ADS1256IDBR

• 24-Bit resolution, Eight Analog Input channels, One Converter Core
• Sampling and Conversion Rate Up to 30 Ksps
• SPI and Two-Wire Serial interfaces, Bipolar Input Polarity
• Separate Analog and Digital supplies, 1.8 V to 5.25 V range, 5 V Nominal
• Power Dissipation 38 mW typical, 57 mW maximum, DNL 2 LSB
• 28-Pin SSOP, 10.2 Mm X 5.3 Mm X 2 mm, -40 C to 85 C

The ADS1256IDBR is a 24-bit delta-sigma analog-to-digital converter from Texas Instruments with eight analog input channels, supplied in a 28-pin SSOP. It converts at up to 30 ksps over an SPI or two-wire serial interface and operates from a 1.8 V to 5.25 V supply with 5 V nominal operation and separate analog and digital supply rails. Splitting the supplies lets the converter run its analog section from a clean rail while the digital interface follows the host logic level, which is a standard arrangement for 24-bit measurement devices. Power dissipation is 38 mW typical against a 57 mW maximum, and differential nonlinearity is 2 LSB.

Eight-channel 24-bit converters are specified for precision measurement systems: multi-channel strain and pressure acquisition, weigh scales, chromatography and laboratory instruments, seismic and vibration recording, and process-control transmitters. The combination of high resolution with a 30 ksps ceiling suits applications that need small-signal accuracy rather than wide bandwidth. Buyers are test and measurement, scientific instrument and process-automation OEMs. Note that the catalogue record also carries a Number of Converters value of 4 that contradicts the single A/D converter recorded on the same row, and a 36 mA nominal supply current that is inconsistent with the recorded 36 mW power consumption at 5 V; both have been excluded here and flagged for correction.