Sundance SMT791 - Manual (Page 11)

4.2.2 Analogue Input Section
The SMT391 comes with two analogue input options – AC Coupled.
The AC Coupled option uses a twisted pair balun (MACOM TP-101) transformer to
convert a single ended signal to a balanced AC Coupled input on the ADC. The
figure on the following page shows this setup. Note that the input on the ADC is
differential and that for each of these two signals there are two pads on the ADC.
One pad connects to the transformer and the second pad is terminated through a 50
Ohm resistor to ground.
R1
R1
TP101
Input
Connector
Figure 2: AC-Coupled Analogue Input stage.
User Manual SMT791 Page 11 of 11 Last Edited: 12/10/2010 09:52:00