Overview
The HMC939 is a broadband 5-bit GaAs IC digital attenuator MMIC chip produced by Analog Devices Inc. This component operates across a wide frequency range of 0.1 to 40 GHz, making it highly versatile for various high-frequency applications. The attenuator features 1.0 dB least significant bit (LSB) steps, allowing for a total attenuation range of 31 dB. It is designed with a single positive control line per bit, ensuring easy and precise control over the attenuation states.
Key Specifications
| Parameter | Frequency Range | Min. | Typ. | Max. | Units |
|---|---|---|---|---|---|
| Insertion Loss | 0.1 - 18.0 GHz | - | 4.0 | 5.5 | dB |
| Insertion Loss | 18.0 - 26.5 GHz | - | 5.5 | 7.0 | dB |
| Insertion Loss | 26.5 - 33.0 GHz | - | 6.5 | 8.5 | dB |
| Attenuation Range | 0.1 - 33.0 GHz | - | - | 31 | dB |
| Return Loss (RF1 & RF2, All Atten. States) | 0.1 - 33.0 GHz | - | - | 12 | dB |
| Input Third Order Intercept Point (Two-Tone Input Power= 0 dBm Each Tone) | 0.1 - 0.5 GHz | - | 40 | - | dBm |
| Input Third Order Intercept Point (Two-Tone Input Power= 0 dBm Each Tone) | 0.5 - 33.0 GHz | - | 43 | - | dBm |
| Switching Characteristics tRISE, tFALL (10/90% RF) | 0.1 - 33.0 GHz | - | 60 | 90 | ns |
| Switching Characteristics tON/tOFF (50% CTL to 10/90% RF) | 0.1 - 33.0 GHz | - | 60 | 90 | ns |
| Idd | 0.1 - 33.0 GHz | 2.5 | 4.5 | 6.5 | mA |
| Iss | 0.1 - 33.0 GHz | -7.0 | -5.0 | -3.0 | mA |
| Operating Temperature | - | -40 | - | 85 | °C |
Key Features
- 5-bit digital attenuator with 1.0 dB LSB steps up to 31 dB total attenuation.
- Operates across a broad frequency range of 0.1 to 40 GHz.
- High input IP3 of +43 dBm.
- Single positive control line per bit for easy control.
- Low insertion loss, typically less than 5 dB.
- Excellent attenuation accuracy with ±0.4 dB typical step error.
- Available in die form and low-cost leadless surface mount packages (e.g., HMC939LP4 and HMC939LP4E).
Applications
- Fiber Optics and Broadband Telecom.
- Microwave Radio and VSAT (Very Small Aperture Terminal) systems.
- Military Radios, Radar, and Electronic Countermeasures (ECM).
- Space Applications.
- Sensors and Test & Measurement Equipment.
Q & A
- What is the frequency range of the HMC939 attenuator?
The HMC939 operates across a frequency range of 0.1 to 40 GHz.
- What is the attenuation step size and total attenuation range of the HMC939?
The HMC939 has 1.0 dB least significant bit (LSB) steps, providing a total attenuation range of 31 dB.
- What is the typical insertion loss of the HMC939?
The typical insertion loss is less than 5 dB.
- What is the input IP3 of the HMC939?
The input IP3 is +43 dBm.
- How is the attenuation controlled in the HMC939?
The attenuation is controlled by a single positive control line per bit.
- What are the typical switching times for the HMC939?
The typical rise and fall times (tRISE, tFALL) are 60-90 ns, and the typical on/off times (tON/tOFF) are also 60-90 ns.
- What are the current consumption specifications for the HMC939?
The current consumption (Idd) ranges from 2.5 to 6.5 mA, and the current sink (Iss) ranges from -7.0 to -3.0 mA.
- What are the operating temperature limits for the HMC939?
The operating temperature range is from -40°C to +85°C.
- In what types of packages is the HMC939 available?
The HMC939 is available in die form and in low-cost leadless surface mount packages (e.g., HMC939LP4 and HMC939LP4E).
- What are some typical applications for the HMC939?
Typical applications include Fiber Optics, Broadband Telecom, Microwave Radio, VSAT, Military Radios, Radar, ECM, Space Applications, Sensors, and Test & Measurement Equipment.
