Hello,
I'm working on a device that needs to switch between two AES3 audio channels. For this purpose, I’m considering using the TS5A22362 analog multiplexer.
According to the datasheet, the TS5A22362 supports up to 5.5 Vpp signals, while AES3 signals are typically defined as 2–7 Vpp. Given this, is it still a good idea to use this part, or would you recommend a different solution? If it is fine, should i supply 5V to VDD for the best performance? Will this design be reliable for all types of audio equipment?
I’ve also heard that using relays with gold-plated contacts might offer better performance in terms of jitter. Could you please advise on this?
I'm working on a device that needs to switch between two AES3 audio channels. For this purpose, I’m considering using the TS5A22362 analog multiplexer.
According to the datasheet, the TS5A22362 supports up to 5.5 Vpp signals, while AES3 signals are typically defined as 2–7 Vpp. Given this, is it still a good idea to use this part, or would you recommend a different solution? If it is fine, should i supply 5V to VDD for the best performance? Will this design be reliable for all types of audio equipment?
I’ve also heard that using relays with gold-plated contacts might offer better performance in terms of jitter. Could you please advise on this?
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Thanks Mark, but this solution is costly. Relay should work fine, i guess...
I thought for a moment that it would fit, but it doesn't.
It's 5.5 V peak-peak per line, so 11 V peak-peak differential. The signal voltage range is VDD - 5.5 V up to VDD, so it's only centred around 0 at 2.75 V supply voltage.
However, the AES3 output level is 2 V to 7 V peak-peak differential when measured across a resistor of 110 ohm +/- 1 % without interconnecting cable, according to IEC 60958-4 edition 2.1. When the input that you do not select is left open, the voltage doubles.
You could solve that by terminating the unselected input, but any AES3 receiver is also supposed to accept a 7 V peak common-mode disturbance at any frequency from 0 Hz to 20 kHz on top of the differential signal without any data errors. You would also need to add an AES3 transformer or a filter for each input to keep the voltages within the range of the analogue multiplexer with such a big disturbance.
It seems a lot simpler to just use a TQ2 or similar relay, if the sound of a switching relay is acceptable. It will also be less sensitive to ESD and latch-up.
That sounds likely, but S/PDIF and AES3 are not low jitter anyway.