Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital signals separate. Use short, direct traces for the analog inputs and outputs, and avoid crossing digital signals over the analog signals. Additionally, use a common-mode filter capacitor between the analog input pins and the analog ground pin.
The internal reference voltage can be enabled by connecting the REFEN pin to a logic high. For an external reference, connect the REF pin to the external reference voltage source and ensure it is within the recommended range of 2.5V to 5.5V. Using an external reference can provide better accuracy and stability, but it may also introduce additional noise and require more complex PCB design.
The ADS5120CZHK can achieve a maximum sampling rate of 125 MSPS. However, the actual sampling rate may be limited by the clock frequency, analog input bandwidth, and the system's overall noise performance. Additionally, the device's power consumption and thermal performance may also impact the maximum achievable sampling rate.
The ADS5120CZHK provides digital output data in a 12-bit or 14-bit format, depending on the configuration. The output data can be handled using a FIFO or a parallel interface. The choice of output format depends on the system's requirements, with 12-bit format providing faster data transfer rates and 14-bit format offering higher resolution. Ensure proper synchronization and data alignment when handling the digital output data.
The ADS5120CZHK has a maximum junction temperature of 150°C. Ensure proper heat dissipation by using a heat sink, thermal vias, and a thermally conductive PCB material. Keep the device away from heat sources, and avoid high ambient temperatures. Monitor the device's temperature and adjust the system's thermal design accordingly to ensure reliable operation.
ADS5120CZHK datasheet
by Texas Instruments
