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AD7293 Datasheet(PDF) 1 Page - Analog Devices |
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AD7293 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 79 page  12-Bit Power Amplifier Current Controller with ADC, DACs, and Temperature and Current Sensors Data Sheet AD7293 Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2016–2018 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES 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 APPLICATIONS GaN and GaAs power amplifier monitoring and controls Base station power amplifiers General-purpose system monitoring and controls GENERAL DESCRIPTION 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. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM AD7293 UNIPOLAR DAC 0V TO 5V 2.5V TO 7.5V 5V TO 10V 0V TO +5V –4V TO +1V –5V TO 0V BIPOLAR DAC PAVDD PA_ON PMOS CONTROL × 1 2 ALERT AND LIMIT REGISTERS CONTROL LOGIC MUX 2.5V 1.25V PRECISION 2.5V REFERENCE 12-BIT SAR ADC Σ – + D1+ D1– D0+ D0– SPI INTERFACE RESET LOGIC DIGITAL INPUT/OUTPUT LDAC AND CLAMP CONTROL Figure 1. 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. Note that throughout this data sheet, multifunction pins, such as GPIO4/ALERT1, are referred to either by the entire pin name or by a single function of the pin, for example, ALERT1, when only that function is relevant. 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. |
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