ADS7834EB/250 datasheet by Texas Instruments

ADS7834EB/250 Frequently Asked Questions (FAQs)

• What is the recommended power-on sequence for the ADS7834EB/250?
  The recommended power-on sequence is to apply VCC first, followed by VREF, and then the clock signal. This ensures proper device operation and prevents latch-up.
• How do I handle the device's power-down mode?
  To enter power-down mode, set the PD pin low. In this mode, the device consumes minimal power, but the internal reference and oscillator are disabled. To exit power-down mode, set the PD pin high and wait for the t_WAKEUP time (typically 10 μs) before initiating conversions.
• What is the purpose of the REFOUT pin, and how do I use it?
  The REFOUT pin provides an output voltage reference (VREF) that can be used as an external reference for other devices. To use it, connect a 0.1 μF capacitor between REFOUT and GND, and then connect the output to the desired device. Ensure that the total load current does not exceed 0.5 mA.
• How do I optimize the device's performance for low-power operation?
  To optimize for low-power operation, use the lowest possible clock frequency, reduce the conversion rate, and use the power-down mode when not converting. Additionally, consider using a lower VCC voltage (e.g., 2.7 V) and reducing the internal reference voltage (VREF) to minimize power consumption.
• What is the recommended layout and routing for the ADS7834EB/250?
  To minimize noise and ensure proper operation, follow these layout and routing guidelines: keep the analog and digital signals separate, use a solid ground plane, and place the device close to the analog signal sources. Additionally, use short, direct traces for the clock and data lines, and avoid running them near noisy signals or power traces.