AFE integrates ADC driver to interface with sensors

The ADA4350 features low-noise performance at low frequencies of 90nV/√Hz at 10Hz and broadband noise of 5nV/√Hz at 100kHz to maximise the SNR of the sensor output. Integrated gain switching enables wide dynamic range measurement for small, sensitive signals such as photons or electrons. 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 analogue switches, which increases the potential for system errors. The ADA4350 integrates the switching networks and input amplifier to minimise 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 measuring a wider dynamic range, the ADA4350 is suitable because of its high-impedance/low-Ib input amplifier and serial port-controlled switch network. The device also reduces PCB footprint while significantly increasing channel count without thermal density restrictions.

Supplied in a 28-lead TSSOP, the ADA4350 AFE is available now for $5.73 each in 1,000 unit quantities.