ADI launches FET input analogue front end
Analog Devices has introduced a FET input AFE (analog front-end) with an integrated ADC driver designed to interface directly with current mode sensors such as photo diodes and highoutput impedance-voltage sensors.
The ADA4350 integrates a FET input amplifier, switching network and ADC driver into a single package, which simplifies design and lowers power and PCB footprint by more than 50 percent compared to discrete implementations.The chip has low-noise performance at low frequencies of 90 nV/√Hz at 10 Hz nd broadband noise of 5 nV/√Hz at 100 kHz to maximise the signal-to-noise ratio of the sensor output. Wide dynamic range measurement for small, sensitive signals such as photons or electrons is enabled with the inclusion of integrated gain switching.
The on-chip programmability of the ADA4350 allows designers to select external, optimized feedback components. With one chip, a single-ended or differential sensor current or voltage signal can be transformed to a high-speed, low-noise, single-ended or differential-output voltage.
In analytical measurement applications, light may need to be monitored over many decades of intensity. This requires a variety of gain switching networks that often incorporate multiple external amplifiers and analog switches, which increases the potential for system errors.
The ADA4350 integrates the switching networks and input amplifier to minimize leakage and allow the switching network to select up to six externally configurable feedback networks.
In test and measurement systems, the same high measurement accuracy must be maintained across the gain levels as the user adjusts the input range of the instrument.
For more detail: ADI launches FET input analogue front end