Analog Devices Inc. LTC2473CDD#PBF

Overview

LTC2473CDD#PBF from Analog Devices (formerly Linear Technology) is a 16-bit differential ΔΣ analog-to-digital converter with integrated 1.25V precision reference, I²C interface, and selectable 208sps/833sps output rate. It operates from 2.7V to 5.5V, delivers ±1 mV offset error and ±0.01% gain error, and targets high-accuracy sensor digitization in industrial monitoring systems.

For engineers reviewing the LTC2473CDD#PBF datasheet, LTC2473CDD#PBF pinout, LTC2473CDD#PBF application, or LTC2473CDD#PBF equivalent, key selection criteria include its differential input range (±V_REF), 2µA max sleep current, 2ppm/°C reference drift (C-grade), and DFN-12 (3mm × 3mm) package compatibility with space-constrained PCB layouts.

Technical Context

The LTC2473CDD#PBF implements a delta-sigma architecture with oversampling ratios of 8,192 (208sps) or 2,048 (833sps), enabling relaxed anti-aliasing filter requirements. Its proprietary input sampling scheme limits average input current to 50nA, minimizing loading on external sensor circuits.

It features single-cycle conversion settling-no latency or filter delay-and supports automatic power-down after conversion (NAP mode) or full shutdown including reference (SLEEP mode). The internal oscillator eliminates external timing components, and I²C communication uses open-drain SDA with 400kHz max clock frequency.

Key Specifications

Pinout & Package

Package: 12-lead plastic DFN (3mm × 3mm), exposed pad (Pin 13) must be connected to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1115IDGSR and MCP3424-E/SL, the LTC2473CDD#PBF uniquely combines low-drift reference (±2ppm/°C), differential input, configurable output rate, and 2µA sleep current-making it optimal for high-accuracy, low-power industrial sensing where reference integrity and input loading are design constraints.

Availability

LTC2473CDD#PBF is available at Aetrix Electronics and suitable for industrial process control, environmental monitoring, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed C-grade temperature performance (0°C to 70°C).

Supply support for LTC2473CDD#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 LTC2473CDD#PBF belongs to ADI's precision delta-sigma ADC product line, engineered for applications demanding high resolution, low power, and integrated reference stability-especially in sensor signal chains where board space and calibration overhead are constrained.

FAQ

What is the maximum operating temperature range for the LTC2473CDD#PBF?

The LTC2473CDD#PBF is specified for the C-grade temperature range of 0°C to 70°C. This is confirmed in the Absolute Maximum Ratings and Order Information tables of the official datasheet. Devices marked with "I" (e.g., LTC2473IDD#PBF) support –40°C to 85°C, but the CDD suffix explicitly denotes the commercial grade. Always verify ambient and junction temperature limits in thermal design.

Does the LTC2473CDD#PBF require external components for basic operation?

Yes-the LTC2473CDD#PBF requires three mandatory external capacitors: 0.1µF on REFOUT to GND, 0.1µF on COMP to GND, and 10µF + 0.1µF on VCC to GND. These ensure reference stability, low-noise operation, and supply decoupling. No external clock or reference IC is needed due to the integrated oscillator and precision reference.

How does the LTC2473CDD#PBF handle overrange and underrange input conditions?

The LTC2473CDD#PBF clamps output codes at 0 (all zeros) for differential inputs ≤ –V_REF, and at 65535 (all ones) for inputs ≥ +V_REF. This behavior is defined in the Output Data Format section of the datasheet and ensures deterministic digital output under fault or saturation conditions without wraparound or undefined states.

Can the LTC2473CDD#PBF be used with a 3.3V microcontroller I²C bus?

Yes-the LTC2473CDD#PBF supports I²C logic levels compatible with 3.3V systems: VIH = 0.7×VCC (min), VIL = 0.3×VCC (max), and SDA is open-drain with 3mA sink capability. When VCC = 3.3V, the part accepts 2.31V as high and 0.99V as low, aligning with standard 3.3V I²C specifications and eliminating level-shifter requirements.

What is the purpose of the A0 pin on the LTC2473CDD#PBF?

The A0 pin configures the device's 7-bit I²C slave address: tying A0 to GND selects address 0010100 (0x24), while tying A0 to VCC selects 1010100 (0x54). This allows two LTC2473CDD#PBF devices to share the same I²C bus without address conflict-critical in multi-channel sensor modules or modular data acquisition systems.