8-Bit, 40/80/100 MSPS Dual A/D Converter AD9288 FUNCTIONAL BLOCK DIAGRAM FEATURES V Dual 8-bit, 40 MSPS, 80 MSPS, and 100 MSPS ADC DD Low power: 90 mW at 100 MSPS per channel AD9288 On-chip reference and track-and-hold ENC TIMING A 475 MHz analog bandwidth each channel A A 8 8 IN SNR = 47 dB 41 MHz D7 D0 T/H ADC A A A A IN 1 V p-p analog input range each channel SELECT 1 Single 3.0 V supply operation (2.7 V to 3.6 V) REF A IN Standby mode for single-channel operation REF SELECT 2 REF OUT Twos complement or offset binary output mode REF B IN DATA FORMAT SELECT Output data alignment mode A B 8 8 Pin-compatible 10-bit upgrade available IN T/H ADC D7 D0 B B A B IN APPLICATIONS ENC TIMING B Battery-powered instruments Hand-held scopemeters V GND V D DD Low cost digital oscilloscopes Figure 1. I and Q communications GENERAL DESCRIPTION The AD9288 is a dual 8-bit monolithic sampling analog-to- The Encode input is TTL/CMOS-compatible, and the 8-bit digital converter with on-chip track-and-hold circuits. It is digital outputs can be operated from 3.0 V (2.5 V to 3.6 V) optimized for low cost, low power, small size, and ease of use. supplies. User-selectable options offer a combination of standby The product operates at a 100 MSPS conversion rate with modes, digital data formats, and digital data timing schemes. In outstanding dynamic performance over its full operating range. standby mode, the digital outputs are driven to a high Each channel can be operated independently. impedance state. The ADC requires only a single 3.0 V (2.7 V to 3.6 V) power Fabricated on an advanced CMOS process, the AD9288 is supply and an Encode clock for full-performance operation. No available in a 48-lead surface-mount plastic package (7 mm external reference or driver components are required for many 7 mm, 1.4 mm LQFP) specified over the industrial temperature applications. The digital outputs are TTL/CMOS-compatible, range (40C to +85C). The AD9288 is pin-compatible with and a separate output power supply pin supports interfacing the 10-bit AD9218, facilitating future system migrations. with 3.3 V or 2.5 V logic. Rev. C 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 rights of third parties that may result from its use. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Specifications subject to change without notice. No license is granted by implication Tel: 781.329.4700 www.analog.com or otherwise under any patent or patent rights of Analog Devices. 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OUTPUT REGISTER OUTPUT REGISTER 00585-001AD9288 TABLE OF CONTENTS Specifications..................................................................................... 3 Timing ......................................................................................... 14 Explanation of Test Levels........................................................... 4 User-Selectable Options ............................................................ 14 Timing Diagrams.......................................................................... 5 AD9218/AD9288 Customer PCB BOM...................................... 15 Absolute Maximum Ratings............................................................ 7 Evaluation Board ............................................................................ 16 ESD Caution.................................................................................. 7 Power Connector........................................................................ 16 Pin Configuration and Function Descriptions............................. 8 Analog Inputs ............................................................................. 16 Typical Performance Characteristics ............................................. 9 Voltage Reference ....................................................................... 16 Test Circuits..................................................................................... 12 Clocking....................................................................................... 16 Terminology .................................................................................... 13 Data Outputs............................................................................... 16 Theory of Operation ...................................................................... 14 Data Format/Gain ...................................................................... 16 Using the AD9288 ...................................................................... 14 Timing ......................................................................................... 16 Encode Input............................................................................... 14 Troubleshooting.......................................................................... 20 Digital Outputs ........................................................................... 14 Outline Dimensions ....................................................................... 21 Analog Input ............................................................................... 14 Ordering Guide .......................................................................... 21 Voltage Reference ....................................................................... 14 REVISION HISTORY 12/04Rev. B to Rev. C Change to Absolute Maximum Ratings......................................... 7 Replaced Evaluation Board Section ............................................. 16 Updated Outline Dimensions ....................................................... 21 Changes to Ordering Guide .......................................................... 21 2/02Rev. A to Rev. B Edits to ABSOLUTE MAXIMUM RATINGS .............................. 3 1/01Rev. 0 to Rev. A 2/99Revision 0: Initial Version Rev. C Page 2 of 24