The AD7124-4 and AD7124-8 AFEs from Analog Devices connect directly to all standard industrial signal sources and sensor inputs, while reducing power requirements by 40 percent over comparable devices. The  power performance suits the new AFEs for an array of industrial and instrumentation applications including low power portable equipment.

The highly interated AD7124-4 (four differential and seven pseudo-differential inputs) and the AD7124-8 AFE (eight differential and 15 pseudo-differential inputs) simplify design architecture and shorten the design cycle by providing the flexibility to support easily multiple types of sensor inputs, including resistance temperature detectors, thermocouples, voltage/current inputs and current bridges. The new AFEs allow designers to reduce PCB footprint or apply the space savings to expand monitoring and connectivity functions within the same board area.

The devices incorporate a fully integrated signal chain with a 24-bit sigma-delta A/D converter, 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 saving valuable PCB area.

Both devices offer three user-selectable power modes that allow system designers to optimize 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.

Analog Devices, Inc.
www.analog.com