Analog Devices Inc. LTC2420IS8#TRPBF

Overview

LTC2420IS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower 20-bit delta-sigma analog-to-digital converter in SO-8 package, featuring 8 ppm INL, 1.2 ppm RMS noise, and single-cycle digital filter settling. It operates from 2.7V to 5.5V, draws only 200 µA supply current, and supports extended input range (–12.5% to +112.5% VREF) for strain gauge and precision weight scale front-ends.

For engineers reviewing the LTC2420IS8#TRPBF datasheet, LTC2420IS8#TRPBF pinout, LTC2420IS8#TRPBF application, or LTC2420IS8#TRPBF equivalent, this page delivers verified specifications, SO-8 terminal mapping, 50/60 Hz notch configuration logic, SPI/MICROWIRE interface timing, and validated alternatives for high-accuracy, low-power industrial sensing designs.

Technical Context

The LTC2420IS8#TRPBF implements a no-latency ∆Σ architecture with integrated oscillator and decimating FIR filter, enabling accurate conversions after input steps without settling delay. Its auto-calibrating ADC core performs offset and full-scale correction every cycle, ensuring stability over temperature, supply variation, and time.

Filter rejection is programmable via the FO pin: tied to GND for 60 Hz ±2% notch (110 dB min), tied to VCC for 50 Hz ±2% notch (110 dB min), or driven by external clock (1 Hz–800 Hz) for user-defined notch frequency at f_EOSC/2560. Reference voltage range is 0.1 V to V_CC, supporting live-zero operation and sensor overrange tolerance.

Key Specifications

Pinout & Package

Package: 8-lead plastic SO (SO-8), 150 mil width, JEDEC MS-012AC compliant. Moisture sensitivity level (MSL) 1, RoHS-compliant, Pb-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-accuracy, low-power ADC applications.

Compared with ADS124S08IPWR and LTC2418CGN#PBF, the LTC2420IS8#TRPBF offers optimal balance of 20-bit accuracy, ultra-low power, integrated notch filtering, and SO-8 footprint-making it ideal for cost- and size-constrained single-channel industrial sensors where 50/60 Hz immunity is critical and 24-bit resolution is unnecessary.

Availability

LTC2420IS8#TRPBF is available at Aetrix Electronics and suitable for weight scales, strain gauge transducers, and gas analyzers requiring stable component supply, long-term lifecycle support, and guaranteed authenticity through authorized distribution channels.

Supply support for LTC2420IS8#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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2420IS8#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy sensor signal acquisition in harsh electromagnetic environments where 50/60 Hz interference is prevalent.

FAQ

What is the operating temperature range for the LTC2420IS8#TRPBF?

The LTC2420IS8#TRPBF is rated for –40°C to +85°C (Industrial grade). This range is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications unless otherwise noted. The device maintains 8 ppm INL and 110 dB 50/60 Hz rejection across this full range, with offset drift of only 0.04 ppm/°C of V_REF. No derating or external compensation is required for operation within these limits.

Does the LTC2420IS8#TRPBF require external components for 50 Hz or 60 Hz rejection?

No, the LTC2420IS8#TRPBF does not require external components for 50 Hz or 60 Hz rejection. When the FO pin is tied to V_CC, it configures the internal oscillator for 50 Hz ±2% notch (≥110 dB rejection); when tied to GND, it configures for 60 Hz ±2% notch. The internal oscillator and digital filter are fully integrated - no crystals, capacitors, or external clocks are needed to achieve specified rejection performance.

How does the extended input range of the LTC2420IS8#TRPBF improve system design?

The LTC2420IS8#TRPBF supports an extended input range of –0.125 × V_REF to +1.125 × V_REF, which directly addresses real-world sensor interface challenges. It allows seamless handling of amplifier offset, thermal drift, and transducer overrange conditions without clamping or additional signal conditioning. For example, in a weigh scale using a 2.5 V reference, the LTC2420IS8#TRPBF accepts inputs from –312.5 mV to +2.8125 V - eliminating the need for external level-shifting circuitry and reducing BOM count and calibration effort.

Is the LTC2420IS8#TRPBF pin compatible with other devices in its family?

Yes, the LTC2420IS8#TRPBF is pin compatible with the LTC2400 series (e.g., LTC2400CGN#PBF). Both share identical SO-8 pinout, power sequencing, and 3-wire interface behavior. The LTC2420IS8#TRPBF outputs 24 bits (4 status + 20 data), while the LTC2400 outputs 32 bits - but timing is matched so that the LTC2420IS8#TRPBF can be clocked with 32 SCK pulses, with the final 8 bits always HIGH, enabling drop-in replacement in existing LTC2400 layouts.

What is the significance of "no latency" in the LTC2420IS8#TRPBF delta-sigma architecture?

"No latency" means the LTC2420IS8#TRPBF's digital filter settles in a single conversion cycle - there is no delay between input step and valid output. Unlike conventional delta-sigma ADCs requiring multiple cycles to settle after range changes or multiplexer switching, the LTC2420IS8#TRPBF delivers each output word corresponding precisely to the immediately preceding conversion. This enables true real-time multiplexed sampling of multiple sensors without inter-channel crosstalk or timing uncertainty.