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 converter's input impedance, reducing power supply noise and common-mode noise. The ADS1256 also includes an optional low-noise gain amplifier (PGA) that increases the signal range, reduces noise, and further improves the converter's dynamic range.
The document provides a comprehensive technical overview of the Texas Instruments ADS1255 and ADS1256 devices. These are extremely low-noise, 24-bit analog-to-digital (A/D) converters designed for complete high-resolution measurement solutions in demanding applications such as medical equipment, scientific instrumentation, and industrial process control.
The datasheet details the device features, including a 4th-order delta-sigma modulator, flexible input multiplexers with sensor detect circuitry, and chopper-stabilized input buffers. It specifies electrical characteristics for both devices across various operating conditions, pin assignments for SSOP packages, and ordering information.
| Resolution | 24 Bit |
|---|---|
| No missing codes | All data rates and PGA settings |
| Integral nonlinearity | +/-40.0007 %FSR |
| Analog Supply Voltage (AVDD) | 4.75 to 5.25 V |
| Digital Supply Voltage (DVDD) | 1.8 to 3.6 V |
| Operating Temperature Range | -40 to +105 °C |
The converters offer up to 23 bits noise-free resolution.
Data output rates can go up to 30k samples per second (SPS).
The maximum junction temperature rating is +150 °C.