CHT3029-99F DC-35GHz 4-Bit Digital Attenuator | UMS High-Performance MMIC
CHT3029-99F: The Ultimate Wideband 4-Bit Digital Attenuator (DC-35GHz)
In the demanding world of microwave and RF communications, precision and bandwidth are paramount. United Monolithic Semiconductors (UMS) introduces the CHT3029-99F, a state-of-the-art 4-bit digital attenuator designed to deliver exceptional performance across a massive frequency range from DC to 35GHz.
What is the CHT3029-99F?
The CHT3029-99F is a very wideband digital attenuator provided in chip form. It integrates a 4-bit control interface allowing for precise signal control. It is manufactured using a robust pHEMT process with a 0.25µm gate length, featuring air bridges and electron beam gate lithography to ensure top-tier reliability and performance.
Key Features and Benefits
Engineers looking for a DC-35GHz attenuator will find the CHT3029-99F optimized for both performance and ease of integration.
Ultra-Wide Bandwidth: Operates seamlessly from DC to 35GHz, covering a vast spectrum of RF applications.
High Dynamic Range: Provides a dynamic range of 15dB.
Precise Step Resolution: Features a Least Significant Bit (LSB) of 1dB, allowing for fine-tuned signal attenuation.
Low Insertion Loss: Typical insertion loss (state 0) is just 4.5dB, minimizing signal degradation.
Exceptional Accuracy: Boasts a low RMS attenuation error of 0.2dB, ensuring consistent performance across all states.
Compact Footprint: The chip size is small, measuring 2.61 x 1.56 mm², making it ideal for miniaturized electronic warfare or telecom systems.
Technical Specifications
Below is a summary of the main electrical characteristics at Tamb = +25°C:
| Parameter | Value | Unit |
| Frequency Range | DC - 35 | GHz |
| Insertion Loss (Typ) | 4.5 | dB |
| Dynamic Range | 15 | dB |
| Return Losses (Input) | 12 (min) | dB |
| Step Size (LSB) | 1 | dB |
| Bias Voltage (V+) | 5 | V |
| Bias Voltage (V-) | -5 | V |
| Switching Time | 15 (typ) | ns |
Target Applications
The CHT3029-99F is engineered for versatility. Its wide frequency coverage and digital control make it a preferred component for:
Commercial Communication Systems: High-frequency data links and telecommunications infrastructure.
Military Systems: Radar, electronic warfare, and secure communication devices requiring robust GaAs technology.
Test and Measurement Equipment: Due to its broad bandwidth (DC-35GHz) and high linearity.
Integration and Handling
The CHT3029-99F is designed for standard chip-and-wire assembly. It requires a DC bias of +5V and -5V.
Control Interface: The device uses 4 control pads (A1 to A4) for digital state selection, with control voltages compatible with standard logic levels (0/+3.3V or +5V).
Assembly: It features no internal DC block at the input/output RF accesses, so external DC blocking is required for decoupling. Bonding wires should be kept short (typically < 0.2nH inductance) for optimal RF performance.
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