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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: RE: Slew rate. posted by rick_m on June 1, 2012 at 07:21:42:
Hi Rick,I believe that the digital input receiver switching threshold sensitivity is indeed the same, at 200mV, between the AES3 ( balanced), and the AES3id (single ended, aka S/PDIF) formats. The driver amplitude specs. greatly differ, however, with balanced transmission levels being anywhere from 2V to 7V pk-pk, while single ended is typically 500mV pk-pk. I can only assume that such a large dynamic range is included in the balanced spec. for reason of enabling greater noise immunity in professional applications.
It will take several times longer for a 2V - 7V drive signal to switch/slew back through that 200mV reciever threshold, than it would for a 500mV drive signal. Longer signal switching times contribute to jitter. While a differential driver would have twice the slew rate of an single ended driver, an AES3 compliant signal will force the differential driver to swing at least four times the voltage. So, the differential driver travels twice as fast, but also must travel at least four times as far.
As far as LVDS is concerned, swinging lower amplitude voltages reduces EMI/RFI, and also increases the driver data rate/bandwidth. Think of it in terms of the gain-bandwidth product of the driver circuit. Lower gain due to reduced output signal amplitude requirements affords greater signal bandwidth.
_
Ken Newton
Edits: 06/01/12
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Follow Ups
- RE: Slew rate. - knewton 13:07:30 06/01/12 (15)
- RE: Slew rate. - Bromo33333 06:48:39 06/06/12 (0)
- RE: Slew rate. - rick_m 18:39:26 06/01/12 (9)
- RE: Slew rate. - knewton 19:35:49 06/01/12 (8)
- RE: Slew rate. - rick_m 08:22:51 06/02/12 (7)
- RE: Slew rate. - knewton 11:41:32 06/02/12 (3)
- RE: Slew rate. - rick_m 18:08:35 06/02/12 (0)
- Higher slew rates can make interface jitter worse - slider 12:54:21 06/02/12 (1)
- RE: Higher slew rates can make interface jitter worse - knewton 05:16:43 06/03/12 (0)
- RE: Slew rate. - Tony Lauck 10:17:04 06/02/12 (2)
- RE: Slew rate. - rick_m 14:07:12 06/02/12 (1)
- RE: Slew rate. - Tony Lauck 17:16:18 06/02/12 (0)
- RE: Slew rate. - John Swenson 15:34:49 06/01/12 (3)
- RE: Slew rate. - Tony Lauck 10:07:55 06/02/12 (0)
- RE: Slew rate. - knewton 16:17:34 06/01/12 (1)
- RE: Slew rate. - tonyptony 16:26:03 06/02/12 (0)
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