Analog Devices Inc. LTC2492IDE#TRPBF

Overview

LTC2492IDE#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit, 4-channel (2-differential) delta-sigma ADC with Easy Drive input current cancellation, integrated temperature sensor, and programmable 50/60Hz rejection. It delivers 2 ppm INL, 1 µV offset error, 600 nV_RMS noise, and operates from 2.7V to 5.5V supply. It enables direct digitization of high-impedance sensors and rail-to-rail inputs in industrial instrumentation and process control systems.

For engineers reviewing the LTC2492IDE#TRPBF datasheet, LTC2492IDE#TRPBF pinout, LTC2492IDE#TRPBF application, or LTC2492IDE#TRPBF equivalent, key selection criteria include its no-latency digital filter settling in one cycle after channel change, ±2°C absolute temperature sensor accuracy, 14-Lead DFN (4mm × 3mm) package with exposed pad, and support for both internal and external oscillator modes - critical for precision low-power measurement designs.

Technical Context

The LTC2492IDE#TRPBF implements a 3rd-order delta-sigma modulator with decimating FIR filter and auto-calibration circuitry, enabling true no-latency operation: the first conversion after channel or mode reconfiguration is valid. Its patented Easy Drive sampling scheme cancels differential input current dynamically, eliminating errors from source impedance mismatch without requiring on-chip buffers.

It supports dual operating modes: normal speed (15.4 sps at 50Hz rejection) and 2× speed mode (30.8 sps), with configurable line-frequency rejection (50Hz, 60Hz, or simultaneous 50/60Hz). The integrated PTAT temperature sensor provides 1/30°C resolution and is digitized using the same ADC core, sharing reference and calibration paths for correlated accuracy.

Key Specifications

Pinout & Package

The LTC2492IDE#TRPBF is housed in a 14-lead plastic DFN package (4mm × 3mm) with exposed thermal pad (Pin 15, GND), optimized for low thermal resistance and minimal board area. Pin 15 must be soldered to PCB ground plane per datasheet requirement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS124S08IPWR and MAX11206ETX+, the LTC2492IDE#TRPBF uniquely combines Easy Drive input cancellation, GND-to-VCC common-mode range, and an integrated temperature sensor digitized by the same ADC core - enabling simpler, more accurate compensation architectures without external components or calibration overhead.

Availability

LTC2492IDE#TRPBF is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and temperature-compensated sensor systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC2492IDE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2492IDE#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for high-accuracy, low-power, multi-channel sensor digitization in harsh industrial environments where noise immunity, thermal stability, and ease of use are critical.

FAQ

What is the operating temperature range of the LTC2492IDE#TRPBF?

The LTC2492IDE#TRPBF is rated for operation from –40°C to +85°C (Industrial grade). This is confirmed in the Absolute Maximum Ratings table and Order Information section, where "IDE" suffix denotes the Industrial temperature range. The device maintains full specification compliance-including 2 ppm INL and ±2°C temperature sensor accuracy-across this entire range.

Does the LTC2492IDE#TRPBF require external reference components?

No, the LTC2492IDE#TRPBF does not require external reference components to operate. It accepts an external differential reference (REF+ and REF–) but can also use internal references in certain configurations. However, the datasheet specifies that for on-chip temperature measurement, the minimum VREF must be 2V - meaning an external reference is necessary to meet that condition. The device itself contains no internal voltage reference; all accuracy depends on the applied VREF.

How does the Easy Drive technology in the LTC2492IDE#TRPBF eliminate input current errors?

The LTC2492IDE#TRPBF uses a patented sampling scheme that automatically cancels differential input current by balancing charge injection across complementary sampling phases. This eliminates dynamic errors caused by source impedance mismatch - allowing direct connection to high-impedance sensors (e.g., thermocouples, pH electrodes) without external buffers or matched resistor networks, while preserving DC accuracy and linearity.

Can the LTC2492IDE#TRPBF measure its own die temperature accurately?

Yes, the LTC2492IDE#TRPBF integrates a PTAT (proportional-to-absolute-temperature) sensor with 1/30°C resolution and ±2°C absolute accuracy over –40°C to +85°C. The temperature voltage is digitized by the same 24-bit ADC core and reference path used for analog inputs, ensuring correlated thermal tracking and eliminating inter-path offset drift - critical for precision temperature compensation.

What is the function of the fO pin on the LTC2492IDE#TRPBF?

The fO pin (Pin 1) on the LTC2492IDE#TRPBF controls the conversion clock source. When tied to GND, it selects the internal 307.2kHz oscillator for standard 50/60Hz rejection. When driven by an external clock (10kHz–1MHz), it overrides the internal oscillator, enabling custom output data rates and adjustable notch frequencies - essential for systems operating in non-standard AC environments or requiring synchronized sampling.