ZHCSOI5 October 2021 ADC12DJ1600 , ADC12QJ1600 , ADC12SJ1600
PRODUCTION DATA
The analog input of the device has an internal buffer to enable high input bandwidth and to isolate sampling capacitor glitch noise from the input circuit. The analog input must be driven differentially because operation with a single-ended signal results in degraded performance. Both AC-coupling and DC-coupling of the analog input is supported. The analog input is designed for an input common-mode voltage (VCMI) of 1.1 V, which is terminated internally through single-ended, 50-Ω resistors to the VA11 supply on each input pin. DC-coupled input signals must have a common-mode voltage that meets the device input common-mode requirements specified as VCMI in the Recommended Operating Conditions table. The device includes internal analog input protection to protect the ADC input during over-range input conditions; see the Analog Input Protection section. Figure 9-4 provides a simplified analog input model.