14-Bit, 80 MSPS/105 MSPS A/D Converter Data Sheet AD6645 provides CMOS-compatible digital outputs. It is the fourth FEATURES generation in a wideband ADC family, preceded by the AD9042 SNR = 75 dB, f 15 MHz, up to 105 MSPS IN (12-bit, 41 MSPS), the AD6640 (12-bit, 65 MSPS, IF sampling), SNR = 72 dB, f 200 MHz, up to 105 MSPS IN and the AD6644 (14-bit, 40 MSPS/65 MSPS). SFDR = 89 dBc, f 70 MHz, up to 105 MSPS IN 100 dBFS multitone SFDR Designed for multichannel, multimode receivers, the AD6645 is IF sampling to 200 MHz part of the Analog Devices, Inc., SoftCell transceiver chipset. Sampling jitter: 0.1 ps The AD6645 maintains 100 dB multitone, spurious-free dynamic 1.5 W power dissipation range (SFDR) through the second Nyquist band. This breakthrough Differential analog inputs performance eases the burden placed on multimode digital Pin compatible to AD6644 receivers (software radios) that are typically limited by the ADC. Twos complement digital output format Noise performance is exceptional typical signal-to-noise ratio 3.3 V CMOS compatible (SNR) is 74.5 dB through the first Nyquist band. Data-ready for output latching The AD6645 is built on the Analog Devices extra fast complementary bipolar (XFCB) process and uses an innovative, APPLICATIONS multipass circuit architecture. Units are available in a 52-lead Multichannel, multimode receivers exposed pad (TQFP EP) package specified from 40C to Base station infrastructures +85C at 80 MSPS and 10C to +85C at 105 MSPS. AMPS, IS-136, CDMA, GSM, W-CDMA PRODUCT HIGHLIGHTS Single channel digital receivers Antenna array processing 1. IF Sampling. The AD6645 maintains outstanding ac Communications instrumentation performance up to input frequencies of 200 MHz, suitable Radars, infrared imaging for multicarrier 3G wideband cellular IF sampling receivers. Instrumentation 2. Pin Compatibility. The ADC has the same footprint and pin layout as the AD6644 14-bit, 40 MSPS/65 MSPS ADC. GENERAL DESCRIPTION 3. SFDR Performance and Oversampling. Multitone SFDR The AD6645 is a high speed, high performance, monolithic 14-bit performance of 100 dBFS can reduce the requirements of analog-to-digital converter (ADC). All necessary functions, high end RF components. including track-and-hold (T/H) and reference, are included on the chip to provide a complete conversion solution. The AD6645 FUNCTIONAL BLOCK DIAGRAM AV DV CC CC AD6645 AIN A1 TH1 TH2 A2 TH3 TH4 TH5 ADC3 AIN 6 ADC1 DAC1 ADC2 DAC2 VREF 2.4V 5 5 ENCODE INTERNAL DIGITAL ERROR CORRECTION LOGIC TIMING ENCODE GND DMID OVR DRY D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 MSB LSB Figure 1. Rev. E 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 20022017 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 02647-001AD6645 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Explanation of Test Levels ............................................................7 Applications ....................................................................................... 1 ESD Caution...................................................................................7 General Description ......................................................................... 1 Pin Configuration and Function Descriptions ..............................8 Product Highlights ........................................................................... 1 Typical Performance Characteristics ..............................................9 Functional Block Diagram .............................................................. 1 Equivalent Circuits ......................................................................... 14 Revision History ............................................................................... 2 Terminology .................................................................................... 15 Specifications ..................................................................................... 3 Theory of Operation ...................................................................... 17 DC Specifications ......................................................................... 3 Applying the AD6645 ................................................................ 17 Digital Specifications ................................................................... 4 Layout Information ........................................................................ 19 AC Specifications .......................................................................... 4 Jitter Considerations .................................................................. 19 Switching Specifications .............................................................. 5 Outline Dimensions ....................................................................... 24 Absolute Maximum Ratings ............................................................ 7 Ordering Guide .......................................................................... 24 Thermal Resistance ...................................................................... 7 REVISION HISTORY 9/2017Rev. D to Rev. E 7/2003Rev. A to Rev. B. Changes to General Description and Product Highlights .......... 1 Changes to Title ................................................................................ 1 Changes to Operating Temperature Parameter, Table 5 .............. 7 Changes to Features .......................................................................... 1 Changes to Table 6 ............................................................................ 7 Changes to Product Description ..................................................... 1 Changes to Specifications ................................................................. 3 Changes to Ordering Guide .......................................................... 24 Changes to Absolute Maximum Ratings ........................................ 7 10/2008Rev. C to Rev. D Changes to Ordering Guide .......................................................... 24 Added TQFP EP Package ............................................ Throughout Updated Outline Dimensions ....................................................... 20 Renamed Thermal Characteristics Section Thermal Resistance Section ................................................................................................ 7 6/2002Rev. 0 to Rev. A. Added Table 6 Renumbered Sequentially .................................... 7 Change to DC Specifications ........................................................... 3 Moved Equivalent Circuits Section .............................................. 14 Moved Terminology Section ......................................................... 15 Changes to Table 9 .......................................................................... 20 Updated Outline Dimensions ....................................................... 24 Changes to Ordering Guide .......................................................... 24 12/2006Rev. B to Rev. C Updated Format .................................................................. Universal Changes to Specifications ................................................................ 3 Changes to Jitter Considerations Section .................................... 19 Changes to Table 8, Bill of Materials ............................................ 20 Changes to Figure 43, Evaluation Board Schematic .................. 21 Changes to Figure 44 and Figure 46 ............................................. 22 Updated Outline Dimensions ....................................................... 23 Changes to Ordering Guide .......................................................... 23 Rev. E Page 2 of 24