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
