Analog Devices Inc. DC1233A-A

Overview

DC1233A-A from Analog Devices (formerly Linear Technology) is a high-linearity, single-ended upconverting mixer IC optimized for RF transmitter signal chains in 1.5GHz–3.8GHz applications. It delivers +27.3dBm OIP3 at 2.14GHz, –158dBm/Hz noise floor at –5dBm RF output, and 2.6dB conversion gain with only –1dBm LO drive on a single 3.3V supply. It serves as the core frequency translation element in W-CDMA/LTE base station transmitters.

For engineers reviewing the DC1233A-A datasheet, DC1233A-A pinout, DC1233A-A application, or DC1233A-A equivalent, this page provides verified technical context, package mapping, real-world performance trade-offs across IF/RF/LO bands, and validated alternatives for 2G–5G infrastructure and WiMAX transmitter designs.

Technical Context

The DC1233A-A implements a double-balanced active mixer core driven by an integrated LO buffer amplifier and internal baluns, enabling single-ended LO input and RF output while maintaining differential IF interface. Its architecture minimizes LO leakage to –35dBm and supports both high-side and low-side LO injection depending on RF/IF frequency pairing.

It operates with internally regulated 570mV common-mode voltage on IF+ and IF– pins, requires external 11Ω precision resistors and 40nH inductors for optimal IF biasing, and relies on the exposed thermal pad (Pin 25) for RF grounding and thermal dissipation-critical for stable high-frequency linearity.

Key Specifications

Pinout & Package

DC1233A-A is housed in a 5mm × 5mm plastic QFN-24 package with exposed thermal pad (Pin 25). The package requires soldering of the exposed pad to a low-impedance RF ground plane for thermal management and optimal RF performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar upconverting mixer applications.

Compared with DC1233A-A, HMC669LC4 trades higher LO power demand for greater linearity headroom, while ADL5802ACPZ-R7 sacrifices 3.5GHz capability for superior noise figure and broader IF bandwidth-making DC1233A-A the balanced choice for full 1.5–3.8GHz infrastructure transmitters.

Availability

DC1233A-A is available at Aetrix Electronics and suitable for W-CDMA/LTE/WiMAX basestation development, industrial wireless gateways, and 5G FR1 radio unit prototyping requiring stable component supply and long-term lifecycle assurance.

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

The DC1233A-A belongs to ADI's high-linearity RF mixer product line, designed specifically for broadband wireless infrastructure transmitters demanding low LO drive, high OIP3, and thermal stability in compact form factors.

FAQ

What is the recommended LO drive level for optimal linearity in DC1233A-A?

The DC1233A-A achieves peak OIP3 performance at –1dBm LO input power across its operational band. Deviating below –3dBm reduces conversion gain and increases noise figure; exceeding +2dBm risks compression and degrades LO-to-RF leakage. For 2.14GHz operation, –1dBm yields +27.3dBm OIP3 and 2.6dB gain per the DC1233A-A datasheet.

Can DC1233A-A operate with IF frequencies below 100MHz?

Yes, DC1233A-A supports IF inputs from DC to 1GHz. At 70MHz, it delivers +29dBm OIP3 and 1.8dB gain with appropriate external matching (e.g., 4.7nH chokes and 120pF capacitor), as validated in the 1650MHz application circuit. Performance remains stable down to DC due to its differential emitter-coupled IF interface.

How should the exposed thermal pad (Pin 25) of DC1233A-A be connected on the PCB?

The exposed pad of DC1233A-A must be soldered to a solid copper area on the top layer, connected via ≥6 thermal vias (0.3mm diameter, filled or capped) to inner ground planes. This connection serves dual purposes: RF grounding to suppress common-mode currents and thermal dissipation to maintain junction temperature below 150°C under 226mA load at 85°C ambient.

Does DC1233A-A support both high-side and low-side LO injection?

Yes, DC1233A-A supports both configurations. For 2140MHz RF output with 240MHz IF, high-side LO at 2380MHz is used; for 1750MHz RF, low-side LO at 1510MHz is applied. The datasheet specifies distinct OIP3/gain/noise figures for each mode-e.g., +27.3dBm OIP3 at 2140MHz uses high-side LO, while +29dBm at 1750MHz uses low-side LO.

What is the maximum RF output power before compression in DC1233A-A?

The DC1233A-A exhibits 1dB compression at +13.9dBm RF output power when configured for 2140MHz operation with 240MHz IF and –1dBm LO drive. At 3600MHz, P1dB drops to +10.7dBm due to reduced gain and increased losses, as confirmed in the AC Electrical Characteristics table of the DC1233A-A datasheet.