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ADS1217IPFBR bảng dữ liệu(PDF) 1 Page - Texas Instruments |
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ADS1217IPFBR bảng dữ liệu(HTML) 1 Page - Texas Instruments |
1 / 33 page ADS1 217 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER FEATURES q 24 BITS NO MISSING CODES q INL: 0.0012% of FSR (max) q FULL-SCALE INPUT: ±2V REF q PGA FROM 1 TO 128 q 22 BITS EFFECTIVE RESOLUTION (PGA = 1), 19 BITS (PGA = 128) q SINGLE CYCLE SETTLING MODE q PROGRAMMABLE DATA OUTPUT RATES UP TO 1kHz q ON-CHIP 1.25V/2.5V REFERENCE q ON-CHIP CALIBRATION q SPI COMPATIBLE q POWER SUPPLY: 2.7V to 5.25V q < 1mW POWER CONSUMPTION, V DD = 3V DESCRIPTION The ADS1217 is a precision, wide dynamic range, delta- sigma, Analog-to-Digital (A/D) converter with 24-bit resolu- tion operating from 2.7V to 5.25V supplies. The delta-sigma, A/D converter provides up to 24 bits of no missing code performance and effective resolution of 22 bits. The eight input channels are multiplexed. Internal buffering can be selected to provide a very high input impedance for direct connection to transducers or low-level voltage signals. Burnout current sources are provided that allow for the detection of an open or shorted sensor. An 8-bit Digital-to- Analog Converter (DAC) provides an offset correction with a range of 50% of the FSR (Full-Scale Range). The PGA (Programmable Gain Amplifier) provides selectable gains of 1 to 128 with an effective resolution of 19 bits at a gain of 128. The A/D conversion is accomplished with a 2nd-order, delta-sigma modulator and programmable sinc filter. The reference input is differential and can be used for ratiometric measurements. The onboard current DACs operate indepen- dently with the maximum current set by an external resistor. The serial interface is SPI compatible. Eight bits of digital I/O are also provided that can be used for input or output. The ADS1217 is designed for high-resolution measurement appli- cations in smart transmitters, industrial process control, weigh scales, chromatography, and portable instrumentation. APPLICATIONS q INDUSTRIAL PROCESS CONTROL q LIQUID/GAS CHROMATOGRAPHY q BLOOD ANALYSIS q SMART TRANSMITTERS q PORTABLE INSTRUMENTATION q WEIGH SCALES q PRESSURE TRANSDUCERS BUF PGA + Voltage Reference Clock Generator Registers Serial Interface 2nd-Order Modulator RAM Digital I/O Interface AGND AV DD R DAC V REFOUT V RCAP V REF+ VREF– X IN X OUT D7 BUFEN ... D0 DGND DV DD D IN SCLK POL D OUT CS DRDY PDWN DYSNC RESET MUX A IN0 A IN1 A IN2 A IN3 A IN4 A IN5 A IN6 A IN7 A INCOM IDAC1 Controller Program- mable Digital Filter 8-Bit IDAC IDAC2 8-Bit IDAC Offset DAC ADS1217 SBAS260C – MAY 2002 – REVISED FEBRUARY 2007 www.ti.com PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2002-2007, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. |
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