仅对英特尔可见 — GUID: xwb1486071202393
Ixiasoft
收发器参考时钟规范
符号 | Refclk参数 | 最小值 | 典型值 | 最大值 | 单位 |
---|---|---|---|---|---|
VTT | Termination Voltage (2.5V compliant) | 0.4 | 0.5 | 0.6 | V |
VTT | Termination Voltage (3.3V compliant) | 1.04 | 1.3 | 1.56 | V |
RTT | Termination Resistor | 40 | 50 | 60 | Ohm |
VDIFF | Differential Voltage | 0.4 | 0.8 | 1.2 | V |
VCM | Input Common Mode Voltage (2.5V compliant, no internal termination resistor) | VDIFF/2 | VCCCLK_GXE-VDIFF/2 | V | |
VCM | Input Common Mode Voltage (2.5V compliant, internal termination resistor) | VCCCLK_GXE - 1.6 | VCCCLK_GXE - 1.3 | VCCCLK_GXE - 1.0 | V |
VCM | Input Common Mode Voltage (3.3V compliant, no internal termination resistor) | VDIFF/2 | VCCCLK_GXE-VDIFF/2 | V | |
VCM | Input Common Mode Voltage (3.3V compliant, internal termination resistor) | 1.4 | 2 | 2.6 | V |
参数 | 条件 | 最小值 | 典型值 | 最大值 | 单位 |
---|---|---|---|---|---|
Frequency | - | 125 | 156.25 | 700 | MHz |
Frequency Tolerance | - | -100 | 100 | PPM | |
Clock Duty Cycle | - | 45 | 50 | 55 | % |
Rise & Fall Times | 20% - 80% | 40 | 300 | ps | |
Phase Jitter | 12 KHz - 20 MHz | 0.375 | 0.5 | ps rms | |
Phase Noise 117 | 10 KHz | -130 | dBc/Hz | ||
100 KHz | -138 | dBc/Hz | |||
500 KHz | -138 | dBc/Hz | |||
3 MHz | -140 | dBc/Hz | |||
10 MHz | -144 | dBc/Hz | |||
20 MHz | -146 | dBc/Hz |
117 上表中的相位噪声(phase noise)数是在156.25 MHz载波频率下测得的最大可接受相位噪声值。如要计算任何其他频率的相位噪声要求,请使用以下公式:REFCLK phase noise at f (MHz) = REFCLK phase noise at 156.25 MHz + 20*log10(f/156.25)