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ADS1256IDBR Datasheet(PDF) 1 Page - Texas Instruments

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Part # ADS1256IDBR
Description  Very Low Noise, 24-Bit Analog-to-Digital Converter
Download  45 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ADS1256IDBR Datasheet(HTML) 1 Page - Texas Instruments

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SBAS288K − JUNE 2003 − REVISED SEPTEMBER 2013
Very Low Noise, 24-Bit
Analog-to-Digital 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 Scientific Instrumentation
D Industrial Process Control
D Medical Equipment
D Test and Measurement
D Weigh Scales
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
(ΔΣ) 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.
SPI is a trademark of Motorola, Inc. All other 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 © 2003−2013, 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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