3 mW, 100 kSPS, 16-Bit ADC in 6-Lead SOT-23 AD7680 FEATURES FUNCTIONAL BLOCK DIAGRAM Fast throughput rate: 100 kSPS V DD Specified for VDD of 2.5 V to 5.5 V Low power 16-BIT SUCCESSIVE 3 mW typ at 100 kSPS with 2.5 V supply V T/H APPROXIMATION IN ADC 3.9 mW typ at 100 kSPS with 3 V supply 16.7 mW typ at 100 kSPS with 5 V supply SCLK Wide input bandwidth CONTROL AD7680 SDATA LOGIC 86 dB SNR at 10 kHz input frequency CS Flexible power/serial clock speed management No pipeline delays GND High speed serial interface Figure 1. SPI/QSPI/Wire/DSP compatible Standby mode: 0.5 A max 6-Lead SOT-23 and 8-Lead MSOP packages Table 1. MSOP/SOT-23 16-Bit PulSAR ADC APPLICATIONS Type/kSPS 100 kSPS 250 kSPS 500 kSPS Battery-powered systems: True Differential AD7684 AD7687 AD7688 Pseudo Differential AD7683 AD7685 AD7686 Personal digital assistants Unipolar AD7680 Medical instruments Mobile communications Instrumentation and control systems Remote data acquisition systems High speed modems Optical sensors GENERAL DESCRIPTION PRODUCT HIGHLIGHTS 1. First 16-bit ADC in a SOT-23 package. The AD7680 is a 16-bit, fast, low power, successive approximation ADC. The part operates from a single 2.5 V to 2. High throughput with low power consumption. 5.5 V power supply and features throughput rates up to 100 kSPS. 3. Flexible power/serial clock speed management. The The part contains a low noise, wide bandwidth track-and-hold conversion rate is determined by the serial clock, allowing amplifier that can handle input frequencies in excess of 7 MHz. the conversion time to be reduced through the serial clock The conversion process and data acquisition are controlled speed increase. This allows the average power consumption CS using and the serial clock, allowing the devices to interface to be reduced when a power-down mode is used while not with microprocessors or DSPs. The input signal is sampled on converting. The part also features a shutdown mode to CS the falling edge of and the conversion is also initiated at this maximize power efficiency at lower throughput rates. point. There are no pipeline delays associated with the part. Power consumption is 0.5 A max when in shutdown. 4. Reference derived from the power supply. The AD7680 uses advanced design techniques to achieve very low power dissipation at fast throughput rates. The reference for 5. No pipeline delays. the part is taken internally from VDD, which allows the widest dynamic input range to the ADC. Thus, the analog input range This part features a standard successive approximation ADC for this part is 0 V to V . The conversion rate is determined by CS DD with accurate control of the sampling instant via a input and the SCLK frequency. once-off conversion control. Rev. A 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. Trademarks and registered trademarks are the property of their respective owners. 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All rights reserved. 03643-0-001AD7680 TABLE OF CONTENTS Specif icat ions ..................................................................................... 2 Typical Connection Diagram ................................................... 13 Specif icat ions ..................................................................................... 4 Digital Inputs .......................................................................... 13 Timing Specifications ....................................................................... 6 Modes of Operation ....................................................................... 14 Absolute Maximum Ratings ............................................................ 7 Normal Mode .............................................................................. 14 ESD Caution .................................................................................. 7 Power-Down Mode .................................................................... 15 Pin Configurations and Function Descriptions ........................... 8 Power vs. Throughput Rate ........................................................... 16 Terminology ...................................................................................... 9 Serial Interface ................................................................................ 17 Typical Performance Characteristics ........................................... 10 AD7680 to ADSP-218x .............................................................. 18 Circuit Information ........................................................................ 12 Application Hints ........................................................................... 19 Converter Operation .................................................................. 12 Grounding and Layout .............................................................. 19 Analog Input ............................................................................... 12 Outline Dimensions ....................................................................... 20 ADC Transfer Function ................................................................. 13 Ordering Guide .......................................................................... 21 REVISION HISTORY 5/11Rev. 0 to Rev. A Deleted the Evaluating the AD7680 Performance Section ...... 19 Changes to Ordering Guide .......................................................... 21 1/04Revision 0: Initial Version Rev. A Page 2 of 24