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Analog Devices Inc. AD8496CRMZ
- Part No.:
- AD8496CRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8496CRMZ.pdf
- Description:
- IC THRMOCPLE AMP 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
AD8496CRMZ from Analog Devices is a precision J-type thermocouple amplifier with integrated cold junction compensation, delivering 5 mV/°C output, ±2°C accuracy over +55°C to +565°C measurement range, and optimized ambient operation from 25°C to 100°C - used in oven, catalytic converter, and industrial temperature monitoring systems.
For engineers reviewing the AD8496CRMZ datasheet, AD8496CRMZ pinout, AD8496CRMZ application, or AD8496CRMZ equivalent, this page provides verified technical context, real-world design meaning of specifications, validated alternative options, and supply support for thermal sensing designs requiring high-accuracy cold-junction-compensated signal conditioning.
Technical Context
The AD8496CRMZ integrates a fixed-gain (90.35) instrumentation amplifier and an on-die temperature sensor to perform real-time cold junction compensation for J-type thermocouples. Its PNP-input architecture delivers 25 nA typical input bias current and enables thermocouple break detection via −IN grounding through 1 MΩ.
It operates from single supplies (2.7 V–36 V) or dual supplies (±2.7 V–±18 V), supports output swing within 25 mV of rails, and features ESD-hardened inputs rated to ±25 V beyond supply rails - enabling robust deployment in electrically noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transfer Function | 5 mV/°C - directly converts thermocouple voltage to Celsius-scaled analog output without external scaling. |
| Initial Accuracy | ±1.5°C at TA = TRJ = 60°C, TMJ = 175°C - laser wafer trimmed for J-type matching; enables one-point calibration in production. |
| Ambient Temp Rejection | 0.025°C/°C - limits error contribution from reference junction drift across 25°C–100°C ambient range. |
| Quiescent Current | 180 μA - enables low-power operation in battery-backed or energy-constrained thermal monitors. |
| Input Voltage Range | −VS − 0.2 V to +VS − 1.6 V - accommodates thermocouple common-mode shifts while maintaining rail-to-rail input headroom. |
| Output Short-Circuit Current | 7 mA - supports direct driving of 10 kΩ loads or RC filtering without buffer amplifiers. |
| −3 dB Bandwidth | 31 kHz - sufficient for fast thermal transients in exhaust gas or heating element control loops. |
| Settling Time (0.1%) | 32 μs - ensures rapid response to step changes in temperature, critical for closed-loop setpoint controllers. |
Pinout & Package
AD8496CRMZ is housed in an RoHS-compliant 8-lead MSOP (RM-8) package with θJA = 135°C/W, suitable for compact PCB layouts and thermally coupled mounting near thermocouple reference junctions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative Input | Inverting input for differential thermocouple connection; bias current flows out - enables open-circuit detection when grounded via 1 MΩ. |
| 2 (REF) | Reference Input | Low-impedance offset adjustment node; 1 V applied yields +200°C output offset - allows 0°C measurement on single supply. |
| 3 (−VS) | Negative Supply | Supports dual-supply operation down to −2.7 V; required for sub-zero thermocouple measurements without REF offset. |
| 4 (NC) | No Connect | Unbonded pad - must remain unconnected and unpopulated on PCB to avoid parasitic coupling. |
| 5 (SENSE) | Sense Terminal | Connects to OUT in thermometer mode; ties to setpoint voltage in comparator mode - enables flexible configuration without external components. |
| 6 (OUT) | Analog Output | High-drive (±5 mA) buffered output delivering 5 mV/°C signal - interfaces directly with 12-bit ADCs sampling at ≤10 kSPS. |
| 7 (+VS) | Positive Supply | Accepts 2.7 V–36 V single supply - powers device in wide-input industrial systems without LDO pre-regulation. |
| 8 (+IN) | Positive Input | Non-inverting input for differential thermocouple connection; matched bias current with −IN ensures <0.5°C CM error. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Cold Junction Compensation | On-chip temperature sensor calibrated for 25°C–100°C ambient - eliminates need for external RTD or thermistor networks. |
| J-Type Thermocouple Optimization | Laser-trimmed gain of 90.35 - maintains 5 mV/°C linearity across +55°C to +565°C measurement range per Table 7. |
| Thermocouple Break Detection | PNP input stage with 25 nA bias current - causes output rail-high when −IN floats, detectable by microcontroller ADC threshold. |
| Rugged Input Protection | Withstands ±25 V overvoltage relative to opposite supply rail - protects against ESD (4.5 kV HBM) and wiring faults in field-deployed equipment. |
| Differential Noise Rejection | 1°C/V common-mode rejection at DC - suppresses 60 Hz pickup and ground-loop interference on long thermocouple leads. |
| Flexible Power Architecture | Operates from 2.7 V single supply or ±2.7 V dual supply - supports both low-voltage portable sensors and high-voltage industrial PLC I/O modules. |
Applications
| Oven Temperature Control | Catalytic Converter Monitoring |
|---|---|
|
Use Scenario: Real-time monitoring of baking chamber temperature in commercial convection ovens using J-type thermocouple embedded in heating element housing. IC Role / Device Role / Timing Role: Precision thermocouple signal conditioner providing cold-junction-compensated 5 mV/°C output to microcontroller ADC for PID loop feedback. Use Value: ±2°C accuracy over 25°C–100°C ambient ensures consistent bake profiles despite enclosure surface temperature fluctuations. |
Use Scenario: Exhaust gas temperature measurement upstream of catalytic converter in automotive powertrain systems. IC Role / Device Role / Timing Role: High-reliability thermocouple amplifier with ESD-hardened inputs interfacing to engine control unit (ECU) analog front end. Use Value: 31 kHz bandwidth and 32 μs settling enable fast detection of catalyst light-off events during cold-start emission cycles. |
| Industrial Stovetop Sensing | Autoclave Chamber Monitoring |
|
Use Scenario: Surface temperature sensing on induction cooktops where J-type thermocouples are mounted beneath ceramic glass panels. IC Role / Device Role / Timing Role: Standalone Celsius thermometer with REF-pin offset capability - outputs linear voltage proportional to plate temperature. Use Value: Single-supply operation (2.7 V–36 V) and 180 μA quiescent current allow integration into space-constrained, low-power thermal safety circuits. |
Use Scenario: Sterilization cycle temperature verification inside medical-grade autoclaves operating up to 134°C. IC Role / Device Role / Timing Role: Cold-junction-compensated signal conditioner converting thermocouple output to 5 mV/°C for data logger input. Use Value: 0.025°C/°C ambient rejection minimizes drift caused by cabinet exterior temperature variations during multi-hour sterilization cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermocouple signal conditioning applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8494ARMZ | J-type optimized for 0°C–50°C ambient; initial accuracy ±1°C; gain = 96.7 | Better suited for lab-grade instruments or HVAC sensors where ambient stays near 25°C | Select AD8494ARMZ when reference junction remains stable near room temperature and tighter initial accuracy is prioritized over extended ambient range. |
| MAX31855KASA+ | Thermocouple-to-digital converter with SPI interface; K-type only; includes linearization in firmware | Replaces analog signal chain with digital output - requires microcontroller SPI host and software calibration | Choose MAX31855KASA+ when system already uses digital interfaces and firmware-based linearization is acceptable; not drop-in compatible with AD8496CRMZ analog output. |
Compared with AD8494ARMZ, AD8496CRMZ trades ±0.5°C initial accuracy for ±25°C wider ambient operating range (25°C–100°C vs. 0°C–50°C), making it more suitable for high-temperature enclosures. Compared with MAX31855KASA+, AD8496CRMZ offers direct analog output and J-type support but requires external ADC and linearization.
Availability
AD8496CRMZ is available at Aetrix Electronics and suitable for oven temperature control, catalytic converter monitoring, and industrial stovetop sensing requiring stable component supply, long-term lifecycle continuity, and traceable sourcing for thermal management subsystems.
Supply support for AD8496CRMZ 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 design centers worldwide and a legacy of precision signal conditioning innovation.
The AD849x family was designed specifically for thermocouple-based temperature measurement systems requiring integrated cold junction compensation, minimal external components, and factory-trimmed accuracy - targeting industrial, automotive, and appliance applications.
FAQ
What thermocouple type is AD8496CRMZ calibrated for?
AD8496CRMZ is laser wafer trimmed for J-type (iron-constantan) thermocouples. It delivers 5 mV/°C output across its specified measurement range (+55°C to +565°C) and is optimized for ambient temperatures from 25°C to 100°C. Using it with K-type or other thermocouple types introduces significant gain and nonlinearity errors not corrected by the internal compensation.
Can AD8496CRMZ measure below 0°C?
Yes, AD8496CRMZ can measure below 0°C when configured with a negative supply (e.g., ±5 V) or by applying a positive offset voltage to the REF pin on a single supply. With REF = 1.25 V and VS = 5 V, the output corresponds to (VOUT − 1.25 V)/(5 mV/°C), enabling 0°C measurement at 1.25 V output - extending usable range downward without dual supplies.
How does AD8496CRMZ implement cold junction compensation?
AD8496CRMZ integrates a precision on-die temperature sensor adjacent to the input stage to measure the IC's die temperature - which serves as the reference junction temperature when the thermocouple wires are soldered near the package. This sensor drives correction circuitry that adjusts the amplifier's gain and offset in real time to cancel cold junction EMF, eliminating external compensation components.
What is the purpose of the SENSE pin on AD8496CRMZ?
The SENSE pin on AD8496CRMZ enables dual-mode operation: when tied to OUT, it functions as a standalone Celsius thermometer; when connected to an external voltage (e.g., from DAC or potentiometer), it acts as a setpoint comparator - driving OUT high/low based on whether measured temperature exceeds the setpoint, enabling simple thermostat functionality without microcontroller intervention.
Does AD8496CRMZ support thermocouple break detection?
Yes, AD8496CRMZ supports thermocouple break detection via its PNP-input architecture. When the thermocouple opens, input bias current (25 nA typical) pulls −IN high through the 1 MΩ grounding resistor, causing the output to rail near +VS - a condition detectable by monitoring OUT with a comparator or ADC threshold. This provides fail-safe indication without additional circuitry.
AD8496CRMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Thermocouple Amplifier
- Input Type:
- Differential
- Output Type:
- Analog
- Current - Supply:
- 180 µA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8496CRMZ FAQ
1.How can I place an order for AD8496CRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8496CRMZ 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 AD8496CRMZ reliable?
The price and inventory of AD8496CRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8496CRMZ is usually 5 days.
3.What payment methods are accepted for AD8496CRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8496CRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8496CRMZ?
AD8496CRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8496CRMZ 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 AD8496CRMZ?
For technical support, including AD8496CRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8496CRMZ requirements.
6.How does Aetrix verify that AD8496CRMZ is sourced from the original manufacturer or authorized distributors?
All AD8496CRMZ 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 AD8496CRMZ meets industry standards.
7.What is the process for return or replacement of AD8496CRMZ?
All AD8496CRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8496CRMZ, 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 AD8496CRMZ part is unused and in its original packaging.
Return procedure for AD8496CRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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