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AD7631BCPZRL Datasheet(PDF) 1 Page - Analog Devices |
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AD7631BCPZRL Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page 18-Bit, 250 kSPS, Differential Programmable Input PulSAR® ADC AD7631 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2007–2011 Analog Devices, Inc. All rights reserved. FEATURES Multiple pins/software-programmable input ranges +5 V (10 V p-p), +10 V (20 V p-p), ±5 V (20 V p-p), ±10 V (40 V p-p) Pins or serial SPI-compatible input ranges/mode selection Throughput: 250 kSPS INL: ±1.5 LSB typical, ±2.5 LSB maximum (±9.5 ppm of FSR) 18-bit resolution with no missing codes Dynamic range: 102.5 dB SNR: 101 dB @ 2 kHz THD: −112 dB @ 2 kHz iCMOS® process technology 5 V internal reference: typical drift 3 ppm/°C; TEMP output No pipeline delay (SAR architecture) Parallel (18-/16-/8-bit bus) and serial 5 V/3.3 V interface SPI-/QSPI™-/MICROWIRE™-/DSP-compatible Power dissipation 73 mW @ 250 kSPS 10 mW @ 1 kSPS Pb-free, 48-lead LQFP and 48-lead LFCSP (7 mm × 7 mm) APPLICATIONS Process controls High speed data acquisition Digital signal processing Spectrum analysis ATE GENERAL DESCRIPTION The AD7631 is an 18-bit, charge redistribution, successive approximation register (SAR), architecture analog-to-digital converter (ADC) fabricated on Analog Devices, Inc.’s iCMOS high voltage process. The device is configured through hardware or via a dedicated write-only serial configuration port for input range and operating mode. The AD7631 contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and both serial and parallel system interface ports. A falling edge on CNVST samples the fully differential analog inputs on IN+ and IN−. The AD7631 features four different analog input ranges. Power is scaled linearly with throughput. Operation is specified from −40°C to +85°C. FUNCTIONAL BLOCK DIAGRAM 18 CONTROL LOGIC AND CALIBRATION CIRCUITRY CLOCK AD7631 DGND DVDD AVDD AGND REF REFGND IN+ PD RESET CNVST PDBUF REFBUFIN PDREF REF TEMP D[17:0] BUSY RD CS D0/OB/2C OGND OVDD D2/A1 D1/A0 REF AMP SERIAL DATA PORT PARALLEL INTERFACE SWITCHED CAP DAC VCC VEE BIPOLAR TEN SERIAL CONFIGURATION PORT IN– MODE0 MODE1 Figure 1. Table 1. 48-Lead PulSAR Selection Input Type Res (Bits) 100 to 250 (kSPS) 500 to 570 (kSPS) 570 to 1000 (kSPS) >1000 (kSPS) Bipolar 14 AD7951 Differential Bipolar 14 AD7952 Unipolar 16 AD7651 AD7650 AD7653 AD7660 AD7652 AD7667 AD7661 AD7664 AD7666 Bipolar 16 AD7610 AD7665 AD7612 AD7663 AD7671 Differential 16 AD7675 AD7676 AD7677 AD7621 Unipolar AD7622 AD7623 Simultaneous/ 16 AD7654 Multichannel Unipolar AD7655 Differential 18 AD7678 AD7679 AD7674 AD7641 Unipolar AD7643 Differential Bipolar 18 AD7631 AD7634 |
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