TX-801 – Application Note

Application Note
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TX-801 – Application Note
Operating Guidelines for the TX-801 family of TCXOs
1) Pin 6 RF output
In case of clipped sine wave output a coupling capacitor of 1nF is
necessary.
2) Pin 7 Phase noise Filter
VI will enable the Phase noise filter to achieve the best possible
Phase noise behavior. This requires a 33nF capacitor at Pin 7 to GND.
Phase noise graphs shown on the catalogue datasheet are with
Phase noise filter enabled.
On request VI can disable the filter. This will automatically lead into a
customized part number. In this case no 33nF capacitor is necessary
and Pin 7 should be not connected.
3) Pin 8 Enable Control Pin
If connected to Vs or open the TCXO will function.
Enable pin function: TX-801
Pin 8 state:
Pin 6 output:
High
Data
Open
Data
Low
No Data
4) Pin 9 supply voltage needs to be blocked by a 100nF capacitor to
GND.
Pin Connections
1
Voltage Control (VC) or No Connect (option)
2
Do not connect
3
Do not connect
4
Ground (GND)
5
Ground (GND)
6
RF Output
7
Phase Noise Filter Capacitor (optional)
8
Enable Control
9
Supply Voltage Input (VS)
10
Ground (GND)
Temperature stability
To achieve the specified temperature stability, it is mandatory that the RF output is connected to a 15pF load.
Significant load differences will lead to a different frequency versus temperature behavior, as the TCXO’s are compensated with this load in
the factory.
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Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
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Application Note
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Vectron International reserves the right to make changes to the product (s) and or information contained herein without notice. No liability is assumed as a result of their use or application.
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Vectron Proprietary - not for distribution
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
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