ADI integrates 24-bit ADC into sensor interface chip

Analog Devices has integrated 24-bit sigma-delta converters into analogue front end devices with up to eight differential inputs.

The AD7124-4 and AD7124-8 are integrated signal chain devices with a programmable gain amplifier, precision reference, reference buffers, current sources, temperature sensor and excitation sources all on-chip.

The AD7124-4 has four differential and seven pseudo-differential inputs and the AD7124-8 has eight differential and 15 pseudo-differential inputs.

The AFEs are designed to be used with devices with analogue outputs such as resistance temperature detectors, thermocouples, voltage/current inputs and current bridges.

The devices offer three user-selectable power modes. In the lowest power mode (255 µA) the converter delivers 21.7 noise free bits at low sampling rates.

The user-selectable power modes allow designers of programmable-logic controllers, process controllers, transmission systems and other industrial and instrumentation equipment to develop a single platform by precisely matching power/performance requirements for each use case.

Richard Wilson

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