4-2
4.1
EVM Power Connections
Figure 4−1. Power Connections for the CDCM1804/CDCP1803 EVM
Pulse
Generator
Oscilloscope
CDCM1804/
CDCP1803
EVM
Power
Supply
+
_
3.3 V
Yn
GND
V
CC
Matched
cables
SMA to SMA
Yn
Output
50
50
Matched
cables
SMA to SMA
IN
IN
4.2
Applying an Input
LVPECL inputs should be applied to SMA connectors IN pair. The two
differential 50-
Ω
resistors, R11 and R12, are used to terminate the LVPECL
input.
As shown in Figure 4−1, the power supply is used to provide the required 3.3 V
to the EVM. The EVM ground is connected to the oscilloscope ground through
the returns on SMA. With power applied, the common-mode voltage seen by
the CDCM1804/CDCP1803 is approximately equal to the reference voltage
being used inside the device preventing significant common-mode current to
flow.
4.3
Typical Test Results
Figure 4−2 shows a typical test result obtained with the EVM. Figure 4−2
shows the output of the CDCM1804/CDCP1803 being driven directly into a
50-
Ω
oscilloscope.
Содержание CDCM1804
Страница 1: ... 2006 High Performance Analog CDC User s Guide SCAU009C ...
Страница 10: ...1 2 Figure 1 1 CDCM1804 CDCP1803 EVM Default Setup ...
Страница 17: ...4 3 Using the EVM Figure 4 2 Typical LVPECL Output from the CDCM1804 CDCP1803 EVM ...
Страница 18: ...4 4 Figure 4 3 Typical CMOS Output from the CDCM1804 EVM ...
Страница 20: ...Schematic 5 2 5 1 Schematic Figure 5 1 Schematic of EVM Signal Path ...
Страница 22: ...Schematic 5 4 5 3 Board Stack Up and Layer Patterns Figure 5 2 Top Layer Figure 5 3 PWR1 Layer ...
