在datasheet上看到LMK04828支持LCPECL,请问什么是LCPECL,LCPECL和LVPECL的区别是什么呢?
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您好,我找了下没有相关文档来介绍LCPECL电平, 通过下面这个图可以看出,LCPECL是通过射极电阻组成的分压网络来设置DC耦合信号的共模电压。
另外,关于LVPECL和LCPECL几种不同电平标准,emitter 电阻阻值大小的取值和输出幅值的关系,建议参考下下表:
Load is AC coupled 100 ohms differential.
| Frequeny | Format | Emitter Resistor | Amplitude Diff (Vpp) | Icc (mA) | Informational Only |
| 122.88 | LVPECL16 | 68 ohm | 1.55 | Yes | |
| 122.88 | LVPECL20 | 68 ohm | 1.92 | Yes | |
| 122.88 | LCPECL | 68 ohm | 1.8 | Yes | |
| 122.88 | LVPECL16 | 120 ohm | 1.54 | 35.5 | No |
| 122.88 | LVPECL20 | 120 ohm | 1.85 | 36.2 | No |
| 122.88 | LCPECL | 120 ohm | 1.45 | 27.3 | No |
| 122.88 | LVPECL16 | 200 ohm | 24.9 | No | |
| 122.88 | LVPECL20 | 200 ohm | 25.7 | No | |
| 122.88 | LCPECL | 200 ohm | 20.0 | No | |
| 122.88 | LVPECL16 | 240 ohm | 1.25 | 22.1 | No |
| 122.88 | LVPECL20 | 240 ohm | 1.24 | 22.9 | No |
| 122.88 | LCPECL | 240 ohm | 0.968 | 18.0 | No |
| 122.88 | LVPECL16 | 330 ohm | 1.04 | ||
| 122.88 | LVPECL20 | 330 ohm | 1.04 | ||
| 122.88 | LCPECL | 330 ohm | 0.761 |