Analog Devices Inc. LTC2435-1CGN#PBF

Overview

LTC2435-1CGN#PBF from Analog Devices (formerly Linear Technology) is a 20-bit micropower delta-sigma ADC with differential input and reference, 13.75Hz output rate, simultaneous 50Hz/60Hz line rejection (>87dB), 3ppm INL, and 0.8ppm RMS noise - designed for high-precision sensor digitization in industrial instrumentation and weigh scales.

For engineers reviewing the LTC2435-1CGN#PBF datasheet, LTC2435-1CGN#PBF pinout, LTC2435-1CGN#PBF application, or LTC2435-1CGN#PBF equivalent, key selection criteria include its dual-line-frequency rejection capability, GND-to-VCC common-mode input/reference flexibility, single-cycle settling for multiplexed sensors, and SSOP-16 package compatibility with SO-8 footprints.

Technical Context

The LTC2435-1CGN#PBF implements a decimating FIR digital filter synchronized to an internal oscillator or external clock, enabling notch rejection at both 50Hz and 60Hz ±2% simultaneously without external components. Its autocalibration architecture performs full-scale correction every conversion cycle, ensuring stable gain over temperature and supply voltage.

It operates in three distinct states - conversion, sleep, and data output - controlled via CS, SCK, and FO pins. The 3-wire SPI/MICROWIRE-compatible interface supports both internal and external clock modes, with SDO providing 24-bit serial output on falling SCK edges and status indication during sleep.

Key Specifications

Pinout & Package

Package: 16-lead plastic SSOP (GN), 0.150" wide, SO-8 footprint compatible, RoHS-compliant lead-free finish.

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#PBF, the LTC2435-1CGN#PBF uniquely balances 20-bit precision, dual-line-frequency immunity, micropower operation, and SSOP-16 footprint - making it optimal for cost-sensitive, globally deployed industrial sensors where layout area and EMI robustness are critical.

Availability

LTC2435-1CGN#PBF is available at Aetrix Electronics and suitable for industrial process control, precision weigh scales, and strain gage transducer applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for LTC2435-1CGN#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2435-1CGN#PBF belongs to ADI's precision delta-sigma ADC product line, engineered specifically for low-power, high-accuracy sensor digitization in electrically noisy environments - emphasizing ease of use, minimal external components, and guaranteed metrology-grade performance.

FAQ

What is the primary function of the FO pin on the LTC2435-1CGN#PBF?

The FO (Frequency Control) pin on the LTC2435-1CGN#PBF configures the device's line-frequency rejection behavior. When FO is tied to GND, the LTC2435-1CGN#PBF enables simultaneous 50Hz and 60Hz rejection (≥87dB) using its internal oscillator. Unlike the LTC2435 variant, FO = VCC is not supported for 50Hz-only mode on the LTC2435-1CGN#PBF - grounding FO is the sole method to activate its dual-frequency capability. This pin must be hardwired before power-up to ensure correct filter initialization.

Does the LTC2435-1CGN#PBF require external calibration components?

No, the LTC2435-1CGN#PBF performs full-scale auto-calibration every conversion cycle without external components. It uses an internal DAC and decimating FIR filter to correct gain drift in real time, eliminating the need for trim pots, calibration registers, or periodic factory recalibration. Offset is factory-trimmed to ≤5mV and drifts <100nV/°C - no user calibration is required for stable operation across –40°C to 85°C. The LTC2435-1CGN#PBF achieves this while maintaining its 13.75Hz output rate and dual-line-frequency rejection.

What is the maximum allowable reference voltage range for the LTC2435-1CGN#PBF?

The LTC2435-1CGN#PBF accepts a differential reference voltage (VREF = REF+ – REF–) from 0.1V to VCC, with REF+ and REF– independently configurable anywhere between GND and VCC - provided REF+ remains at least 0.1V above REF–. For example, with VCC = 3.3V, valid configurations include REF+ = 3.3V / REF– = 0V (3.3V reference) or REF+ = 2.5V / REF– = 1.0V (1.5V reference). This flexibility enables direct ratiometric sensing with bridge excitations or low-voltage references, and is explicitly specified in the Absolute Maximum Ratings and Electrical Characteristics tables of the LTC2435-1CGN#PBF datasheet.

Can the LTC2435-1CGN#PBF interface directly with a microcontroller SPI port?

Yes, the LTC2435-1CGN#PBF supports standard 3-wire SPI and MICROWIRE protocols without protocol translation. Its SDO pin outputs 24-bit data on the falling edge of SCK, and CS serves as chip select. In internal-clock mode (default), SCK functions as an output at ~17.5kHz; in external-clock mode, SCK becomes an input accepting up to 2MHz clocks. No configuration registers or software initialization are needed - timing is hardware-determined by CS/SCK/FO states. This plug-and-play interface simplifies integration with ARM Cortex-M, PIC, and ESP32 microcontrollers using standard SPI peripherals.

What is the operating temperature range for the LTC2435-1CGN#PBF part number?

Based on the official Linear Technology (now Analog Devices) order information table, the LTC2435-1CGN#PBF is rated for 0°C to 70°C ambient operating temperature. This "C" grade version uses the 16-lead plastic SSOP (GN) package and is intended for commercial and industrial applications where extended temperature operation is not required. For –40°C to 85°C operation, the equivalent part is LTC2435-1IGN#PBF - the "I" grade variant with identical electrical specifications but qualified for wider temperature extremes.