Analog Devices Inc. LTC2498IUHF#TRPBF

Overview

LTC2498IUHF#TRPBF 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 GND-to-VCC common-mode range - used in high-precision industrial data acquisition systems requiring direct digitization of high-impedance sensors.

For engineers reviewing the LTC2498IUHF#TRPBF datasheet, LTC2498IUHF#TRPBF pinout, LTC2498IUHF#TRPBF application, or LTC2498IUHF#TRPBF equivalent, key selection criteria include its no-latency ΔΣ architecture (single-cycle digital filter settling), 2ppm INL, 1ppm offset error, 38-pin QFN package (5mm × 7mm), and support for both internal and external oscillator clocking - critical for EMI-sensitive, low-drift measurement designs.

Technical Context

The LTC2498IUHF#TRPBF implements a patented sampling scheme that auto-cancels differential input current, eliminating dynamic errors without on-chip buffering. Its 3rd-order decimating FIR filter enables simultaneous 50Hz/60Hz rejection and guarantees no missing codes across its full 24-bit resolution.

It integrates a PTAT-based temperature sensor (27.8–28.2mV at 27°C, 93.5µV/°C coefficient) and supports flexible channel configuration via SPI: any combination of single-ended or differential inputs can be selected, with first-conversion validity after channel change and MUXOUT access for shared external amplifiers.

Key Specifications

Pinout & Package

38-lead plastic QFN package (5mm × 7mm), exposed pad (Pin 39) soldered to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.

Compared with ADS1256IDBT and MAX11206ETN+, the LTC2498IUHF#TRPBF uniquely combines 16-channel flexibility, simultaneous dual-frequency rejection, integrated temperature sensing, and rail-to-rail input operation - making it optimal for compact, self-compensating industrial data loggers where layout space and calibration complexity must be minimized.

Availability

LTC2498IUHF#TRPBF is available at Aetrix Electronics and suitable for industrial process control, precision test equipment, and environmental monitoring systems requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for LTC2498IUHF#TRPBF 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#TRPBF belongs to Linear's No Latency ΔΣ ADC product line, designed specifically for high-accuracy, low-drift, multi-channel data acquisition in harsh industrial and scientific environments.

FAQ

What is the operating temperature range of the LTC2498IUHF#TRPBF?

The LTC2498IUHF#TRPBF is rated for –40°C to +85°C operation (I-grade), validated across this full range for parameters including INL (2ppm), offset error (0.5µV), and PSRR (140dB). This makes LTC2498IUHF#TRPBF suitable for deployment in uncontrolled industrial cabinets, outdoor enclosures, and automotive under-hood telemetry systems where ambient temperatures fluctuate widely.

Does the LTC2498IUHF#TRPBF require external passive components for basic operation?

Yes - the LTC2498IUHF#TRPBF requires a 10µF tantalum capacitor and 0.1µF ceramic capacitor on VCC (Pin 28), plus 0.1µF capacitors on REF+ and REF– (Pins 29,30) for stable reference decoupling. No external crystal or oscillator is needed unless overriding the internal 307.2kHz clock via the fO pin (Pin 35); the LTC2498IUHF#TRPBF functions autonomously with these minimal passives.

How does the Easy Drive technology in the LTC2498IUHF#TRPBF improve measurement accuracy with high-impedance sensors?

Easy Drive technology in the LTC2498IUHF#TRPBF cancels differential input current dynamically during sampling, eliminating voltage errors across sensor source impedances up to 10MΩ. Unlike traditional buffered inputs, this allows direct connection of thermistors, RTDs, and piezoresistive sensors to LTC2498IUHF#TRPBF without gain/offset drift from buffer bias currents - preserving 24-bit integrity without external op-amps.

Can the LTC2498IUHF#TRPBF measure its own die temperature, and how accurate is that reading?

Yes - the LTC2498IUHF#TRPBF integrates a PTAT temperature sensor with 1/30°C resolution and ±2°C absolute accuracy over –40°C to +85°C. The sensor output is accessible via SPI command and calibrated at wafer test; its 93.5µV/°C coefficient and tight 27.8–28.2mV span at 27°C enable reliable on-chip thermal compensation for drift correction in the LTC2498IUHF#TRPBF's analog front-end.

What SPI interface modes does the LTC2498IUHF#TRPBF support, and how is clock source selected?

The LTC2498IUHF#TRPBF supports both internal and external SCK modes. Clock source is determined by the logic state on SCK (Pin 38) at power-up or CS falling edge: high = internal SCK output (38.4kHz), low = external SCK input (up to 4MHz). This dual-mode flexibility lets designers choose between deterministic timing (internal) or synchronized multi-device operation (external) without hardware changes - a key feature of the LTC2498IUHF#TRPBF's 4-wire interface.