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AD7294:  12-Bit Monitor and Control System with Multichannel ADC, DACs, Temperature Sensor, and Current Sense

Product Details


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 SAR analog-to-digital converter (ADC) with a 3 μs conver-sion 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 part 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 function-ality 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
  • FEATURES and BENEFITS

    • Chinese data sheet available
    • 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 additonal information)
    • 2 external diode temperature sensor inputs
      −55°C to +150°C measurement range - (Please see data sheet for addtional 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

    Functional Block Diagram for AD7294

    Documentation

    Title Content Type File Type
    AD7294: 12-Bit Monitor and Control System with Multichannel ADC, DACs, Temperature Sensor, and Current Sense Data Sheet (Rev H, 01/2012) (pdf, 1822 kB) Data Sheets PDF
    MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
    Multichannel I/O Data Converter Targets Basestations
    (eeProductCenter, 03/09/2006)
    Product Reviews HTML
    Analog Devices IC Monitors Wireless Base Stations
    (PowerPulse.Net, 3/7/2006)
    Product Reviews HTML
    Multichannel I/O Data Converter Targets Basestations
    (eeProductCenter, 3/9/2006)
    Product Reviews HTML
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Evaluation Kits & Symbols & Footprints

    Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

    Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

    Product Recommendations & Reference Designs

    Companion Products

    Suggested Companion Products


    Recommended External References for the AD7294
    • For applications requiring the lowest noise performance and output trim adjust, we recommend the ADR441.
    • For high output current applications, we recommend the ADR431.
    • For wide supply applications, we recommend the AD780.
    • For cost sensitive applications, we suggest the AD1582 or the ADR391.
    Recommended Driver Amplifiers for the AD7294
    • For applications requiring highest precision, we recommend the dual AD8606.
    • For applications requiring low cost, low temperature drift, good DC and AC precision, we recommend the dual AD8692.
    • For low power applications, we recommend the dual ADA4692-2.
    • For high speed, low noise, low distortion, we recommend the dual AD8022.
    • For controlling a power amplifier in a cellular basestation application, we recommend the AD8317 or the AD8362.
    Recommended Power Solutions
    • For selecting voltage regulator products, use ADIsimPower.

    Were these recommendations helpful?

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    Price, packaging, availability

    AD7294 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD7294BCPZ Status: Production 56 ld LFCSP (8x8mm) 56 Ind Tray, 260 $11.56 $9.83 Y  Material Info PCN Purchase Sample
    AD7294BCPZRL Status: Production 56 ld LFCSP (8x8mm) 56 Ind Reel, 2500 - $9.83 Y  Material Info PCN Purchase
    AD7294BSUZ Status: Production 64 ld TQFP(7x7mm) 64 Ind Tray, 250 $11.56 $9.83 Y  Material Info PCN Purchase Sample
    AD7294BSUZRL Status: Production 64 ld TQFP(7x7mm) 64 Ind Reel, 2000 - $9.83 Y  Material Info PCN Purchase
    Price Table Help

    The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

    AD7294 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    EVAL-AD7294EBZ Status: Production Evaluation Board $59.00 Yes -

    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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