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ADS1256IDBR Datasheet(PDF) 1 Page - Burr-Brown (TI) |
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ADS1256IDBR Datasheet(HTML) 1 Page - Burr-Brown (TI) |
1 / 39 page SBAS288D − JUNE 2003 − REVISED AUGUST 2004 Very Low Noise, 24Bit AnalogtoDigital Converter ADS1255 ADS1256 FEATURES D 24 Bits, No Missing Codes − All Data Rates and PGA Settings D Up to 23 Bits Noise-Free Resolution D ±0.0010% Nonlinearity (max) D Data Output Rates to 30kSPS D Fast Channel Cycling − 18.6 Bits Noise-Free (21.3 Effective Bits) at 1.45kHz D One-Shot Conversions with Single-Cycle Settling D Flexible Input Multiplexer with Sensor Detect − Four Differential Inputs (ADS1256 only) − Eight Single-Ended Inputs (ADS1256 only) D Chopper-Stabilized Input Buffer D Low-Noise PGA: 27nV Input-Referred Noise D Self and System Calibration for All PGA Settings D 5V Tolerant SPI-Compatible Serial Interface D Analog Supply: 5V D Digital Supply: 1.8V to 3.6V D Power Dissipation − As Low as 38mW in Normal Mode − 0.4mW in Standby Mode APPLICATIONS D Weigh Scales D Scientific Instrumentation D Industrial Process Control D Medical Equipment D Test and Measurement DESCRIPTION The ADS1255 and ADS1256 are extremely low-noise, 24-bit analog-to-digital (A/D) converters. They provide complete high-resolution measurement solutions for the most demanding applications. The converter is comprised of a 4th-order, delta-sigma ( ∆Σ) modulator followed by a programmable digital filter. A flexible input multiplexer handles differential or single-ended signals and includes circuitry to verify the integrity of the external sensor connected to the inputs. The selectable input buffer greatly increases the input impedance and the low-noise programmable gain amplifier (PGA) provides gains from 1 to 64 in binary steps. The programmable filter allows the user to optimize between a resolution of up to 23 bits noise-free and a data rate of up to 30k samples per second (SPS). The converters offer fast channel cycling for measuring multiplexed inputs and can also perform one-shot conversions that settle in just a single cycle. Communication is handled over an SPI-compatible serial interface that can operate with a 2-wire connection. Onboard calibration supports both self and system correction of offset and gain errors for all the PGA settings. Bidirectional digital I/Os and a programmable clock output driver are provided for general use. The ADS1255 is packaged in an SSOP-20, and the ADS1256 in an SSOP-28. All trademarks are the property of their respective owners. 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. www.ti.com Copyright 2003−2004, 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. XTAL2 Serial Interface Mux and Sensor Detect Programmable Digital Filter 4th−Order Modulator VREFP VREFN ADS1256 Only Buffer AVDD DVDD 1:64 DGND D3 D2 D1 D0/CLKOUT AGND AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AINCOM XTAL1/CLKIN RESET DRDY SCLK DIN SYNC/PDWN CS DOUT Control General Purpose Digital I/O Clock Generator PGA |
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