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AD7641BCPZ Datasheet(PDF) 1 Page - Analog Devices |
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AD7641BCPZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 14 page 18-Bit 250/670 kSPS PulSAR® Bipolar Programmable Inputs ADC Preliminary Technical Data AD7631/AD7634 Rev. PrC 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 ©2006 Analog Devices, Inc. All rights reserved. FEATURES Multiple pins/software programmable input ranges: ±10V, ±5V, 10V, 5V iCMOS™ process technology Pins or serial SPI input ranges/mode selection Throughput: 670kSPS (AD7634) 250kSPS (AD7631) INL: ± 1.75 LSB (7± ppm of full scale) DNL: +2/-1 LSB 18-bit resolution with no missing codes Dynamic range: 102.5 dB typical SNR: 101 dB typical THD: -122 dB typical 5V internal reference: typical drift 7ppm/°C; TEMP output No pipeline delay (SAR architecture) Parallel (18, 16- or 8-bit bus) and serial 5 V/3.3 V interface SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible Power dissipation: 1 90 mW @ 670kSPS 75 mW @ 250kSPS Pb-free 48-lead LQFP and LFCSP (7x7mm) packages Pin compatible with other PulSAR ADCs APPLICATIONS Process control High speed data acquisition Digital signal processing Spectrum analysis Instrumentation Communications GENERAL DESCRIPTION The AD7631/AD7634 is an18-bit, charge redistribution successive approximation register (SAR) architecture analog-to- digital converter (ADC) with programmable input ranges and mode selection via a dedicated write only serial interface (or by hardware pin-strapping). The device is fabricated on ADI’s patented iCMOS high voltage process. The device contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), and both serial and parallel system interface ports. Power consumption is automatically scaled with throughput (AD7634 in Impulse mode), making it ideal for battery-powered applications. It is available in Pb-free, 48-lead packages with operation specified from −40°C to +85°C. FUNCTIONAL BLOCK DIAGRAM 18 CONTROL LOGIC AND CALIBRATION CIRCUITRY CLOCK AD7631/ AD7634 DGND DVDD AVDD AGND REF REFGND IN+ IN- PD RESET CNVST PDBUF REFBUFIN PDREF REF TEMP D[17:0] BUSY RD CS D0/OB/2C OGND OVDD REF AMP SERIAL DATA PORT PARALLEL INTERFACE SWITCHED CAP DAC VCC VEE WARP IMPULSE SERIAL PROGRAMMABLE PORT SPPDATA SPPCLK SPPEN HW/SW MODE0 MODE1 Figure 1. Table 1. PulSAR® Selection Type/kSPS 100 to 250 500 to 570 650 to 1000 >1000 Pseudo Differential AD7651, AD7660 AD7661 AD7650 AD7652 AD7664 AD7666 AD7653 AD7667 True Bipolar AD7610, AD7663 AD7665 AD7612, AD7671 True Differential AD7675 AD7676 AD7677 AD7621 AD7622 AD7623 18-Bit Multichannel/ AD7631 AD7678 AD7679 AD7634 AD7674 AD7641 AD7643 Simultaneous AD7654 AD7655 PRODUCT HIGHLIGHTS 1. Programmable input range and mode selection. Dedicated write only serial port used for selecting input range and mode select (mode select AD7634 only). 2. Fast throughput The AD7634 is 670kSPS and the AD7631 is 250kSPS. 3. Superior Linearity. No missing 18-bit code. +/- 1.75 LSB typical INL 4. Internal Reference. 5 V internal reference with a typical drift of ±7 ppm/°C and on-chip TEMP sensor. 5. Serial or Parallel Interface. Versatile parallel (18, 16- or 8-bit bus) or 2-wire serial interface arrangement compatible with 3.3 V, or 5 V logic. |
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