1.6 V, Micropower 12-/10-/8-Bit ADCs AD7466/AD7467/AD7468 FEATURES FUNCTIONAL BLOCK DIAGRAM V DD Specified for V of 1.6 V to 3.6 V DD Low power: 0.62 mW typical at 100 kSPS with 3 V supplies 12-/10-/8-BIT SUCCESSIVE 0.48 mW typical at 50 kSPS with 3.6 V supplies V T/H IN APPROXIMATION ADC 0.12 mW typical at 100 kSPS with 1.6 V supplies Fast throughput rate: 200 kSPS Wide input bandwidth: SCLK 71 dB SNR at 30 kHz input frequency CONTROL SDATA Flexible power/serial clock speed management LOGIC CS No pipeline delays High speed serial interface: AD7466/AD7467/AD7468 SPI/QSPI/MICROWIRE/DSP compatible GND Automatic power-down Power-down mode: 8 nA typical Figure 1. 6-lead SOT-23 package 8-lead MSOP package APPLICATIONS Battery-powered systems Medical instruments Remote data acquisition Isolated data acquisition GENERAL DESCRIPTION PRODUCT HIGHLIGHTS 1 The AD7466/AD7467/AD7468 are 12-/10-/8-bit, high speed, 1. Specified for supply voltages of 1.6 V to 3.6 V. low power, successive approximation analog-to-digital 2. 12-, 10-, and 8-bit ADCs in SOT-23 and MSOP packages. converters (ADCs), respectively. The parts operate from a single 3. High throughput rate with low power consumption. 1.6 V to 3.6 V power supply and feature throughput rates up to Power consumption in normal mode of operation at 200 kSPS with low power dissipation. The parts contain a low 100 kSPS and 3 V is 0.9 mW maximum. noise, wide bandwidth track-and-hold amplifier, which can handle input frequencies in excess of 3 MHz. 4. Flexible power/serial clock speed management. The conversion rate is determined by the serial clock, The conversion process and data acquisition are controlled allowing the conversion time to be reduced through using CS and the serial clock, allowing the devices to interface increases in the serial clock speed. Automatic power-down with microprocessors or DSPs. The input signal is sampled on after conversion allows the average power consumption to the falling edge of CS, and the conversion is also initiated at this be reduced when in power-down. Current consumption is point. There are no pipeline delays associated with the part. 0.1 A maximum and 8 nA typically when in power-down. The reference for the part is taken internally from V . This DD 5. Reference derived from the power supply. allows the widest dynamic input range to the ADC. Thus, the 6. No pipeline delay. analog input range for the part is 0 V to V . The conversion DD rate is determined by the SCLK. 7. The part features a standard successive approximation ADC with accurate control of conversions via a CS input. 1 Protected by U.S. Patent No. 6,681,332. 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 20032007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 02643-001AD7466/AD7467/AD7468 TABLE OF CONTENTS Features .............................................................................................. 1 Power Requirement Curves ...................................................... 13 Applications....................................................................................... 1 Terminology.................................................................................... 16 Functional Block Diagram .............................................................. 1 Theory of Operation ...................................................................... 17 General Description ......................................................................... 1 Circuit Information.................................................................... 17 Product Highlights ........................................................................... 1 Converter Operation.................................................................. 17 Revision History ............................................................................... 2 ADC Transfer Function............................................................. 17 Specifications..................................................................................... 3 Typical Connection Diagram ................................................... 17 AD7466.......................................................................................... 3 Analog Input ............................................................................... 18 AD7467.......................................................................................... 5 Digital Inputs .............................................................................. 18 AD7468.......................................................................................... 7 Normal Mode.............................................................................. 19 Timing Specifications .................................................................. 9 Power Consumption .................................................................. 20 Timing Examples........................................................................ 10 Serial Interface ................................................................................ 22 Absolute Maximum Ratings.......................................................... 11 Microprocessor Interfacing....................................................... 23 ESD Caution................................................................................ 11 Application Hints ........................................................................... 25 Pin Configurations and Function Descriptions ......................... 12 Grounding and Layout .............................................................. 25 Typical Performance Characteristics ........................................... 13 Evaluating the Performance of the AD7466 and AD7467.... 25 Dynamic Performance Curves ................................................. 13 Outline Dimensions....................................................................... 26 DC Accuracy Curves ................................................................. 13 Ordering Guide .......................................................................... 27 REVISION HISTORY 5/07Rev. B to Rev. C Deleted Figure 3.............................................................................. 10 Updated Outline Dimensions ....................................................... 26 Changes to Ordering Guide .......................................................... 27 4/05Rev. A to Rev. B Moved Terminology Section......................................................... 16 Changes to Ordering Guide .......................................................... 27 11/04Rev. 0 to Rev. A Updated Format..................................................................Universal Changes to General Description .................................................... 1 Added Patent Number ..................................................................... 1 Updated Outline Dimensions ....................................................... 26 Changes to Ordering Guide .......................................................... 27 5/03Revision 0: Initial Version Rev. C Page 2 of 28