AD7294-2:  12-Bit Monitor and Control System with Multichannel ADC, DACs, Temperature Sensor, and Current Sense

Product Details

Product Status:Recommended for New Designs

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

Functional Block Diagram for AD7294-2

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AD7294-2 Model Options
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.

AD7294-2 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7294-2SDZ Status: Production Evaluation Board $59.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Board $99.00 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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