PCM6360-Q1: PCM AC耦合电路接法及AC耦合电容选择

liang zhang

Part Number: PCM6360-Q1

您好，

1.请问AC耦合电容如何选择；

2.MIC1通道AC耦合输入MIC信号，请根据PCM6xx0Q1EVM-PDK Evaluation Module (Rev. B) 的案例1介绍下，当MK1输入，输入电路为AC耦合接法时，J36/J37/J3/J4-GND/J11/J12 installed ，J7/J8 uninstalled。接法是否正确？

3.帮忙check所对应的原理图，红框部分为焊接元器件。

请关注：1.MIC供电方式；2.AC耦合输入的接法。

11 天前

0 FRANK1 10 天前

TI__Genius 14970 points

感谢您对TI产品的关注！
关于你的咨询，我们正在确认您的问题，感谢您的耐心等待。

0 Eirwen 9 天前回复 FRANK1

TI__Mastermind 28925 points

1) Coupling cap value is chosen based off the high pass filter formed by the AC cap + input impedance R.

2) yes you are correct. Refer to table 2-1 for the table on jumper configurations for various scenarios.

3) Schematic looks okay. Remember for layout to connect the MICBIAS star as close to the device pin as possible to reduce any cross-talk through the MICBIAS node.

0 liang zhang 8 天前

Prodigy 120 points

感谢您的回复。

MIC的最大输出电压Vrms=1V/THD<3%，按下图接的话，请问R1如何选择。这种接法可行吗？

0 liang zhang 8 天前回复 liang zhang

Prodigy 120 points

0 Eirwen 7 天前回复 liang zhang

TI__Mastermind 28925 points

The diode is not necessary.

The AC coupling cap is required on both legs as well as the MICBIAS resistor to provide bias to the ADC input pins. Check the diagrams in the data sheet for references on this.

There is a link in the datasheet to a tool that will help you calculate R1.

0 liang zhang 7 天前回复 Eirwen

Prodigy 120 points

您好，

二极管在ECU1中已经存在，无法去掉。请问在ECU2中如何设计可以保证MIC正常工作.

0 liang zhang 7 天前回复 liang zhang

Prodigy 120 points

0 Eirwen 2 天前回复 liang zhang

TI__Mastermind 28925 points

我已经提供了如何设计ECU2的指导。另请参阅数据表中的应用程序图。

Eirwen 说：
The AC coupling cap is required on both legs as well as the MICBIAS resistor to provide bias to the ADC input pins. Check the diagrams in the data sheet for references on this.

There is a link in the datasheet to a tool that will help you calculate R1.

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PCM6360-Q1: PCM AC耦合电路接法及AC耦合电容选择