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ADS1240 Arkusz danych(PDF) 1 Page - Texas Instruments |
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ADS1240 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 23 page 24-Bit ANALOG-TO-DIGITAL CONVERTER FEATURES q 24 BITS NO MISSING CODES q SIMULTANEOUS 50Hz AND 60Hz REJECTION (–90dB MINIMUM) q 0.0015% INL q 21 BITS EFFECTIVE RESOLUTION (PGA = 1), 19 BITS (PGA = 128) q PGA GAINS FROM 1 TO 128 q SINGLE CYCLE SETTLING q PROGRAMMABLE DATA OUTPUT RATES q EXTERNAL DIFFERENTIAL REFERENCE OF 0.1V TO 5V q ON-CHIP CALIBRATION q SPI™ COMPATIBLE q 2.7V TO 5.25V SUPPLY RANGE q 600 µW POWER CONSUMPTION q UP TO EIGHT INPUT CHANNELS q UP TO EIGHT DATA I/O DESCRIPTION The ADS1240 and ADS1241 are precision, wide dynamic range, delta-sigma, Analog-to-Digital (A/D) converters with 24-bit resolution operating from 2.7V to 5.25V power supplies. The delta-sigma A/D converter provides up to 24 bits of no missing code performance and effective resolution of 21 bits. The input channels are multiplexed. Internal buffering can be selected to provide very high input impedance for direct connection to transducers or low-level voltage signals. Burnout current sources are provided that allow for detection of an open or shorted sensor. An 8-bit Digital-to-Analog (D/A) converter provides an offset cor- rection with a range of 50% of the Full-Scale Range (FSR). The Programmable Gain Amplifier (PGA) 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 modu- lator and programmable Finite-Impulse Response (FIR) filter that provides a simultaneous 50Hz and 60Hz notch. The reference input is differential and can be used for ratiometric conversion. The serial interface is SPI compatible. Up to eight bits of data I/O are also provided that can be used for input or output. The ADS1240 and ADS1241 are designed for high-resolution measure- ment applications in smart transmitters, industrial process control, weigh scales, chromatography, and portable instrumentation. APPLICATIONS q INDUSTRIAL PROCESS CONTROL q WEIGH SCALES q LIQUID /GAS CHROMATOGRAPHY q BLOOD ANALYSIS q SMART TRANSMITTERS q PORTABLE INSTRUMENTATION BUF PGA A = 1:128 + Clock Generator Serial Interface 2nd-Order Modulator AGND AV DD V REF+ VREF– X IN X OUT DSYNC PDWN RESET DRDY BUFEN DGND DV DD SCLK POL D IN D OUT CS MUX A IN0/D0 A IN1/D1 A IN2/D2 A IN3/D3 A IN4/D4 A IN5/D5 A IN6/D6 A IN7/D7 A INCOM Controller Registers Digital Filter 2 µA AV DD Offset DAC AGND 2 µA ADS1241 Only ADS1 241 ADS1 240 ADS1240 ADS1241 SBAS173C – JUNE 2001 – REVISED NOVEMBER 2003 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 © 2001-2003, 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 property of their respective owners. |
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