ADM-XRC-9R1 User Manual
V1.7 - 16th Sept 2020
3.4.6 Digital System Oscillators
There are four fixed oscillators on the board for the digital system. The USB and Ethernet reference clocks are
used internally by the PHYs.
Signal
Frequency
FPGA pin
PS Ref Clock
50MHz
M25
Si5338 Ref Clock
25MHz
-
USB Ref Clock
24MHz
-
Ethernet Ref Clock
25MHz
-
Table 9 : Reference clocks Connections
3.4.7 RF Sampling Clocks
The RF reference clocks are generated with a dual-loop jitter cleaner PLL. The RF sampling clocks are provided
by three LMX2594 RF clock synthesisers.
Figure 6 : ADM-XRC-9R1 RF sampling clock
Signal
Frequency
Target FPGA Input
"P" pin
"N" pin
ADC_CLK_224
Variable
ADC_CLK_224
AD5
AD4
ADC_CLK_225
Variable
ADC_CLK_225
AB5
AB4
ADC_CLK_226
Variable
ADC_CLK_226
Y5
Y4
ADC_CLK_227
Variable
ADC_CLK_227
V5
V4
DAC_CLK_228
Variable
DAC_CLK_228
L5
L4
DAC_CLK_229
Variable
DAC_CLK_229
J5
J4
Table 10 : RF Clock Connections
Page 12
Functional Description
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