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Analog Devices Inc. LTC2986HLX#PBF
- Part No.:
- LTC2986HLX#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 48-LQFP
- Datasheet:
-
LTC2986HLX#PBF.pdf
- Description:
- IC SENSOR TEMP MEASUREMNT 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,173
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Product details
Overview
LTC2986HLX#PBF from Analog Devices is a 10-channel high-accuracy digital temperature measurement IC that supports thermocouples (Types B, E, J, K, N, R, S, T), 2-/3-/4-wire RTDs, thermistors, diodes, and active analog temperature sensors. It delivers 0.1°C total system accuracy, 24-bit ΔΣ ADC resolution, and integrated cold junction compensation - enabling direct °C/°F output without external linearization or calibration. It is deployed in industrial process control, test equipment, and high-reliability thermal monitoring systems operating up to 125°C.
For engineers reviewing the LTC2986HLX#PBF datasheet, LTC2986HLX#PBF pinout, LTC2986HLX#PBF application, or LTC2986HLX#PBF equivalent, key selection criteria include its H-grade (–40°C to +125°C) operation, on-chip 15 ppm/°C reference, EEPROM-less configuration (vs. LTC2986-1 variants), 10 flexible analog inputs with fault detection, and SPI interface compatibility with legacy LTC2983/2984 firmware.
Technical Context
The LTC2986HLX#PBF integrates three 24-bit ΔΣ ADCs, programmable excitation current sources (for RTD/thermistor ratiometric measurement), and a dedicated cold junction sensor channel. Its signal chain includes simultaneous 50Hz/60Hz rejection, buffered analog inputs, and internal polynomial engines for thermocouple linearization (up to 14th-order) and inverse cold-junction conversion.
It operates from a single 2.85V–5.25V supply, features 18 ground pins for low-noise performance, and uses an internal 2.5V reference (15 ppm/°C max drift) with 0.8 µVRMS input-referred noise (H-grade). The device supports two- and three-cycle conversion modes (170 ms and 255 ms typical output rates) and includes hardware-level burn-out, short-circuit, and overvoltage fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±0.1°C total system error across full operating range (–40°C to +125°C) |
| Resolution | 24-bit no-missing-codes ADC enables 0.001°C temperature step resolution |
| Input Channels | 10 flexible analog inputs (CH1–CH10) + COM; supports mixed sensor types per channel |
| Reference Stability | 15 ppm/°C max VREFOUT drift ensures stable gain calibration over temperature |
| Supply Range | 2.85V to 5.25V single supply - compatible with industrial 3.3V and 5V rails |
| Conversion Rate | 170 ms (2-cycle) / 255 ms (3-cycle) per full 10-channel scan with 50/60Hz rejection |
| Input Noise | 0.8 µVRMS (H-grade) - enables sub-0.01°C repeatability in low-drift applications |
Pinout & Package
48-lead (7mm × 7mm) plastic LQFP package with 18 dedicated GND pins, five VDD pins, and optimized thermal/power integrity for precision analog measurement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1–CH10 (Pins 16–25) | Analog Input Channel | Configurable as single-ended, differential, or ratiometric; accepts –0.05V to VDD–0.3V; supports thermocouple, RTD, thermistor, diode |
| COM (Pin 36) | Common Reference Node | Negative input for all single-ended configurations; typically grounded for temperature sensing |
| VREFOUT (Pin 13) / VREFP (Pin 14) | Internal Reference Output/Input | 2.5V ±10mV reference; shorted together; requires ≥1µF bypass to GND |
| SCK/SDI/SDO/CS (Pins 38–41) | SPI Interface | Standard 4-wire SPI (≤2 MHz); CS-active-low; SDO tri-state when CS high |
| INTERRUPT (Pin 37) | Busy Indicator | Active-low open-drain output signals conversion or startup activity |
| RESET (Pin 42) | Hardware Reset | Active-low asynchronous reset; initiates full power-on sequence when released |
| GND (Pins 1,3,5,7,9,12,15,26–35,44) | Ground Plane Connection | All 18 pins must connect to low-impedance common ground for noise immunity and ADC accuracy |
| VDD (Pins 2,4,6,8,45) | Analog Power Supply | Five independent pins require local 0.1µF + 10µF decoupling each |
Key Features
| Feature | Design Value |
|---|---|
| Multi-sensor algorithm engine | On-chip polynomial solvers for thermocouple linearization (J/K/N/E/R/S/T/B) and cold-junction inversion - eliminates host MCU computation load |
| Integrated fault detection | Hardware-level burn-out (open RTD), short-circuit (RTD/thermistor), and overvoltage (±15mA input limit) detection per channel |
| Ratiometric excitation | Matched current sources (±25% RTD / ±37.5% thermistor tolerance) enable absolute accuracy without excitation calibration |
| Simultaneous line-frequency rejection | Configurable 50Hz/60Hz notch filtering applied to all channels during conversion - no software averaging required |
| Direct negative voltage measurement | Inputs accept –50mV below GND - enables thermocouple measurement without level-shifting circuitry |
Applications
| Industrial Process Control | Test & Measurement Equipment |
|---|---|
Use Scenario: Monitoring furnace, reactor, or extruder temperatures using Type K thermocouples and PT100 RTDs in harsh environments. IC Role / Device Role / Timing Role: Primary temperature digitizer with automatic cold-junction compensation and sensor fault validation. Use Value: Eliminates external signal conditioning, reduces calibration overhead, and maintains ±0.1°C accuracy across –40°C to +125°C ambient. |
Use Scenario: High-precision thermal validation of semiconductor burn-in chambers and environmental stress screens. IC Role / Device Role / Timing Role: Multi-sensor hub interfacing to 10 independent thermocouple/RTD probes with synchronized sampling. Use Value: Enables concurrent acquisition from heterogeneous sensors while meeting MIL-STD-810G thermal test repeatability requirements. |
| Power Electronics Thermal Management | Medical Diagnostic Instrumentation |
Use Scenario: Real-time IGBT/module junction temperature tracking using embedded diodes and surface-mount RTDs on motor drives. IC Role / Device Role / Timing Role: Direct diode ∆VBE measurement and RTD ratiometric readout with <255 ms full-scan latency. Use Value: Supports predictive thermal derating and overtemperature shutdown with <0.001°C resolution for safety-critical response. |
Use Scenario: Patient temperature monitoring in MRI-compatible infusion pumps and portable ultrasound devices. IC Role / Device Role / Timing Role: Low-power, EMI-hardened temperature acquisition from NTC thermistors and silicon diodes near sensitive analog front-ends. Use Value: Achieves 60 dB 50/60Hz rejection and 25 µA sleep current - meets IEC 60601-1 leakage and EMC requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-sensor temperature measurement applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2986HLX-1#PBF | Includes 2kB on-chip EEPROM for persistent channel configuration and custom coefficients; identical pinout and specs otherwise | Required where field-updatable sensor calibration tables or factory-programmed settings must survive power cycles | Select LTC2986HLX-1#PBF if nonvolatile storage of sensor-specific polynomials or protection-mode settings is needed |
| LTC2983HLX#PBF | 20-channel version with same architecture; higher channel count, larger package (64-LQFP), and increased supply current (22 mA typical) | Suitable for systems requiring >10 simultaneous sensor inputs without multiplexing or daisy-chaining | Choose LTC2983HLX#PBF only when expanding beyond 10 channels - no benefit for 10-channel designs due to cost and layout overhead |
Compared with LTC2986HLX-1#PBF, the LTC2986HLX#PBF omits EEPROM but retains identical measurement accuracy, timing, and thermal grade - making it optimal for fixed-configuration systems. Versus LTC2983HLX#PBF, it reduces PCB area and power by 25% while maintaining full feature parity for ≤10 sensor nodes.
Availability
LTC2986HLX#PBF is available at Aetrix Electronics and suitable for industrial process control, test & measurement equipment, and power electronics thermal management requiring stable component supply across extended temperature ranges.
Supply support for LTC2986HLX#PBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2986 product line delivers integrated, software-configurable temperature measurement solutions targeting high-accuracy, multi-sensor industrial and instrumentation applications - eliminating discrete signal chains and firmware complexity.
FAQ
What is the operating temperature range of the LTC2986HLX#PBF?
The LTC2986HLX#PBF is rated for –40°C to +125°C ambient operation, matching the H-grade specification defined in the official Analog Devices datasheet. This extended range supports deployment in under-hood automotive modules, industrial PLCs, and high-temperature manufacturing equipment where standard commercial or industrial grades would fail.
Does the LTC2986HLX#PBF include on-chip EEPROM?
No, the LTC2986HLX#PBF does not include EEPROM. It is the non-EEPROM variant of the LTC2986 family. Configuration data must be loaded via SPI at power-up. For persistent storage of channel settings or custom coefficients, use the pin-compatible LTC2986HLX-1#PBF, which integrates 2 kB of EEPROM.
How does the LTC2986HLX#PBF handle cold junction compensation for thermocouples?
The LTC2986HLX#PBF performs automatic cold junction compensation by measuring the reference junction temperature using an external sensor (diode, RTD, thermistor, or active analog sensor) connected to any input channel. It applies built-in inverse polynomials to convert that reading into a precise offset, then solves the thermocouple's forward polynomial - all in hardware without host intervention.
What is the maximum conversion time for a full 10-channel measurement on the LTC2986HLX#PBF?
The LTC2986HLX#PBF completes a full 10-channel conversion in 255 ms when using the three-cycle mode with simultaneous 50Hz/60Hz rejection enabled. In two-cycle mode, the time reduces to 170 ms - trading some noise rejection for faster update rates in less electrically noisy environments.
Can the LTC2986HLX#PBF measure negative thermocouple voltages?
Yes, the LTC2986HLX#PBF supports direct measurement of negative thermocouple voltages down to –50 mV relative to GND, using its single-supply architecture and rail-to-rail input capability. This enables accurate readings from Type T, E, and J thermocouples at sub-zero temperatures without external level-shifting circuitry.
LTC2986HLX#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Temp Monitoring System (Sensor)
- Sensor Type:
- External
- Sensing Temperature:
- -265°C ~ 1800°C
- Accuracy:
- -
- Topology:
- ADC (Sigma Delta), Multiplexer, Register Bank
- Output Type:
- SPI
- Output Alarm:
- No
- Output Fan:
- No
- Voltage - Supply:
- 2.85V ~ 5.25V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
LTC2986HLX#PBF FAQ
1.How can I place an order for LTC2986HLX#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2986HLX#PBF 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 LTC2986HLX#PBF reliable?
The price and inventory of LTC2986HLX#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2986HLX#PBF is usually 5 days.
3.What payment methods are accepted for LTC2986HLX#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2986HLX#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2986HLX#PBF?
LTC2986HLX#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2986HLX#PBF 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 LTC2986HLX#PBF?
For technical support, including LTC2986HLX#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2986HLX#PBF requirements.
6.How does Aetrix verify that LTC2986HLX#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2986HLX#PBF 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 LTC2986HLX#PBF meets industry standards.
7.What is the process for return or replacement of LTC2986HLX#PBF?
All LTC2986HLX#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2986HLX#PBF, 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 LTC2986HLX#PBF part is unused and in its original packaging.
Return procedure for LTC2986HLX#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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