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Author Topic: -5V (negative voltage) via DC/DC converter for AD1856 (16bit audio DAC)  (Read 2528 times)
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cologne, germany
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Hello,
I want to connect an AD1856 (16bit audio DAC) to my Arduino UNO. The AD1856 needs +5V and -5V as supply voltage. To get the negative voltage I will try to use a "Aimtec AM1S-0505SZ" DC/DC converter.
To test the DC/DC converter I connected the "-V Input" to GND and the "+V Input" to +5V.
Then I measured the voltage between "-V Output" and "+V Output" and got 5V (as expected), but when I measured the voltage between "-V Output" and +5V I don't get 10V (5V - [-5V] = 10V), but 0V!?
What's wrong?
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With DC/DC converters the outputs are usually isolated from the inputs. You probably need to connect the -V input to the +V output pin. (To be on the safe side, start off by connecting -V input and +V output with a low value resistor, then measure the voltage between +5v and -V output. If you get 10V, it works, and you can replace the resistor with a wire)
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Yes, you should connect +Voutput to -Vinput, and then -Voutput will be -5V. But this module is a bit of overkill. You can just use a charge-pump inverter (e.g., TC7660) to get your -5V.

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...yes, that works, thank you!
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