买了一块TAS5548的Demo板,自己也画了一块TAS5558的板子。TAS5548的片子在Demo板和我自己的板子上都能正常工作,PurePath也能控制。
但2块板子换上TAS5558的片子就都不工作了,晶振也不起振,PurePath也找不到芯片。
请问TAS5558与TAS5548在应用上有哪些需要注意的事呢。
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看下二者的引脚排列情况,TAS5548的Pin 10,11 为XTAL 的连接引脚,而TAS5558的Pin11 为外部提供时钟引脚MCLK, Pin10为ASEL_EMO2. 因此如果直接替换,会引起晶振不起振的情况。
TI的官方回复
Please modify TAS5548EVM as below if replacing TAS5548 with TAS5558 on TAS5548EVM since TAS5558 doesn't support the external crystal.
- Modification
1. Remove C17, C18, Y2 and R23
2. Replace C18 with 18.2kΩ Resistor(1% Tolerance)
3. Assemble R24 with 47Ω Resistor
4. Replace TAS5548(U1) with TAS5558