TM) 3mA
AD7817 0.25 ±1 10 4 --- Serial, SPI -40 to +85 +2.7V to +5.5V 4-Channel, 9 µs, 10-Bit ADC with On-Chip Temperature Sensor & Over-Temperature Flag $3.29 MICROWIRE (TM), QSPI (TM), SPI (TM) 2mA
AD7417 0.25 ±1 10 5 --- I2C, Serial -40 to +125 +2.7V to +5.5V 4-Channel, 10-Bit ADC w/ on-Chip Temperature Sensor, Programmable Setpoints, and Overtemp Flag Out $2.99 I²C ® 600µA
ADT7516 0.25 n/a 10 7 12-Bit x 4 I2C/SPI, Serial, SPI -40 to +120 +2.7V to +5.5V SPI/I2C Compatible Temperature Sensor w/10-Bit-4-Ch ADC & Quad 12-Bit Voltage DAC Control Outputs $3.72 I²C ®, SPI (TM) 3mA
ADT7411 0.25 +0.5 10 10 --- I2C, I2C/SPI, Serial, SPI -40 to +120 +2.7V to +5.5V SPI®-/I2C®-Compatible, 10-Bit ADC w/ Local & Remote Temp Msmt, 8 GP Analog Inputs, and VDD monitor $2.22 DSP Serial, I²C ®, MICROWIRE (TM), QSPI (TM), SPI (TM) 3mA
ADT7408 0.0625 ±1 12 0 --- I2C, SM Bus -20 to +125 +3V to +3.6V ± 2 Degree C Accurate, 12-Bit Digital Temperature Sensor $0.87 I²C ®, SMBus 550µA
ADT75 0.0625 n/a 12 0 --- I2C, Serial, SM Bus -55 to +125 +3V to +5.5V ±1 Deg C Accuracy, 12-Bit Digital Temperature Sensor $0.66 I²C ®, SMBus 525µA
ADT7301 0.03125 n/a 13 0 --- Serial, SPI -40 to +150 +2.7V to +5.5V 13-Bit, ±1ºC Accurate, MicroPower Digital Temperature Sensor in 6-Lead SOT-23 and 8-Lead MSOP $1.21 DSP Serial, MICROWIRE (TM), QSPI (TM), SPI (TM) 2.2µA
ADT7302 0.03125 n/a 13 0 --- Serial, SPI -40 to +125 +2.7V to +5.25V ±2°C Accurate, MicroPower Digital Temperature Sensor in 6-Lead SOT-23 $0.78 DSP Serial, MICROWIRE (TM), QSPI (TM), SPI (TM) 2.2mA
TMP06 0.025 ±0.5 12 0 --- PWM -40 to +150 +2.7V to +5.5V 0.5°C Accurate PWM Temperature Sensor in 5-Lead SC-70 or SOT-23 w/ Open Drain Output $0.66 PWM 650µA
TMP05 0.025 ±0.5 12 0 --- PWM -40 to +150 +2.7V to +5.5V 0.5°C Accurate PWM Temperature Sensor in 5-Lead SC-70 or SOT-23 w/ CMOS/TTL Output $0.70 PWM 650µA
ADT7310 0.0078 ±0.5 16 0 n/a Serial, SPI -55 to +150 +2.7V to +5.5V ±0.5 Deg C Accurate, 16-Bit Digital SPI Temperature Sensor $1.95 SPI (TM) 230µA
ADT7410 0.0078 ±0.5 16 0 --- I2C -55 to +150 +2.7V to +5.5V ±0.5°C Accurate, 16-Bit Digital I2C Temperature Sensor $1.95 I²C ® 230µA
Sorted by Temperature Resolution (Ascending) and # of External ADC Input Channels (Ascending)

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This is the acceptable operating range of the device. The various ranges specified are as follows:
  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
  • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
  • Automotive: -40 to +125 degrees Celsius
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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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