Looking for a IC simmilar to DRV134 - but single supply

[bastibasti]

Hi,

I have a single ended input, and I need to convert it to differential. However, I only have single supply. So My desired output signal is idling at Vcc/2 and then differentiates according to the input signal.

Does anyone an integrated circuit to do this?

 

[abraxalito]

TDA8541

 

[sgrossklass]

Clever, a little BTL audio amp as balanced line driver. That one looks like it could have decent noise levels even. Distortion is obviously going to be much better than in a speaker application, though possibly not up to the standards of a dedicated line driver.

If minimum space and cost were of no concern, I'd simply go with one of the usual split supply circuits plus a virtual ground though. A TLE2426 rail splitter should be plenty. V+ on the DRV134 connects to +Vcc, V- to RealGnd, and Gnd to +Vcc/2 from rail splitter - should work, shouldn't it?

 

[JMFahey]

Hi,

I have a single ended input, and I need to convert it to differential. However, I only have single supply. So My desired output signal is idling at Vcc/2 and then differentiates according to the input signal.

Does anyone an integrated circuit to do this?

ANY (as in ANY) Op Amp.
You get a dual Op Amp, bias it at 1/2Vcc , use one as unity gain buffer, the other driven from that output as unity gain inverter, both inputs will be within a couple mV from each other floating at 1/2Vcc ... what the Doctor ordered 😉

This is the basic idea but both + inputs should be referenced to 1/2Vcc instead of ground and Op Amp power pins connected to +Vcc and ground, instead of +Vcc and -Vcc

This is a slightly more elaborate one, already adapted to single supply, just see it at Rod Elliot's *excellent* site, chock full of practical, no nonsense advice:
ESP - Direct Injection Box for Recording and PA Systems

 

[AndrewT]

Noise may be the problem.
They specify max as 100uV.
The THD+N bottom out at either 0.1% or 0.06% for the 16r loading and then slope up presumably due to the noise contribution at the lower signal levels.

Is 100uV equivalent to 23nV/rootHz?

23nV * 30gain * sqrt(20000) = 98uV

 

[Speedskater]

Note that XLR pin 1 is not connected to the audio circuit common/ground. It is connected to the chassis to act as a shield.

 

[BrianL]

There is no reason why you can't use the DRV134 with a single supply. Just connect the 'gnd' pin to half the supply voltage with low impedance ac connection to ground

 

[bastibasti]

Hi everyone,

thanks for pointing out the possibilities. I will order a drv134 and a good quality opamp - to give the possibilities a try ... I am sure I will come back and ask more questions..