14-Bit, 40 MSPS/65 MSPS A/D Converter AD9244 FEATURES FUNCTIONAL BLOCK DIAGRAM AVDD REFT REFB DRVDD 14-bit, 40 MSPS/65 MSPS ADC Low power AD9244 550 mW at 65 MSPS VIN+ DFS 300 mW at 40 MSPS 14 10-STAGE SHA PIPELINE ADC On-chip reference and sample-and-hold VIN 750 MHz analog input bandwidth SNR > 73 dBc to Nyquist 65 MSPS CLK+ OTR SFDR > 86 dBc to Nyquist 65 MSPS OUTPUT CLK TIMING REGISTER Differential nonlinearity error = 0.7 LSB Guaranteed no missing codes over full temperature range DCS 1 V to 2 V p-p differential full-scale analog input range 14 Single 5 V analog supply, 3.3 V/5 V driver supply D13 TO D0 Out-of-range indicator REFERENCE OEB Straight binary or twos complement output data Clock duty cycle stabilizer Output-enable function AGND CML VR VREF SENSE REF DGND GND 48-lead LQFP package Figure 1. APPLICATIONS Fabricated on an advanced CMOS process, the AD9244 is Communication subsystems (microcell, picocell) available in a 48-lead LQFP and is specified for operation over Medical and high-end imaging equipment the industrial temperature range (40C to +85C). Test and measurement equipment PRODUCT HIGHLIGHTS 1. Low PowerThe AD9244, at 550 mW, consumes a fraction GENERAL DESCRIPTION of the power of currently available ADCs in existing high speed solutions. The AD9244 is a monolithic, single 5 V supply, 14-bit, 40 MSPS/65 MSPS ADC with an on-chip, high performance 2. IF SamplingThe AD9244 delivers outstanding sample-and-hold amplifier (SHA) and voltage reference. performance at input frequencies beyond the first Nyquist zone. Sampling at 65 MSPS with an input frequency of The AD9244 uses a multistage differential pipelined architec- 100 MHz, the AD9244 delivers 71 dB SNR and 86 dB SFDR. ture with output error correction logic to provide 14-bit 3. Pin CompatibilityThe AD9244 offers a seamless accuracy at 40 MSPS/65 MSPS data rates, and guarantees no migration from the 12-bit, 65 MSPS AD9226. missing codes over the full operating temperature range. 4. On-Board Sample-and-Hold (SHA)The versatile SHA input can be configured for either single-ended or The AD9244 has an on-board, programmable voltage reference. differential inputs. An external reference can also be used to suit the dc accuracy 5. Out-of-Range (OTR) IndicatorThe OTR output bit and temperature drift requirements of the application. indicates when the input signal is beyond the AD9244s A differential or single-ended clock input controls all internal input range. conversion cycles. The digital output data can be presented in 6. Single SupplyThe AD9244 uses a single 5 V power straight binary or in twos complement format. An out-of-range supply, simplifying system power supply design. It also (OTR) signal indicates an overflow condition that can be used features a separate digital output driver supply to with the most significant bit to determine low or high overflow. accommodate 3.3 V and 5 V logic families. 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 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 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 02404-001AD9244 TABLE OF CONTENTS Features .............................................................................................. 1 Terminology.......................................................................................9 Functional Block Diagram .............................................................. 1 Typical Application Circuits ......................................................... 11 Applications....................................................................................... 1 Typical Performance Characteristics ........................................... 12 General Description ......................................................................... 1 Theory of Operation ...................................................................... 17 Product Highlights ........................................................................... 1 Analog Input and Reference Overview ................................... 17 Revision History ............................................................................... 2 Analog Input Operation............................................................ 18 Specifications..................................................................................... 3 Reference Operation .................................................................. 20 DC Specifications ......................................................................... 3 Digital Inputs and Outputs ....................................................... 21 AC Specifications.......................................................................... 4 Evaluation Board ............................................................................ 26 Digital Specifications ................................................................... 5 Analog Input Configuration ..................................................... 26 Switching Specifications .............................................................. 6 Reference Configuration ........................................................... 26 Absolute Maximum Ratings............................................................ 7 Clock Configuration .................................................................. 26 Explanation of Test Levels........................................................... 7 Outline Dimensions ....................................................................... 36 ESD Caution.................................................................................. 7 Ordering Guide .......................................................................... 36 Pin Configuration and Function Descriptions............................. 8 REVISION HISTORY 12/05Rev. B to Rev. C 2/05Rev. A to Rev. B Updated Format..................................................................Universal Updated Format..................................................................Universal Changes to Figure 45...................................................................... 19 Changes to Table 1.............................................................................3 Added Single-Ended Input Configuration Section.................... 19 Changes to Table 2.............................................................................4 Added Reference Decoupling Section ......................................... 25 Reformatted Table 5 ..........................................................................7 Changes to Figure 65...................................................................... 28 Changes to Table 6.............................................................................8 Changes to Figure 66...................................................................... 29 Changes to Figure 12...................................................................... 12 Changes to Figure 67...................................................................... 30 Changed Captions on Figure 18 and Figure 21.......................... 13 Added Table 15 ............................................................................... 34 Changes to Figure 35, Figure 38, Figure 39................................. 16 Changes to Table 9.......................................................................... 18 Changes to Table 13 ....................................................................... 26 Changes to Ordering Guide .......................................................... 36 6/03Rev. 0 to Rev. A Changes to AC Specifications..........................................................3 Updated Ordering Guide .................................................................6 Updated Outline Dimensions....................................................... 33 6/02Revision 0: Initial Version Rev. C Page 2 of 36