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ADS1282IPWG4 Arkusz danych(PDF) 1 Page - Texas Instruments |
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ADS1282IPWG4 Arkusz danych(HTML) 1 Page - Texas Instruments |
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1 / 52 page  ADS1282 1 FEATURES DESCRIPTION APPLICATIONS 4th-Order DS Modulator Programmable DigitalFilter SPI Interface Calibration Control CLK AVDD AVSS DVDD DGND Over-Range ModulatorOutput ADS1282 DOUT DIN DRDY SCLK SYNC RESET PWDN 3 PGA Input1 Input2 VREFN VREFP V COM ADS1282 www.ti.com ................................................................................................................................................. SBAS418D – SEPTEMBER 2007 – REVISED JULY 2008 High-Resolution Analog-to-Digital Converter 2 • High Resolution: The ADS1282 is an extremely high-performance, 130dB SNR (250SPS, High-Resolution Mode) single-chip analog-to-digital converter (ADC) with an 127dB SNR (250SPS, Low-Power Mode) integrated, low-noise programmable gain amplifier (PGA) and two-channel input multiplexer (MUX). The • High Accuracy: ADS1282 is suitable for the demanding needs of THD: –122dB energy exploration and seismic monitoring INL: 0.5ppm environments. • Low-Noise PGA The converter uses a fourth-order, inherently stable, • Two-Channel Input MUX delta-sigma ( ΔΣ) modulator that provides outstanding • Inherently-Stable Modulator with Fast noise and linearity performance. The modulator is Responding Over-Range Detection used either in conjunction with the on-chip digital filter, or can be bypassed for use with post • Flexible Digital Filter: processing filters. Sinc + FIR + IIR (Selectable) Linear or Minimum Phase Response The flexible input MUX provides an additional Programmable High-Pass Filter external input for measurement, as well as internal self-test connections. The PGA features outstanding Selectable FIR Data Rates: 250SPS to 4kSPS low noise (5nV/ √Hz) and high input impedance, • Filter Bypass Option allowing easy interfacing to geophones and • Low Power Consumption: hydrophones over a wide range of gains. High-Resolution Mode: 25mW The digital filter provides selectable data rates from Low-Power Mode: 17mW 250 to 4000 samples per second (SPS). The Shutdown: 10 µW high-pass filter (HPF) features an adjustable corner • Offset and Gain Calibration Engine frequency. On-chip gain and offset scaling registers • SYNC Input support system calibration. • Analog Supply: The synchronization input (SYNC) can be used to Unipolar (+5V) or Bipolar (±2.5V) synchronize the conversions of multiple ADS1282s. The SYNC input also accepts a clock input for • Digital Supply: 1.8V to 3.3V continuous alignment of conversions from an external source. Two operating modes allow optimization of noise and • Energy Exploration power. Together, the amplifier, modulator, and filter • Seismic Monitoring dissipate 25mW and only 17mW in low-power mode. • High-Accuracy Instrumentation The ADS1282 is available in a compact TSSOP-28 package and is fully specified from –40°C to +85°C, with a maximum operating range to +125°C. 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 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2007–2008, 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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