GS9024 Data Sheet

521-70-10

February 2005

13 of 16

5.5 I/O Description

5.5.1 High Speed Analog Inputs (SDI/SDI)

SDI/SDI are high impedance inputs which accept differential or single-ended input

drive.

Figure shows the recommended interface when a single-ended serial digital signal

is used.

5.5.2 High Speed Outputs (SDO/SDO)

SDO/SDO are current mode outputs that require external pullups (see Figure ).

The output signal swings are 800mV when 75

Ω resistors are used. A diode can be

approximately 0.7 volts. When the output traces are longer than 1 inch, controlled

impedance traces should be used. The pullup resistors should be placed at the end

of the output traces as they terminate the trace in its characteristic impedance

(75

Ω).

SDI

GS9024

SDI

75

Ω

37.5

Ω

75

Ω

10nF

10nF

75

Ω

SDO

SDO

GS9024

75

Ω

75

Ω