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Manual CC2 © Grimm Audio

13

Imagine the signal on top. The AD converter samples it
at neatly uniform intervals. The DA converter
reconstructs the correct values but it gets the timing
wrong. The difference between the red and blue curve
shows the error. Or take the converse: the DAC is fine
but the ADC took samples at the wrong time. The effect
is much the same. What’s worse in this case is that the
numbers we’ve recorded are now wrong. In the previous
case we could slap in a better DAC, with a jittery ADC the
game is over.

Jitter in AD (top) and DA (bottom) converters

6.

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Содержание CC2

Страница 1: ...ual before operating the unit Longing for detail naturalness and imaging in digital Your system needs a reliable conductor CC2 the affordable clock you can t afford to miss Please read this manual before operating the unit ...

Страница 2: ...dio 2 Table of Contents 1 Introduction 3 2 Important Safety Instructions 4 3 Installing 6 4 Signal Connections 8 5 Operation 9 6 Jitter Explained 11 7 Specifications 14 8 Grimm Audio Limited Warranty 15 Table of Contents ...

Страница 3: ...of applications such as House Sync generation in audio studios Two outputs offer enough flexibility for most modern setups The extremely low jitter of the CC2 clock outputs maximises the sound recording and playback quality potential of the devices connected Clock stability improvement and hence improved sound of digital live audio systems By slaving your main stage box to a CC2 the system sound q...

Страница 4: ...o que el texto en versión Inglesa no ofrece ninguna duda de interpretación y se entiende integramente Si este no fuese su caso rogamos contacte con Grimm Audio quien a petición se encargaría de enviarle la correspondiente traducción Please follow these precautions when using this product 1 Read these instructions 2 Keep these instructions 3 Heed all warnings 4 Follow all instructions 5 Dangerous v...

Страница 5: ... not spray any liquid cleaner onto the cabinet as this may lead to dangerous shocks Do not spray any liquid cleaner onto the faceplate as this may damage the front panel 14 Install in accordance with the manufacturer s instructions 15 Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat Avoid exposure to direct sunli...

Страница 6: ...ING To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture 3 Installing Unpacking and Inspection Your CC2 was carefully packed at the factory and the packaging it came in was designed to protect it from the trials and tribulations of shipping Keep the box and all packing materials so that in the unlikely event that you need to return the CC2 for servicing you...

Страница 7: ...exposure to direct sun light since the padouk wood is susceptible to discolor in UV light AC Power Hookup The CC2 has a linear power supply that needs to be factory set for your local line voltage 115V or 230V 10 Make sure to check the line voltage at the back near the IEC cable entrance wired for V and verify if this complies with your local mains voltage The CC2 is shipped with a proper mains ca...

Страница 8: ... CC2 Central Clock Source 1 2 Handcrafted in the Netherlands Serial 12 0 001 xxx WARNING This apparatus must be earthed Wired for 230V 115V Word Clock Out 75Ω 1 2 Impedance low CAUTION Risk of electric shock Do not open Mains power connection 4 Signal Connections Base rate Multiplication factor ...

Страница 9: ...les Although the word clock frequency itself is relatively low the transitions are steep Taken as a whole word sync is a wideband signal usually necessitating characteristic termination at least at one end of the cable Better still is series termination on the transmit end and parallel termination on the receiving end This minimises reflections even when the cable impedance is not exactly matched ...

Страница 10: ...C2 should be set to slave to word clock The preferred system wiring is star distribution where each output of the CC2 connects to one device Daisy chain connections using T junctions should be avoided where possible The latter will most likely fail because of the lack of standardisation of termination impedance and signal levels In case you need more word clock outputs consider to buy our CC1 cloc...

Страница 11: ...ter is an instability in the timing of a clock signal Ideally the rising or falling edges of a clock signal are all separated by exactly the same amount of time In reality the timing is more uncertain The graph below shows the time domain view of the problem We can also look at the problem spectrally An ideal clock has only a single frequency components and harmonics All energy is concentrated on ...

Страница 12: ...cal perspective but as far as signal quality is concerned you re better off with a stable clock at an inexact frequency Jitter is not a problem in fully digital processes As long as it isn t so large that a processor can t distinguish the previous bit from the next all digital processes are completely indifferent about jitter The problem occurs when you go from the analogue domain into the digital...

Страница 13: ...e difference between the red and blue curve shows the error Or take the converse the DAC is fine but the ADC took samples at the wrong time The effect is much the same What s worse in this case is that the numbers we ve recorded are now wrong In the previous case we could slap in a better DAC with a jittery ADC the game is over Jitter in AD top and DA bottom converters 6 Jitter Explained ...

Страница 14: ...75 ohm terminated 4 Vpp unterminated 5 5 Vpp Internal intrinsic clock jitter 0 6 ps RMS 10 Hz Clock frequency master mode 44 1 or 48 kHz 25 PPM 5 50 C Maximum ambient temperature for operation 50 C Life expectancy power supply electrolytics 45 000hr Power supply voltage range 20 Fuses 115V fuse 100mA slow blow 230V fuse 50mA slow blow Weight 1 7 kg Dimensions 400 x 40 x 160 mm Power consumption 5 ...

Страница 15: ...nty shall be resolved as prescribed by law To obtain warranty service the purchaser must first call or write Grimm Audio at the address and telephone number printed below to obtain instructions where to send the unit for service All enquiries must be accompanied by a description of the problem All authorized returns must be sent to Grimm Audio or an authorized Grimm Audio repair facility postage p...

Страница 16: ...mm Audio 16 including among other things damage to property damage based on inconvenience or on loss of use of the product and to the extent permitted by law damages for personal injury 8 Grimm Audio Limited Warranty ...

Страница 17: ...Manual CC2 Grimm Audio 17 2019 Grimm Audio BV All rights reserved Reproduction in whole or in part is prohibited Specifications subject to change without notice Grimm Audio CC2 manual v1 1 12 02 19 ...

Страница 18: ...Grimm Audio BV Egelstraat 2 5622 AK Eindhoven The Netherlands 31 40 213 1562 info grimmaudio com www grimmaudio com ...

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