High-Resolution ADC (Rev. G) - Texas Instruments Semiconductor - #1

Text version of the page

4th-Order DS Modulator Programmable Digital Filter SPI Interface Calibration Control CLK AVDD AVSS DVDD DGND Over-Range Modulator Output ADS1282 DOUT DIN DRDY SCLK SYNC RESET 3 PWDN PGA MUX Input 1 Input 2 VREFN VREFP VCOM ADS1282 www.ti.com SBAS418G –SEPTEMBER 2007–REVISED MAY 2010 High-Resolution Analog-to-Digital Converter Check for Samples: ADS1282 1FEATURES DESCRIPTION 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 • High Accuracy: (PGA) and two-channel input multiplexer (MUX). The THD: –122dB ADS1282 is suitable for the demanding needs of INL: 0.5ppm energy exploration and seismic monitoring environments. • Low-Noise PGA • Two-Channel Input MUX The converter uses a fourth-order, inherently stable, delta-sigma (ÄÓ) 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 • Flexible Digital Filter: filter, or can be bypassed for use with post Sinc + FIR + IIR (Selectable) processing filters. Linear or Minimum Phase Response The flexible input MUX provides an additional Programmable High-Pass Filter external input for measurement, as well as internal Selectable FIR Data Rates: 250SPS to 4kSPS self-test connections. The PGA features outstanding • Filter Bypass Option low noise (5nV/�ãHz) and high input impedance, allowing easy interfacing to geophones and • Low Power Consumption: hydrophones over a wide range of gains. High-Resolution Mode: 25mW Low-Power Mode: 17mW The digital filter provides selectable data rates from Shutdown: 10mW 250 to 4000 samples per second (SPS). The 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. • Digital Supply: 1.8V to 3.3V The SYNC input also accepts a clock input for continuous alignment of conversions from an external APPLICATIONS source. • Energy Exploration Two operating modes allow optimization of noise and • Seismic Monitoring power. Together, the amplifier, modulator, and filter • High-Accuracy Instrumentation dissipate 25mW and only 17mW in low-power mode. 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. 2All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2007–2010, 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.