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Analog Devices Inc. LTC2498IUHF#PBF
- Part No.:
- LTC2498IUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2498IUHF#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,002
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Product details
Overview
LTC2498IUHF#PBF from Analog Devices (formerly 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 precision industrial data acquisition.
For engineers reviewing the LTC2498IUHF#PBF datasheet, LTC2498IUHF#PBF pinout, LTC2498IUHF#PBF application, or LTC2498IUHF#PBF equivalent, key selection criteria include its no-latency ΔΣ architecture (single-cycle digital filter settling), GND-to-VCC common-mode input range independent of reference, 2ppm INL, and QFN-38 (5mm × 7mm) package with exposed thermal pad.
Technical Context
The LTC2498IUHF#PBF implements a patented sampling scheme that auto-cancels differential input current, eliminating dynamic errors and obviating on-chip buffering. Its 3rd-order decimating FIR filter provides simultaneous 50Hz/60Hz rejection without latency, and the internal oscillator (307.2kHz nominal) enables fixed-rate conversions at 7.5sps (1×) or 15sps (2× speed mode).
It integrates a PTAT-based temperature sensor with 93.5µV/°C coefficient and 27.8–28.2mV output at 27°C, alongside a 16-channel analog multiplexer with break-before-make timing (50ns). The SPI-compatible 4-wire interface supports both internal and external clock modes, with SCK configurable as input or output at power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full code coverage across full-scale range. |
| INL | 2ppm of VREF - ensures ±0.0002% linearity error over full scale, critical for calibration-grade measurements. |
| Offset Error | ±0.5µV typical - enables sub-microvolt DC accuracy without system-level trimming. |
| RMS Noise | 600nV RMS - supports 20.5+ ENOB at 7.5sps, suitable for strain gauge and thermopile digitization. |
| Input Common-Mode Range | GND to VCC - allows direct interfacing with sensors operating at rail voltages, independent of reference voltage. |
| Temperature Sensor Accuracy | ±2°C absolute - enables on-chip cold-junction compensation and system health monitoring without external sensors. |
| Power Supply | 2.7V to 5.5V - supports single-supply operation across battery, industrial, and USB-powered systems. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial environments where ambient stability is required. |
Pinout & Package
Package: 38-lead plastic QFN (5mm × 7mm), exposed pad (Pin 39) tied to GND and required to be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,3,4,5,6,31,32,33) | Ground reference and return path | Eight dedicated ground pins minimize impedance and improve PSRR; all must connect to low-impedance 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 voltage (GND–0.3V to VCC+0.3V). |
| COM (Pin 7) | Common negative input | Serves as IN– for all single-ended configurations; defines reference point for unipolar sensor interfaces. |
| MUXOUTP/N (Pins 24,27) | Multiplexer output terminals | Enable sharing of external amplifiers across all channels; reduce component count in multi-sensor systems. |
| ADCINP/N (Pins 25,26) | ADC input terminals | Differential inputs to modulator; accept buffered or directly connected MUX outputs with auto-calibrated offset drift removal. |
| REF+/REF– (Pins 29,30) | Differential reference inputs | Set full-scale range (0.1V ≤ VREF ≤ VCC); REF+ must exceed REF– by ≥0.1V; supports internal temp sensor only when VREF ≥ 2V. |
| SDI/SDO/SCK/CS (Pins 34,37,38,36) | 4-wire SPI interface | CS-active-low enables conversion and I/O; SCK bidirectional (input for external clock, output for internal); SDI configures mode/channel; SDO outputs 32-bit result or status. |
| fO (Pin 35) | Frequency control input | Selects internal oscillator (GND/VCC) or external clock (10–1000kHz); determines conversion rate and filter null placement. |
Key Features
| Feature | Design Value |
|---|---|
| No Latency ΔΣ Architecture | Digital filter settles in one conversion cycle - first reading after channel change is valid, eliminating wait states in multiplexed systems. |
| Easy Drive Input Current Cancellation | Zero net differential input current - eliminates voltage drop across source impedances up to 100kΩ, preserving DC accuracy. |
| Integrated Temperature Sensor | 1/30°C resolution and ±2°C absolute accuracy - enables self-compensated measurements without external thermal components. |
| Programmable Line Frequency Rejection | 50Hz, 60Hz, or simultaneous dual-frequency rejection - suppresses mains interference in lab, factory, and medical equipment. |
| Auto-Calibration Engine | Continuous offset and gain drift removal - maintains accuracy over time and temperature without user intervention or recalibration cycles. |
| Low-Power Sleep Mode | 1µA typical supply current - extends battery life in portable instrumentation and remote sensor nodes. |
Applications
| High-Precision Weigh Scales | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Digitizing mV-level outputs from load cells and bridge sensors in factory-floor weighing systems. IC Role / Device Role / Timing Role: Primary ADC with integrated Easy Drive cancellation, eliminating need for external instrumentation amplifiers and reducing board space. Use Value: 600nV RMS noise and 2ppm INL enable <10ppm total unadjusted error - meeting OIML R76 Class III requirements without system calibration. |
Use Scenario: Monitoring pressure, flow, and temperature in PLC analog input modules with multi-sensor polling. IC Role / Device Role / Timing Role: 16-channel multiplexed ADC with automatic channel switching and valid-first-conversion behavior. Use Value: No-latency architecture and simultaneous 50/60Hz rejection ensure stable readings in electrically noisy plant environments. |
| Medical Patient Monitoring | Environmental Data Loggers |
|
Use Scenario: Capturing biopotential signals (ECG, EEG) and transducer outputs in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail input ADC with integrated temperature sensor for on-board cold-junction compensation. Use Value: ±0.5µV offset and GND-to-VCC input range allow direct connection to isolated front-end stages without level-shifting. |
Use Scenario: Long-term logging of soil moisture, air quality, and ambient temperature using battery-powered wireless nodes. IC Role / Device Role / Timing Role: Ultra-low-power ADC with 1µA sleep current and internal oscillator - minimizes energy per measurement. Use Value: Integrated temperature sensor and auto-calibration eliminate need for external references or periodic recalibration in field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IRHBT | 24-bit, 8-channel, 30ksps max, no integrated temp sensor, requires external reference and buffer | Higher speed but lacks Easy Drive and on-chip temperature sensing - needs additional components for same functionality | Choose for throughput-critical applications where external signal conditioning is already present |
| MAX11206ETJ+ | 24-bit, 8-channel, 10ksps, integrated PGA (1–128), no temp sensor, 3.3V-only supply | Includes programmable gain but no temperature sensor or simultaneous 50/60Hz rejection - limited supply flexibility | Prefer when variable-gain front-end is needed and industrial temp range is not required |
Compared with ADS1258IRHBT and MAX11206ETJ+, the LTC2498IUHF#PBF uniquely combines integrated temperature sensing, zero-differential-input-current operation, and simultaneous line-frequency rejection in a single 38-pin QFN - reducing BOM count and layout complexity for precision multi-sensor systems.
Availability
LTC2498IUHF#PBF is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and environmental data logging requiring stable component supply across extended temperature ranges.
Supply support for LTC2498IUHF#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2498IUHF#PBF belongs to Linear's No Latency ΔΣ ADC product line, designed specifically for high-accuracy, low-power, multi-channel data acquisition in noise-sensitive industrial and medical applications.
FAQ
What is the operating temperature range of the LTC2498IUHF#PBF?
The LTC2498IUHF#PBF is rated for –40°C to +85°C operation, making it suitable for industrial environments where ambient conditions vary widely. This grade ('I') is confirmed in the Absolute Maximum Ratings table and distinguishes it from the 'C' (0°C to 70°C) and 'H' (–40°C to 125°C) variants. All electrical specifications in the datasheet marked with 'l' apply across this full range.
Does the LTC2498IUHF#PBF require an external reference voltage?
No - the LTC2498IUHF#PBF accepts an external differential reference (REF+ and REF–), but it does not require one for internal temperature measurements. When measuring its on-chip sensor, VREF must be ≥2V; otherwise, the device uses the applied reference to set full-scale range for analog inputs. No internal reference is generated - external sourcing is mandatory for analog conversion.
How does Easy Drive technology work in the LTC2498IUHF#PBF?
Easy Drive in the LTC2498IUHF#PBF uses a patented sampling scheme that automatically cancels differential input current during acquisition. This eliminates dynamic errors caused by source impedance mismatch and removes the need for on-chip input buffers - allowing rail-to-rail input signals and high-impedance sensors (e.g., RTDs, thermocouples) to be digitized directly with full DC accuracy.
Can the LTC2498IUHF#PBF perform simultaneous 50Hz and 60Hz rejection?
Yes - the LTC2498IUHF#PBF supports simultaneous 50Hz/60Hz rejection mode via its programmable digital filter. When enabled (via SDI command), the FIR filter places nulls at both frequencies, suppressing mains-induced noise in globally deployed equipment without requiring hardware changes or region-specific firmware variants.
What is the function of the fO pin on the LTC2498IUHF#PBF?
The fO pin on the LTC2498IUHF#PBF controls the conversion clock source: tying it to GND or VCC selects the internal 307.2kHz oscillator; driving it with an external clock (10–1000kHz) overrides the internal oscillator to adjust output data rate and reposition digital filter nulls. This enables flexible trade-offs between speed, noise, and line-frequency rejection.
LTC2498IUHF#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 ~ 85°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2498IUHF#PBF FAQ
1.How can I place an order for LTC2498IUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2498IUHF#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 LTC2498IUHF#PBF reliable?
The price and inventory of LTC2498IUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2498IUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2498IUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2498IUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2498IUHF#PBF?
LTC2498IUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2498IUHF#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 LTC2498IUHF#PBF?
For technical support, including LTC2498IUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2498IUHF#PBF requirements.
6.How does Aetrix verify that LTC2498IUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2498IUHF#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 LTC2498IUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2498IUHF#PBF?
All LTC2498IUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2498IUHF#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 LTC2498IUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2498IUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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