16-Bit, 8-Channel, 500 kSPS PulSAR ADC Data Sheet AD7699 FEATURES FUNCTIONAL BLOCK DIAGRAM 5V 0.5V TO 4.096V 0.5V TO VDD 16-bit resolution with no missing codes 0.1F 10F 8-channel multiplexer with choice of inputs REFIN REF VDD Unipolar single-ended Differential (GND sense) 1.8V BAND GAP VIO TO Pseudo bipolar REF AD7699 VDD Throughput: 500 kSPS TEMP SENSOR INL: 0.5 LSB typical, 1.5 LSB maximum (23 ppm or FSR) IN0 CNV Dynamic range: 93.3 dB IN1 SCK IN2 16-BIT SAR SPI SERIAL SINAD: 91.5 dB at 20 kHz MUX IN3 INTERFACE ADC SDO THD: 97 dB at 20 kHz IN4 ONE-POLE DIN IN5 Analog input range: 0 V to V with V up to VDD REF REF LPF IN6 SEQUENCER IN7 Multiple reference types COM Internal 4.096 V GND External buffered (up to 4.096 V) External (up to VDD) Figure 1. Internal temperature sensor Table 1. Multichannel 14-/16-Bit PulSAR ADC Channel sequencer, selectable 1-pole filter, busy indicator Type Channels 250 kSPS 500 kSPS ADC Driver No pipeline delay, SAR architecture Single-supply 5 V operation with 14-Bit 8 AD7949 ADA4841-1 1.8 V to 5 V logic interface 16-Bit 4 AD7682 ADA4841-1 Serial interface compatible with SPI, MICROWIRE, 16-Bit 8 AD7689 AD7699 ADA4841-1 QSPI, and DSP Power dissipation GENERAL DESCRIPTION 26 mW at 500 kSPS 5.2 W at 100 SPS The AD7699 is an 8-channel, 16-bit, charge redistribution Standby current: 50 nA successive approximation register (SAR) analog-to-digital 20-lead 4 mm 4 mm LFCSP package converter (ADC) that operates from a single power supply, VDD. 20-lead 2.4 mm 2.4 mm WLCSP package The AD7699 contains all components for use in a multichannel, low power data acquisition system, including a true 16-bit SAR APPLICATIONS ADC with no missing codes an 8-channel low crosstalk multip- Battery-powered equipment lexer useful for configuring the inputs as single-ended (with or Medical instruments: ECG/EKG without ground sense), differential, or bipolar an internal 4.096 V Mobile communications: GPS low drift reference and buffer a temperature sensor a selectable Personal digital assistants one-pole filter and a sequencer that is useful when channels are Power line monitoring continuously scanned in order. Data acquisition Seismic data acquisition systems The AD7699 uses a simple serial port interface (SPI) for writing Instrumentation to the configuration register and receiving conversion results. Process control The SPI interface uses a separate supply, VIO, which is set to the host logic level. Power dissipation scales with throughput. The AD7699 is housed in a tiny 20-lead LFCSP and a 20-ball WLCSP with operation specified from 40C to +85C. Rev. G 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 20082018 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. 07354-001AD7699 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Voltage Reference Output/Input .............................................. 20 Applications ....................................................................................... 1 Power Supply ............................................................................... 21 Functional Block Diagram .............................................................. 1 Supplying the ADC from the Reference .................................. 22 General Description ......................................................................... 1 Digital Interface .............................................................................. 23 Revision History ............................................................................... 3 Reading/Writing During Conversion, Fast Hosts .................. 23 Specifications ..................................................................................... 4 Reading/Writing During Acquisition, Any Speed Hosts ...... 23 Timing Specifications ....................................................................... 6 Reading/Writing Spanning Conversion, Any Speed Host .... 23 Absolute Maximum Ratings ............................................................ 7 Configuration Register, CFG .................................................... 23 ESD Caution .................................................................................. 7 General Timing Without a Busy Indicator ............................. 25 Pin Configuration and Function Descriptions ............................. 8 General Timing With a Busy Indicator ................................... 26 Typical Performance Characteristics ........................................... 10 Read/Write Spanning Conversion Without a Busy Indicator ...................................................................................... 27 Terminology .................................................................................... 14 Read/Write Spanning Conversion with a Busy Indicator ..... 28 Theory of Operation ...................................................................... 15 Channel Sequencer .................................................................... 29 Overview ...................................................................................... 15 Application Hints ........................................................................... 30 Converter Operation .................................................................. 15 Layout .......................................................................................... 30 Transfer Functions...................................................................... 16 Evaluating AD7699 Performance ............................................. 30 Typical Connection Diagrams .................................................. 17 Outline Dimensions ....................................................................... 31 Analog Inputs .............................................................................. 18 Ordering Guide .......................................................................... 31 Driver Amplifier Choice ............................................................ 20 Rev. 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