Analog Devices Inc. LTC2493IDE#PBF

Overview

LTC2493IDE#PBF from Analog Devices (formerly Linear Technology) is a 24-bit, 4-channel (2-differential) delta-sigma ADC with Easy Drive input current cancellation, I²C interface, and integrated high-accuracy temperature sensor. It delivers 2 ppm INL, 1 ppm offset error, 600 nV RMS noise, and supports rail-to-rail inputs with 0 V to V_CC common-mode range - enabling direct digitization of high-impedance sensors in industrial process control and precision instrumentation.

For engineers reviewing the LTC2493IDE#PBF datasheet, LTC2493IDE#PBF pinout, LTC2493IDE#PBF application, or LTC2493IDE#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed 14-lead DFN package mapping, real-world use scenarios for temperature-compensated data acquisition, and two rigorously cross-checked alternative parts with documented functional and application differences.

Technical Context

The LTC2493IDE#PBF implements a third-order delta-sigma modulator with decimating FIR filter and auto-calibration engine that performs full offset and full-scale correction every conversion cycle. Its patented Easy Drive architecture eliminates differential input current errors without on-chip buffers, allowing direct connection of high-impedance sources up to 1 MΩ while maintaining DC accuracy.

It features programmable 50 Hz / 60 Hz / simultaneous 50/60 Hz rejection modes, selectable 1× or 2× speed operation (7.5 Hz / 15 Hz output rate), and an internal oscillator (307.2 kHz) - all configurable via I²C. The integrated PTAT temperature sensor provides 1/30 °C resolution and ±2 °C absolute accuracy over –40°C to +85°C.

Key Specifications

Pinout & Package

Package: 14-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 15 = GND). RoHS-compliant, lead-free finish. Operating temperature range: –40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS124S08IPWR and MAX11206ETL+, the LTC2493IDE#PBF uniquely combines I²C simplicity, integrated temperature sensing, hardware AC rejection, and Easy Drive - making it optimal for compact, self-compensating, low-power sensor nodes where board space and calibration overhead are critical.

Availability

LTC2493IDE#PBF is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and temperature-compensated weighing systems requiring stable component supply across extended temperature ranges.

Supply support for LTC2493IDE#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 acquired Linear Technology in 2017 and maintains its high-precision analog product lines, including delta-sigma ADCs engineered for metrology-grade accuracy and robustness in harsh environments.

The LTC2493IDE#PBF belongs to Linear's "No Latency Delta-Sigma" ADC family, designed specifically for applications demanding true single-cycle settling, rail-to-rail input flexibility, and autonomous calibration - targeting industrial, scientific, and medical instrumentation.

FAQ

What is the operating temperature range of the LTC2493IDE#PBF?

The LTC2493IDE#PBF is rated for –40°C to +85°C, matching the "I" grade designation in its part number. This extended range supports deployment in industrial enclosures, outdoor sensor housings, and automotive under-hood environments where ambient temperatures exceed commercial-grade limits. All key specifications - including INL, offset error, and noise - are guaranteed across this full range.

Does the LTC2493IDE#PBF require external components for basic operation?

Yes - the LTC2493IDE#PBF requires a 10 µF tantalum capacitor and 0.1 µF ceramic capacitor on V_CC, pull-up resistors on SDA/SCL (typically 2.2 kΩ to V_CC), and proper grounding of the exposed pad. No external op-amps or RC filters are needed for high-impedance sensor interfacing due to its Easy Drive architecture, but a stable reference (e.g., REF3025) is recommended for metrology-grade accuracy.

How does the Easy Drive technology in the LTC2493IDE#PBF eliminate input current errors?

The LTC2493IDE#PBF uses a proprietary passive sampling network that automatically cancels differential input current at the modulator input stage. This eliminates dynamic current-induced voltage drops across external source impedances - enabling accurate digitization of signals from sources up to 1 MΩ without buffer amplifiers. Common-mode current is minimized by impedance balancing or setting V_CM = V_REF(CM).

Can the LTC2493IDE#PBF measure temperature independently of analog inputs?

Yes - the LTC2493IDE#PBF can be configured to read its internal PTAT temperature sensor exclusively, outputting a calibrated 24-bit value corresponding to die temperature. This mode operates without using any CH0–CH3 pins and provides 1/30 °C resolution with ±2 °C absolute accuracy over –40°C to +85°C - useful for system thermal monitoring or self-compensation algorithms.

What I²C clock frequencies does the LTC2493IDE#PBF support?

The LTC2493IDE#PBF supports standard-mode I²C up to 400 kHz. Its SCL input meets I²C specification timing requirements including t_LOW ≥ 1.3 µs, t_HIGH ≥ 0.6 µs, and t_HD(STA) ≥ 0.6 µs across the full –40°C to +85°C range. The device operates only as an I²C slave and does not generate clock signals - all timing is controlled by the master.