●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.
●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-Cycle Settling
●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 PGA Settings
●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
●Weigh Scales
●Scientific Instrumentation
●Industrial Process Control
●Medical Equipment
●Test and Measurement
