Analog Devices Inc. LTC2480HMS#PBF

Overview

LTC2480HMS#PBF from Analog Devices (formerly Linear Technology) is a 16-bit plus sign no-latency delta-sigma analog-to-digital converter with patented Easy Drive input current cancellation. It delivers 2 ppm INL, 1 ppm offset error, and simultaneous 50 Hz/60 Hz line rejection in a 10-lead MSOP package, operating from 2.7V to 5.5V supply. It directly digitizes rail-to-rail differential inputs up to ±0.5·VREF/GAIN with full DC accuracy-ideal for precision weight scales and strain gauge transducers.

For engineers reviewing the LTC2480HMS#PBF datasheet, LTC2480HMS#PBF pinout, LTC2480HMS#PBF application, or LTC2480HMS#PBF equivalent, key selection criteria include guaranteed –40°C to 125°C operation, programmable gain (1–256), internal oscillator, and zero differential input current enabling direct high-impedance sensor interfacing without external buffering.

Technical Context

The LTC2480HMS#PBF implements a third-order delta-sigma modulator with continuous auto-calibration of offset and full-scale errors. Its Easy Drive sampling scheme cancels dynamic differential input current, eliminating errors caused by source impedance mismatch and obviating on-chip input buffers.

It supports three line-rejection modes (50 Hz, 60 Hz, or simultaneous 50/60 Hz) and a 2× speed mode (15 Hz output rate using internal oscillator). The device uses an internal trimmed oscillator (307.2 kHz nominal) or accepts external clock via fO pin, with conversion times ranging from 131.0 ms (60 Hz mode, H-grade) to 72.2 ms (2× speed, 60 Hz mode, H-grade).

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (3.0 mm × 3.0 mm × 1.0 mm), exposed pad (GND), –40°C to 125°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS124S08IPWR and MAX11206ETK+, the LTC2480HMS#PBF uniquely combines 16-bit precision with zero-differential-input-current operation, programmable gain, and guaranteed –40°C to 125°C performance-making it optimal for ruggedized, high-impedance sensor interfaces where layout simplicity and thermal robustness are critical.

Availability

LTC2480HMS#PBF is available at Aetrix Electronics and suitable for weight scales, strain gauge transducers, direct temperature measurement, and industrial process control requiring stable component supply across extended temperature environments.

Supply support for LTC2480HMS#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2480HMS#PBF belongs to Linear's precision delta-sigma ADC product line, engineered for direct sensor digitization in harsh environments-emphasizing low-noise, low-drift, and high common-mode rejection for industrial and test equipment.

FAQ

What is the guaranteed operating temperature range for the LTC2480HMS#PBF?

The LTC2480HMS#PBF is specified for continuous operation from –40°C to +125°C, with all electrical parameters-including INL, offset error, full-scale error, and line rejection-fully guaranteed across this extended range. This H-grade qualification makes LTC2480HMS#PBF suitable for under-hood automotive, industrial control, and outdoor instrumentation applications where thermal stress is critical.

How does the Easy Drive technology in the LTC2480HMS#PBF eliminate input current errors?

The LTC2480HMS#PBF uses a patented sampling scheme that automatically cancels differential input current at both IN+ and IN– terminals. This eliminates dynamic current-induced voltage drops across external source impedances, allowing rail-to-rail inputs with large external resistors (e.g., thermistor bias networks or long sensor cables) to be digitized without gain or offset degradation-no external op-amp buffering required.

Can the LTC2480HMS#PBF reject both 50 Hz and 60 Hz line noise simultaneously?

Yes, the LTC2480HMS#PBF supports a dedicated simultaneous 50 Hz/60 Hz rejection mode with ≥87 dB attenuation. This is achieved through its adaptive digital filter architecture and internal oscillator configuration (280 kHz ±2%), enabling reliable operation in globally deployed equipment without hardware or firmware changes for regional AC line frequency differences.

What is the maximum programmable gain of the LTC2480HMS#PBF, and how is it configured?

The LTC2480HMS#PBF offers programmable gain from 1 to 256 in eight discrete steps (1, 2, 4, 8, 16, 32, 64, 256). Gain is set via a 3-bit field in the 8-bit configuration command shifted into the SDI pin during initialization. This allows precise matching of the ADC's input range to low-output sensors (e.g., 2 mV/V load cells) without external amplification-reducing component count and noise sources.

Does the LTC2480HMS#PBF require an external crystal or oscillator?

No, the LTC2480HMS#PBF includes an on-chip trimmed oscillator (307.2 kHz nominal) that eliminates the need for external timing components. When fO is tied to GND, the device operates autonomously with guaranteed performance over –40°C to 125°C. An external clock may be applied to fO only if custom data rates or enhanced filter null placement are required-otherwise, no external oscillator is necessary for LTC2480HMS#PBF operation.