12-Bit Power Amplifier Current Controller with ADC, DACs, and Temperature and Current Sensors Data Sheet AD7293 FEATURES SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM 4 closed-loop power amplifier (PA) drain current controllers PAV PRECISION PMOS DD 2.5V CONTROL Built-in PA protection, sequencing, and alert features PA ON REFERENCE Compatible with both depletion mode and enhancement mode AD7293 1 power amplifiers 2 1.25V 2.5V Highly integrated BIPOLAR 4 uncommitted 12-bit analog-to-digital converter (ADC) inputs DAC + 0.5 LSB typical integral nonlinearity (INL) 0V TO +5V Eight 12-bit voltage digital-to-analog converters (DACs) 4V TO +1V 5V TO 0V 12-BIT 1.3 s maximum settling SAR ADC 4 high-side current sense amplifiers, 0.1% gain error MUX ALERT 2 external temperature sensor inputs, 1.1C accuracy AND LIMIT REGISTERS Internal temperature sensor, 1.25C accuracy UNIPOLAR 2.5 V on-chip reference DAC D0+ Flexible monitoring and control ranges 0V TO 5V ADC input ranges: 0 V to 1.25 V, 0 V to 2.5 V, and 0 V to 5 V 2.5V TO 7.5V 5V TO 10V D0 Bipolar DAC ranges: 0 V to +5 V, 4 V to +1 V, and 5 V to 0 V D1+ Bipolar DAC reset and clamping relative to V voltage CLAMPx CONTROL Unipolar DAC ranges: 0 V to 5 V, 2.5 V to 7.5 V, and 5 V to 10 V LOGIC D1 Current sense gain: 6.25, 12.5, 25, 50, 100, and more RESET SPI DIGITAL LDAC AND LOGIC INTERFACE INPUT/OUTPUT CLAMP CONTROL Adjustable closed-loop setpoint ramp time High-side voltage current sensing 4 current sense inputs 4 V to AV + 60 V, 200 mV input range SS Small package and flexible interface Serial port interface (SPI) with V supporting 1.8 V, 3 V, and DRIVE 5 V interfaces Figure 1. 56-lead LFCSP Temperature range: 40C to +125C The device also includes limit registers for alert functions and four high-side current sense amplifiers to measure current across APPLICATIONS external shunt resistors. These amplifiers can be optionally set to GaN and GaAs power amplifier monitoring and controls operate as part of four independent closed-loop drain current Base station power amplifiers controllers. General-purpose system monitoring and controls A high accuracy 2.5 V internal reference is provided to drive the GENERAL DESCRIPTION DACs and the ADC. The 12-bit ADC monitors and digitizes the The AD7293 is a PA drain current controller containing internal temperature sensor, and two inputs are included for the functionality for general-purpose monitoring and control of external diode temperature sensors. current, voltage, and temperature, integrated into a single chip Note that throughout this data sheet, multifunction pins, such solution with an SPI-compatible interface. as GPIO4/ALERT1, are referred to either by the entire pin name The device features a 4-channel, 12-bit successive approximation or by a single function of the pin, for example, ALERT1, when register (SAR) ADC, eight 12-bit DACs (four bipolar and four only that function is relevant. unipolar with output ranges that can be configured to shut PRODUCT HIGHLIGHTS down under external pin control), a 1.25C accurate internal temperature sensor, and eight general-purpose input/output 1. Four independent closed-loop drain current controllers. (GPIO) pins. 2. Built-in monitoring, sequencing, and alert features. 3. Compatible with both depletion mode and enhancement mode power amplifiers. Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20162018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 4 ANALOG INPUTS RESET FACTORY TEST 4 RSx+ PIN 4 CURRENT 4 SUPPLY 4 BIPOLAR DAC SCLK MONITORING SENSE MONITORING MONITORING DOUT DIN CS GPIO0/IS BLANK TEMPERATURE SENSOR GPIO1/CONVST GPIO2/BUSY GPIO3/ALERT0 GPIO4/ALERT1 GPIO5/SLEEP0 GPIO6/SLEEP1 GPIO7/LDAC DGND AGND DAC CLAMPING 4 UNIPOLAR DACs 4 BIPOLAR DACs 4 CURRENT SENSORS 13016-001AD7293 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 AV and AV Alarm ................................................................ 31 DD SS Applications ....................................................................................... 1 Maximum and Minimum Pages ............................................... 31 General Description ......................................................................... 1 Hysteresis ..................................................................................... 31 Simplified Functional Block Diagram ........................................... 1 Register Settings.............................................................................. 32 Product Highlights ........................................................................... 1 Registers Common to All Pages ............................................... 33 Revision History ............................................................................... 3 Result 0/DAC Input (Page 0x00) .............................................. 34 Functional Block Diagrams ............................................................. 4 Result 1 (Page 0x01) ................................................................... 36 Specifications ..................................................................................... 6 Configuration (Page 0x02) ........................................................ 37 ADC ............................................................................................... 6 Sequence (Page 0x03) ................................................................ 46 DAC ................................................................................................ 7 High Limit 0 (Page 0x04) .......................................................... 48 Temperature Sensor ..................................................................... 8 High Limit 1 (Page 0x05) .......................................................... 49 Current Sensor .............................................................................. 9 Low Limit 0 (Page 0x06) ............................................................ 50 Closed-Loop Specifications......................................................... 9 Low Limit 1 (Page 0x07) ............................................................ 51 General ......................................................................................... 10 Hysteresis 0 (Page 0x08) ............................................................ 52 Timing Characteristics .............................................................. 11 Hysteresis 1 (Page 0x09) ............................................................ 53 Absolute Maximum Ratings .......................................................... 13 Minimum 0 (Page 0x0A) ........................................................... 54 Thermal Resistance .................................................................... 13 Minimum 1 (Page 0x0B) ........................................................... 55 ESD Caution ................................................................................ 13 Maximum 0 (Page 0x0C) .......................................................... 56 Pin Configuration and Function Descriptions ........................... 14 Maximum 1 (Page 0x0D) .......................................................... 57 Typical Performance Characteristics ........................................... 17 Offset 0 (Page 0x0E) ................................................................... 58 Theory of Operation ...................................................................... 22 Offset 1 (Page 0x0F) ................................................................... 60 Analog-to-Digital Converter (ADC) Overview ..................... 22 Alert (Page 0x10) ........................................................................ 61 ADC Transfer Functions ........................................................... 22 ALERT0 Pin Routing (Page 0x11) ........................................... 63 Analog Inputs .............................................................................. 23 ALERT1 Pin Routing (Page 0x12) ........................................... 67 Current Sensor ............................................................................ 23 Serial Port Interface ........................................................................ 71 Temperature Sensor ................................................................... 24 Interface Protocol ....................................................................... 71 Internal Channel Monitoring ................................................... 25 Modes of Opertion ..................................................................... 72 DAC Operation ........................................................................... 25 Applications Information .............................................................. 76 Reference ..................................................................................... 27 Base Station Power Amplifier Control .................................... 76 V Feature .............................................................................. 27 Depletion Mode Amplifier Biasing and Protection ............... 77 DRIVE Open-Loop Mode ....................................................................... 27 Loop Component Selection ...................................................... 78 Closed-Loop Mode .................................................................... 27 Outline Dimensions ....................................................................... 79 Digital Input/Output Registers ................................................. 29 Ordering Guide .......................................................................... 79 Load DAC (LDAC Pin).............................................................. 29 Alerts and Limits ........................................................................ 29 Rev. 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