SI57X-EVB Datasheet, PDF (9/34 Pages) Silicon Laboratories – Si57X/598/599 ANY FREQUENCY I2C PROGRAMMABLE XO/VCXO EVALUATION BOARD

Si57x-EVB
1.9. Si57x Daughterboard
The Si57x daughterboard can accommodate either Si570/571/598/599 devices and supports all output formats. All
Si570 and Si598 XOs are pin and register compatible, and all Si571 and Si599 VCXOs are pin and register
compatible. Typically, the boards are shipped without the sample device or any output components. Table 4 lists
suggested output loading options for different output formats and coupling configurations.
Table 4. Si57x Daughterboard Output Loading Options
Output
Format
Config
REF DES
Location
Value
Comments
CML
AC coupling
only
C2,C3
0.1 µF
ac coupling capacitors
CMOS
LVDS
Near end load
on board
Far end
load off board
AC coupling
DC coupling
J3
R3
C3
C2, C3
C2, C3
CONN, HEADER, 2X1 High Z probe test point
15 pF
Install 0603 load capacitor at resistor location.
33–50 
0.1 µF
Install 0603 source impedance matching resis-
tor at capacitor location for driving transmission
line.
ac coupling capacitors
0
Install 0603 resistors at cap locations.
AC coupling
LVPECL
C2, C3
R2, R3
0.1 µF
130–150 
ac coupling capacitors
Local bias resistors
DC coupling C2, C3
0
Install 0603 resistors at cap locations.
Rev. 0.2
9