18-Bit, 1.5 LSB INL, 400 kSPS PulSAR Differential ADC in MSOP/LFCSP Data Sheet AD7690 FEATURES APPLICATION EXAMPLE +2.5V TO +5V +5V 18-bit resolution with no missing codes Throughput: 400 kSPS INL: 0.75 LSB typical, 1.5 LSB maximum (6 ppm of FSR) VIO +1.8V TO VDD Dynamic range: 102 dB at 400 kSPS REF VDD IN+ SDI Oversampled dynamic range: 125 dB at 1 kSPS SCK 3- OR 4-WIRE 10V, 5V, ... INTERFACE Noise-free code resolution: 20 bits at 1 kSPS SDO (SPI, DAISY CHAIN, CS) IN GND CNV Effective resolution: 22.7 bits at 1 kSPS ADA4941-1 SINAD: 101.5 dB at 1 kHz AD7690 THD: 125 dB at 1 kHz Figure 2. True differential analog input range: VREF 0 V to V with V up to VDD on both inputs REF REF Table 1. MSOP, LFCSP/SOT-23 14-/16-/18-Bit PulSAR ADC No pipeline delay 400 kSPS 100 250 to 1000 ADC Single-supply 5 V operation with Type kSPS kSPS 500 kSPS kSPS Driver 1.8 V/2.5 V/3 V/5 V logic interface 18-Bit True AD7691 AD7690 AD7982 ADA4941 Proprietary serial interface Differential AD7982 ADA4841 SPI/QSPI/MICROWIRE/DSP compatible 16-Bit True AD7684 AD7687 AD7688 ADA4941 Daisy-chain multiple ADCs and busy indicator Differential AD7693 ADA4841 Power dissipation 16-Bit Pseudo AD7680 AD7685 AD7686 AD7980 ADA4841 Differential AD7683 AD7694 4.25 W at 100 SPS 14-Bit Pseudo AD7940 AD7942 AD7946 ADA4841 4.25 mW at 100 kSPS Differential Standby current: 1 nA 10-lead package: MSOP (MSOP-8 size) and 3 mm 3 mm LFCSP (SOT-23 size) GENERAL DESCRIPTION Pin-for-pin compatible with LFCSP/MSOP PulSAR ADCs 1 The AD7690 is an 18-bit, successive approximation, analog-to- APPLICATIONS digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 18-bit sampling ADC Battery-powered equipment with no missing codes, an internal conversion clock, and a Data acquisition versatile serial interface port. On the CNV rising edge, it Seismic data acquisition systems samples the voltage difference between the IN+ and IN pins. DVMs The voltages on these pins swing in opposite phase between 0 V Instrumentation and REF. The reference voltage, REF, is applied externally and Medical instruments can be set up to the supply voltage. 1.5 POSITIVE INL = +0.42LSB NEGATIVE INL = 0.6LSB The power of the AD7690 scales linearly with the throughput. 1.0 The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single, 0.5 3-wire bus and provides an optional busy indicator. It is compatible 0 with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIO supply. The AD7690 is housed in a 10-lead MSOP or a 10-lead LFCSP 0.5 with operation specified from 40C to +85C. 1.0 1 Protected by U.S. Patent 6,703,961. 1.5 0 65536 131072 196608 262144 CODE Figure 1. Integral Nonlinearity vs. Code Rev. C 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 20062014 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. INL (LSB) 05792-025 05792-001AD7690* PRODUCT PAGE QUICK LINKS Last Content Update: 02/23/2017 COMPARABLE PARTS REFERENCE MATERIALS View a parametric search of comparable parts. Technical Articles MS-1779: Nine Often Overlooked ADC Specifications EVALUATION KITS MS-2210: Designing Power Supplies for High Speed ADC AD7690 Evaluation Kit Tutorials Precision ADC PMOD Compatible Boards MT-074: Differential Drivers for Precision ADCs DOCUMENTATION DESIGN RESOURCES Application Notes AD7690 Material Declaration AN-931: Understanding PulSAR ADC Support Circuitry PCN-PDN Information AN-932: Power Supply Sequencing Quality And Reliability Data Sheet Symbols and Footprints AD7690: 18-Bit, 1.5 LSB INL, 400 kSPS PulSAR Differential ADC in MSOP/QFN Data Sheet DISCUSSIONS User Guides View all AD7690 EngineerZone Discussions. UG-340: Evaluation Board for the 10-Lead Family 14-/16-/ 18-Bit PulSAR ADCs SAMPLE AND BUY UG-682: 6-Lead SOT-23 ADC Driver for the 8-/10-Lead Visit the product page to see pricing options. Family of 14-/16-/18-Bit PulSAR ADC Evaluation Boards TECHNICAL SUPPORT SOFTWARE AND SYSTEMS REQUIREMENTS Submit a technical question or find your regional support AD7690 FMC-SDP Interposer & Evaluation Board / Xilinx number. KC705 Reference Design BeMicro FPGA Project for AD7690 with Nios driver DOCUMENT FEEDBACK Submit feedback for this data sheet. TOOLS AND SIMULATIONS AD7685 IBIS Models This page is dynamically generated by Analog Devices, Inc., and inserted into this data sheet. A dynamic change to the content on this page will not trigger a change to either the revision number or the content of the product data sheet. This dynamic page may be frequently modified.