Si57x-EVB

Rev. 0.2

9

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

Near end load

on board

J3

CONN, HEADER, 2X1 High Z probe test point

R3

15 pF

Install 0603 load capacitor at resistor location.

Far end

load off board

C3

33–50



Install 0603 source impedance matching resis-

tor at capacitor location for driving transmission

line.

LVDS

AC coupling

C2, C3

0.1 µF

ac coupling capacitors

DC coupling

C2, C3

0



Install 0603 resistors at cap locations.

LVPECL

AC coupling

C2, C3

0.1 µF

ac coupling capacitors

R2, R3

130–150



Local bias resistors

DC coupling

C2, C3

0



Install 0603 resistors at cap locations.