ADS7818EB/250 datasheet by Texas Instruments

ADS7818EB/250 Frequently Asked Questions (FAQs)

• What is the recommended layout and routing for the ADS7818EB/250 to minimize noise and ensure accurate conversions?
  Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital signals separate. The analog input traces should be short and direct, and the digital output traces should be routed away from the analog inputs. Additionally, decoupling capacitors should be placed close to the device.
• How do I ensure the accuracy of the ADC conversion results, especially at high frequencies?
  To ensure accuracy, it's essential to follow proper PCB layout and routing guidelines, use a low-noise power supply, and ensure the analog input signals are properly filtered and buffered. Additionally, the ADC should be operated within its specified frequency range, and the input signals should be within the specified voltage range.
• What is the recommended clock frequency for the ADS7818EB/250, and how does it affect the conversion rate?
  The recommended clock frequency for the ADS7818EB/250 is between 1 MHz and 20 MHz. The conversion rate is directly proportional to the clock frequency, with a maximum conversion rate of 250 kSPS at a clock frequency of 20 MHz.
• How do I handle the digital output data from the ADS7818EB/250, and what is the format of the output data?
  The ADS7818EB/250 outputs 16-bit digital data in a serial format, with the most significant bit (MSB) first. The output data is in two's complement format, and the device can be configured to output data in either right-justified or left-justified format.
• What is the power consumption of the ADS7818EB/250, and how can I reduce power consumption in my design?
  The power consumption of the ADS7818EB/250 is typically around 15 mW at a clock frequency of 1 MHz. To reduce power consumption, the device can be operated at a lower clock frequency, and the power-down mode can be used when the device is not in use.