Analog Devices Inc. DC2078A

Overview

DC2078A from Analog Devices (formerly Linear Technology) is a fully populated, ready-to-use evaluation board for the LTC6430-20 20 dB differential RF/IF amplifier. It enables rapid characterization of high-linearity performance-including 51.0 dBm OIP3 at 240 MHz, 20.8 dB gain, and 2.9 dB noise figure-into 100 Ω differential loads across 20 MHz to 2060 MHz. Designed for ADC driver, CATV, and LTE IF signal chain validation.

For engineers reviewing the DC2078A datasheet, DC2078A pinout, DC2078A application, or DC2078A equivalent, this page delivers verified layout details, balun-based 50 Ω test interface support, thermal management guidance for the exposed-pad QFN, supply decoupling recommendations, and measured S-parameter behavior up to 2.5 GHz-all specific to the DC2078A evaluation platform.

Technical Context

The DC2078A implements Test Circuit A from the LTC6430-20 datasheet, using Mini-Circuits ADT2-IT/ADT2-1P/ADTL2-18 1:2 baluns to convert between 50 Ω single-ended test equipment and the LTC6430-20's native 100 Ω differential I/O. It supports both 50 Ω balanced IF and 75 Ω CATV configurations via selectable component placement.

Board-level design incorporates dual 560 nH RF chokes (L1/L2), 1000 pF + 0.1 µF VCC decoupling per supply pin, 1000 pF DC-blocking capacitors, and a 60 pF/350 Ω low-frequency stability network on the input. The LTC6430-20 UFD package (4 mm × 4 mm, 24-lead QFN with exposed pad) is soldered with optimized thermal vias to internal ground planes.

Key Specifications

Availability

DC2078A is available at Aetrix Electronics and suitable for RF front-end validation, high-speed ADC driver qualification, broadband IF signal chain prototyping, and LTE/5G infrastructure development requiring stable component supply and traceable evaluation hardware.

Supply support for DC2078A 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 communications, industrial, automotive, and instrumentation markets.

The DC2078A belongs to ADI's Linear Technology Evaluation Board family, engineered to accelerate time-to-test for precision RF amplifiers and ensure repeatable, production-relevant characterization of linearity, noise, and bandwidth under real-world PCB conditions.

FAQ

What is the primary function of the DC2078A evaluation board?

The DC2078A evaluation board is a dedicated platform for evaluating the LTC6430-20 differential RF amplifier. It provides full access to all pins, implements the recommended Test Circuit A layout-including 1:2 baluns, RF chokes, and decoupling networks-and enables accurate measurement of key AC parameters such as OIP3, P1dB, S-parameters, and noise figure using standard 50 Ω test equipment. The DC2078A does not contain additional logic or microcontrollers-it is strictly an analog RF evaluation tool.

Does the DC2078A support both 50 Ω and 75 Ω system interfaces?

Yes-the DC2078A supports both configurations. Its default layout uses Mini-Circuits 1:2 baluns to match the LTC6430-20's 100 Ω differential I/O to 50 Ω test equipment. For 75 Ω CATV applications, the board allows substitution of 1:1.33 baluns (e.g., Mini-Circuits TCM1-75+), and the schematic provides footprints and routing guidance for that variant. Performance data for the 75 Ω mode is documented in the LTC6430-20 datasheet at 40–1000 MHz.

How is thermal management implemented on the DC2078A for the LTC6430-20?

The DC2078A implements thermal management by soldering the LTC6430-20's exposed pad (Pin 25) directly to a solid copper area tied to internal ground planes via ≥8 thermal vias (0.3 mm diameter). This structure achieves low junction-to-board thermal resistance (θ_JB ≈ 12 °C/W), enabling stable operation at full 850 mW power dissipation across –40°C to +85°C ambient. The board documentation specifies minimum solder paste stencil aperture and reflow profile requirements to ensure void-free pad attachment.

Can the DC2078A be used to evaluate single-ended operation of the LTC6430-20?

No-the DC2078A is designed exclusively for differential operation. The LTC6430-20 itself is a fully differential amplifier with matched +IN/–IN and +OUT/–OUT pairs; it lacks internal circuitry for true single-ended use. While the DC2078A's baluns permit single-ended stimulus and response, the device under test remains operating differentially. For single-ended gain blocks, Analog Devices recommends the pin-compatible LTC6431-20 and its corresponding evaluation board (DC2079A).

What are the critical external components required to operate the DC2078A beyond the board itself?

To operate the DC2078A, users require only a 5 V/500 mA DC power supply, two 50 Ω RF cables with SMA connectors, and optionally a spectrum analyzer or vector network analyzer. No additional passive components are needed-the board integrates all required DC-blocking capacitors (1000 pF), RF chokes (560 nH), decoupling networks (1000 pF + 0.1 µF), and stability compensation (60 pF + 350 Ω). Baluns are pre-mounted; no user assembly is required for baseline operation.