Analog Devices Inc. LTC2489IDE#TRPBF

Overview

LTC2489IDE#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, no-latency delta-sigma ADC with integrated I²C interface, Easy Drive input current cancellation, and 4-channel (2-differential/4-single-ended) multiplexed analog inputs. It delivers 2 ppm INL, 1 ppm offset error, 600 nV RMS noise, simultaneous 50 Hz/60 Hz rejection, and operates from 2.7 V to 5.5 V supply - enabling direct digitization of high-impedance sensors in industrial temperature monitoring systems.

For engineers reviewing the LTC2489IDE#TRPBF datasheet, LTC2489IDE#TRPBF pinout, LTC2489IDE#TRPBF application, or LTC2489IDE#TRPBF equivalent, key selection considerations include its rail-to-rail common-mode input range (GND to VCC), zero differential input current, auto-calibration per conversion, internal oscillator, and guaranteed no missing codes across –40°C to +85°C.

Technical Context

The LTC2489IDE#TRPBF implements a 3rd-order delta-sigma modulator with decimating FIR filter and automatic offset/full-scale calibration on every conversion cycle. Its patented Easy Drive front end eliminates dynamic differential input current via passive sampling network cancellation - enabling direct connection of thermistors, RTDs, and bridge sensors without external buffers.

It features a 2-wire I²C interface with 9 pin-selectable addresses plus global sync address, supports standard/fast mode (up to 400 kHz), and uses an internal 307.2 kHz oscillator (fO = GND) or external clock for configurable data rate and notch placement - all while maintaining DC accuracy over full industrial temperature range.

Key Specifications

Pinout & Package

Package: 14-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 15 = GND, must be soldered).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS114S08IPBS and MAX11206ETL+, the LTC2489IDE#TRPBF uniquely combines I²C compatibility, zero differential input current, simultaneous 50/60 Hz rejection, and industrial temperature rating in a compact DFN - making it optimal for space-constrained, high-EMI, battery-aware sensor nodes requiring minimal external components.

Availability

LTC2489IDE#TRPBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and medical sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2489IDE#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 LTC2489IDE#TRPBF belongs to ADI's legacy Linear Technology precision delta-sigma ADC product line, designed specifically for direct high-impedance sensor digitization in harsh, space-constrained, and low-power environments.

FAQ

What is the operating temperature range of the LTC2489IDE#TRPBF?

The LTC2489IDE#TRPBF is rated for –40°C to +85°C, meeting industrial temperature requirements. This grade is confirmed by the "I" suffix in the part number and specified in the Absolute Maximum Ratings table. The device maintains full performance including 2 ppm INL and 1 µV offset error across this range, with calibration active on every conversion to compensate for thermal drift.

Does the LTC2489IDE#TRPBF require an external oscillator?

No, the LTC2489IDE#TRPBF includes an integrated 307.2 kHz oscillator. When the fO pin is tied to GND, the device uses this internal clock for conversion timing and automatic 50 Hz/60 Hz rejection. An external clock may be applied to fO only if custom data rates or notch frequencies are needed - otherwise, no external timing components are required for basic operation.

How does the Easy Drive technology in the LTC2489IDE#TRPBF eliminate input current errors?

The LTC2489IDE#TRPBF uses a patented passive sampling network that automatically cancels differential input current at the modulator input stage. This eliminates dynamic errors caused by source impedance mismatch, allowing direct connection of high-impedance sensors (e.g., thermistors >1 MΩ) without external buffers - while preserving DC accuracy and rail-to-rail input capability.

Can the LTC2489IDE#TRPBF measure both differential and single-ended signals on the same device?

Yes, the LTC2489IDE#TRPBF supports configurable input modes: it can operate as either 2 differential channels (CH0–CH1, CH2–CH3) or 4 single-ended channels (CH0–COM, CH1–COM, CH2–COM, CH3–COM). The COM pin serves as the common negative input for all single-ended configurations, and channel selection is performed via I²C register writes - enabling flexible sensor interfacing in one IC.

What is the I²C address configuration method for the LTC2489IDE#TRPBF?

The LTC2489IDE#TRPBF uses two hardware pins - CA0 and CA1 - to configure its I²C address. Each pin accepts three states (LOW, HIGH, FLOAT), yielding nine unique 7-bit addresses. No external EEPROM or configuration registers are needed; address selection is fixed at power-up based on PCB routing. A tenth global address enables synchronized conversions across multiple devices on the same bus.