16-Bit, 6 MSPS, PulSAR Differential ADC Data Sheet AD7625 FEATURES FUNCTIONAL BLOCK DIAGRAM REFIN REF VCM Throughput: 6 MSPS SNR: 93 dB VIO 1.2V 2 CLOCK INL: 0.45 LSB typical, 1 LSB maximum BAND GAP LOGIC DNL: 0.3 LSB typical, 0.5 LSB maximum IN+ CAP CNV+, CNV DAC IN Power dissipation: 135 mW 32-lead LFCSP (5 mm 5 mm) D+, D SERIAL SAR SAR architecture DCO+, DCO LVDS AD7625 CLK+, CLK No latency/no pipeline delay 16-bit resolution with no missing codes Figure 1. Zero error: 1.5 LSB GENERAL DESCRIPTION Differential input voltage: 4.096 V Serial LVDS interface The AD7625 is a 16-bit, 6 MSPS, charge redistribution successive Self-clocked mode approximation register (SAR) based architecture analog-to-digital Echoed-clock mode converter (ADC). SAR architecture allows unmatched perfor- Can use LVDS or CMOS for conversion control (CNV signal) mance both in noise (93 dB SNR) and in linearity (1 LSB). The Reference options AD7625 contains a high speed, 16-bit sampling ADC, an internal Internal: 4.096 V conversion clock, and an internal buffered reference. On the External (1.2 V) buffered to 4.096 V CNV rising edge, it samples the voltage difference between the External: 4.096 V IN+ and IN pins. The voltages on these pins swing in opposite phase between 0 V and REF. The 4.096 V reference voltage, REF, APPLICATIONS can be generated internally or applied externally. High dynamic range telecommunications All converted results are available on a single LVDS self-clocked Receivers or echoed-clock serial interface, reducing external hardware Digital imaging systems connections. High speed data acquisition Spectrum analysis The AD7625 is housed in a 32-lead, 5 mm 5 mm LFCSP with Test equipment operation specified from 40C to +85C. Table 1. Fast PulSAR ADC Selection Input Type Resolution (Bits) 1 MSPS to <2 MSPS 2 MSPS to 3 MSPS 5 MSPS 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 18 AD7643 AD7641 AD7960 AD7982 AD7986 AD7984 Rev. B 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 20092015 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. 07652-001AD7625 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Circuit Information .................................................................... 13 Applications ....................................................................................... 1 Converter Information .............................................................. 13 Functional Block Diagram .............................................................. 1 Transfer Functions ..................................................................... 14 General Description ......................................................................... 1 Analog Inputs ............................................................................. 14 Revision History ............................................................................... 2 Typical Connection Diagram ................................................... 15 Specif icat ions ..................................................................................... 3 Driving the AD7625 ................................................................... 16 Timing Specifications .................................................................. 5 Voltage Reference Options ........................................................ 17 Absolute Maximum Ratings ............................................................ 6 Power Supply ............................................................................... 18 Thermal Resistance ...................................................................... 6 Digital Interface .......................................................................... 19 ESD Caution .................................................................................. 6 Applications Information .............................................................. 21 Pin Configuration and Function Descriptions ............................. 7 Layout, Decoupling, and Grounding ....................................... 21 Typical Performance Characteristics ............................................. 9 Outline Dimensions ....................................................................... 22 Terminology .................................................................................... 12 Ordering Guide .......................................................................... 22 Theory of Operation ...................................................................... 13 REVISION HISTORY 10/15Rev. A to Rev. B 7/12Rev. 0 to Rev. A Changes to Table 1 ............................................................................ 1 Change to Table 5 .............................................................................. 6 Added Aperture Delay Parameter and Current Drain Parameter, Changes to Figure 2 ........................................................................... 7 Table 2 ................................................................................................ 3 Updated Outline Dimensions (Changed CP-32-2 to CP-32-7) .... 22 Change s to CLK Period Parameter and Endnote 2, Table 3 ... 5 Changes to Ordering Guide .......................................................... 22 Changes to Figure 32 Caption and Ordering Guide .................. 22 1/09Revision 0: Initial Version Rev. B Page 2 of 24