Maxim Integrated Products introduces the AX11014/MAX11015 ICs that set and control bias conditions for dual MESFET power devices found in point-to-point communication and other microwave base stations. The MAX11014 integrates closed-loop drain-current control for class A MESFET amplifier operation, while the MAX11015 sets the MESFET gate voltage for class AB operation. Both devices integrate SRAM look-up tables (LUTs) that can be used to store temperature and drain-current compensation data. Each device includes dual, high-side, current-sense amplifiers to monitor the MESFET drain currents through the voltage drop across the sense resistors in the 0 to 625 mV range. External diode-connected transistors monitor the MESFET temperatures, while an internal temperature sensor measures the local die temperature. An internal DAC sets the voltages across the current-sense resistors by controlling the gate voltages. The internal 12-bit SAR ADC digitizes internal and external temperature, internal DAC voltages, current-sense amplifier voltages and external gate voltages. Two of the eleven ADC channels are available as general-purpose analog inputs for analog system monitoring. An internal reference provides a well-regulated, low-noise, +2.5 V reference for the ADC, DAC and temperature sensors, while still allowing the flexibility to operate from the ADC's and DAC's individual external references.
Maxim Integrated Products
Maxim Integrated Products, Inc.
http://www.maxim-ic.com
