AD7124-4/-8 Analog Front Ends Analog Devices AD7124-4/-8 Analog Front Ends (AFE) portfolio features low power, low noise, completely integrated AFEs for high precision measurement applications. Developed with the highest degree of signal chain integration, the AD7124-4/-8 AFE contains a low noise, 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC) as well as a precision, low noise, low drift internal bandgap reference. The device also accepts an external differential reference, which can be internally buffered.