New from Analog Devices are two analog front-end (AFE) devices with integrated 24-bit sigma-delta converter cores that deliver a powerful combination of low power, low noise and signal chain integration. The AD7124-4 and AD7124-8 AFEs connect directly to all standard industrial signal sources and sensor inputs, and are suitable for an array of industrial and instrumentation applications including low-power portable equipment.
The high degree of integration of the AD7124-4 (four differential and seven pseudo-differential inputs) and the AD7124-8 (eight differential and 15 pseudo-differential inputs) simplifies design architecture and shortens the design cycle by providing the flexibility to support multiple types of sensor inputs, including resistance temperature detectors, thermocouples, voltage/current inputs and current bridges.
The devices incorporate a fully integrated signal chain with a 24-bit sigma-delta analog-to-digital converter (ADC), programmable gain amplifier (PGA), precision reference, reference buffers, current sources, temperature sensor and excitation sources on a single chip. Integrated diagnostic features support SIL compatibility and reduce the need for discrete diagnostic components.
The chips offer three user-selectable power modes that allow system designers to optimise throughput rate versus required noise performance. 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.
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