4-Channel, 4 MSPS, 16-Bit/14-Bit/12-Bit, Dual, Simultaneous Sampling SAR ADCs Data Sheet AD7386/AD7387/AD7388 FEATURES GENERAL DESCRIPTION 16-bit, 14-bit, or 12-bit dual simultaneous sampling SAR ADC The AD7386/AD7387/AD7388 are 16-bit, 14-bit, and 12-bit dual, Single-ended analog inputs simultaneous sampling, high speed, successive approximation 4-channel with 2:1 multiplexers register (SAR), analog-to-digital converters (ADCs) that operate Channel sequencer mode from a 3.0 V to 3.6 V power supply and feature throughput rates High throughput rate of up to 4 MSPS of up to 4 MSPS. The analog input types are single-ended and SNR (typical) are sampled and converted on the falling edge of CS. 87.5 dB (AD7386), VREF = 3.3 V external 84 dB (AD7387), VREF = 3.3 V external The AD7386/AD7387/AD7388 have an on-chip sequencer and 73.8 dB (AD7388) integrated on-chip oversampling block to improve dynamic 93 dB with OSR = 8, VREF = 2.5 V internal (AD7386) range and reduce noise at lower bandwidths. A buffered internal On-chip oversampling functions 2.5 V reference is included. Alternatively, an external reference up INL (typical) to 3.3 V can be used. The conversion process and data 1.5 LSB (AD7386) acquisition use standard control inputs, allowing interfacing to 0.5 LSB (AD7387) microprocessors or digital signal processors (DSPs). The AD7386 0.2 LSB (AD7388) is compatible with 1.8 V, 2.5 V, and 3.3 V interfaces by using the Resolution boost function separate logic supply. 2.5 V internal reference at 10 ppm/C (maximum) Alert function The AD7386/AD7387/AD7388 are available in a 16-lead LFCSP 40C to +125C temperature range with operation specified from 40C to +125C. 16-lead, 3 mm 3 mm LFCSP PRODUCT HIGHLIGHTS APPLICATIONS 1. 4-channel, dual simultaneous sampling ADC. Motor control position feedback 2. Pin-compatible product family. Motor control current sense 3. High 4 MSPS throughput rate. Sonars 4. Space-saving, 3 mm 3 mm LFCSP. Power quality 5. Integrated oversampling block to increase dynamic range Data acquisition systems and SNR and to reduce SCLK speed requirements. Erbium doped fiber amplifier (EDFA) applications 6. Single-ended analog inputs. Inphase and quadrature demodulation 7. Small sampling capacitor reduces amplifier drive burden. FUNCTIONAL BLOCK DIAGRAM 3.3V 3.3V 1F 1F V V CC LOGIC V REF C A A0 R IN 0V OVERSAMPLING ADC A SDOA R A A1 IN V REF C REFIO 0V REFCAP OSCILLATOR GND DIGITAL REFERENCE CONTROLLER SCLK CONTROL REGCAP LDO SDI LOGIC CS V REF C A B0 R IN 0V ADC B OVERSAMPLING SDOB/ALERT A B1 R IN V REF C AD7386/AD7387/AD7388 0V GND Figure 1. Rev. A 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 2019 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com MUX MUX 20799-001AD7386/AD7387/AD7388 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Modes of Operation ....................................................................... 20 Applications ....................................................................................... 1 Channel Selection ....................................................................... 20 General Description ......................................................................... 1 Sequencer .................................................................................... 20 Product Highlights ........................................................................... 1 Oversampling .............................................................................. 21 Functional Block Diagram .............................................................. 1 Resolution Boost ........................................................................ 25 Revision History ............................................................................... 3 Alert ............................................................................................. 25 Specifications ..................................................................................... 4 Power Modes ............................................................................... 26 AD7386 .......................................................................................... 4 Internal and External References ............................................. 26 AD7387 .......................................................................................... 5 Software Reset ............................................................................. 26 AD7388 .......................................................................................... 6 Diagnostic Self Test .................................................................... 26 All Devices ..................................................................................... 7 Interface ........................................................................................... 27 Timing Specifications .................................................................. 9 Reading Conversion Results ..................................................... 27 Absolute Maximum Ratings .......................................................... 11 Low Latency Readback .............................................................. 28 Thermal Resistance .................................................................... 11 Reading From Device Registers ............................................... 29 ESD Caution ................................................................................ 11 Writing to Device Registers ...................................................... 29 Pin Configuration and Function Descriptions ........................... 12 Registers ........................................................................................... 32 Typical Performance Characteristics ........................................... 13 Addressing Registers .................................................................. 32 Terminology .................................................................................... 16 CONFIGURATION1 Register ................................................. 33 Theory of Operation ...................................................................... 17 CONFIGURATION2 Register ................................................. 34 Circuit Information .................................................................... 17 Alert Register .............................................................................. 35 Converter Operation .................................................................. 17 ALERT LOW THRESHOLD Register .................................. 36 Analog Input Structure .............................................................. 17 ALERT HIGH THRESHOLD Register ................................. 36 ADC Transfer Function ............................................................. 18 Outline Dimensions ....................................................................... 37 Applications Information .............................................................. 19 Ordering Guide .......................................................................... 37 Power Supply ............................................................................... 19 Rev. A Page 2 of 37