LTC1590

[LJYS]

I would like to ask:

LTC1590 Is there a way to use fixed output without soft control?
Because I don't write soft controls .
Thank you

 

[altor]

For what do you want to use it?

 

[Markw4]

How do you know it won't write with soft controls? What have you tried?

 

[LJYS]

It should be wrong

Because I don't write soft controls

Sorry

 

[LJYS]

For what do you want to use it?

Used for volume control

 

[rfbrw]

You can control it with a hardware only solution but it requires the same level of understanding as it would take to do it in software.

 

[Mark Tillotson]

You'd need to find a parallel input multiplying DAC to be able to configure it statically.

 

[altor]

Used for volume control

You need micro-controller to translate the volume level from your control to SPI.
Or to choose another MDAC, with parallel bus, as were mentioned above.

BTW, I also use LTC1590f as a volume control in some products.
Also DAC8803 and DAC8814.

 

[LJYS]

You can control it with a hardware only solution but it requires the same level of understanding as it would take to do it in software.

I would like to ask:
How to control it with a hardware solution?
What hardware control should be used?
Is there a line for reference?

 

[rfbrw]

It can be done in hardware but would need quite a bit of discrete logic or a CPLD. It would be so much easier to do it in software. There is probably some Arduino code out there you can modify. That being said here is one way it might be done in hardware

1. Set values for both dacs.
Set the inputs on 24 bit parallel in, serial out shift register. Setting the values can be as simple as 24 switches or something with a digipot and a display.
2. Load values and convert.
Generate a low going signal starting a 24 cycle count. After 24 cycles the signal goes high updating dac the output and resetting the 24 cycle counter.