AD7631BSTZ Analog Devices

18-Bit, 250 kSPS, Differential Programmable Input PulSAR ADC Data Sheet AD7631 FEATURES FUNCTIONAL BLOCK DIAGRAM TEMP REFBUFIN REF REFGND VCC VEE DVDD DGND Multiple pins/software-programmable input ranges +5 V (10 V p-p), +10 V (20 V p-p), 5 V (20 V p-p), OVDD AGND AD7631 10 V (40 V p-p) REF OGND AVDD AMP SERIAL DATA Pins or serial SPI-compatible input ranges/mode selection REF PDREF PORT Throughput: 250 kSPS SERIAL PDBUF CONFIGURATION INL: 1.5 LSB typical, 2.5 LSB maximum (9.5 ppm of FSR) PORT 18 IN+ SWITCHED D 17:0 CAP DAC 18-bit resolution with no missing codes IN BUSY Dynamic range: 102.5 dB RD SNR: 101 dB 2 kHz PARALLEL CS CLOCK INTERFACE CNVST THD: 112 dB 2 kHz D0/OB/2C PD CONTROL LOGIC AND iCMOS process technology D1/A0 CALIBRATION CIRCUITRY RESET 5 V internal reference: typical drift 3 ppm/C TEMP output D2/A1 No pipeline delay (SAR architecture) Parallel (18-/16-/8-bit bus) and serial 5 V/3.3 V interface BIPOLAR TEN MODE0 MODE1 SPI-/QSPI-/MICROWIRE-/DSP-compatible Figure 1. Power dissipation Table 1. 48-Lead PulSAR Selection 73 mW 250 kSPS 100 to 500 to 570 to 10 mW 1 kSPS Res 250 570 1000 >1000 Pb-free, 48-lead LQFP and 48-lead LFCSP (7 mm 7 mm) Input Type (Bits) (kSPS) (kSPS) (kSPS) (kSPS) Bipolar 14 AD7951 APPLICATIONS Differential 14 AD7952 Process controls Bipolar High speed data acquisition Unipolar 16 AD7651 AD7650 AD7653 Digital signal processing AD7660 AD7652 AD7667 Spectrum analysis AD7661 AD7664 ATE AD7666 GENERAL DESCRIPTION Bipolar 16 AD7610 AD7665 AD7612 AD7663 AD7671 The AD7631 is an 18-bit, charge redistribution, successive Differential 16 AD7675 AD7676 AD7677 AD7621 approximation register (SAR), architecture analog-to-digital Unipolar AD7622 converter (ADC) fabricated on Analog Devices, Inc.s iCMOS AD7623 high voltage process. The device is configured through hardware Simultaneous/ 16 AD7654 or via a dedicated write-only serial configuration port for input Multichannel AD7655 range and operating mode. The AD7631 contains a high speed Unipolar 18-bit sampling ADC, an internal conversion clock, an internal Differential 18 AD7678 AD7679 AD7674 AD7641 reference (and buffer), error correction circuits, and both serial Unipolar AD7643 and parallel system interface ports. A falling edge on CNVST Differential 18 AD7631 AD7634 samples the fully differential analog inputs on IN+ and IN. Bipolar The AD7631 features four different analog input ranges. Power is scaled linearly with throughput. Operation is specified from 40C to +85C. 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 20072012 Analog Devices, Inc. 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Technical Support www.analog.com 06588-001AD7631 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Driver Amplifier Choice ........................................................... 20 Applications ....................................................................................... 1 Voltage Reference Input/Output .............................................. 21 General Description ......................................................................... 1 Power Supplies ............................................................................ 22 Functional Block Diagram .............................................................. 1 Conversion Control ................................................................... 23 Revision History ............................................................................... 2 Interfaces.......................................................................................... 24 Specif icat ions ..................................................................................... 3 Digital Interface .......................................................................... 24 Timing Specifications .................................................................. 5 Parallel Interface ......................................................................... 24 Absolute Maximum Ratings ............................................................ 7 Serial Interface ............................................................................ 25 ESD Caution .................................................................................. 7 Master Serial Interface ............................................................... 25 Pin Configuration and Function Descriptions ............................. 8 Slave Serial Interface .................................................................. 26 Typical Performance Characteristics ........................................... 12 Hardware Configuration ........................................................... 29 Terminology .................................................................................... 16 Software Configuration ............................................................. 29 Theory of Operation ...................................................................... 17 Microprocessor Interfacing ....................................................... 30 O ver vie w ...................................................................................... 17 Application Information ................................................................ 31 Converter Operation .................................................................. 17 Layout Guidelines....................................................................... 31 Transfer Functions...................................................................... 18 Evaluating Performance ............................................................ 31 Typical Connection Diagram ................................................... 18 Outline Dimensions ....................................................................... 32 Analog Inputs .............................................................................. 19 Ordering Guide .......................................................................... 32 REVISION HISTORY 12/12Rev. A to Rev. B Changes to Power Sequencing Section ........................................ 23 Updated Outline Dimensions ....................................................... 32 Changes to Ordering Guide .......................................................... 32 3/11Rev. 0 to Rev. A Changes to Resolution Parameter, Table 2 .................................... 3 Changes to Figure 4 and Table 6 ..................................................... 8 Added Exposed Pad Notation to Outline Dimensions ............. 32 2/07Revision 0: Initial Version Rev. B Page 2 of 32