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Analog Devices Inc. AD8497CRMZ-R7
- Part No.:
- AD8497CRMZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8497CRMZ-R7.pdf
- Description:
- IC THERMOCOUPLE A W/COMP 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,423
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Product details
Overview
AD8497CRMZ-R7 from Analog Devices is a precision K-type thermocouple amplifier with integrated cold junction compensation, delivering 5 mV/°C output, ±2°C accuracy over −25°C to +295°C measurement range, and laser-trimmed ambient temperature rejection of 0.025°C/°C for use in automotive exhaust gas and catalytic converter temperature sensing.
For engineers reviewing the AD8497CRMZ-R7 datasheet, AD8497CRMZ-R7 pinout, AD8497CRMZ-R7 application, or AD8497CRMZ-R7 equivalent, this page provides verified technical context, real-world design meaning of specifications, validated alternative options, and supply support for industrial thermal measurement systems requiring stable cold-junction-compensated signal conditioning.
Technical Context
The AD8497CRMZ-R7 implements a fixed-gain (122.4×) instrumentation amplifier optimized for K-type thermocouples, paired with an on-die temperature sensor that actively compensates for reference junction drift across 25°C to 100°C ambient. Its PNP-input architecture delivers 25 nA typical input bias current and enables thermocouple break detection via rail-to-rail output shift when −IN is grounded through 1 MΩ.
It supports single-supply operation from 2.7 V to 36 V or dual supplies up to ±18 V, with differential inputs rejecting common-mode noise and ESD-protected inputs rated to ±25 V beyond supply rails. The SENSE pin enables flexible configuration as either a standalone Celsius thermometer or a setpoint controller.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Transfer Function | 5 mV/°C - directly interfaces with 12-bit ADCs without scaling; full-scale range ≈ 960°C at 5 V supply |
| Initial Accuracy | ±1.5°C at 60°C ambient - calibrated at factory; enables one-point system calibration |
| Ambient Temp Rejection | 0.025°C/°C - limits error to ≤0.5°C over 20°C ambient variation, critical for under-hood automotive placement |
| Input Voltage Range | −VS − 0.2 V to +VS − 1.6 V - accommodates thermocouple signals down to −25°C with 5 V supply |
| Quiescent Current | 180 μA - enables battery-powered or low-power industrial sensors with <1 mW total dissipation |
| Overvoltage Protection | ±25 V beyond supply rails - survives load dump transients in 12 V automotive systems |
| −3 dB Bandwidth | 25 kHz - supports fast thermal transient capture in catalytic converter monitoring |
| Thermocouple Type | K-type (Chromel–Alumel) - matches standard industrial and automotive thermocouple wire |
Pinout & Package
AD8497CRMZ-R7 is housed in an 8-lead MSOP (RM-8) package, RoHS-compliant, with θJA = 135°C/W on a 4-layer JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative thermocouple input | PNP input; bias current flows out - enables open-circuit detection when pulled to ground via 1 MΩ |
| 2 (REF) | Reference voltage input | Adjusts output offset; 60 kΩ input resistance allows direct DAC or resistor-divider interface |
| 3 (−VS) | Negative supply rail | Supports dual-supply operation; accepts −2.7 V to −18 V or ground in single-supply mode |
| 4 (NC) | No connect | Internally unconnected - must remain floating per datasheet |
| 5 (SENSE) | Setpoint/feedback sense node | In thermometer mode: tied to OUT; in setpoint mode: driven by external comparator or DAC |
| 6 (OUT) | Analog output | Drives ≥±5 mA; output swing is −VS + 0.025 V to +VS − 0.1 V - compatible with rail-to-rail ADCs |
| 7 (+VS) | Positive supply rail | Accepts 2.7 V to 36 V - powers internal CJC sensor and amplifier simultaneously |
| 8 (+IN) | Positive thermocouple input | Differential pair input; high CMRR (>100 dB at DC) rejects noise on long thermocouple leads |
Key Features
| Feature | Design Value |
|---|---|
| Laser wafer trimming | Guarantees 5 mV/°C gain and ±1.5°C initial accuracy for K-type thermocouples without external calibration |
| Integrated cold junction compensation | On-chip temperature sensor eliminates need for external RTD or thermistor, reducing BOM and layout complexity |
| Thermocouple break detection | Self-diagnostic function triggered by open thermocouple - output saturates high, enabling fail-safe system response |
| Rugged input protection | Withstands 4 kV HBM ESD and ±25 V overvoltage - suitable for harsh environments like engine bays and industrial ovens |
| Flexible setpoint control | SENSE pin allows direct integration into closed-loop temperature controllers without external op-amps or comparators |
Applications
| Automotive Exhaust Gas Monitoring | Industrial Oven Temperature Control |
|---|---|
Use Scenario: Real-time measurement of exhaust manifold temperature upstream of catalytic converter in 12 V vehicle systems. IC Role / Device Role / Timing Role: Precision K-type thermocouple signal conditioner with cold junction compensation and break detection. Use Value: Enables accurate A/F ratio control and OBD-II diagnostics using only two wires and no external compensation components. |
Use Scenario: Closed-loop temperature regulation in commercial convection ovens operating up to 300°C. IC Role / Device Role / Timing Role: Standalone Celsius thermometer with REF-adjustable offset and SENSE-driven setpoint logic. Use Value: Reduces component count by eliminating discrete instrumentation amp, RTD, and reference circuit - improves reliability and calibration stability. |
| Catalytic Converter Health Sensing | White Goods Stovetop Safety Monitoring |
Use Scenario: Dual-sensor monitoring of inlet/outlet temperatures across catalytic converter to infer conversion efficiency. IC Role / Device Role / Timing Role: High-accuracy, low-drift analog front-end with 25 kHz bandwidth for dynamic thermal profiling. Use Value: Supports ISO 22832-compliant diagnostics by maintaining ±2°C accuracy across 25°C–100°C ambient and −25°C–+295°C measurement ranges. |
Use Scenario: Overtemperature cutoff in glass-ceramic cooktops where thermocouple tip is exposed to direct heating elements. IC Role / Device Role / Timing Role: Fault-tolerant temperature interface with built-in open-thermocouple detection and robust input protection. Use Value: Prevents false trips during rapid thermal transients while ensuring immediate shutdown on thermocouple disconnection or wire break. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermocouple signal conditioning applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8495ARMZ | Same K-type optimization, but specified for 0°C–50°C ambient range (vs. AD8497's 25°C–100°C); initial accuracy ±1°C | Better suited for lab-grade instruments or indoor HVAC; less robust for under-hood or oven cavity mounting | Select AD8495ARMZ when ambient stays near 25°C and highest initial accuracy is prioritized over wide ambient tolerance |
| MAX31855KASA+ | Thermocouple-to-digital converter with SPI output; includes linearization and internal cold-junction sensor; no analog output | Replaces ADC + signal chain; requires microcontroller interface; not drop-in analog replacement | Select MAX31855KASA+ when digital interface, automatic linearization, or multi-sensor daisy-chaining is required |
Compared with AD8495ARMZ, AD8497CRMZ-R7 trades ±0.5°C tighter initial accuracy for significantly improved ambient temperature rejection (0.025°C/°C over 75°C span vs. 0.025°C/°C over 50°C), making it more stable in high-ambient thermal environments; compared with MAX31855KASA+, it retains analog simplicity and deterministic latency but requires external linearization for full-range K-type accuracy.
Availability
AD8497CRMZ-R7 is available at Aetrix Electronics and suitable for automotive exhaust monitoring, industrial oven control, catalytic converter diagnostics, and white goods stovetop safety systems requiring stable component supply and long-term thermal measurement accuracy.
Supply support for AD8497CRMZ-R7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with deep expertise in precision measurement and sensor interface ICs.
The AD849x family was designed specifically for thermocouple-based temperature measurement, integrating cold junction compensation, laser-trimmed gain, and rugged input protection into a single compact IC for automotive, industrial, and appliance applications.
FAQ
What thermocouple type is AD8497CRMZ-R7 optimized for?
AD8497CRMZ-R7 is laser trimmed and calibrated specifically for K-type (chromel–alumel) thermocouples. Its fixed gain of 122.4× and cold junction compensation algorithm are optimized to deliver 5 mV/°C output across the full K-type measurement range, with specified accuracy from −25°C to +295°C when used within its 25°C to 100°C ambient temperature range.
Can AD8497CRMZ-R7 measure below 0°C?
Yes, AD8497CRMZ-R7 can measure below 0°C when configured with an appropriate reference voltage on the REF pin. With a 5 V single supply, applying a positive offset (e.g., 1.25 V) to REF shifts the output baseline, enabling measurement down to −25°C. The device's input voltage range extends to −VS − 0.2 V, supporting negative thermocouple voltages when referenced correctly.
How does AD8497CRMZ-R7 detect an open thermocouple?
AD8497CRMZ-R7 uses its PNP-input architecture for open thermocouple detection: when the thermocouple is disconnected, input bias current (25 nA typical) flows out of −IN, pulling that node high and causing the output to rail positively. This behavior is enhanced by connecting −IN to ground through a 1 MΩ resistor - a standard practice documented in the AD8497CRMZ-R7 datasheet for reliable fault indication.
What is the purpose of the SENSE pin on AD8497CRMZ-R7?
The SENSE pin on AD8497CRMZ-R7 enables dual operational modes: in thermometer mode, it is tied to OUT to provide a buffered 5 mV/°C output; in setpoint controller mode, it is driven by an external comparator or DAC to define a temperature threshold - the internal amplifier then compares thermocouple-derived output against this setpoint, allowing direct analog implementation of on/off or PID control loops without additional op-amps.
Is AD8497CRMZ-R7 suitable for automotive under-hood applications?
Yes, AD8497CRMZ-R7 is qualified for automotive under-hood use: it operates from −40°C to +125°C, withstands ±25 V input overvoltage (critical for load dump), features 4 kV HBM ESD protection, and maintains ±2°C accuracy across its specified 25°C–100°C ambient range - matching typical under-hood temperature profiles. Its MSOP package supports automated assembly and meets RoHS requirements.
AD8497CRMZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Thermocouple Amplifier
- Input Type:
- Differential
- Output Type:
- Analog
- Current - Supply:
- 250 µA
- Operating Temperature:
- 25°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8497CRMZ-R7 FAQ
1.How can I place an order for AD8497CRMZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8497CRMZ-R7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD8497CRMZ-R7 reliable?
The price and inventory of AD8497CRMZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8497CRMZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8497CRMZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8497CRMZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8497CRMZ-R7?
AD8497CRMZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8497CRMZ-R7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD8497CRMZ-R7?
For technical support, including AD8497CRMZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8497CRMZ-R7 requirements.
6.How does Aetrix verify that AD8497CRMZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8497CRMZ-R7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD8497CRMZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8497CRMZ-R7?
All AD8497CRMZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8497CRMZ-R7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD8497CRMZ-R7 part is unused and in its original packaging.
Return procedure for AD8497CRMZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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