Product category: Analogue and Mixed Signal ICs
News Release from: Maxim Integrated Products | Subject: MAX11014 and MAX11015
Edited by the Electronicstalk Editorial Team on 03 March 2006
ICs take control of basestation MESFETs
The MAX11014 and MAX11015 devices set and control bias conditions for dual MESFET power devices found in point-to-point communication and other microwave basestations.
New from Maxim Integrated Products, the MAX11014 and MAX11015 devices set and control bias conditions for dual MESFET power devices found in point-to-point communication and other microwave basestations The MAX11014 integrates closed-loop drain-current control for class A MESFET amplifier operation, whereas the MAX11015 sets the MESFET gate voltage for class AB operation
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX11014 and MAX11015 are unique in their unmatched level of integration.
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 625mV range.
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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 12bit SAR ADC digitises internal and external temperature, internal DAC voltages, current-sense amplifier voltages, and external gate voltages.
Two of the 11 ADC channels are available as general-purpose analogue inputs for analogue system monitoring.
An internal reference provides a well-regulated, low-noise, +2.5V 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.
The MAX11014's gate-drive amplifier functions as an integrator for the drain-current control loop, while the MAX11015's gate-drive amplifier functions with a gain of -2 for class AB applications.
The current-limited gate-drive amplifier can be fast clamped to a programmable analogue voltage independent of the digital input from the serial interface.
Both the MAX11014 and MAX11015 include self-calibration modes to minimise error over time, temperature, and supply voltage.
These two bias controllers communicate over a 20MHz SPI-compatible four-wire serial interface or a 3.4MHz I2C-compatible serial interface (pin-selectable).
They operate from a +4.75 to +5.25V analogue supply, a +2.7 to +5.25V digital supply, and a -4.5 to -5.5V gate-drive supply.
The MAX11014 and MAX11015 are available in 48-pin, thin QFN packages specified over the -40 to +105C temperature range.
Prices start at $10.60 (1000-up, FOB USA).
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