ADS1255IDB

ADS1255IDB

DESCRIPON

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