Overview
The HMC980LP4ETR from Analog Devices Inc. is a high-current, active bias controller designed to provide a comprehensive biasing solution for various types of amplifiers. This device automatically adjusts the gate voltage of an external amplifier to maintain a constant drain current, eliminating the need for calibration procedures. It 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. The HMC980LP4ETR ensures safe power-up and power-down sequencing, and it includes features such as an integrated negative voltage generator and overcurrent/undercurrent alarm capabilities.
Key Specifications
| Parameter | Description |
|---|---|
| Supply Voltage | 5 V to 16.5 V |
| Drain Current | Up to 1.6 A |
| Gate Current | Sink or source up to ±4 mA |
| Package Type | 24-lead, 4 mm × 4 mm LFCSP (Leadless Chip Scale Package) |
| Thermal Characteristics | Exposed backside pad for improved thermal performance |
| Compliance | RoHS compliant |
| Digital Supply Voltage | 3.3 V to 5 V |
| Reference Voltage | 1.44 V from internal LDO regulator |
Key Features
- Automatic gate voltage adjustment without calibration
- Integrated negative voltage generator for depletion mode amplifiers
- Fast enable/disable and power-up/power-down sequencing
- TRIGOUT output for daisy chaining
- Overcurrent/undercurrent alarm with hysteresis
- Secondary gate voltage (VG2) generation
- Gate control to sink or source current up to ±4 mA
- Stable RF amplifier biasing over supply, temperature, and process variations
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 station and wireless infrastructure equipment
Q & A
- What is the primary function of the HMC980LP4ETR?
The HMC980LP4ETR 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 HMC980LP4ETR support?
The device supports both enhancement and depletion mode Class A amplifiers.
- What is the range of supply voltage and drain current for the HMC980LP4ETR?
The supply voltage ranges from 5 V to 16.5 V, and the drain current can be up to 1.6 A.
- Does the HMC980LP4ETR have an integrated negative voltage generator?
Yes, it includes an integrated negative voltage generator for depletion mode amplifiers.
- How does the HMC980LP4ETR ensure safe power-up and power-down?
The device provides automatic power-up and power-down sequencing to ensure the safe powering of the external amplifier.
- What is the purpose of the TRIGOUT output?
The TRIGOUT output is used for daisy chaining.
- Does the HMC980LP4ETR have overcurrent/undercurrent alarm features?
Yes, it includes built-in overcurrent and undercurrent alarm features with hysteresis.
- Can the gate current be both sunk and sourced by the HMC980LP4ETR?
Yes, the gate control can both sink and source current up to ±4 mA.
- What is the package type and thermal characteristics of the HMC980LP4ETR?
The device is housed in a 24-lead, 4 mm × 4 mm LFCSP package with an exposed backside pad for improved thermal performance.
- Is the HMC980LP4ETR RoHS compliant?
Yes, the HMC980LP4ETR is RoHS compliant.
