True Bipolar Input, 12-/14-Bit, 2-Channel, Simultaneous Sampling SAR ADCs AD7366-5/AD7367-5 FEATURES FUNCTIONAL BLOCK DIAGRAM V D A AV DV Dual 12-bit/14-bit, 2-channel ADCs DD CAP CC CC True bipolar analog inputs Programmable input ranges REF BUF AD7366-5/AD7367-5 10 V, 5 V, 0 V to +10 V 12 V with +3 V external reference V A1 Throughput rate: 500 kSPS 12-/14-BIT SUCCESSIVE OUTPUT Simultaneous conversion with read in less than 2 s MUX T/H D A OUT APPROXIMATION DRIVERS ADC High analog input impedance V A2 Low current consumption SCLK CNVST 5.1 mA typical in normal mode CS 320 nA typical in shutdown mode CONTROL BUSY LOGIC ADDR AD7366-5 RANGE0 72 dB SNR at 50 kHz input frequency RANGE1 REFSEL 12-bit no missing codes V B1 V DRIVE AD7367-5 76 dB SNR at 50 kHz input frequency MUX T/H 12-/14-BIT SUCCESSIVE OUTPUT 14-bit no missing codes D B OUT APPROXIMATION DRIVERS ADC Accurate on-chip reference: 2.5 V 0.2% V B2 40C to +85C operation BUF High speed serial interface SPI-/QSPI-/MICROWIRE-/DSP-compatible AGND AGND V D B DGND SS CAP iCMOS process technology Figure 1. Available in a 24-lead TSSOP GENERAL DESCRIPTION The devices have an on-chip 2.5 V reference that can be disabled to 1 allow the use of an external reference. If a 3 V reference is applied The AD7366-5/AD7367-5 are dual, 12-/14-bit, low power, to the DCAPA and DCAPB pins, the AD7366-5/AD7367-5 can successive approximation analog-to-digital converters (ADCs) accept a true bipolar 12 V analog input. Minimum 12 V VDD that feature throughput rates up to 500 kSPS. Each device contains and VSS supplies are required for the 12 V input range. two ADCs, which are both preceded by a 2-channel multiplexer, and a low noise, wide bandwidth, track-and-hold amplifier. PRODUCT HIGHLIGHTS The AD7366-5/AD7367-5 are fabricated on the Analog 1. True bipolar analog input signals can be accepted, as well 2 Devices, Inc., industrial CMOS process (iCMOS) , which is as 10 V, 5 V, 12 V (with external reference), and 0 V to a technology platform combining the advantages of low and +10 V unipolar signals. high voltage CMOS. The process allows the parts to accept 2. Two complete ADC functions allow simultaneous high voltage bipolar signals in addition to reducing power sampling and conversion of two channels. consumption and package size. The AD7366-5/AD7367-5 can accept true bipolar analog input signals in the 10 V range, 3. A 500 kSPS serial interface is SPI-/QSPI-/MICROWIRE-/ 5 V range, and 0 V to +10 V range. DSP-compatible. Table 1. Related Products Device Resolution Throughput Rate No. of Channels AD7366 12-Bit 1 MSPS Dual, 2-channel 1 Protected by U.S. Patent No. 6,731,232. 2 AD7366-5 12-Bit 500 kSPS Dual, 2-channel For analog systems designers within industrial/instrumentation equipment OEMs who need high performance ICs at higher voltage levels, iCMOS is a AD7367 14-Bit 1 MSPS Dual, 2-channel technology platform that enables the development of analog ICs capable of AD7367-5 14-Bit 500 kSPS Dual, 2-channel +30 V and operating at 15 V supplies while allowing dramatic reductions in power consumption and package size, and increased ac and dc performance. Rev. B 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. 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Trademarks and registered trademarks are the property of their respective owners. 06842-001AD7366-5/AD7367-5 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 AD7366-5 Specifications ............................................................. 3 Power-Up Times......................................................................... 21 AD7367-5 Specifications ............................................................. 5 Serial Interface ................................................................................ 22 Timing Specifications .................................................................. 7 Microprocessor Interfacing........................................................... 24 Absolute Maximum Ratings............................................................ 8 AD7366-5/AD7367-5 to ADSP-218x ...................................... 24 ESD Caution.................................................................................. 8 AD7366-5/AD7367-5 to ADSP-BF53x ................................... 25 Pin Configuration and Function Descriptions............................. 9 AD7366-5/AD7367-5 to TMS320VC5506 ............................. 25 Typical Performance Characteristics ........................................... 11 AD7366-5/AD7367-5 to DSP563xx......................................... 26 Terminology .................................................................................... 14 Application Hints ........................................................................... 27 Theory of Operation ...................................................................... 16 Layout and Grounding .............................................................. 27 Circuit Information.................................................................... 16 Evaluating the AD7366-5/AD7367-5 ...................................... 27 Converter Operation.................................................................. 16 Outline Dimensions....................................................................... 28 Analog Inputs.............................................................................. 17 Ordering Guide .......................................................................... 28 Transfer Function ....................................................................... 17 REVISION HISTORY 7/11Rev. A to Rev. B Changes to Serial Interface Section.............................................. 22 Changes to Figure 27...................................................................... 23 8/09Rev. 0 to Rev. A Changes to Table 2............................................................................ 4 Changes to Table 3............................................................................ 6 7/07Revision 0: Initial Version Rev. B Page 2 of 28