ADS7870EA datasheet by Texas Instruments

ADS7870EA Frequently Asked Questions (FAQs)

• What is the recommended layout and routing for the ADS7870EA?
  The recommended layout and routing for the ADS7870EA involves keeping the analog and digital grounds separate, using a solid ground plane, and minimizing the length of the analog input traces. Additionally, it's recommended to use a 4-layer PCB with a dedicated analog power plane and a dedicated digital power plane.
• How do I optimize the performance of the ADS7870EA in noisy environments?
  To optimize the performance of the ADS7870EA in noisy environments, use a low-pass filter at the input, use a shielded cable for the analog input, and consider using a common-mode filter. Additionally, ensure that the analog and digital grounds are properly separated and decoupled.
• What is the maximum sampling rate that can be achieved with the ADS7870EA?
  The maximum sampling rate of the ADS7870EA is 1 MSPS, but it can be increased to 2 MSPS in pseudo-differential mode. However, the actual sampling rate may be limited by the system's clock frequency and the analog input bandwidth.
• How do I handle the offset and gain errors in the ADS7870EA?
  The ADS7870EA has a built-in offset and gain calibration feature. Use the CAL pin to initiate the calibration sequence, and the device will automatically adjust the offset and gain to minimize errors. Additionally, consider using external calibration circuits or software correction algorithms to further improve accuracy.
• What is the power consumption of the ADS7870EA, and how can I reduce it?
  The power consumption of the ADS7870EA is typically around 15 mW at 1 MSPS. To reduce power consumption, consider using the power-down mode, reducing the clock frequency, or using a lower supply voltage. Additionally, use a low-power mode for the digital interface, such as SPI or I2C.