ADS1255

ADS1255 ADS1256 SBAS288K − JUNE 2003 − REVISED SEPTEMBER 2013 Very Low Noise, 24-Bit Analog-to-Digital Converter FEATURES DESCRIPTION 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 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...