How do you connect a PLL "Lock" LED to the CS8416? - diyAudio
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Old 2nd March 2009, 03:44 PM   #1
G is offline G  United States
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Default How do you connect a PLL "Lock" LED to the CS8416?

I'm going to be building a EZDAC V1.5 and there are no pads to connect a "Lock" LED on the PCB. I downloaded the CS8416 datasheet to see if I could figure out what pin to use for either a hi (3.3v) output or a (Low) AGRD to tie to a LED. After looking at the datasheet I'm more confused than I was before. The CS8416 will be used in "hardware" mode. Any help is appreciated. Here is a link to the schematics:
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Old 3rd March 2009, 06:47 AM   #2
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When a signal is locked, pin 14 goes low. So you basically connect a small current limiting resistor to pin 14, connect the other end to an LED and connect the other end of the LED to the 3.3V supply. For a red (1.8V) LED at 5mA, this means 300 ohms.

For the more adventurous, pin 14 can control a transistor. See here:

In Evan's setup, the 47K resistor to ground (R11) can (should?) stay where it is. The TP version doesn't have this, so you'll have to ask them about it.
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