AD7294

NOT RECOMMENDED FOR NEW DESIGNS

12-Bit Monitor and Control System with Multichannel ADC, DACs, Temperature Sensor, and Current Sense

Data Sheet (Rev. I) Product Selection Table
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Overview

  • 12-bit SAR ADC with 3 μs conversion time 
  • 4 uncommitted analog inputs - (Please see data sheet for additional information)
  • 2 high-side current sense inputs
    5 V to 59.4 V operating range - (Please see data sheet for additional information)
  • 2 external diode temperature sensor inputs
    −55°C to +150°C measurement range (Please see data sheet for additional information)
  • 1 internal temperature sensor ±2°C accuracy
  • Built-in monitoring features
    Minimum/maximum recorder for each channel - (Please see data sheet for additional information)
  • Four 12-bit monotonic 15 V DACs
  • 5 V span, 0 V to 10 V offset - (Please see data sheet for additional information)
  • Internal 2.5 V reference
  • 2-wire fast mode I2C interface
  • Temperature range: −40°C to +105°C
  • Package type: 64-lead TQFP or 56-lead LFCSP

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 device 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 converter (DAC) and ADC. Four 12-bit DACs provide the outputs for voltage control. The AD7294 also includes limit registers for alarm functions. The device is designed on Analog Devices, Inc., high voltage DMOS process for high voltage compliance, 59.4 V on the current sense inputs, and up to a 15 V DAC output voltage.

The AD7294 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. All this functionality is provided in a 64-lead TQFP or a 56-lead LFCSP operating over a temperature range of −40°C to +105°C.

APPLICATIONS

  • Cellular base stations
    GSM, EDGE, UMTS, CDMA, TD-SCDMA, W-CDMA, WiMAX
  • Point-to-multipoint and other RF transmission systems
  • 12 V, 24 V, 48 V automotive applications
  • Industrial controls

    • AD7294
    12-Bit Monitor and Control System with Multichannel ADC, DACs, Temperature Sensor, and Current Sense
    AD7294 Functional Block Diagram AD7294 Pin Configuration
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    Documentation

    Data Sheet 1

    User Guide 1

    Technical Articles 1

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    Hardware Ecosystem

    Parts Product Life Cycle Description
    Operational Amplifiers (Op Amps) 4
    ADA4692-2
    		PRODUCTION Low Power, 3.6 MHz, Low Noise, Rail-to-Rail Output, Operational Amplifiers
    AD8692
    		PRODUCTION Low Cost, Low Noise, Dual CMOS Rail-to-Rail Output Operational Amplifier
    AD8606
    		PRODUCTION Precision, Low Noise, RRIO, CMOS Op Amp (Dual)
    AD8022
    		PRODUCTION Dual High Speed, Low Noise Op Amp
    RF Power Detectors 2
    AD8317
    		PRODUCTION 1 MHz to 10 GHz, 55 dB Log Detector/Controller
    AD8362
    		PRODUCTION

    50 Hz to 3.8 GHz 65d dB TruPwr™ Detector
    Voltage References 5
    AD1582
    		PRODUCTION 2.5V Micropower, Precisions Series Mode Voltage References
    ADR391
    		PRODUCTION 2.5V Micropower, Low Noise Precision Voltage Reference with Shutdown
    ADR431
    		PRODUCTION Ultralow Noise XFET® Voltage References with Current Sink and Source Capability
    ADR441
    		PRODUCTION Ultralow Noise, LDO XFET® 2.5V Voltage Reference w/Current Sink and Source
    AD780
    		PRODUCTION 2.5 V/3.0 V High Precision Reference
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    Evaluation Kits
    EVAL-AD7294
    AD7294 Evaluation Board

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