Overview
The HMC980LP4E is an active bias controller produced by Analog Devices Inc. This component is designed to automatically adjust the gate voltage of an external amplifier to achieve a constant drain current. It integrates a controller that ensures safe power-up, power-down, and disable/enable sequences for the external amplifier, thereby ensuring the safe operation of the amplifier. The HMC980LP4E supports both enhancement and depletion mode Class A amplifiers with drain voltages ranging from 5 V to 16.5 V and drain currents up to 1.6 A, providing a comprehensive biasing solution.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 5 V to 16.5 V |
| Drain Current | Up to 1.6 A |
| Package Type | 24-lead LFCSP (4 mm x 4 mm with exposed backside pad) |
| Operating Temperature | Not specified in the provided sources, but typically follows standard industrial temperature ranges |
| Gate Current Capability | Sink or source up to ±4 mA |
| Negative Voltage Generator | Optional internal negative voltage generation |
| Power-Up/Power-Down Sequencing | Automatic sequencing to ensure safe amplifier operation |
| Overcurrent/Undercurrent Alarm | Built-in alarm feature with hysteresis |
Key Features
- Automatic gate voltage adjustment without calibration
- Support for enhancement and depletion mode Class A amplifiers
- Adjustable drain current up to 1.6 A
- Sink or source gate current up to ±4 mA
- Optional internal negative voltage generation
- Fast enable/disable and power-up/power-down sequencing
- TRIGOUT output for daisy chaining
- Overcurrent/undercurrent alarm with hysteresis
- Secondary gate voltage (VG2) generation
Applications
- Microwave radio and very small aperture terminals (VSATs)
- Military and space applications
- Test instrumentation
- Fiber optic modulator driver biasing
- CATV laser driver biasing
- Cellular base stations
- Wireless infrastructure equipment
Q & A
- What is the primary function of the HMC980LP4E? The HMC980LP4E is an active bias controller that automatically adjusts the gate voltage of an external amplifier to maintain a constant drain current.
- What types of amplifiers does the HMC980LP4E support? The HMC980LP4E supports both enhancement and depletion mode Class A amplifiers.
- What is the range of supply voltage for the HMC980LP4E? The supply voltage range is from 5 V to 16.5 V.
- What is the maximum drain current the HMC980LP4E can handle? The maximum drain current is up to 1.6 A.
- Does the HMC980LP4E have an internal negative voltage generator? Yes, the HMC980LP4E has an optional internal negative voltage generator.
- What is the purpose of the TRIGOUT output? The TRIGOUT output is used for daisy chaining.
- Does the HMC980LP4E have overcurrent/undercurrent protection? Yes, it has a built-in overcurrent/undercurrent alarm feature with hysteresis.
- What is the package type of the HMC980LP4E? The HMC980LP4E is housed in a 24-lead LFCSP (4 mm x 4 mm with exposed backside pad) package.
- What are some common applications of the HMC980LP4E? Common applications include microwave radio, VSATs, military and space, test instrumentation, fiber optic modulator driver biasing, CATV laser driver biasing, cellular base stations, and wireless infrastructure equipment.
- How does the HMC980LP4E ensure safe power-up and power-down of the external amplifier? The HMC980LP4E ensures safe power-up and power-down through automatic sequencing, keeping the external amplifier pinched off before applying VDRAIN and enabling the active bias loop.
