Analog Devices Inc. LTC2484CDD#TRPBF

Overview

LTC2484CDD#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit no-latency delta-sigma analog-to-digital converter with patented Easy Drive input current cancellation, enabling rail-to-rail differential inputs (±0.5×VREF) and direct digitization of high-impedance sensors without external buffering. It delivers 600nV_RMS noise, 2ppm INL, and simultaneous 50Hz/60Hz line rejection - used in precision weight scales and industrial process control systems.

For engineers reviewing the LTC2484CDD#TRPBF datasheet, LTC2484CDD#TRPBF pinout, LTC2484CDD#TRPBF application, or LTC2484CDD#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed 10-lead DFN package mapping, real-world application cards, and two rigorously cross-checked alternative parts for sensor digitization designs requiring ultra-low offset drift and zero differential input current.

Technical Context

The LTC2484CDD#TRPBF implements a third-order delta-sigma modulator with automatic transparent offset and full-scale calibration, achieving no missing codes across its 24-bit output. Its Easy Drive architecture cancels differential input current via passive sampling network timing, eliminating dynamic errors from source impedance mismatch.

It supports programmable line-frequency rejection (50Hz, 60Hz, or simultaneous dual-mode) using either its internal 307.2kHz oscillator or an external clock on fO pin. The serial interface operates in 4-wire SPI mode with CS-controlled sleep/wake cycles, and SCK bidirectionality enables both internal clock output and external clock input modes.

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11 = GND), RoHS-compliant, tape-and-reel delivery (TRPBF suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS124S08IPWR and MAX11206ETL+, the LTC2484CDD#TRPBF uniquely combines zero differential input current, programmable dual-line rejection, and rail-to-rail input range - making it the only option that eliminates external buffering *and* delivers guaranteed 50/60Hz immunity in a single chip for commercial-temperature sensor digitization.

Availability

LTC2484CDD#TRPBF is available at Aetrix Electronics and suitable for weight scales, industrial process controllers, and structural strain monitoring systems requiring stable component supply, long-lifecycle support, and guaranteed commercial-temperature grade performance.

Supply support for LTC2484CDD#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, formed through the acquisition of Linear Technology in 2017.

The LTC2484CDD#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for direct digitization of high-impedance sensors in industrial, test, and measurement applications where bufferless interface and line-noise immunity are mandatory.

FAQ

What is the operating temperature range for the LTC2484CDD#TRPBF?

The LTC2484CDD#TRPBF is rated for 0°C to 70°C ambient operation - designated by the "C" grade in the part number. This commercial temperature range is validated across all key specifications including offset error (0.5µV typ), INL (2ppm), and noise (0.6µV_RMS). It is not rated for extended industrial or automotive ranges; for –40°C to 85°C operation, the LTC2484IDD#TRPBF variant must be selected.

Does the LTC2484CDD#TRPBF require an external crystal or oscillator?

No, the LTC2484CDD#TRPBF includes a trimmed internal oscillator operating at 307.2kHz, eliminating the need for external crystals, resonators, or clock generators. When Pin 10 (fO) is grounded, the device uses this internal clock for conversion timing and automatic 50Hz/60Hz rejection. An external clock may be applied to fO only if custom data rates or alternate rejection frequencies are required - not for basic operation.

How does Easy Drive technology eliminate input current errors in the LTC2484CDD#TRPBF?

Easy Drive in the LTC2484CDD#TRPBF uses a patented passive sampling network and timing scheme that automatically cancels differential input current at the sampling nodes (IN+, IN–). This removes dynamic errors caused by source impedance imbalance, allowing direct connection of high-impedance sensors like strain gauges and RTDs without op-amp buffers. Common-mode current is minimized by matching impedances or referencing common-mode to VREF/2.

Can the LTC2484CDD#TRPBF reject both 50Hz and 60Hz simultaneously?

Yes, the LTC2484CDD#TRPBF supports simultaneous 50Hz and 60Hz line frequency rejection in a single conversion cycle - enabled by default when SDI is grounded. This mode uses an internal digital filter null centered at both frequencies, achieving ≥87dB normal-mode rejection. No configuration register writes or external components are needed; it is a hardware-defined feature of the delta-sigma modulator architecture.

What is the function of the exposed pad (Pin 11) on the LTC2484CDD#TRPBF DFN package?

The exposed pad (Pin 11) on the LTC2484CDD#TRPBF is electrically connected to GND and must be soldered to the PCB ground plane for thermal and electrical performance. It reduces thermal resistance (θ_JA = 43°C/W) and provides low-impedance return path for analog/digital currents. Leaving it floating degrades noise performance and may cause thermal derating; prototyping boards must include thermal vias connecting the pad to inner ground layers.