Analog Devices Inc. DC1233A-C

Overview

DC1233A-C from Analog Devices (formerly Linear Technology) is a demonstration circuit designed to evaluate the LT5579 high-linearity upconverting mixer IC for UMTS applications, featuring 240MHz IF input, high-side LO injection, and 2.14GHz RF output with 2.6dB conversion gain, 27.3dBm OIP3, and 9.9dB single-sideband noise figure.

For engineers reviewing the DC1233A-C datasheet, DC1233A-C pinout, DC1233A-C application, or DC1233A-C equivalent, this board enables rapid validation of RF upconversion performance in 3G cellular infrastructure, base station transceivers, and broadband wireless systems requiring stable gain flatness, low LO leakage, and high output linearity at 2.14GHz.

Technical Context

DC1233A-C implements the LT5579 mixer in a fully populated, impedance-matched layout optimized for UMTS band operation. It uses differential IF input matching with 240MHz center frequency, high-side LO configuration, and transformer-coupled RF output tuned for 2035–2285MHz operation with 10dB return loss.

The board integrates precision microwave components-including AVX Accu-P series capacitors and matched 0.1% resistors-to minimize LO-to-RF leakage (–35dBm), maximize IF-to-LO isolation (81dB), and maintain thermal stability across –40°C to +85°C with –0.020dB/°C conversion gain drift.

Key Specifications

Availability

DC1233A-C is available at Aetrix Electronics and suitable for UMTS base station transceivers, 3G small cell radios, and RF test instrumentation requiring stable component supply, repeatable RF performance, and validated high-side LO upconversion architecture.

Supply support for DC1233A-C 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 RF semiconductor solutions, serving communications, industrial, automotive, and aerospace markets with precision signal processing technologies.

DC1233A-C belongs to ADI's Linear Technology demonstration circuit portfolio, engineered specifically to accelerate RF system development using high-linearity active mixers like the LT5579 in cellular infrastructure and wireless test equipment.

FAQ

What is the primary function of the DC1233A-C demonstration circuit?

The DC1233A-C demonstration circuit provides a fully assembled and tested platform for evaluating the LT5579 upconverting mixer IC in UMTS applications. It delivers verified RF performance including 2.6dB conversion gain, 27.3dBm OIP3, and 9.9dB noise figure at 2.14GHz output with high-side LO injection. DC1233A-C simplifies design-in by eliminating RF matching uncertainty and enabling immediate measurement of key mixer metrics.

Which IF and RF frequency bands does DC1233A-C support?

DC1233A-C is configured for 240MHz IF input and 2.14GHz RF output using high-side LO injection (f_LO = 2.38GHz). Its RF output port maintains ≥10dB return loss from 2035MHz to 2285MHz, covering UMTS Band I uplink (1920–1980MHz) and adjacent guard bands. The IF input network supports 174–263MHz with ≥12dB return loss when LO is applied.

Does DC1233A-C require external power regulation or biasing?

No. DC1233A-C operates from a single 3.3V DC supply and draws 226mA under typical test conditions (P_IF = –5dBm, P_LO = –1dBm). On-board decoupling and precision current-setting resistors (R1/R2) establish optimal 50mA per side DC bias for the LT5579 core. No external regulators, level shifters, or bias tees are required for basic operation.

How is LO-to-RF leakage managed on DC1233A-C?

DC1233A-C achieves –35dBm LO-to-RF leakage through balanced LT5579 core design, internal RF transformer coupling, and optimized microstrip layout. Component selection-including high-Q inductors L1/L2 and matched 0.1% R1/R2-minimizes common-mode imbalance. Measured LO leakage remains stable across temperature (–40°C to +85°C) and meets UMTS spectral mask requirements without additional filtering.

Can DC1233A-C be reconfigured for other IF frequencies?

Yes. DC1233A-C can be modified for alternate IF frequencies by replacing C1, C2, C9, C3, TL1/TL2, L1/L2, and R1/R2 per Table 2 in the Quick Start Guide. Matching networks for 70MHz, 140MHz, 240MHz, and 450MHz IF are documented. Reconfiguration requires PCB rework and verification of IF input return loss and conversion performance at the new frequency.