Analog Devices Inc. LTC2435IGN#TRPBF

Overview

LTC2435IGN#TRPBF from Analog Devices (formerly Linear Technology) is a 20-bit micropower delta-sigma ADC with differential input and reference, single-cycle settling, 3ppm INL, 0.8ppm RMS noise, and internal oscillator-designed for high-precision industrial sensor digitization in weight scales, strain gage transducers, and gas analyzers.

For engineers reviewing the LTC2435IGN#TRPBF datasheet, LTC2435IGN#TRPBF pinout, LTC2435IGN#TRPBF application, or LTC2435IGN#TRPBF equivalent, key selection criteria include its 50Hz/60Hz simultaneous line rejection (LTC2435-1 variant), –40°C to +85°C operating range, SSOP-16 package, 200µA active / 4µA sleep current, and flexible 3-wire SPI-compatible interface.

Technical Context

The LTC2435IGN#TRPBF implements a decimating FIR-based delta-sigma modulator with auto-calibration per conversion cycle, delivering true no-latency output. Its digital filter is synchronized to an internal oscillator or external clock (5–2000 kHz), enabling programmable notch placement at f_EOSC/2560.

It supports dual-mode operation: internal SCK output (17.5–19.2 kHz) or external SCK input (≤2 MHz), with CS-controlled state transitions between conversion, sleep, and 24-bit serial data output-requiring no configuration registers or software initialization.

Key Specifications

Pinout & Package

Package: 16-lead plastic SSOP (GN), 0.150" wide, SO-8 footprint compatible, –40°C to +85°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS124S08IPW and LTC2440IGN#TRPBF, the LTC2435IGN#TRPBF uniquely delivers guaranteed 50/60 Hz simultaneous rejection in a micropower, no-external-components package-making it optimal for globally deployed, maintenance-free instrumentation where mains noise immunity is non-negotiable.

Availability

LTC2435IGN#TRPBF is available at Aetrix Electronics and suitable for industrial process control, precision weighing systems, and portable gas analyzers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2435IGN#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 LTC2435 series belongs to Linear's precision delta-sigma ADC product line, engineered specifically for low-power, high-accuracy sensor digitization in harsh industrial and scientific environments.

FAQ

What is the operating temperature range of the LTC2435IGN#TRPBF?

The LTC2435IGN#TRPBF is rated for –40°C to +85°C operation, matching the "I" grade specification defined in the datasheet. This extended range ensures reliable performance in industrial control cabinets, outdoor instrumentation, and automotive test equipment where ambient temperatures exceed commercial limits. The LTC2435IGN#TRPBF maintains full 20-bit linearity and 3 ppm INL across this entire span without derating.

Does the LTC2435IGN#TRPBF require external passive components for its internal oscillator?

No, the LTC2435IGN#TRPBF integrates a precision internal oscillator that requires zero external components-unlike crystal-referenced ADCs. This eliminates BOM cost, board space, and startup-time uncertainty. The oscillator directly drives the digital filter, enabling guaranteed 50 Hz, 60 Hz, or simultaneous 50/60 Hz rejection depending on the FO pin state. The LTC2435IGN#TRPBF achieves this while consuming only 200 µA in conversion mode.

How does the LTC2435IGN#TRPBF achieve simultaneous 50 Hz and 60 Hz line rejection?

The LTC2435IGN#TRPBF achieves simultaneous 50 Hz and 60 Hz rejection by configuring its digital FIR filter to place nulls at both frequencies using its internal oscillator in LTC2435-1 mode (FO = GND). This is implemented in hardware-not firmware-and guarantees ≥87 dB normal-mode rejection across 49–61.2 Hz. The LTC2435IGN#TRPBF delivers this capability without external clock sources or configuration registers, making it ideal for globally deployed instrumentation.

What is the function of the seven GND pins on the LTC2435IGN#TRPBF SSOP-16 package?

The seven GND pins (1, 7, 8, 9, 10, 15, 16) on the LTC2435IGN#TRPBF provide separate low-impedance return paths for analog, digital, and power-ground currents-minimizing crosstalk and improving PSRR and CMRR. All seven must be connected to a solid ground plane; splitting or omitting any degrades noise performance and line rejection. This architecture enables the LTC2435IGN#TRPBF to achieve 120 dB DC common-mode rejection and 140 dB 50/60 Hz rejection in real-world layouts.

Can the LTC2435IGN#TRPBF interface directly with a microcontroller SPI port without level-shifting?

Yes-the LTC2435IGN#TRPBF's 3-wire digital interface is SPI- and MICROWIRE-compatible with logic thresholds defined for 2.7–5.5 V operation: VIH ≥ 2.5 V (at VCC ≥ 4.5 V), VIL ≤ 0.8 V. Its SDO output drives to VCC – 0.5 V high and 0.4 V low under load, matching standard 3.3 V or 5 V MCU GPIO levels. No level-shifter is needed when interfacing with common microcontrollers, simplifying design and reducing bill-of-materials for the LTC2435IGN#TRPBF.