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Analog Devices Inc. LTC2498HUHF#PBF
- Part No.:
- LTC2498HUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2498HUHF#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,539
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Product details
Overview
LTC2498HUHF#PBF from Analog Devices (acquired Linear Technology) is a 24-bit, 16-channel (8-differential) delta-sigma ADC with Easy Drive input current cancellation, integrated temperature sensor (±2°C absolute accuracy, 1/30°C resolution), and programmable 50Hz/60Hz/simultaneous rejection. It operates from 2.7V to 5.5V, delivers 600nV RMS noise, and supports rail-to-rail inputs with zero differential input current - enabling direct digitization of high-impedance sensors in industrial process control systems.
For engineers reviewing the LTC2498HUHF#PBF datasheet, LTC2498HUHF#PBF pinout, LTC2498HUHF#PBF application, or LTC2498HUHF#PBF equivalent, key selection criteria include its H-grade operating range (–40°C to 125°C), 2ppm INL, 1ppm offset error, 2x speed mode (15Hz), and 38-lead QFN package with exposed ground pad - all critical for high-accuracy, thermally demanding measurement designs.
Technical Context
The LTC2498HUHF#PBF implements a 3rd-order delta-sigma modulator with decimating FIR filter and auto-calibration engine that continuously removes offset and drift from shared external amplifiers. Its patented Easy Drive sampling scheme cancels differential input current dynamically, eliminating errors from source impedance mismatch.
It features dual-clock operation: internal oscillator at 307.2kHz (enabling simultaneous 50Hz/60Hz rejection) or external clock via fO pin (10–1000kHz). The 4-wire SPI interface supports both internal and external SCK modes, with configurable channel selection, line-frequency rejection, and temperature sensor activation via SDI commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit, no missing codes - guarantees monotonicity and full dynamic range utilization across all 16 channels. |
| INL | 2 ppm of VREF - enables sub-µV-level linearity for precision weigh scales and strain gauge interfaces. |
| Offset Error | 0.5 µV typical - eliminates need for system-level offset trimming in low-drift instrumentation. |
| RMS Noise | 600 nV - supports 21.5 effective number of bits (ENOB) at 7.5 SPS for ultra-low-noise sensor digitization. |
| Temp Sensor Accuracy | ±2°C absolute, 1/30°C resolution - provides on-chip thermal compensation without external sensor calibration. |
| Supply Range | 2.7V to 5.5V - allows direct integration with 3.3V and 5V industrial control rails and battery-backed systems. |
| Operating Temp | –40°C to 125°C (H-grade) - qualified for under-hood automotive, motor drive feedback, and harsh-environment industrial use. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed ground pad (Pin 39), requiring soldering to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,3–6,31–33) | Ground reference | Eight dedicated GND pins minimize ground bounce and improve PSRR; all must connect to common ground plane. |
| CH0–CH15 (Pins 8–23) | Analog input channels | Configurable as 16 single-ended or 8 differential inputs; support rail-to-rail common-mode range (GND to VCC). |
| COM (Pin 7) | Common negative input | Serves as IN– for all single-ended configurations; voltage range extends beyond supply rails (–0.3V to VCC+0.3V). |
| MUXOUTP/N (Pins 24,27) | Multiplexer outputs | Enable sharing of external amplifiers across all channels; output swing matches input common-mode range. |
| ADCINP/N (Pins 25,26) | ADC analog inputs | Differential inputs to modulator; accept buffered or direct MUXOUT signals with full DC accuracy. |
| REF+/REF– (Pins 29,30) | Differential reference | Set full-scale range (0.1V to VCC); REF+ must exceed REF– by ≥0.1V; min 2V required for internal temp measurement. |
| SDI/SDO/SCK/CS (Pins 34,37,38,36) | 4-wire SPI interface | Supports both internal and external clock modes; CS wake-up enables ultra-low sleep current (1µA). |
| fO (Pin 35) | Frequency control | Selects internal oscillator (307.2kHz) or external clock (10–1000kHz) to configure data rate and notch filter placement. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive™ Input Current Cancellation | Eliminates dynamic input current errors - enables direct connection to >10MΩ sensors without gain/offset degradation. |
| No Latency ΔΣ Architecture | Digital filter settles in one cycle after channel change - first conversion is valid, removing pipeline delay in multiplexed systems. |
| Programmable Line-Frequency Rejection | Hardware-configurable 50Hz, 60Hz, or simultaneous dual-notch filtering - suppresses mains interference without firmware overhead. |
| Integrated Temperature Sensor | On-die PTAT sensor with 93.5 µV/°C coefficient - provides real-time die temperature for thermal drift compensation in precision measurements. |
| Auto-Calibration Engine | Continuously removes offset and drift from shared external amplifiers - reduces BOM count and improves long-term stability. |
Applications
| Industrial Process Control | High-Accuracy Weigh Scales |
|---|---|
Use Scenario: Monitoring pressure, flow, and level transmitters in chemical plants with 4–20mA loop-powered sensors. IC Role / Device Role / Timing Role: Direct digitization of ratiometric bridge outputs and thermocouple signals with simultaneous 50/60Hz rejection in noisy plant environments. Use Value: Eliminates external instrumentation amplifiers and line-frequency filters, reducing board area by 35% while maintaining ±0.005% full-scale accuracy over –40°C to 125°C. | Use Scenario: Load cell readout in platform scales and hopper weighing systems requiring NTEP certification. IC Role / Device Role / Timing Role: 24-bit sigma-delta conversion of millivolt-level bridge outputs with 600nV RMS noise floor and 2ppm INL. Use Value: Achieves 1:1,000,000 resolution (21.5 ENOB) at 7.5 SPS, meeting Class III and Class IIIL metrology requirements without external averaging. |
| Motor Drive Current Sensing | Medical Instrumentation |
Use Scenario: Isolated shunt-based phase current measurement in industrial inverters and servo drives. IC Role / Device Role / Timing Role: Digitizing isolated amplifier outputs with rail-to-rail input capability and 1ppm offset drift - critical for torque ripple minimization. Use Value: Enables <100ppm total unadjusted error over temperature, supporting vector control algorithms with <0.1% current loop error at 125°C junction temperature. | Use Scenario: High-fidelity biopotential signal acquisition in patient monitors and diagnostic ECG modules. IC Role / Device Role / Timing Role: Low-noise, low-drift digitization of microvolt-level electrode signals with integrated temperature compensation for skin-electrode interface drift. Use Value: Delivers 120dB CMRR at 60Hz and 110dB NMR at 50Hz - exceeds IEC 60601-2-27 immunity requirements without external guard traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IRTCR | 24-bit, 8-channel, 10kSPS max, no integrated temp sensor, requires external reference, 32-QFN (5×5mm) | Higher speed but lower DC accuracy (7ppm INL, ±10µV offset); lacks simultaneous 50/60Hz rejection and Easy Drive | Preferred when throughput >1kSPS is required and external calibration infrastructure exists. |
| MAX11206ETL+ | 24-bit, 8-channel, 128SPS max, integrated oscillator, 20ppm INL, 10ppm offset, 32-TQFN (5×5mm) | Lower linearity and higher noise (1.2µVRMS); no programmable dual-notch filter or on-chip temperature sensor | Cost-optimized alternative where ±0.002% linearity and simultaneous 50/60Hz rejection are not required. |
Compared with ADS1258IRTCR and MAX11206ETL+, the LTC2498HUHF#PBF delivers superior DC precision (2ppm INL vs. 7ppm/20ppm), integrated thermal sensing for drift compensation, and hardware-selectable simultaneous 50/60Hz rejection - making it uniquely suited for Class I metrology and thermally unstable industrial environments.
Availability
LTC2498HUHF#PBF is available at Aetrix Electronics and suitable for industrial process control, high-accuracy weigh scales, and motor drive current sensing requiring stable component supply across extended temperature ranges.
Supply support for LTC2498HUHF#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC2498HUHF#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for high-resolution, low-drift, multichannel data acquisition in thermally demanding industrial and instrumentation applications.
FAQ
What is the operating temperature range for the LTC2498HUHF#PBF?
The LTC2498HUHF#PBF is rated for –40°C to +125°C (H-grade), validated across this full range for parameters including INL (2ppm), offset error (0.5µV), and conversion current (160–275µA). This makes LTC2498HUHF#PBF suitable for under-hood automotive, motor drive, and industrial control applications where ambient temperatures exceed standard commercial or industrial grades.
Does the LTC2498HUHF#PBF require an external reference voltage?
No - the LTC2498HUHF#PBF accepts an external differential reference (REF+ and REF–) but does not require it; it can operate with internal reference derived from VCC. However, for guaranteed 24-bit performance and 2ppm INL, a stable external reference (e.g., LT6657) is recommended. The LTC2498HUHF#PBF supports reference voltages from 0.1V to VCC, with minimum 2V required for internal temperature sensor operation.
How does the Easy Drive technology in the LTC2498HUHF#PBF eliminate input current errors?
The LTC2498HUHF#PBF uses a patented sampling scheme that automatically cancels differential input current by balancing charge injection across successive sampling phases. This eliminates dynamic errors caused by source impedance mismatch - allowing LTC2498HUHF#PBF to maintain full 24-bit accuracy even with sensor impedances exceeding 10MΩ and rail-to-rail input common-mode voltages (GND to VCC).
Can the LTC2498HUHF#PBF measure temperature directly?
Yes - the LTC2498HUHF#PBF integrates a high-accuracy on-die PTAT temperature sensor with 1/30°C resolution and ±2°C absolute accuracy over –40°C to 125°C. It is accessed by configuring the input mux to the internal sensor channel; no external components are needed. The sensor output is digitized alongside analog inputs using the same 24-bit converter core, enabling synchronized thermal compensation.
What are the power consumption characteristics of the LTC2498HUHF#PBF in different operating modes?
In normal conversion mode, the LTC2498HUHF#PBF draws 160–275µA depending on VCC and temperature; in 2x speed mode, current increases to 200–300µA. In Sleep mode (CS HIGH), it consumes only 1µA - enabling ultra-low-power data loggers. Total power dissipation remains below 0.8mW at 5V, making LTC2498HUHF#PBF suitable for battery-operated and energy-constrained industrial nodes.
LTC2498HUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 8, 16
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2498HUHF#PBF FAQ
1.How can I place an order for LTC2498HUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2498HUHF#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 LTC2498HUHF#PBF reliable?
The price and inventory of LTC2498HUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2498HUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2498HUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2498HUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2498HUHF#PBF?
LTC2498HUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2498HUHF#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 LTC2498HUHF#PBF?
For technical support, including LTC2498HUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2498HUHF#PBF requirements.
6.How does Aetrix verify that LTC2498HUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2498HUHF#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 LTC2498HUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2498HUHF#PBF?
All LTC2498HUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2498HUHF#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 LTC2498HUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2498HUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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