TDA7469 datasheet by STMicroelectronics

TDA7469 Frequently Asked Questions (FAQs)

• What is the recommended layout for the TDA7469?
  STMicroelectronics provides a recommended layout in the application note AN2863, which can be found on their website. The layout should ensure that the power supply lines are separated from the analog signal lines to minimize noise and ensure proper operation.
• How do I choose the right value for the external resistors R1 and R2?
  The values of R1 and R2 depend on the desired gain and input impedance of the amplifier. A good starting point is to set R1 = R2 = 1 kΩ, and then adjust the values based on the specific application requirements. The datasheet provides a formula to calculate the gain based on R1 and R2.
• What is the maximum power dissipation of the TDA7469?
  The maximum power dissipation of the TDA7469 is 1.4 W, which is dependent on the ambient temperature and the thermal resistance of the package. The datasheet provides a thermal derating curve to determine the maximum power dissipation at a given temperature.
• Can I use the TDA7469 as a line driver?
  Yes, the TDA7469 can be used as a line driver. It has a high output current capability and a low output impedance, which makes it suitable for driving long cables. However, the output stage is not designed to drive heavy loads, and the maximum output current should not exceed 100 mA.
• How do I protect the TDA7469 from electromagnetic interference (EMI)?
  To protect the TDA7469 from EMI, it is recommended to use a shielded enclosure, and to keep the analog signal lines and power supply lines as short as possible. Additionally, decoupling capacitors should be placed close to the device to filter out high-frequency noise.