Overview

Features and Benefits

  • 4 closed-loop power amplifier (PA) drain current controllers
  • Built-in PA protection, sequencing, and alert features
  • Compatible with both depletion mode and enhancement mode power amplifiers
  • Highly integrated
    • 4 uncommitted 12-bit analog-to-digital converter (ADC) inputs
      • ±0.5 LSB typical integral nonlinearity (INL)
    • Eight 12-bit voltage digital-to-analog converters (DACs)
      • 1.3 μs maximum settling
    • 4 high-side current sense amplifiers, ±0.1% gain error
    • 2 external temperature sensor inputs, ±1.1°C accuracy
    • Internal temperature sensor, ±1.25°C accuracy
    • 2.5 V on-chip reference
  • Flexible monitoring and control ranges
    • ADC input ranges: 0 V to 1.25 V, 0 V to 2.5 V, and 0 V to 5 V
    • Bipolar DAC ranges: 0 V to +5 V, −4 V to +1 V, and −5 V to 0 V
    • Bipolar DAC reset and clamping relative to VCLAMPx voltage
    • Unipolar DAC ranges: 0 V to 5 V, 2.5 V to 7.5 V, and 5 V to 10 V
    • Current sense gain: 6.25, 12.5, 25, 50, 100, and more
    • Adjustable closed-loop setpoint ramp time
  • High-side voltage current sensing
    • 4 current sense inputs
      • 4 V to AVSS + 60 V, ±200 mV input range
  • Small package and flexible interface
    • Serial port interface (SPI) with VDRIVE supporting 1.8 V, 3 V, and 5 V interfaces
    • 56-lead LFCSP
  • Temperature range: −40°C to +125°C

Product Details

The AD7293 is a PA drain current controller containing functionality for general-purpose monitoring and control of current, voltage, and temperature, integrated into a single chip solution with an SPI-compatible interface.

The device features a 4-channel, 12-bit successive approximation register (SAR) ADC, eight 12-bit DACs (four bipolar and four unipolar with output ranges that can be configured to shut down under external pin control), a ±1.25°C accurate internal temperature sensor, and eight general-purpose input/output (GPIO) pins.

The device also includes limit registers for alert functions and four high-side current sense amplifiers to measure current across external shunt resistors. These amplifiers can be optionally set to operate as part of four independent closed-loop drain current controllers.

A high accuracy 2.5 V internal reference is provided to drive the DACs and the ADC. The 12-bit ADC monitors and digitizes the internal temperature sensor, and two inputs are included for the external diode temperature sensors.

Product Highlights

  1. Four independent closed-loop drain current controllers.
  2. Built-in monitoring, sequencing, and alert features.
  3. Compatible with both depletion mode and enhancement mode power amplifiers.

Applications

  • GaN and GaAs power amplifier monitoring and controls
  • Base station power amplifiers
  • General-purpose system monitoring and controls

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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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.


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Evaluation Boards Pricing displayed is based on 1-piece.
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.