AD7294-2BSUZ-RL

Monitor and Control System 22.22KSPS 12Bit Automotive 64Pin TQFP T/R

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**

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Cellular base stations

GSM, EDGE, UMTS, CDMA, TD-SCDMA, W-CDMA, WiMAXM

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Point-to-multipoint and other RF transmission systems

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12 V, 24 V, 48 V automotive applications

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Industrial controls

### Features and Benefits

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12-bit SAR ADC with 3 μs conversion time

4 uncommitted analog inputs

Differential/single-ended

VREF, 2 × VREF input ranges

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2 high-side current sense inputs

5 V to 59.4 V operating range

0.75% maximum gain error

±200 mV input range

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2 external diode temperature sensor inputs

−55°C to +150°C measurement range

±2°C accuracy

Series resistance cancellation

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1 internal temperature sensor: ±2°C accuracy

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Built-in monitoring features

Minimum/maximum recorder for each channel

Programmable alert thresholds

Programmable hysteresis

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See data sheet for additional features