1 MSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC Data Sheet AD7329 FEATURES FUNCTIONAL BLOCK DIAGRAM MUX +MUX ADC ADC + V REF /REF V OUT OUT IN IN DD IN OUT CC 12-bit plus sign SAR ADC True bipolar input ranges 2.5V VREF Software-selectable input ranges V 0 IN V 1 IN 10 V, 5 V, 2.5 V, 0 V to +10 V V 2 IN 13-BIT SUCCESSIVE 1 MSPS throughput rate I/P V 3 APPROXIMATION IN T/H MUX ADC V 4 8 analog input channels with channel sequencer IN V 5 IN Single-ended true differential and pseudo differential V 6 IN analog input capability V 7 IN DOUT High analog input impedance CONTROL SCLK LOGIC AND CHANNEL MUX and ADC pins allow separate access to mux and ADC CS OUT IN REGISTERS SEQUENCER DIN Low power: 21 mW AD7329 Temperature indicator V AGND V SS DRIVE Full power signal bandwidth: 20 MHz Figure 1. Internal 2.5 V reference High speed serial interface iCMOS process technology 24-lead TSSOP package Power-down modes GENERAL DESCRIPTION PRODUCT HIGHLIGHTS 1 The AD7329 is an 8-channel, 12-bit plus sign successive 1. The AD7329 can accept true bipolar analog input signals, approximation ADC designed on the iCMOS (industrial 10 V, 5 V, 2.5 V, and 0 V to +10 V unipolar signals. CMOS) process. iCMOS is a process combining high voltage 2. The eight analog inputs can be configured as eight single- CMOS and low voltage CMOS. It enables the development of ended inputs, four true differential input pairs, four pseudo a wide range of high performance analog ICs capable of 33 V differential inputs, or seven pseudo differential inputs. operation in a footprint that no previous generation of high 3. 1 MSPS serial interface. SPI-/QSPI-/DSP-/MICROWIRE- voltage parts could achieve. Unlike analog ICs using conventional compatible interface. CMOS processes, iCMOS components can accept bipolar input 4. Low power, 21 mW, at 1 MSPS. signals while providing increased performance, dramatically 5. The MUX and ADC pins allow for signal conditioning OUT IN reduced power consumption, and reduced package size. of the mux output prior to entering the ADC. The AD7329 can accept true bipolar analog input signals. The Table 1. Similar Devices AD7329 has four software-selectable input ranges: 10 V, 5 V, Device 2.5 V, and 0 V to +10 V. Each analog input channel can be Number Throughput Rate Number of Channels independently programmed to one of the four input ranges. AD7328 1000 kSPS 8 The analog input channels on the AD7329 can be programmed AD7327 500 kSPS 8 to be single-ended, true differential, or pseudo differential. AD7324 1000 kSPS 4 The ADC contains a 2.5 V internal reference. The AD7329 also AD7323 500 kSPS 4 AD7322 1000 kSPS 2 allows for external reference operation. If a 3 V reference is AD7321 500 kSPS 2 applied to the REFIN/REFOUT pin, the AD7329 can accept a true bipolar 12 V analog input. The ADC has a high speed serial interface that can operate at throughput rates up to 1 MSPS. 1 Protected by U.S. Patent No. 6,731,232. Rev. C 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 20062014 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 05402-001AD7329 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Addressing Registers .................................................................. 25 Functional Block Diagram .............................................................. 1 Control Register ......................................................................... 26 General Description ......................................................................... 1 Sequence Register ....................................................................... 28 Product Highlights ........................................................................... 1 Range Registers ........................................................................... 28 Revision History ............................................................................... 2 Sequencer Operation ..................................................................... 29 Specif icat ions ..................................................................................... 3 Reference ..................................................................................... 31 Timing Specifications .................................................................. 7 V ............................................................................................ 31 DRIVE Absolute Maximum Ratings ............................................................ 8 Temperature Indicator ............................................................... 31 ESD Caution .................................................................................. 8 Modes of Operation ....................................................................... 32 Pin Configuration and Function Descriptions ............................. 9 Normal Mode (PM1 = PM0 = 0) ............................................. 32 Typical Performance Characteristics ........................................... 11 Full Shutdown Mode (PM1 = PM0 = 1) ................................. 32 Terminology .................................................................................... 15 Autoshutdown Mode (PM1 = 1, PM0 = 0) ............................. 33 Theory of Operation ...................................................................... 17 Autostandby Mode (PM1 = 0, PM0 =1) ................................. 33 Circuit Information .................................................................... 17 Power vs. Throughput Rate ....................................................... 34 Converter Operation .................................................................. 17 Serial Interface ................................................................................ 35 Output Coding ............................................................................ 18 Microprocessor Interfacing ........................................................... 36 Transfer Functions...................................................................... 18 AD7329 to ADSP-21xx .............................................................. 36 Analog Input Structure .............................................................. 18 AD7329 to ADSP-BF53x ........................................................... 36 Track-and-Hold Section ............................................................ 19 Applications Information .............................................................. 37 Typical Connection Diagram ................................................... 20 Layout and Grounding .............................................................. 37 Analog Input ............................................................................... 20 Power Supply Configuration .................................................... 37 Driver Amplifier Choice ............................................................ 23 Outline Dimensions ....................................................................... 38 Registers ........................................................................................... 25 Ordering Guide .......................................................................... 38 REVISION HISTORY 12/14Rev. B to Rev. C 2/10Rev. 0 to Rev. A Change to Specifications Section .................................................... 3 Changes to DC Accuracy Parameter, Test Conditions/ Change to Timing Specifications Section ...................................... 7 Comments, Table 2 ............................................................................ 4 Changes to Table 5 .......................................................................... 10 Change to Normal Mode (Operational) ICC and IDRIVE Changes to Pseudo Differential Inputs Section .......................... 22 Parameter and to Power Dissipation Normal Mode Parameter, Table 2 ............................................................................. 6 1/14Rev. A to Rev. B Changes to Table 16 and Table 17 ................................................ 36 Changes to Circuit Information Section and Table 6 ................ 17 Added Applications Information Section, Figure 60, Changes to Addressing Registers Section .................................... 25 and Table 18 .................................................................................... 37 Changes to Power Supply Configuration Section ...................... 37 Changes to Ordering Guide .......................................................... 38 Changes to Ordering Guide .......................................................... 38 4/06Revision 0: Initial Version Rev. C Page 2 of 38