Analog Devices Inc. DC2289A-A

Overview

DC2289A-A from Analog Devices (formerly Linear Technology) is a fully assembled, tested evaluation board for the LTC2380-24 24-bit, 2 Msps SAR ADC. It provides a complete signal chain with precision reference, low-noise analog front-end, and SPI interface to host systems - enabling rapid validation of high-resolution data acquisition in seismology, energy exploration, and medical imaging applications.

For engineers reviewing the DC2289A-A datasheet, DC2289A-A pinout, DC2289A-A application, or DC2289A-A equivalent, this board delivers production-ready layout, calibrated performance at full 24-bit no-missing-codes resolution, real-time digital averaging (N = 1 to 65536), ±3.5 ppm INL, and seamless daisy-chain capability for multi-channel synchronized sampling.

Technical Context

The DC2289A-A implements the LTC2380-24 in its 16-lead DFN (4 mm × 3 mm) package with exposed pad grounded, using a dual-supply configuration: 2.5 V for VDD (analog core) and 3.3 V for OVDD (digital I/O). It integrates a low-drift 5 V reference (LT6657), matched RC anti-aliasing filters on both IN+ and IN–, and robust decoupling (47 µF X7R + 0.1 µF ceramic per supply).

Signal routing follows strict differential pair layout rules with controlled impedance traces, ground plane isolation between analog and digital sections, and dedicated REF and GND return paths. The board supports all LTC2380-24 operating modes - including REF/DGC pin selection for digital gain compression and CHAIN pin control for daisy-chain configuration - via onboard jumpers and test points.

Key Specifications

Availability

DC2289A-A is available at Aetrix Electronics and suitable for high-precision data acquisition, seismic sensor interfacing, and medical imaging system development requiring stable component supply and traceable evaluation hardware.

Supply support for DC2289A-A 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, serving precision instrumentation, industrial, and medical markets.

The DC2289A-A belongs to ADI's Linear Technology Evaluation Board product line, designed specifically to accelerate prototyping and characterization of high-resolution ADCs like the LTC2380-24 in demanding measurement applications.

FAQ

What is the primary function of the DC2289A-A evaluation board?

The DC2289A-A evaluation board is a ready-to-use platform for evaluating the LTC2380-24 24-bit, 2 Msps SAR ADC. It provides all necessary power regulation, reference, analog conditioning, and SPI interface circuitry so engineers can immediately measure dynamic performance - including SNR, THD, INL, and real-time digital averaging behavior - without custom PCB design. DC2289A-A enables direct connection to FPGA or microcontroller hosts via standard 0.1"-spaced headers.

Does the DC2289A-A support daisy-chaining multiple LTC2380-24 devices?

Yes, the DC2289A-A fully supports daisy-chain operation of the LTC2380-24. The CHAIN pin is brought out to a jumper-selectable header, and RDL/SDI and SDO signals are routed to stacking headers compatible with multi-board synchronization. When CHAIN is high, the board accepts serial data from a preceding device on RDL/SDI and forwards its own result on SDO - enabling time-aligned sampling across up to 16 ADCs. This functionality is validated on DC2289A-A using the LTC2380-24's native timing specifications.

What reference voltage does the DC2289A-A use, and is it user-adjustable?

The DC2289A-A uses the LT6657-5 low-drift, low-noise 5 V reference IC, delivering ±0.05% initial accuracy and 5 ppm/°C max drift - optimized for the LTC2380-24's ±3.5 ppm INL spec. While the default is fixed 5 V, the board includes solder-jumper options (JP1, JP2) to disconnect the LT6657 and route an external reference to the REF and REF/DGC pins, supporting user-defined VREF from 2.5 V to 5.1 V as specified in the LTC2380-24 datasheet.

How is analog input drive handled on the DC2289A-A to preserve 24-bit linearity?

The DC2289A-A employs a fully differential, matched passive RC anti-aliasing network (10 Ω + 6800 pF per leg) directly at the LTC2380-24 IN+ and IN– pins, followed by Kelvin-connected SMA inputs. This design minimizes charge injection, ensures symmetrical settling, and maintains CMRR > 86 dB up to 1 MHz. The board also includes test points for probing pre-filter and post-filter signals, allowing users to validate driver amplifier performance and verify that transition noise remains ≤ 0.55 LSB RMS (N = 16384) as measured on DC2289A-A.

Can the DC2289A-A operate with different OVDD logic voltages (e.g., 1.8 V or 5 V)?

Yes, the DC2289A-A supports OVDD from 1.8 V to 5 V via the onboard LDO configuration. By default, it ships with a 3.3 V LDO (LT3045), but the U3 regulator can be replaced with pin-compatible variants (e.g., LT3042 for 1.8 V or LT3071 for 5 V) to match host controller I/O voltage. All digital signals - SCK, SDO, RDL/SDI, CNV, BUSY - are level-shifted accordingly, preserving timing margins (tSCK ≥ 10 ns) and ensuring reliable SPI communication across the full LTC2380-24 specification range.