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ONE EOSC10KV3 User Manual

Ultra-pure reference oscillator
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Document Revision
A
05/03/2016
1)
What is it ? ..................................................................................................................... 2
2)
Operating outputs frequencies. ..................................................................................... 3
3)
Instrument operation. .................................................................................................... 3
1)
power supply requirements. ............................................................................................................ 3
2)
Using outputs .................................................................................................................................. 3
3)
Rear "H2 trim" output. ..................................................................................................................... 4
4)
First power-up tests. ....................................................................................................... 4
5)
Adjustment procedure. ................................................................................................... 5
6)
Technical specifications. ................................................................................................. 6
1)
General parameters ......................................................................................................................... 6
2)
THD figures @ 10kHz with SYS2722 using high depth notch filter) ................................................. 6
1)
THD @ Vout = 1 Vrms ( 0 dBV / 2,8 Vpp), OUT1 and OUT2 ............................................................. 6
2)
THD @ Vout = 2 Vrms (+6 dBV / 5,7 Vpp), OUT1 and OUT2 ............................................................ 6
3)
THD @ Vout = 3 Vrms (+9,5 dBV / 8,5 Vpp), OUT1 and OUT2 ......................................................... 7
4)
THD @ Vout = 4 Vrms (+12 dBV / 11,3V pp), OUT1 and OUT2 ........................................................ 7
3)
Circuit board adjustment trimmers placement. ............................................................................... 8
EOSC10KV3 USER MANUAL
EOSC10KV3 USER MANUAL
Ultra-pure reference oscillator
(from AN67 from Linear-Technology)
Date
Modifications
First release
Contents
Page 1/8
EOSC10KV3_Manual.odt
OnEAudioProjects
contact@oneaudio.net
www.oneaudio.net
Author
ON

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Summary of Contents for ONE EOSC10KV3

  • Page 1: Table Of Contents

    EOSC10KV3 USER MANUAL EOSC10KV3 USER MANUAL EOSC10KV3_Manual.odt OnEAudioProjects Ultra-pure reference oscillator contact@oneaudio.net (from AN67 from Linear-Technology) www.oneaudio.net Document Revision Date Modifications Author 05/03/2016 First release Contents What is it ? ........................2 Operating outputs frequencies..................3 Instrument operation..................... 3 power supply requirements.

  • Page 2: What Is It

    EOSC10KV3 views 1) What is it ? The EOSC10KV3 is an ultra low THD sine wave oscillator, used as a reference for audio testing purpose or evaluating high resolution/high performance ADC. This design come from the AN67 Linear-Technology Application Note from Dale Eagar.

  • Page 3: Operating Outputs Frequencies

    I built myself a 1kHz version of the oscillator, and checked with success same or better THD level than the 10kHz version. In addition, i provide with the EOSC10KV3 design folder a full bill of material for each 1kHz and 10kHz oscillator version. There is only minors values change between us.

  • Page 4: Rear "H2 Trim" Output

    Then, take a current limited variable power supply. Set the current limit to /-100mA and the output voltage to 0V. Connect it to EOSC10KV3 and switch it ON. (It is preferable that you could read current on both rails of the power supply when powering) Now, increase slowly the symmetric voltage and verify that input current doesn't rise up more than few tenth of mA.

  • Page 5: Adjustment Procedure

    First, verify that RV1 is at middle position (It's H2 trim). Then : Connect one output to a real time spectrum analyser (sound-card and FFT analysis software like Arta), or to an oscilloscope (you need to show amplitude change, choose fast FFT view with low bin count).

  • Page 6: Technical Specifications

    6) Technical specifications. 1) General parameters Parameter Unit Power supply voltage range 20** Current consumption (outputs unloaded). Output amplitude adjustment range (single ended) Vrms Output amplitude adjustment range (differential) Vrms Total harmonics distortion (Vo= 1 Vrms). Rload= 10 < -130 0,000016 KOhms * : Only for LT1761/LT1964 regulators, otherwise 14,5V min.

  • Page 7: Thd @ Vout = 3 Vrms (+9,5 Dbv / 8,5 Vpp), Out1 And Out2

    THD of the analyser. So, for this reason a 10 kHz passive notch-filter is added between the EOSC10KV3 and the analyser input to avoid THD coming from the analyser itself. The notch-filter attenuation at the harmonics frequencies is taken into account in measurements by the SYS2722 to show a real amplitude of harmonics (all FFT plots above).

  • Page 8: Circuit Board Adjustment Trimmers Placement

    Others OnE Audio Designs : ERMSDCV2, DC-1MHz RMS voltmeter & 80dB 10Hz-100kHz Ultra low noise amplifier. EOSC10KV3, ultra low THD 10kHz reference oscillator. AA5381V1, 24bits/192kHz stand alone high performance Analog to Digital converter. EHAMP08, Remote controlled TPA6120 based headphone amplifier.

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