ADC122S021CIMM datasheet by Texas Instruments

ADC122S021CIMM Frequently Asked Questions (FAQs)

• What is the recommended input impedance for the ADC122S021CIMM?
  The recommended input impedance for the ADC122S021CIMM is 1 kΩ to 10 kΩ. This ensures proper signal attenuation and filtering.
• How do I handle the ADC's clock signal when using it in a synchronous mode?
  When using the ADC122S021CIMM in synchronous mode, the clock signal should be connected to the CLKIN pin. The clock frequency should be between 1 MHz and 50 MHz, and the clock signal should be a clean, low-jitter signal.
• What is the purpose of the VREF pin, and how do I connect it?
  The VREF pin is the reference voltage input for the ADC. It should be connected to a stable voltage source between 0.5 V and 2.5 V. The VREF pin sets the full-scale range of the ADC, and it's recommended to use a low-noise, low-temperature-coefficient voltage reference.
• How do I ensure proper power sequencing when powering up the ADC122S021CIMM?
  To ensure proper power sequencing, the AVDD and DVDD pins should be powered up simultaneously, and the AVDD pin should be powered up before the DVDD pin. The power-up sequence should be: AVDD, then DVDD, then CLKIN.
• What is the maximum sampling rate of the ADC122S021CIMM, and how do I achieve it?
  The maximum sampling rate of the ADC122S021CIMM is 200 kSPS. To achieve this rate, the clock frequency should be set to 50 MHz, and the ADC should be operated in continuous conversion mode.