TLV5639CDW datasheet by Texas Instruments

TLV5639CDW Frequently Asked Questions (FAQs)

• What is the recommended layout and routing for the TLV5639CDW 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 grounds separate. The analog input traces should be kept short and away from digital traces. Additionally, the decoupling capacitors should be placed close to the device and connected to the analog ground.
• How do I handle the internal reference voltage of the TLV5639CDW, and can I use an external reference?
  The internal reference voltage of the TLV5639CDW is 2.5V, and it is recommended to use this internal reference for most applications. However, an external reference can be used by connecting it to the REF pin, but it must be within the specified range of 2.4V to 2.6V.
• What is the maximum sampling rate of the TLV5639CDW, and how does it affect the power consumption?
  The maximum sampling rate of the TLV5639CDW is 1.5 MSPS, and it affects the power consumption. At higher sampling rates, the power consumption increases. For example, at 1.5 MSPS, the power consumption is around 15mW, while at 100 kSPS, it is around 5mW.
• How do I program the TLV5639CDW for different conversion modes, such as single-ended or differential input?
  The TLV5639CDW can be programmed for different conversion modes using the control register. The control register is accessed through the SPI interface, and the specific bits need to be set or cleared to select the desired conversion mode. For example, to select single-ended input, the INMODE bit needs to be set to 0.
• What is the recommended power-up sequence for the TLV5639CDW to ensure proper operation?
  The recommended power-up sequence for the TLV5639CDW is to first power up the analog supply (AVDD), followed by the digital supply (DVDD), and then the clock signal. This ensures that the internal reference voltage is stable before the device starts converting.