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ADS1278 Datasheet(PDF) 1 Page - Texas Instruments |
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ADS1278 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 52 page  VREFP VREFN AVDD DVDD TEST[1:0] FORMAT[2:0] CLK SYNC PWDN[8:1] CLKDIV Control Logic SPI and Frame- Sync Interface IOVDD DGND AGND DRDY/FSYNC SCLK DOUT[8:1] DIN Input2 Input1 Input4 Input3 Input6 Input5 Input8 Input7 DS DS DS DS DS DS DS DS PWDN[4:1] ADS1278 Four Digital Filters AVDD DVDD TEST[1:0] FORMAT[2:0] CLK SYNC CLKDIV Control Logic SPI and Frame- Sync Interface IOVDD DGND AGND DRDY/FSYNC SCLK DOUT[4:1] DIN ADS1274 MODE[1:0] MODE[1:0] Eight Digital Filters VREFP VREFN Input2 Input1 Input4 Input3 DS DS DS DS ADS1274 ADS1278 www.ti.com SBAS367F – JUNE 2007 – REVISED FEBRUARY 2011 Quad/Octal, Simultaneous Sampling, 24-Bit Analog-to-Digital Converters Check for Samples: ADS1274, ADS1278 1 FEATURES DESCRIPTION 234 • Simultaneously Measure Four/Eight Channels Based on the single-channel ADS1271, the ADS1274 (quad) and ADS1278 (octal) are 24-bit, delta-sigma • Up to 144kSPS Data Rate ( ΔΣ) analog-to-digital converters (ADCs) with data • AC Performance: rates up to 144k samples per second (SPS), allowing 70kHz Bandwidth simultaneous sampling of four or eight channels. The 111dB SNR (High-Resolution Mode) devices are offered in identical packages, permitting –108dB THD drop-in expandability. • DC Accuracy: Traditionally, industrial delta-sigma ADCs offering 0.8 μV/°C Offset Drift good drift performance use digital filters with large 1.3ppm/ °C Gain Drift passband droop. As a result, they have limited signal • Selectable Operating Modes: bandwidth and are mostly suited for dc High-Speed: 144kSPS, 106dB SNR measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the High-Resolution: 52kSPS, 111dB SNR offset and drift specifications are significantly weaker Low-Power: 52kSPS, 31mW/ch than respective industrial counterparts. The ADS1274 Low-Speed: 10kSPS, 7mW/ch and ADS1278 combine these types of converters, • Linear Phase Digital Filter allowing high-precision industrial measurement with • SPI ™ or Frame-Sync Serial Interface excellent dc and ac specifications. • Low Sampling Aperture Error The high-order, chopper-stabilized modulator • Modulator Output Option (digital filter bypass) achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and • Analog Supply: 5V signal out-of-band noise. These ADCs provide a • Digital Core: 1.8V usable signal bandwidth up to 90% of the Nyquist • I/O Supply: 1.8V to 3.3V rate with less than 0.005dB of ripple. Four operating modes allow for optimization of speed, APPLICATIONS resolution, and power. All operations are controlled • Vibration/Modal Analysis directly by pins; there are no registers to program. • Multi-Channel Data Acquisition The devices are fully specified over the extended industrial range ( –40°C to +105°C) and are available • Acoustics/Dynamic Strain Gauges in an HTQFP-64 PowerPAD ™ package. • Pressure Sensors 1 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. 2 PowerPAD is a trademark of Texas Instruments, Inc. 3 SPI is a trademark of Motorola, Inc. 4 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. © 2007–2011, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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