INA1650: I'm interested in configuring these amplifiers for single ended input and single ended output.

Reparadise said:

Part Number: INA1650

I'm looking at the data sheet right now for the INA1650.  Should I use the single ended design (Fig. 59 in the data sheet)  for the single power supply with a dual supply?  Is there an easier way to do this?  I think I might still get some sort of mismatch with the reactive and resistive inputs impedances.  I'm also looking at the development board and don't understand the single ended input configuration.  

Hi,

It really depends on the available power supplies you have on your board. If you only have positive supplies then its best to keep to single supply and connect VEE to the ground as they have in Fig 59.

The circuit in Fig 59 is a little special for it aims to eliminate potential ground loops, but this may not be your main problem ... Sound like you just wanna use an audio amplifier for something, no ?

You can use the single supply case, with VCC = +V, VEE = 0V and VREF connected to +V/2 (this later you have to provide yourself and as it says in the datasheet, should be from a low impedance source ... may need to look at a voltage reference for that, or simple voltage divider with bypass capacitor etc). Then your INA+ and INA- connect each through 2 capacitors to your source signal, and your output becomes single-ended common-mode output.

This INA1650 is especially made to convert differential input audio to single-ended output, and you need to consider if this is what you need. It would be a waste to use it for single-ended input to single-ended output with one supply.

Hope this helps you out for whatever you're trying to do.

Cheers, Citizen

Hi Reparadise,

You can follow the schematic in figure 59, wiring will look something like this:

-Tamara