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AD7294:  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 SAR analog-to-digital ...More

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

Product Description

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 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

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    EVALUATION BOARDS & DEVELOPMENT KITS

    • 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
    • Resolution (Bits): 12bit
    • T-Put Rate: 200kSPS
    • # Chan: 9
    • Supply V: Multiple + Supplies
    • Interface: I²C/Ser 2-Wire,Ser
    • Ain Range: (Vref) p-p,2 V p-p,Uni (Vref),Uni (Vref) x 2
    • Pkg Type: CSP

    Functional Block Diagram for AD7294

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    Pricing, Packaging & Availability

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    Model
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    Status
    Status indicates the current lifecycle of the product. This can be one of 4 stages:
    • Pre-Release: The model has not been released to general production, but samples may be available.
    • Production: The model is currently being produced, and generally available for purchase and sampling.
    • Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
    • Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).
    Package Description
    The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

    For detailed drawings and chemical composition please consult our  Package Site

    Pin Count
    Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

    Temperature Range
    This is the acceptable operating range of the device. The various ranges specified are as follows:
    • Commercial: 0 to +70 degrees Celsius
    • Military : -55 to +125 degrees Celsius
    • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
    • Automotive: -40 to +125 degrees Celsius
    Price
    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.

    Production Availability
    This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.
    Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

    RoHS Compliant
    Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

    View PCN
    This is the list of Product Change Notifications (PCN) published on the web for this model. Click on the link to access PCN Information.Only select pre-2009 PCN�s are available on-line. To obtain a pre-2009 PCN, contact your ADI Sales Rep. For more information on ADI's PCN process, please visit our PCN Policy Statement page

    *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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.