16-Bit, 10 MSPS, PulSAR Differential ADC Data Sheet AD7626 FEATURES FUNCTIONAL BLOCK DIAGRAM REFIN REF VCM Throughput: 10 MSPS SNR: 91.5 dB 1.2V VIO 2 CLOCK 16-bit no missing codes BAND GAP LOGIC INL: 0.45 LSB IN+ CAP CNV+, CNV DAC IN DNL: 0.35 LSB Power dissipation: 136 mW D+, D SERIAL SAR DCO+, DCO 32-lead LFCSP (5 mm 5 mm) LVDS AD7626 CLK+, CLK SAR architecture No latency/pipeline delay Figure 1. 16-bit resolution with no missing codes GENERAL DESCRIPTION Zero error: 1 LSB Differential input range: 4.096 V The AD7626 is a 16-bit, 10 MSPS, charge redistribution Serial LVDS interface successive approximation register (SAR) based architecture Self clocked mode analog-to-digital converter (ADC). SAR architecture allows Echoed clock mode unmatched performance both in noise (91.5 dB SNR) and in LVDS or CMOS option for conversion control (CNV signal) linearity (0.45 LSB INL). The AD7626 contains a high speed, Reference options 16-bit sampling ADC, an internal conversion clock, and an Internal: 4.096 V internal buffered reference. On the CNV edge, it samples the External (1.2 V) buffered to 4.096 V voltage difference between the IN+ and IN pins. The voltages External: 4.096 V on these pins swing in opposite phase between 0 V and REF. The 4.096 V reference voltage, REF, can be generated internally APPLICATIONS or applied externally. Digital imaging systems All converted results are available on a single low voltage Digital X-ray differential signaling (LVDS) self clocked or echoed clock serial Digital MRI interface, reducing external hardware connections. CCD and IR cameras High speed data acquisition The AD7626 is housed in a 32-lead, 5 mm 5 mm LFCSP with High dynamic range telecommunications receivers operation specified from 40C to +85C. Spectrum analysis Test equipment Table 1. Fast PulSAR ADC Selection Input Type Resolution (Bits) 1 MSPS to <2 MSPS 2 MSPS to 3 MSPS 5 MSPS to 6 MSPS 10 MSPS Differential (Ground Sense) 16 AD7653 AD7985 AD7667 AD7980 AD7983 True Bipolar 16 AD7671 Differential (Antiphase) 16 AD7677 AD7621 AD7625 AD7626 AD7623 AD7622 AD7961 Differential (Antiphase) 18 AD7643 AD7641 AD7960 AD7982 AD7986 AD7984 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 20092016 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 07648-001AD7626 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 16 Applications ....................................................................................... 1 Circuit Information .................................................................... 16 Functional Block Diagram .............................................................. 1 Converter Information .............................................................. 16 General Description ......................................................................... 1 Transfer Functions ..................................................................... 17 Revision History ............................................................................... 2 Analog Inputs.............................................................................. 17 Specifications ..................................................................................... 3 Typical Connection Diagram ................................................... 18 Timing Specifications .................................................................. 6 Driving the AD7626................................................................... 19 Timing Diagrams .......................................................................... 7 Voltage Reference Options ........................................................ 21 Absolute Maximum Ratings ............................................................ 8 Power Supply ............................................................................... 22 Thermal Resistance ...................................................................... 8 Digital Interface .......................................................................... 23 ESD Caution .................................................................................. 8 Applications Information .............................................................. 25 Pin Configuration and Function Descriptions ............................. 9 Layout, Decoupling, and Grounding ....................................... 25 Typical Performance Characteristics ........................................... 11 Outline Dimensions ....................................................................... 26 Terminology .................................................................................... 15 Ordering Guide .......................................................................... 26 REVISION HISTORY 4/16Rev. C to Rev. D 7/12Rev. A to Rev. B Changes to Internal Reference Parameter, Table 2 ....................... 4 Changed CP-32-2 Package to CP-32-7 Package ............. Universal Added Acquisition Time Parameter, Table 3 ................................ 6 Changes to Figure 4 ........................................................................... 8 Change to Table 5 ............................................................................. 8 Updated Outline Dimensions ...................................................... 25 Change to Figure 32 Caption and Figure 33 Caption ................ 19 Changes to Ordering Guide .......................................................... 25 10/15Rev. B to Rev. C 1/10Rev. 0 to Rev. A Changes to Table 1 ............................................................................ 1 Changes to Description of Pin 5 and Pin 6, Table 6 ..................... 8 Added Aperture Delay Parameter and Current Drain Changes to Power-Up Section ...................................................... 21 Parameter, Table 2 ............................................................................. 3 Changes to Ordering Guide .......................................................... 26 9/09Revision 0: Initial Version Rev. D Page 2 of 29