The CSDA-1 is a high performance clock signal distribution and isolation amplifier. The device is used to provide distribution of 1 PPS signals, 5 MHz signals and 10 MHz signals. The CSDA-1 contains a pulse distribution module with one input and five buffered outputs that can drive a 50-ohm cable. The second module is a 5 MHz distribution amplifier with one input and five outputs. The third module provides five buffered and isolated 10 MHz signals that are obtained by doubling the 5 MHz input signal. The channel-to-channel isolation in the RF distribution modules is typically 125 dB and reverse isolation is typically greater than 135 dB. The phase noise of the modules is exceptionally low, typically –150 dBc/Hz @ Fourier frequency of 1 Hz and –172 dBc/Hz @ Fourier frequency greater than 10 kHz. Both the input and output are matched to 50 ohms to obtain better than 25 dB return loss. All RF outputs are AC coupled and the grounds are DC isolated to reduce the effect of ground loops.


CSDA-1 Users Manual
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Pulse Distribution Module Specifications
ParameterConditionsMinTypMaxUnits
Rise Time 10-90 % - 3 4 ns
Fall Time 10-90% - 3 4 ns
Propagation delay 50 ohm load - 10 12 ns
Differential delay Channel - channel - 200 500 ps
Impedance Input
Output		 -
-		 1k
10		 -
-		 Ohms
Input High level
Input Low level		 Input signal into 50 ohm load
Input signal into 50 ohm load		 2
-0.7		 -
-		 5
0.8		 V
Output High level
Output Low level		 50 ohm load
50 ohm load		 2
-		 2.4
0.4		 -
0.5		 V
Temperature-delay coefficient 0-50 °C
25-35 °C		 -
-		 3
3		 5
-		 ps/°C
All tests done at 5 MHz and +13 dBm input unless otherwise specified
5 MHz Module Specifications
ParameterConditionsMinTypMaxUnits
Input Power 1 db compression 17 18 - dBm
Bandwidth +/-1 dB 1-20 - - MHz
Gain @5MHz - - +/-0.5 dB
Impedance Input
Output		 -
-		 50
50		 -
-		 Ohms
Return loss Input(S11) 5 MHz
Output (S22) 5 MHz		 -
-		 -35
-25		 -25
-25		 dB
Distortion +13 dBm
+17dBm		 -
-		 -48
-40		 -45
-		 dBc
Isolation Output to output
Output to input		 120
120		 126
135		 -
-		 dB
Phase noise 1 Hz
10 Hz
1 kHz
10 kHz		 -
-
-
-		 -150
-160
-171
-172		 -147
-157
-169
-170		 dBc/Hz
Temperature-delay coefficient 0-50 °C
25-35 °C		 -
-		 3
1.5		 5
-		 ps/°C
10 MHz Module Specifications
ParameterConditionsMinTypMaxUnits
Output Level 12 13 15 dBm
Bandwidth +/-1 dB 500 KHz 600 KHz 1 MHz -
Gain @5MHz - - +/-0.5 dB
Impedance Input/Output
Output		 -
-		 50
50		 -
-		 Ohms
Return loss Output (S22) 5 MHz - -25 -20 dB
Distortion +13 dBm
+17dBm		 -
-		 -
-48		 -45
-		 dBc
Isolation Output to output 120 126 - dB
Phase noise 1 Hz
10 Hz
1 kHz
>10 kHz		 -
-
-
-		 -142
-149
-159
-164		 -140
-147
-155
-160		 dBc/Hz
Temperature-delay coefficient 0-50 °C
25-35 °C		 -
-		 10
5		 -
-		 ps/°C

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