| PARAMETER | CONDITIONS | MIN | TYP | MAX | UNITS |
|---|---|---|---|---|---|
| External Clock Frequency* | 10 | 20 | 30.72 | MHz | |
| External Clock Frequency Accuracy | 1 | % | |||
| External Clock Frequency Drift | Including aging and temperature | 100 | ppm | ||
| Duty Cycle | Square wave | 45 | 55 | % | |
| External Clock Amplitude | Sine or square wave | 500 | 1500 | mVp-p | |
| External Clock Phase | At 100kHz | -130 | dBc/Hz |
*Selecting an external reference clock frequency other than 20MHz requires programming the SC1905 through the SPI bus. See SPI Programming Guide and Hardware Design Guide for more information. User may program the SC1905 to accept the following clock frequencies: 10MHz, 13MHz, 15.36MHz, 19.2MHz, 20MHz, 26MHz, and 30.72MHz.
| PARAMETER | CONDITIONS | MIN | TYP | MAX | UNITS |
|---|---|---|---|---|---|
| ESR | 50 | Ω | |||
| Capacitive Load to Ground | 10 | 12 | pF | ||
| Frequency Accuracy | 250 | ppm | |||
| Frequency Drift | Including aging and temerature | 100 | ppm |
From a programming perspective, the SC1905, like previous RFPAL products, is quite complex. An entire document, the SC1905 SPI Programming Guide, is dedicated to describing how the host communicates with the SC1905. It describes the communication protocol in addition to the addresses of all the variables and and parameters for monitoring the status and configuration of the SC1905.
For guidance on how to design the SC1905 into a system; for example, recommendations on PCB layout, regulator and delay line selection etc. please refer to the SC1905 Hardware Design Guide. The Firmware 6.0.01.00 Release Notes provide data on linearization performance of the firmware. These auxiliary documents are available on the SC1905 product web page on Maxim's website.