Analog Devices Inc. LTC2499IUHF#TRPBF

Overview

LTC2499IUHF#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit, 16-channel (8-differential) delta-sigma ADC with Easy Drive input current cancellation, I²C interface, integrated temperature sensor, and no-latency digital filtering. It operates from 2.7V to 5.5V, delivers 600nV RMS noise, 2ppm INL, and supports simultaneous 50Hz/60Hz rejection - enabling high-accuracy direct digitization of rail-to-rail, high-impedance sensor signals in industrial data acquisition systems.

For engineers reviewing the LTC2499IUHF#TRPBF datasheet, LTC2499IUHF#TRPBF pinout, LTC2499IUHF#TRPBF application, or LTC2499IUHF#TRPBF equivalent, key selection criteria include its guaranteed no-missing-codes resolution, ±2°C absolute temperature sensor accuracy, 38-pin QFN package with exposed thermal pad, programmable rejection modes, and seamless channel switching without settling delay.

Technical Context

The LTC2499IUHF#TRPBF implements a third-order delta-sigma modulator with decimating FIR filter and auto-calibration per conversion cycle, eliminating offset and full-scale drift across temperature, supply, and channel changes. Its patented Easy Drive front end cancels differential input current dynamically, allowing direct connection of sensors with source impedances up to 100kΩ while maintaining DC accuracy.

It features a 2-wire I²C interface supporting 27 unique addresses plus global sync, internal 307.2kHz oscillator (or external clock via fO pin), and flexible input configuration: any mix of single-ended or differential channels selected via register writes. The integrated PTAT temperature sensor provides 1/30°C resolution with factory-trimmed 2°C absolute accuracy over –40°C to +85°C.

Key Specifications

Pinout & Package

38-lead (5mm × 7mm) plastic QFN package with exposed thermal pad (Pin 39 = GND). All seven ground pins (1, 4, 6, 31–34) must be soldered to PCB ground plane for proper operation and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS124S08IPBSR and MAX11206ETX+, the LTC2499IUHF#TRPBF uniquely combines I²C simplicity, on-chip temperature sensing with ±2°C accuracy, and simultaneous 50/60Hz rejection in a single 38-pin QFN - making it optimal for space-constrained, globally deployed industrial data loggers requiring minimal external components.

Availability

LTC2499IUHF#TRPBF is available at Aetrix Electronics and suitable for industrial process monitoring, high-accuracy data loggers, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LTC2499IUHF#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 LTC2499IUHF#TRPBF belongs to Linear's precision delta-sigma ADC product line, designed specifically for high-accuracy, low-power, multichannel data acquisition in harsh industrial and medical environments where noise immunity, long-term stability, and ease of integration are critical.

FAQ

What is the operating temperature range of the LTC2499IUHF#TRPBF?

The LTC2499IUHF#TRPBF is rated for –40°C to +85°C industrial temperature range, validated across all electrical specifications including INL, offset error, and temperature sensor accuracy. This range is confirmed in the Absolute Maximum Ratings table and applies to all performance parameters unless otherwise noted in the Electrical Characteristics section.

Does the LTC2499IUHF#TRPBF require external precision resistors or op-amps for sensor interfacing?

No - the LTC2499IUHF#TRPBF's Easy Drive technology cancels differential input current automatically, enabling direct connection of high-impedance sensors (e.g., RTDs, thermistors) without external buffers or precision resistors. Its rail-to-rail input common-mode range (GND to VCC) and integrated auto-calibration further eliminate the need for external trimming components.

How does the LTC2499IUHF#TRPBF achieve simultaneous 50Hz and 60Hz rejection?

The LTC2499IUHF#TRPBF achieves simultaneous 50Hz/60Hz rejection through a digitally configurable FIR filter structure synchronized to an internal 280kHz oscillator (when fO = GND). This creates dual-notch response at both frequencies within a single conversion cycle - verified in Typical Performance Characteristics Figure G23 and Applications Information section.

Can the LTC2499IUHF#TRPBF measure its own die temperature accurately?

Yes - the LTC2499IUHF#TRPBF integrates a factory-trimmed PTAT temperature sensor with ±2°C absolute accuracy over –40°C to +85°C and 1/30°C resolution. The sensor output is accessible via dedicated I²C register reads and requires no external components, enabling real-time thermal compensation of ADC performance.

What is the significance of the exposed thermal pad (Pin 39) on the LTC2499IUHF#TRPBF?

The exposed thermal pad (Pin 39) on the LTC2499IUHF#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to ensure proper thermal dissipation (θJA = 34°C/W) and low-noise grounding. Leaving it unconnected degrades both thermal performance and analog measurement accuracy due to increased junction temperature and ground impedance.