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ADS1278-SP Scheda tecnica(PDF) 1 Page - Texas Instruments |
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ADS1278-SP Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 57 page ADS1278-SP 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 MODE[1:0] Eight Digital Filters Product Folder Order Now Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. ADVANCE INFORMATION for pre-production products; subject to change without notice. ADS1278-SP SBAS937 – SEPTEMBER 2018 ADS1278-SP Radiation Hardened 8-Ch Simultaneous-Sampling 24-Bit Analog-to-Digital Converter 1 1 Features 1 • Radiation Hardened – TID 75 krad(Si) – TID Radiation Lot Acceptance Test (RLAT) TBD – Single Event Latchup (SEL) Immune to LET 68 MeV-cm2/mg @ 125°C • Simultaneously Samples Eight Channels • Up to 128-kSPS Data Rate • AC Performance: – 63-kHz Bandwidth – 111-dB SNR (High-Resolution Mode) – –108-dB THD • DC Accuracy: – 0.8-μV/°C Offset Drift – 1.3-ppm/°C Gain Drift • Selectable Operating Modes: – High-Speed: 128 kSPS, 106-dB SNR – High-Resolution: 52 kSPS, 111-dB SNR – Low-Power: 52 kSPS, 31 mW/ch – Low-Speed: 10 kSPS, 7 mW/ch • Linear Phase Digital Filter • SPI™ or Frame-Sync Serial Interface • Low Sampling Aperture Error • Modulator Output Option (Digital Filter Bypass) • Analog Supply: 5 V • Digital Core: 1.8 V • I/O Supply: 1.8 V to 3.3 V 2 Applications • Space Systems (Satellite, Shuttles, Stations) – Satellite Temperature and Position Sensing – Orbital Observation Systems – Precision and Scientific Applications – High-Accuracy Instrumentation 3 Description The ADS1278-SP (octal) is a 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with data rates up to 128k samples per second (SPS), allowing simultaneous sampling of eight channels. Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop. As a result, they have limited signal bandwidth and are mostly suited for dc measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the offset and drift specifications are significantly weaker than respective industrial counterparts. The ADS1278-SP combines these types of converters, allowing high-precision industrial measurement with excellent dc and ac specifications. The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and signal out-of-band noise. These ADCs provide a usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005 dB of ripple. Device Information(1) PART NUMBER GRADE PACKAGE ADS1278MHFQ-MLS Flight Grade 75 krad(Si); –55°C to 125°C 84-Pin HFQ ADS1278WHFQ-MLS Flight Grade 75 krad(Si); –55°C to 115°C ADS1278HFQ/EM Engineering Samples(2) ADS1278EVM-CVAL Ceramic Evaluation Board EVM (1) For all available packages, see the orderable addendum at the end of the data sheet. (2) These units are intended for engineering evaluation only. They are processed to a noncompliant flow. These units are not suitable for qualification, production, radiation testing or flight use. Parts are not warranted for performance over the full MIL specified temperature range of –55°C to 125°C or operating life. Simplified Schematic |
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