●Product Details
●The AD7294-2 contains all the functions that are 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 SAR analog-to-digital converter (ADC) with a 3 μs conversion time. A high accuracy internal reference is provided to drive both the digital-to-analog converters (DACs) and the ADC. Four 12-bit DACs provide the outputs for voltage control. The AD7294-2 also includes limit registers for alarm functions. The part is designed for high voltage compliance: 59.4 V on the current sense inputs and up to a 15 V DAC output voltage.
●The AD7294-2 is a highly integrated solution that offers all the functionality necessary for precise control of the power amplifier in cellular base station applications. In these types of applications, the DACs provide 12-bit 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. This functionality is provided in a 64-lead TQFP, which operates over a temperature range of −40°C to +105°C.
●APPLICATIONS
● Cellular base stations
●GSM, EDGE, UMTS, CDMA, TD-SCDMA, W-CDMA, WiMAXM
● Point-to-multipoint and other RF transmission systems
● 12 V, 24 V, 48 V automotive applications
● Industrial controls
●### Features and Benefits
● 12-bit SAR ADC with 3 μs conversion time
●4 uncommitted analog inputs
●Differential/single-ended
●VREF, 2 × VREF input ranges
● 2 high-side current sense inputs
●5 V to 59.4 V operating range
●0.75% maximum gain error
●±200 mV input range
● 2 external diode temperature sensor inputs
●−55°C to +150°C measurement range
●±2°C accuracy
●Series resistance cancellation
● 1 internal temperature sensor: ±2°C accuracy
● Built-in monitoring features
●Minimum/maximum recorder for each channel
●Programmable alert thresholds
●Programmable hysteresis
● See data sheet for additional features
