1 MSPS, Ultralow Power, 12-Bit ADC in 8-Lead LFCSP Data Sheet AD7091 FEATURES FUNCTIONAL BLOCK DIAGRAM V REGCAP DD Fast throughput rate of 1 MSPS Specified for V of 2.09 V to 5.25 V DD AD7091 INL of 1 LSB maximum Analog input range of 0 V to V DD SDO 12-BIT SERIAL V T/H SAR IN SCLK Ultralow power INTERFACE ADC CS 367 A typical at 3 V and 1 MSPS 324 nA typical at 3 V in power-down mode CLK Reference provided by V DD CONVERSION OSC CONTROL LOGIC Flexible power/throughput rate management CONVST High speed serial interface: SPI-/QSPI-/MICROWIRE-/ GND DSP-compatible Figure 1. Busy indicator 1100 Power-down mode V = 3V DD 8-lead, 2 mm 2 mm LFCSP package 1000 Temperature range: 40C to +125C 900 800 APPLICATIONS 700 Battery-powered systems 600 Handheld meters 500 Medical instruments 400 Mobile communications 300 Instrumentation and control systems 200 Data acquisition systems 100 Optical sensors Diagnostic/monitoring functions 0 0 200 400 600 800 1000 Energy harvesting THROUGHPUT RATE (kSPS) Figure 2. Power Dissipation vs. Throughput Rate GENERAL DESCRIPTION The AD7091 is a 12-bit successive approximation register The reference is derived internally from V . This design allows DD analog-to-digital converter (SAR ADC) that offers ultralow the widest dynamic input range to the ADC that is, the analog power consumption (typically 367 A at 3 V and 1 MSPS) while input range for the AD7091 is from 0 V to VDD. achieving fast throughput rates (1 MSPS with a 50 MHz SCLK). PRODUCT HIGHLIGHTS The AD7091 operates from a single 2.09 V to 5.25 V power 1. Lowest Power 12-Bit SAR ADC Available. supply. The AD7091 also features an on-chip conversion clock 2. High Throughput Rate with Ultralow Power Consumption. and a high speed serial interface. 3. Flexible Power/Throughput Rate Management. The conversion process and data acquisition are controlled using Average power scales with the throughput rate. Power-down CONVST a signal and an internal oscillator. The AD7091 has a mode allows the average power consumption to be reduced serial interface that allows data to be read after the conversion when the device is not performing a conversion. while achieving a 1 MSPS throughput rate. The AD7091 uses 4. Reference Derived from the Power Supply. advanced design and process techniques to achieve very low 5. Single-Supply Operation. power dissipation at high throughput rates. Rev. B 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 20122015 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 POWER (W) 10494-001 10494-002AD7091 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Circuit Information .................................................................... 10 Applications ....................................................................................... 1 Converter Operation .................................................................. 10 Functional Block Diagram .............................................................. 1 ADC Transfer Function ............................................................. 10 General Description ......................................................................... 1 Typical Connection Diagram ................................................... 11 Product Highlights ........................................................................... 1 Analog Input ............................................................................... 11 Revision History ............................................................................... 2 Modes of Operation ................................................................... 12 Specifications ..................................................................................... 3 Power Consumption .................................................................. 13 Timing Specifications .................................................................. 4 Multiplexer Applications ........................................................... 14 Absolute Maximum Ratings ............................................................ 5 Serial Interface ................................................................................ 15 Thermal Resistance ...................................................................... 5 Busy Indicator Enabled.............................................................. 15 ESD Caution .................................................................................. 5 Busy Indicator Disabled ............................................................ 16 Pin Configuration and Function Descriptions ............................. 6 Software Reset ............................................................................. 17 Typical Performance Characteristics ............................................. 7 Interfacing with an 8-/16-Bit SPI Bus ...................................... 17 Terminology ...................................................................................... 9 Outline Dimensions ....................................................................... 18 Theory of Operation ...................................................................... 10 Ordering Guide .......................................................................... 18 REVISION HISTORY 3/15Rev. A to Rev. B Changes to Typical Connection Diagram Section ...................... 11 Changes to Busy Indicator Enabled Section ................................ 15 6/13Rev. 0 to Rev. A Changes to Figure 22 ...................................................................... 13 Added Multiplexer Applications Section .................................... 14 Updated Outline Dimensions ....................................................... 18 10/12Revision 0: Initial Version Rev. B Page 2 of 20