18-Bit, 2.5 LSB INL, 100 kSPS SAR ADC AD7678 FUNCTIONAL BLOCK DIAGRAM FEATURES PDBUF REF REFGND DVDD DGND 18-bit resolution with no missing codes No pipeline delay (SAR architecture) AGND OVDD AVDD AD7678 Differential input range: V (V up to 5 V) REF REF SERIAL OGND REFBUFIN Throughput: 100 kSPS PORT INL: 2.5 LSB max (9.5 ppm of full scale) 18 IN+ SWITCHED D 17:0 CAP DAC Dynamic range: 103 dB typ (V = 5 V) IN REF BUSY S/(N+D): 100 dB typ 2 kHz (VREF = 5 V) PARALLEL RD INTERFACE Parallel (18-,16-, or 8-bit bus) and serial 5 V/3 V interface CLOCK CS SPI/QSPI/MICROWIRE/DSP compatible PD CONTROL LOGIC AND MODE0 CALIBRATION CIRCUITRY On-board reference buffer RESET MODE1 Single 5 V supply operation Power dissipation: 18 mW 100 kSPS CNVST 030840001 180 W 1 kSPS 48-lead LQFP or 48-lead LFCSP package Figure 1. Functional Block Diagram Pin-to-pin compatible upgrade of AD7674/AD7676/AD7679 Table 1. PulSAR Selection APPLICATIONS 800 CT scanners Type/kSPS 100250 500570 1000 High dynamic data acquisition Pseudo- AD7651 AD7650/AD7652 AD7653 Geophone and hydrophone sensors Differential AD7660/AD7661 AD7664/AD7666 AD7667 - replacement (low power, multichannel) True Bipolar AD7663 AD7665 AD7671 Instrumentation True AD7675 AD7676 AD7677 Spectrum analysis Differential Medical instruments 18-Bit AD7678 AD7679 AD7674 Multichannel/ AD7654 Simultaneous AD7655 GENERAL DESCRIPTION The AD7678 is an 18-bit, 100 kSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates on a PRODUCT HIGHLIGHTS single 5 V power supply. The part contains a high speed 18-bit 1. High Resolution, Fast Throughput. sampling ADC, an internal conversion clock, an internal The AD7678 is a 100 kSPS, charge redistribution, 18-bit reference buffer, error correction circuits, and both serial and SAR ADC (no latency). parallel system interface ports. 2. Excellent Accuracy. The part is available in 48-lead LQFP or 48-lead LFCSP The AD7678 has a maximum integral nonlinearity of packages with operation specified from 40C to +85C. 2.5 LSB with no missing 18-bit codes. 3. Serial or Parallel Interface. Versatile parallel (18-, 16-, or 8-bit bus) or 2-wire serial interface arrangement compatible with both 3 V and 5 V logic. Rev. A 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 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20032009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. AD7678* PRODUCT PAGE QUICK LINKS Last Content Update: 02/23/2017 COMPARABLE PARTS DESIGN RESOURCES View a parametric search of comparable parts. AD7678 Material Declaration PCN-PDN Information EVALUATION KITS Quality And Reliability AD7678 Evaluation Kit Symbols and Footprints DOCUMENTATION DISCUSSIONS Application Notes View all AD7678 EngineerZone Discussions. AN-931: Understanding PulSAR ADC Support Circuitry AN-932: Power Supply Sequencing SAMPLE AND BUY Data Sheet Visit the product page to see pricing options. AD7678: 18-Bit, 2.5 LSB INL, 100 kSPS SAR ADC Data Sheet TECHNICAL SUPPORT Product Highlight Submit a technical question or find your regional support 8- to 18-Bit SAR ADCs ... From the Leader in High number. Performance Analog DOCUMENT FEEDBACK REFERENCE MATERIALS Submit feedback for this data sheet. Technical Articles MS-2210: Designing Power Supplies for High Speed ADC 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.