Overview
The HMC908ALC5TR from Analog Devices Inc. is a compact, gallium arsenide (GaAs) monolithic microwave integrated circuit (MMIC) designed as an in-phase/quadrature (I/Q) downconverter. It is packaged in a leadless, RoHS compliant ceramic leadless chip carrier (LCC-32). This device is optimized for point-to-point and point-to-multipoint microwave radio applications, operating within the 9 GHz to 12 GHz input RF frequency range. The HMC908ALC5TR integrates a low noise amplifier (LNA) followed by an image rejection mixer, which is driven by a local oscillator (LO) buffer amplifier. This configuration eliminates the need for a filter following the LNA and reduces thermal noise at the image frequency.
Key Specifications
| Parameter | Min. | Typ. | Max. | Units |
|---|---|---|---|---|
| Frequency Range, RF | 9 | 12 | GHz | |
| Frequency Range, LO | 5.5 | 15.5 | GHz | |
| Frequency Range, IF | DC | 3.5 | GHz | |
| Conversion Gain (As IRM) | 8 | 11 | dB | |
| Noise Figure | 2.2 | dB | ||
| Image Rejection | 15 | 25 | dB | |
| 1 dB Compression (Input) | -5 | dBm | ||
| LO to RF Isolation | 40 | 50 | dB | |
| LO to IF Isolation | 5 | 10 | dB | |
| IP3 (Input) | -3 | 2 | dBm | |
| Supply Current (ID1 + ID2) | 60 | 88 | mA | |
| Supply Current (ID3) | 100 | 120 | mA |
Key Features
- Compact GaAs MMIC I/Q downconverter in a leadless, RoHS compliant ceramic leadless chip carrier (LCC-32).
- Small signal conversion gain of 11 dB and a noise figure of 2.2 dB.
- Image rejection of 25 dB, reducing the need for additional filtering.
- Utilizes an LNA followed by an I/Q double balanced mixer, driven by an LO buffer amplifier.
- Requires an external 90° hybrid to select the desired sideband.
- Supports LO input frequencies from 5.5 GHz to 15.5 GHz and IF output frequencies from DC to 3.5 GHz.
- Self-biased LNA and LO driver amplifier, simplifying biasing requirements.
Applications
- Point-to-Point and Point-to-Multi-Point Radio Systems.
- Military Radar, Electronic Warfare (EW), and Electronic Intelligence (ELINT).
- Satellite Communications.
- Maritime and Mobile Radio Systems.
Q & A
- What is the frequency range of the RF input for the HMC908ALC5TR?
The RF input frequency range is from 9 GHz to 12 GHz.
- What is the typical conversion gain of the HMC908ALC5TR?
The typical conversion gain is 11 dB.
- What is the noise figure of the HMC908ALC5TR?
The noise figure is 2.2 dB.
- How much image rejection does the HMC908ALC5TR provide?
The device provides 25 dB of image rejection.
- What type of mixer is used in the HMC908ALC5TR?
The mixer is an I/Q double balanced mixer.
- Is an external component required to select the sideband?
- What are the typical supply currents for the LNA and LO driver amplifier?
The LNA typically draws 53 mA at 3 V, and the LO driver amplifier typically draws 100 mA at 5 V.
- What is the LO to RF isolation of the HMC908ALC5TR?
The LO to RF isolation is typically 50 dB.
- In what types of applications is the HMC908ALC5TR commonly used?
- Is the HMC908ALC5TR RoHS compliant?
