True Bipolar Input, Dual 12-Bit/14-Bit, 2-Channel, Simultaneous Sampling SAR ADC AD7366/AD7367 FEATURES FUNCTIONAL BLOCK DIAGRAM V D A AV DV DD CAP CC CC Dual 12-bit/14-bit, 2-channel ADC True bipolar analog inputs REF BUF Programmable input ranges: AD7366/AD7367 10 V, 5 V, 0 V to 10 V 12 V with 3 V external reference V A1 Throughput rate: 1 MSPS 12-/14-BIT SUCCESSIVE OUTPUT MUX T/H D A OUT Simultaneous conversion with read in less than 1 s APPROXIMATION DRIVERS ADC High analog input impedance V A2 SCLK Low current consumption: CNVST 8.3 mA typical in normal mode CS BUSY CONTROL 320 nA typical in shutdown mode LOGIC ADDR AD7366 RANGE0 RANGE1 72 dB SNR at 50 kHz input frequency REFSEL 12-bit no missing codes V B1 V DRIVE AD7367 76 dB SNR at 50 kHz input frequency MUX T/H 12-/14-BIT SUCCESSIVE OUTPUT D B 14-bit no missing codes OUT APPROXIMATION DRIVERS ADC Accurate on-chip reference: 2.5 V 0.2% V B2 BUF 40C to +85C operation High speed serial interface Compatible with SPI, QSPI, MICROWIRE, and DSP AGND AGND V D B DGND SS CAP iCMOS process technology Figure 1. Available in a 24-lead TSSOP GENERAL DESCRIPTION PRODUCT HIGHLIGHTS 1 The AD7366/AD7367 are dual 12-bit/14-bit, high speed, low 1. The AD7366/AD7367 can accept true bipolar analog input power, successive approximation analog-to-digital converters signals, as well as 10 V, 5 V, 12 V (with external refer- (ADCs) that feature throughput rates up to 1 MSPS. The device ence), and 0 V to 10 V unipolar signals. contains two ADCs, each preceded by a 2-channel multiplexer, 2. Two complete ADC functions allow simultaneous sampling and a low noise, wide bandwidth track-and-hold amplifier. and conversion of two channels. 3. 1 MSPS serial interface: SPI-/QSPI-/DSP-/MICROWIRE- The AD7366/AD7367 are fabricated on the Analog Devices, Inc., 2 compatible interface. industrial CMOS process (iCMOS ), which is a technology platform combining the advantages of low and high voltage Table 1. Related Products CMOS. The iCMOS process allows the AD7366/AD7367 to Throughput Number of accept high voltage bipolar signals in addition to reducing Device Resolution Rate Channels power consumption and package size. The AD7366/AD7367 AD7366 12-Bit 1 MSPS Dual, 2-channel can accept true bipolar analog input signals in the 10 V range, AD7366-5 12-Bit 500 kSPS Dual, 2-channel 5 V range, and 0 V to 10 V range. AD7367 14-Bit 1 MSPS Dual, 2-channel AD7367-5 14-Bit 500 kSPS Dual, 2-channel The AD7366/AD7367 have an on-chip 2.5 V reference that can be disabled to allow the use of an external reference. 1 Protected by U.S. Patent No. 6,731,232. If a 3 V reference is applied to the D A and D B pins, the 2 CAP CAP iCMOS Process Technology. For analog systems designers within industrial/instrumentation equipment OEMs who need high performance AD7366/AD7367 can accept a true bipolar 12 V analog input. ICs at higher voltage levels, iCMOS is a technology platform that enables the Minimum 12 V V and V supplies are required for the DD SS development of analog ICs capable of 30 V and operating at 15 V supplies 12 V input range. while allowing dramatic reductions in power consumption and package size, and increased ac and dc performance. Rev. D 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. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 2007-2010 Analog Devices, Inc. All rights reserved. 06703-001AD7366/AD7367 TABLE OF CONTENTS Features .............................................................................................. 1 Typical Connection Diagram ................................................... 18 Functional Block Diagram .............................................................. 1 Driver Amplifier Choice ........................................................... 19 General Description ......................................................................... 1 Reference ..................................................................................... 19 Product Highlights ........................................................................... 1 Modes of Operation ....................................................................... 20 Revision History ............................................................................... 2 Normal Mode .............................................................................. 20 Specifications ..................................................................................... 3 Shutdown Mode ......................................................................... 21 Timing Specifications .................................................................. 7 Power-Up Times ......................................................................... 21 Absolute Maximum Ratings ............................................................ 8 Serial Interface ................................................................................ 22 ESD Caution .................................................................................. 8 Microprocessor Interfacing ........................................................... 24 Pin Configuration and Function Descriptions ............................. 9 AD7366/AD7367 to ADSP-218x .............................................. 24 Typical Performance Characteristics ........................................... 11 AD7366/AD7367 to ADSP-BF53x ........................................... 24 Terminology .................................................................................... 14 AD7366/AD7367 to TMS320VC5506 ..................................... 25 Theory of Operation ...................................................................... 16 AD7366/AD7367 to DSP563xx ................................................ 25 Circuit Information .................................................................... 16 Application Hints ........................................................................... 27 Converter Operation .................................................................. 16 Layout and Grounding .............................................................. 27 Analog Inputs .............................................................................. 16 Outline Dimensions ....................................................................... 28 Transfer Function ....................................................................... 17 Ordering Guide .......................................................................... 28 REVISION HISTORY 11/10Rev. C to Rev. D Changes to D A and D B Description in Table 6 ................. 9 OUT OUT Changes to Serial Interface Section .............................................. 22 Changes to Figure 27 ...................................................................... 23 10/10Rev. B to Rev. C Changes to D A and D B Description in Table 6 ................. 9 OUT OUT Changes to Serial Interface Section .............................................. 22 Changes to Figure 27 ...................................................................... 23 8/09Rev. A to Rev. B Changes to Table 2 ............................................................................ 4 Changes to Table 3 ............................................................................ 6 9/07Rev. 0 to Rev. A Changes to Title ............................................................................... 1 Changes to Specifications ................................................................ 3 Changes to Figure 5 ........................................................................ 11 Changes to Terminology Section.................................................. 14 Changes to Figure 20 ...................................................................... 18 Changes to Figure 28 ...................................................................... 23 Updated Outline Dimensions ....................................................... 28 Changes to Ordering Guide .......................................................... 28 5/07Revision 0: Initial Version Rev. D Page 2 of 28