Analog Devices Inc. DC1628A

Overview

DC1628A from Analog Devices (formerly Linear Technology) is an evaluation board for the LTC2470 and LTC2472 16-bit delta-sigma ADCs with integrated 1.25V precision reference. It supports both single-ended (LTC2470) and differential (LTC2472) configurations, operates from 2.7V to 5.5V, delivers selectable 208sps or 833sps output rates, and features <1mV offset error, 0.01% gain error, and 2µA max sleep current. It is used for rapid validation of high-accuracy, low-power sensor signal chains in industrial monitoring and embedded data acquisition.

For engineers reviewing the DC1628A datasheet, DC1628A pinout, DC1628A application, or DC1628A equivalent, this page provides verified hardware interface details, SPI timing constraints, reference startup behavior, conversion settling characteristics, and direct integration guidance for LTC2470/LTC2472-based designs requiring sub-LSB linearity and µA-level power management.

Technical Context

The DC1628A implements a complete, ready-to-run evaluation platform for the LTC2470/LTC2472 family, featuring on-board 0.1µF REFOUT and COMP decoupling capacitors, 10µF VCC bulk capacitance, and configurable jumpers for VREF sourcing, input topology (single-ended vs. differential), and SDI logic level (GND/VDD tie for fixed SPD mode). It exposes all 12 pins of the DFN or MSOP package via test points and a 0.1"-spaced header for oscilloscope probing and microcontroller interfacing.

It validates key system-level behaviors including no-latency serial output (16-bit MSB-first SPI), automatic NAP/SLEEP state transitions, reference startup time dependency on C_COMP/C_REFOUT, and transition noise performance (<3µV_RMS) under real-world PCB layout conditions - directly supporting design-in decisions for battery-powered environmental sensors and precision process controllers.

Key Specifications

Availability

DC1628A is available at Aetrix Electronics and suitable for industrial process control, environmental sensor calibration, and embedded ADC upgrade programs requiring stable component supply, traceable evaluation hardware, and documented reference design validation.

Supply support for DC1628A 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 technologies, serving precision instrumentation, industrial automation, and medical device markets.

The DC1628A belongs to Analog Devices' Linear Technology Evaluation Board product line, designed specifically to accelerate prototyping and qualification of ultra-low-power, high-resolution delta-sigma ADCs in resource-constrained embedded systems.

FAQ

What is the primary function of the DC1628A evaluation board?

The DC1628A evaluation board is a fully assembled and tested platform for evaluating the LTC2470 and LTC2472 16-bit delta-sigma ADCs. It enables immediate verification of key performance parameters - including offset error (<±1mV), gain error (±0.01%), reference drift (≤10ppm/°C), and sleep current (≤2µA) - without custom PCB development. The DC1628A provides direct access to all critical signals for oscilloscope measurement and microcontroller integration.

Does the DC1628A support both LTC2470 and LTC2472 variants?

Yes, the DC1628A supports both the LTC2470 (single-ended input) and LTC2472 (differential input) devices. Jumper configuration allows users to select the appropriate input topology, and the board's pinout matches both the 12-lead DFN and MSOP packages. All documentation, schematics, and layout files for DC1628A explicitly confirm dual-device compatibility per Linear Technology's official evaluation board release.

How does the DC1628A validate the LTC2470/LTC2472 reference startup behavior?

The DC1628A uses factory-installed 0.1µF capacitors on REFOUT and COMP pins - matching the exact values specified in the LTC2470/LTC2472 datasheet for 12ms reference startup time. This configuration has been measured and documented in the DC1628A user guide to ensure accurate validation of reference settling, transition noise (<3µV_RMS), and first-conversion discard timing - critical for low-power multiplexed sensor systems.

Can the DC1628A be used to verify SPI timing compliance for the LTC2470/LTC2472?

Yes, the DC1628A provides direct test points for CS, SCK, SDI, and SDO, enabling oscilloscope validation of all SPI timing parameters per the LTC2470/LTC2472 datasheet: t_KQ ≤100ns, t_lSCK/t_hSCK ≥250ns, setup/hold ≥100ns, and f_SCK ≤2MHz. The board's layout minimizes trace inductance and maintains controlled impedance, ensuring reliable timing margin testing across temperature and supply voltage ranges.

Is external power supply filtering required when using the DC1628A?

No - the DC1628A integrates a 10µF bulk capacitor in parallel with a low-ESR 0.1µF ceramic capacitor on the VCC rail, as mandated by the LTC2470/LTC2472 datasheet for stable operation. This dual-capacitor network has been verified to suppress supply ripple and maintain PSRR >80dB across 10Hz–1MHz, eliminating the need for additional external filtering during evaluation.