Analog Devices Inc. DC1783A-G

Overview

DC1783A-G from Analog Devices (formerly Linear Technology) is a fully assembled, tested demonstration board for the LTC2377-18 - an 18-bit, 500ksps low-power SAR ADC with 102dB SNR, ±1.75LSB INL, and digital gain compression (DGC). It features a precision single-ended-to-differential signal chain using the LT6350 driver, configurable reference (2.5V–5.1V), and SPI interface supporting daisy-chain mode. Designed for high-speed data acquisition evaluation in medical imaging and portable instrumentation.

For engineers reviewing the DC1783A-G datasheet, DC1783A-G pinout, DC1783A-G application, or DC1783A-G equivalent, this page delivers verified hardware configuration details, measured performance data (e.g., 102.3dB SNR at 2kHz), DGC-enabled input range validation (0.5V–4.5V with 5V REF), and direct integration guidance with host microcontrollers via 1.8V–5V I/O-compatible SPI.

Technical Context

The DC1783A-G implements the LTC2377-18 in its 16-lead DFN package (4mm × 3mm) with exposed pad grounded, paired with the LT6350 single-ended-to-differential amplifier configured for 0V–5V input conversion. It supports all LTC2377-18 operating modes: normal SPI, daisy-chain, and DGC-enabled operation via REF/DGC pin control.

Board-level design includes optimized decoupling (10µF + 0.1µF on VDD/OVDD; 47µF X5R on REF), matched RC filtering (20Ω/3300pF LPF1 + 20Ω/6800pF LPF2), and precise common-mode biasing (VCM = VREF/2). All timing-critical signals - CNV, SCK, BUSY - are routed with controlled impedance and minimal stub length to preserve 500ksps sampling integrity and aperture jitter ≤4ps.

Key Specifications

Availability

DC1783A-G is available at Aetrix Electronics and suitable for medical imaging systems, portable instrumentation, industrial process control, and high-speed data acquisition requiring stable component supply and validated reference design fidelity.

Supply support for DC1783A-G 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 precision measurement, industrial, communications, and healthcare markets.

The DC1783A-G belongs to ADI's Linear Technology legacy evaluation board portfolio, specifically designed to accelerate prototyping and performance validation of high-resolution SAR ADCs in demanding signal chain applications.

FAQ

What is the primary function of the DC1783A-G evaluation board?

The DC1783A-G is a ready-to-use demonstration platform for the LTC2377-18 18-bit SAR ADC. It integrates the LTC2377-18 in DFN packaging, the LT6350 single-ended-to-differential driver, precision filtering, and configurable reference circuitry - enabling immediate evaluation of dynamic performance (e.g., 102.3dB SNR), DGC functionality, and SPI interface behavior without custom PCB development. The DC1783A-G validates real-world signal chain fidelity under defined test conditions.

Does the DC1783A-G support digital gain compression (DGC) mode for the LTC2377-18?

Yes, the DC1783A-G fully supports DGC mode. The REF/DGC pin is accessible via jumper JP1: grounding it enables DGC, compressing the effective input range to 10%–90% of ±VREF (e.g., 0.5V–4.5V with 5V REF). This allows the LT6350 driver to operate from a single 5.5V supply while preserving full 18-bit resolution - a key feature validated on the DC1783A-G per the LTC2377-18 datasheet.

What input configurations does the DC1783A-G support out-of-the-box?

The DC1783A-G is pre-configured for 0V–5V single-ended input conversion using the LT6350, producing a ±5V differential output into the LTC2377-18. It also supports true bipolar inputs (e.g., ±10V) via resistor network reconfiguration per Figure 6a in the LTC2377-18 datasheet. Input filtering (LPF1/LPF2) and common-mode biasing (VCM = VREF/2) are fixed and optimized for <100ppm THD and >102dB SNR performance on the DC1783A-G.

Can the DC1783A-G be used with microcontrollers operating at 1.8V logic levels?

Yes, the DC1783A-G supports 1.8V I/O logic. The OVDD supply for the LTC2377-18's digital interface is brought out to header P3 and can be set to 1.8V, 2.5V, 3.3V, or 5V. All SPI signals (SCK, SDO, RDL/SDI, CNV, BUSY) comply with 1.8V logic thresholds (VIH ≥ 0.8×OVDD, VIL ≤ 0.2×OVDD), ensuring reliable communication with low-voltage MCUs when OVDD = 1.8V on the DC1783A-G.

Is the DC1783A-G compatible with daisy-chain configurations of multiple LTC2377-18 devices?

Yes, the DC1783A-G implements full daisy-chain capability. The CHAIN pin is accessible via jumper JP2, and the RDL/SDI pin functions as SDI in chain mode. The board's SPI routing and termination support multi-device cascading, with SDO of one DC1783A-G connecting directly to RDL/SDI of the next. Timing parameters (e.g., tSCKCH = 13.5ns min) are preserved per LTC2377-18 specifications on the DC1783A-G layout.