CSDA-1

CLOCK SIGNAL DISTRIBUTION AMPLIFIER

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 outputs 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.

  • Features
  • Applications
  • Specifications
  • Options
  • Distributes:
  • 1 PPS, 5 MHz & 10 MHz signals
  • High Isolation
  • Low phase noise
  • Very good stability
  • Signal fault alarm
  • Battery backup available
  • Clock signal applications
  • Atomic frequency standards
  • Atomic time scales
  • Laboratory frequency distribution
  • Reference frequency distribution
  • Time synchronization

PPS Module

PARAMETER

CONDITIONS

TYP

UNITS

Rise time

10 - 90 %

3

ns

Fall time

10 - 90 %

3

ns

Propagation delay

50 Ohm load

10

ns

Differential delay

channel - channel

200

ps

Impedance

input

output

50

10

Ohms

Input High level

Input Low level

Input signal into 50ohm load

Input signal into 50ohm load

2 to 5

-0.7 to 0.8

V

 

Output High level

Output Low level

50 ohm load

50 ohm load

2.4

0.4

V

Input signal level

1 MHz, 5 MHz and 10 MHz

+7

dBm

External Sync. Error

1 MHz

5 MHz

10 MHz

+/- 500

+/- 100

+/- 50

ns

Temp-delay

coefficient

0 - 50 ºC

 

3

 

ps/ºC

 

5 MHz Module

PARAMETER

CONDITIONS

TYP

UNITS

Input level

1 dB compression

18

dBm

Bandwidth

+/- 1 dB

0.5 - 65

MHz

Gain

@ 5 MHz

+/-0.2

dB

Impedance

input

output

50

50

Ohms

Return loss

 

input (S11) 5 MHz

output (S22) 5 MHz

-35

-35

dB

Distortion

+13 dBm

+17 dBm

-48

-42

dBc

Isolation

output to output

output to input

140

145

dB

Phase noise

1 Hz

10 Hz

1 kHz

10 kHz

-155

-165

-170

-171

 

dBc/Hz

Temp-delay

coefficient

0 - 50 ºC

1.2

ps/ºC

 

Product NameDescription
CSDA-1

Module 1 = 1PPS Input – Five Buffered Outputs
Module 2 = 5 MHz Input – Five Buffered Outputs
Module 3 = Five 10 MHz Outputs
Includes battery backup

CSDA-1 Opt A

Module 1 = 1PPS Input – Five Buffered Outputs
Module 2 = 5 MHz Input – Five Buffered Outputs
Module 3 = Five Buffered Outputs from Module 2
Includes battery backup

CSDA-1 Opt B

Module 1 = 1PPS Input – Five Buffered Outputs
Module 2 = One Input (1-50 MHz) – Five Buffered Outputs
Module 3 = One Input (1-50 MHz) – Five Buffered Outputs
Includes battery backup

CSDA-1 Opt C

Module 1 = 1PPS Input – Five Buffered Outputs
Module 2 = 1PPS Input – Five Buffered Outputs
Module 3 = 5 MHz Input – Five 10 MHz Outputs
Includes battery backup

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