Analog Devices Inc. DC1444A-B

Overview

DC1444A-B from Analog Devices (formerly Linear Technology) is a demonstration board for the LTC2305 2-channel, 12-bit I²C-compatible SAR ADC. It provides complete signal conditioning, reference decoupling, and I²C interface circuitry to evaluate unipolar/bipolar differential or single-ended analog input operation with 73.5dB SNR, 1.3μs conversion time, and 14ksps throughput. Designed for rapid validation in battery-powered data acquisition systems.

For engineers reviewing the DC1444A-B datasheet, DC1444A-B pinout, DC1444A-B application, or DC1444A-B equivalent, this board enables immediate functional verification of LTC2305-based designs-including channel switching, sleep mode control, I²C address configuration (AD0/AD1), and REFCOMP/VREF bypassing-without custom PCB development.

Technical Context

The DC1444A-B implements the full LTC2305 evaluation architecture: dual analog input paths with selectable CH0/CH1 routing, precision 4.096V REFCOMP buffer output with 10μF + 0.1μF decoupling, internal 2.5V VREF with 2.2μF ceramic bypass, and robust I²C interface with pull-up resistors on SDA/SCL. All GND pins connect to a unified ground plane, and the exposed pad (Pin 13) is soldered to thermal ground.

It supports all LTC2305 operating modes via onboard jumpers and DIP switches: unipolar/bipolar selection, differential/single-ended configuration, and nap/sleep mode activation. The board includes test points for CH0, CH1, VREF, REFCOMP, SDA, SCL, AD0, AD1, and power rails-enabling direct oscilloscope probing of timing waveforms, reference settling (tREFWAKE = 200ms), and acquisition dynamics (tACQ = 240ns).

Key Specifications

Availability

DC1444A-B is available at Aetrix Electronics and suitable for industrial process control, motor control feedback loops, and isolated remote data acquisition requiring stable component supply and rapid prototyping capability.

Supply support for DC1444A-B 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, acquired Linear Technology in 2017.

The DC1444A-B belongs to ADI's Linear Technology Demonstration Board family, engineered specifically to accelerate design-in of precision data converters like the LTC2305 in space-constrained, low-power applications.

FAQ

What is the primary function of the DC1444A-B evaluation board?

The DC1444A-B evaluation board is a fully assembled and tested platform for evaluating the LTC2305 2-channel, 12-bit I²C ADC. It provides all necessary support circuitry-including precision reference decoupling, configurable analog inputs, and I²C interface components-to validate performance metrics such as SNR (73.5dB), INL (±1 LSB), and conversion timing (1.3μs) under real-world conditions. DC1444A-B eliminates the need for custom layout during early-stage design.

Does the DC1444A-B support both unipolar and bipolar input ranges for the LTC2305?

Yes, the DC1444A-B supports software-selectable unipolar (0V to 4.096V) and bipolar (±2.048V) input ranges via the LTC2305's UNI bit in the 6-bit DIN configuration word. Jumper settings and onboard test points allow direct verification of range switching behavior, reference settling (tREFWAKE = 200ms), and zero/full-scale error drift (±0.5 LSB unipolar zero error, ±1 LSB bipolar full-scale error) across temperature.

How does the DC1444A-B handle I²C address configuration for the LTC2305?

The DC1444A-B exposes the LTC2305's AD0 and AD1 address pins via 0.1"-spaced headers, enabling hardware-level I²C address selection per Table 2 in the LTC2305 datasheet. With three-state logic (LOW/HIGH/floating), these pins configure one of nine possible slave addresses plus a global synchronization address. DC1444A-B includes pull-down/pull-up options and test points to verify address recognition and bus arbitration in multi-device systems.

Can the DC1444A-B be used to measure channel-to-channel isolation and crosstalk of the LTC2305?

Yes, the DC1444A-B's independently routed CH0 and CH1 analog paths-with dedicated input connectors, guard traces, and separate ground return paths-enable accurate measurement of LTC2305 channel-to-channel isolation (–109 dB at 1kHz). Test points at each channel input and output allow simultaneous oscilloscope probing to quantify crosstalk under dynamic full-scale step conditions and verify multiplexer switching integrity.

What thermal management features does the DC1444A-B implement for the LTC2305 in DFN package?

The DC1444A-B uses the LTC2305's exposed pad (Pin 13) as a thermal interface, soldering it directly to a large internal ground plane with multiple thermal vias. This achieves θJA = 43°C/W (per DFN package spec), supporting continuous operation at 85°C ambient. The board layout isolates analog and digital grounds while maintaining low-impedance return paths-critical for preserving the LTC2305's 73.5dB SNR and minimizing thermal-induced offset drift (0.002 LSB/°C).