12-Bit, Monitor And Control System With Multichannel, ADC, DACs, Temperature Sensor And Current Sense
The AD7294 contains all the functions required for general-purpose monitoring and control of current, voltage, and temperature integrated into a single-chip solution. The part includes low voltage (200 mV) Analog input sense Amplifiers for current monitoring across shunt resistors, temperature sense inputs, and four uncommitted Analog input channels multiplexed into a 200 kSPS SAR Analog-to-digital converter (ADC). An internal low ppm reference is provided to drive both the digital-to-analog converter (DAC) and ADC Four 12-bit DACs provide the outputs for voltage control. The AD7294 also includes limit Registers for alarm functions. The part is designed on a high voltage DMOS process for high voltage compliance, 59.4 V on the Current Sense inputs, and up to 15 V DAC output voltage.
The DACs provide digital control with 1.2 mV resolution to control the bias currents of the Power Transistors Thermal Diode based Temperature Sensors are incorporated to compensate for temperature effects. The ADC monitors the high-side current and temperature. All this functionality is provided in a 56-lead LFCSP and a 64-lead TQFP operating over a temperature range of 40C to +105C.
Data Sheet, Rev. PrD, 10/07
By Analog Devices, Inc.
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