FMC30RF User Manual
r1.3
UM015
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•
AFE7225_RESET
•
AFE7225_PD
Refer to Appendix A for a description of these signals.
6.7 Guidelines for controlling the AMC7823
The following control signals connect from the FMC connector to the AMC7823;
•
SCLK (shared with other devices)
•
SDATA (shared with other devices)
•
AMC7823_CS#
•
AMC7823_SDOUT
•
AMC7823_GALR#
•
AMC7823_RESET#
Refer to Appendix A for a description of these signals.
7 Power supply
Power is supplied to the FMC30RF card through the FMC connector. The pin current rating is
2.7A, but the overall maximum as specified by the FMC standard is limited according to Table
3.
Voltage
# pins
Max Amps
Max Watt
+3.3V
4
3 A
10 W
+12V
2
1 A
12 W
VADJ (+2.5V)
4
4 A
10 W
VIO_B (+2.5V)
2
1.15 A
2.3 W
Table 3: FMC standard power specification
The power provided by the carrier card can be very noisy. Special care is taken with the power
supply generation on the FMC30RF card to minimize the effect of power supply noise on clock
generation, (de-)modulation, and data conversion.
Clean supply is derived from +3.3V and 12V in two steps for maximum efficiency. The first step
uses a high efficient switched regulators to ge3.8V and +5.5V power rails. From these
power rail the analog and digital supplies are derived with a low dropout, low noise, high PSRR,
linear regulator. At several stages in the power supply there is additional noise filtering with
beads and capacitance. Power supplies for different devices are isolated where necessary.
