The DADS1256 is a high-precision data converter chip with an integrated ultra-low noise 24-bit analog-to-digital (A/D) converter. It provides a complete high-resolution measurement solution for the most demanding applications. The A/D converter consists of a 4th-order ΔΣ modulator and a programmable digital filter. Optional input buffers significantly improve input impedance, and a low-noise programmable gain amplifier (PGA) provides gain from 1 to 64 in binary steps. The programmable filter allows users to optimize between noise-free resolution up to 22 bits and data rates up to 16 kSPS. These converters provide fast channel cycling for multiplexed inputs and can also perform single conversions, built up within a single cycle.

Communication is handled via an SPI-compatible serial interface, which can be used with a two-wire connection. On-chip calibration supports self-calibration and system calibration of offset and gain errors for all PGA settings. A general-purpose programmable clock output driver is provided. The DADS1256 is packaged in an SSOP28 package.

• 24-bit, no missing codes.
• Up to 22-bit noise-free resolution.
• 0.002% nonlinearity.
• Data output rate 16KSPS.
• Fast Track Loop.
• Single-cycle single conversion.
• Flexible input multiplexer:
•         4-channel differential input.
•         8-channel single-ended input.
• Low-noise PGA: Noise referred to the input is 30nV.
• Chopper-stabilized input buffer.
• Supports self-calibration and system calibration of all PGAs.
• SPI-compatible serial interface.
• Analog supply: 5V, Digital supply: 1.8-3.3V.
• Power dissipation:
•         As low as 45mW in normal mode.
•         0.45mW in standby mode.

• Industrial process control.
• Scientific instruments.
• medical equipment.
• Test equipment.
• Weighing scale.