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AD7634BSTZ 데이터시트(PDF) 1 Page - Analog Devices |
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1 / 32 page 18-Bit, 670 kSPS, Differential Programmable Input PulSAR® ADC Data Sheet AD7634 Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother 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 ©2007–2012 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com 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 670 kSPS (warp mode) 570 kSPS (normal mode) 450 kSPS (impulse mode) 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 @ 2kHz 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 180 mW @ 670 kSPS, warp mode 28 mW @ 100 kSPS, impulse mode 10 mW @ 1 kSPS, impulse mode Pb-free, 48-lead LQFP and 48-Lead LFCSP (7 mm × 7 mm) APPLICATIONS CT scanners High dynamic data acquisition Σ-Δ replacement Spectrum analysis Medical instruments Instrumentation Process controls GENERAL DESCRIPTION The AD7634 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 AD7634 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 AD7634 features four different analog input ranges and three different sampling modes. Operation is specified from −40°C to +85°C. FUNCTIONAL BLOCK DIAGRAM 18 CONTROL LOGIC AND CALIBRATION CIRCUITRY CLOCK AD7634 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 WARP IMPULSE 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 AD7660 AD7661 AD7650 AD7652 AD7664 AD7666 AD7653 AD7667 Bipolar 16 AD7610 AD7663 AD7665 AD7612 AD7671 Differential Unipolar 16 AD7675 AD7676 AD7677 AD7621 AD7622 AD7623 Simultaneous/ Multichannel Unipolar 16 AD7654 AD7655 Differential Unipolar 18 AD7678 AD7679 AD7674 AD7641 AD7643 Differential Bipolar 18 AD7631 AD7634 |
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