Applications Information

External Clock (XTALI) Requirements

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

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.

Crystal Requirements

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

Auxiliary Documentation

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.

SC1905

698MHz to 3800MHz RF Power Amplifier Linearizer

(RFPAL)

www.maximintegrated.com

Maxim Integrated | 11