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ADS1255IDBR-ADS1255IDBRG4-ADS1255IDBT-ADS1255IDBTG4
24 Bit, 30kSPS Very Low Noise Delta-Sigma ADC 20-SSOP -40 to 85
SBAS288K − JUNE 2003 − REVISED SEPTEMBER 2013
Very Low Noise, 24-Bit
Analog-to-Digital Converter
ADS1255
ADS1256
FEATURES 24 Bits, No Missing Codes − All Data Rates and PGA Settings Up to 23 Bits Noise-Free Resolution ±0.0010% Nonlinearity (max)
Data Output Rates to 30kSPS Fast Channel Cycling − 18.6 Bits Noise-Free (21.3 Effective Bits)at 1.45kHz One-Shot Conversions with Single-CycleSettling Flexible Input Multiplexer with Sensor Detect− Four Differential Inputs (ADS1256 only) − Eight Single-Ended Inputs (ADS1256 only) Chopper-Stabilized Input Buffer Low-Noise PGA: 27nV Input-Referred Noise Self and System Calibration for All PGASettings 5V Tolerant SPI™-Compatible Serial Interface Analog Supply: 5V Digital Supply: 1.8V to 3.6V Power Dissipation − As Low as 38mW in Normal Mode− 0.4mW in Standby Mode
APPLICATIONS Scientific Instrumentation Industrial Process Control Medical Equipment Test and Measurement Weigh Scales
DESCRIPTIONThe ADS1255 and ADS1256 are extremely low-noise,24-bit analog-to-digital (A/D) converters. They provide
complete high-resolution measurement solutions for themost 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 orsingle-ended signals and includes circuitry to verify the
integrity of the external sensor connected to the inputs.The selectable input buffer greatly increases the inputimpedance 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 datarate of up to 30k samples per second (SPS). The
converters offer fast channel cycling for measuringmultiplexed inputs and can also perform one-shot
conversions that settle in just a single cycle.
Communication is handled over an SPI-compatible serialinterface that can operate with a 2-wire connection.
Onboard calibration supports both self and systemcorrection of offset and gain errors for all the PGA settings.
Bidirectional digital I/Os and a programmable clock outputdriver are provided for general use. The ADS1255 is
packaged in an SSOP-20, and the ADS1256 in anSSOP-28.
XTAL2
Serial
Interface
Mux
and
Sensor
Detect
Programmable
DigitalFilter
4th−Order
Modulator
VREFP VREFN
ADSBuffer
AVDD DVDD
1:64
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AINCOM
XTAL1/CLKIN
RESET
DRDY
SCLK
DIN
SYNC/PDWN
DOUT
Control
General
Purpose
DigitalI/O
Clock
Generator
PGA
