Analog Devices Inc. LTC2400CS8#TRPBF

Overview

LTC2400CS8#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit micropower delta-sigma ADC in SO-8 package, delivering 4ppm INL, 0.3ppm RMS noise, and single-cycle settling for multiplexed sensor interfaces. It operates from 2.7V to 5.5V, integrates an internal oscillator, and supports 50Hz/60Hz notch filtering-ideal for precision weight scales and strain-gage transducers.

For engineers reviewing the LTC2400CS8#TRPBF datasheet, LTC2400CS8#TRPBF pinout, LTC2400CS8#TRPBF application, or LTC2400CS8#TRPBF equivalent, key selection criteria include its live-zero extended input range (–12.5% to +112.5% VREF), no-latency output, 3-wire SPI/MICROWIRE interface, and auto-calibration per conversion cycle.

Technical Context

The LTC2400CS8#TRPBF employs a delta-sigma modulator with integrated decimating FIR filter and on-chip auto-calibration that corrects offset and full-scale errors every conversion cycle. Its digital filter provides ≥110dB rejection at 50Hz or 60Hz ±2% when FO is tied to VCC or GND, respectively.

It supports dual clock modes: internal oscillator (no external components) or external clock applied to FO pin (2.56–307.2kHz), enabling user-defined notch frequency at f_EOSC/2560. The 3-wire interface operates in either internal SCK (SCK as output) or external SCK (SCK as input) mode, selected automatically at power-up based on SCK pin state.

Key Specifications

Pinout & Package

Package: 8-lead plastic SO (SO-8), 150 mil width, JEDEC MS-012AC compliant. Pin pitch: 1.27 mm. Thermal resistance θ_JA = 130°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS124S08IPW and MAX11200EEE+, the LTC2400CS8#TRPBF uniquely combines internal oscillator-based 50/60Hz rejection, live-zero input range, and per-conversion auto-calibration in a minimal SO-8 footprint-making it optimal for cost-sensitive, single-channel, mains-immune precision measurement.

Availability

LTC2400CS8#TRPBF is available at Aetrix Electronics and suitable for weight scales, direct temperature measurement, gas analyzers, and strain-gage transducers requiring stable component supply and long-term production continuity.

Supply support for LTC2400CS8#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 LTC2400CS8#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy sensor digitization in environments with strong 50/60Hz interference and demanding long-term stability requirements.

FAQ

What is the maximum recommended reference voltage for LTC2400CS8#TRPBF?

The LTC2400CS8#TRPBF accepts reference voltages from 0.1V up to VCC. For optimal performance, Analog Devices recommends using VREF between 2.5V and 5V. At VREF = 5V, the device achieves its specified 4ppm INL and 0.3ppm RMS noise. Higher VREF improves SNR margin but does not increase effective resolution beyond the 24-bit no-missing-codes guarantee. The LTC2400CS8#TRPBF's input range remains proportional to VREF (–0.125×VREF to +1.125×VREF), so scaling VREF directly adjusts full-scale sensitivity.

Does LTC2400CS8#TRPBF require external passive components for its internal oscillator?

No, the LTC2400CS8#TRPBF requires no external components for its internal oscillator. The oscillator is fully integrated and factory-trimmed, enabling immediate 50Hz or 60Hz notch filtering upon connecting FO to VCC or GND. This eliminates crystal, capacitor, or resistor dependencies-reducing BOM count, board area, and qualification effort. The LTC2400CS8#TRPBF's internal oscillator delivers ≥110dB rejection at the selected line frequency without any external tuning or calibration.

How does the LTC2400CS8#TRPBF handle input signals outside its normal range?

The LTC2400CS8#TRPBF implements a live-zero extended input range of –0.125×VREF to +1.125×VREF. Inputs within this range are converted linearly with full 24-bit resolution. Signals beyond this range are clamped: VIN < –0.125×VREF yields the minimum code; VIN > +1.125×VREF yields the maximum code. This behavior prevents saturation-induced errors from upstream sensor offset or gain miscalibration. The LTC2400CS8#TRPBF's status bits (EXR and SIG) flag extended-range conditions in real time, enabling host firmware to detect and manage overrange events.

Can LTC2400CS8#TRPBF operate with an external clock source, and what are the constraints?

Yes, the LTC2400CS8#TRPBF supports external clocking via the FO pin. The external oscillator frequency f_EOSC must be 2.56–307.2kHz, with high/low periods between 0.5–390µs. The resulting notch frequency is f_EOSC/2560 (e.g., 100Hz notch at 256kHz). The LTC2400CS8#TRPBF automatically disables its internal oscillator when a valid external signal is detected. This mode enables synchronization to system clocks or custom rejection frequencies-extending utility beyond standard 50/60Hz environments.

What is the function of the FO pin on LTC2400CS8#TRPBF, and how does it affect conversion timing?

The FO pin on LTC2400CS8#TRPBF selects the notch frequency and determines conversion time. FO = VCC configures 50Hz rejection with 160ms conversion time; FO = GND selects 60Hz rejection with 133ms conversion time; FO driven externally sets notch at f_EOSC/2560 with conversion time = 20480/f_EOSC (ms). The FO pin has no effect on the 3-wire interface timing or data format-the LTC2400CS8#TRPBF maintains identical 32-bit output structure and SDO/SCK timing regardless of FO configuration.