Analog Devices Inc. LTC2482CDD#PBF

Overview

LTC2482CDD#PBF from Analog Devices (formerly Linear Technology) is a 16-bit + sign delta-sigma ADC with patented Easy Drive input current cancellation, enabling rail-to-rail differential inputs with zero net differential input current. It delivers 600nV RMS noise, 2ppm INL, 1ppm offset error, and simultaneous 50Hz/60Hz line rejection - ideal for direct digitization of high-impedance sensors in precision industrial instrumentation.

For engineers reviewing the LTC2482CDD#PBF datasheet, LTC2482CDD#PBF pinout, LTC2482CDD#PBF application, or LTC2482CDD#PBF equivalent, key selection considerations include its 10-lead DFN package, internal oscillator eliminating external timing components, GND-to-VCC common-mode input range, and support for reference voltages as low as 100mV while maintaining full 16-bit resolution.

Technical Context

The LTC2482CDD#PBF implements a third-order delta-sigma modulator with a no-latency digital filter that settles in a single cycle. Its Easy Drive architecture uses passive sampling networks to cancel dynamic differential input current, allowing direct interface to strain gauges, thermocouples, and bridge sensors without external amplifiers or buffering.

It supports dual clock modes: internal 307.2kHz oscillator (enabling 87dB 50Hz/60Hz rejection) or external fO-driven conversion clock (supporting programmable notch frequencies at fEOSC/5120). The 3-wire SPI-compatible interface operates in either internal or external SCK mode, with automatic mode detection on power-up or CS edge.

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11 = GND), rated for 0°C to 70°C operating temperature.

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 LTC2480CDD#PBF, the LTC2482CDD#PBF uniquely combines zero-differential-input-current operation, built-in 50/60Hz rejection, and ultra-low offset in a minimal 10-lead DFN - making it optimal for space-constrained, high-EMI sensor nodes requiring direct high-impedance interface without calibration overhead.

Availability

LTC2482CDD#PBF is available at Aetrix Electronics and suitable for weight scales, industrial process control systems, and structural monitoring equipment requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for LTC2482CDD#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 LTC2482CDD#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for direct sensor digitization in noise-sensitive, low-power, and space-constrained applications where input buffering degrades accuracy.

FAQ

What is the minimum reference voltage supported by the LTC2482CDD#PBF?

The LTC2482CDD#PBF supports reference voltages as low as 100mV while maintaining full 16-bit resolution and specified noise performance. This capability enables ultra-low-power ratiometric sensor interfaces - for example, pairing with a 100mV bandgap reference to digitize millivolt-level thermocouple outputs without gain stages. The 600nV RMS noise remains independent of VREF, ensuring consistent effective resolution across the entire 0.1V–VCC range.

How does the Easy Drive technology in the LTC2482CDD#PBF eliminate input current errors?

The LTC2482CDD#PBF uses a patented passive sampling network that automatically cancels dynamic differential input current during conversion, eliminating the need for on-chip input buffers. This allows rail-to-rail common-mode signals (GND to VCC) and high-impedance sources (>1MΩ) to be digitized directly - without external op-amps or RC filters - while preserving DC accuracy. The LTC2482CDD#PBF achieves zero net differential input current, preventing voltage drops across source impedances that cause gain and offset errors.

Can the LTC2482CDD#PBF operate without an external crystal or oscillator?

Yes, the LTC2482CDD#PBF integrates a highly accurate trimmed internal oscillator (307.2kHz ±0.5%) that eliminates all external timing components. When Pin fO is tied to GND, the device automatically uses this internal clock to achieve simultaneous 50Hz/60Hz line-frequency rejection with >87dB attenuation - removing crystal layout sensitivity, cost, and board area. External clocks are optional only for custom notch frequencies or synchronization requirements.

What is the function of Pin 1 (GND) on the LTC2482CDD#PBF, and is it mandatory to connect it?

Pin 1 on the LTC2482CDD#PBF is a dedicated GND terminal provided for pin compatibility with the LTC2480/LTC2484 family; it may be left unconnected or driven high/low without affecting operation. The primary ground path is Pin 8 (GND), which serves as the shared analog/digital/reference ground and must be soldered to a low-impedance PCB ground plane. The exposed pad (Pin 11) is also GND and must be soldered for thermal and electrical performance.

Does the LTC2482CDD#PBF support simultaneous rejection of both 50Hz and 60Hz line frequencies?

Yes, the LTC2482CDD#PBF provides simultaneous 50Hz and 60Hz line-frequency rejection with >87dB attenuation in its default internal oscillator mode (fO = GND). This is achieved via a fixed digital filter optimized for 307.2kHz sampling, delivering deep nulls at both fundamental frequencies and their harmonics up to the 255th order - eliminating the need for external analog filters or software-based notch algorithms in globally deployed equipment.