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# Need help to evaluate op amp consumption on ADA4898-2

Hello,

I would want to know what is the method to evaluate the power consumption of preamp stage. I use a low noise amplifier (ADA4898-2 which is used +6V/-6V supply rails), and I'm not sure to understand the graph figure 4 on the datasheet : Does it means that the ADA4898 could support 3W@30°C for the ADA4898-2, does it means that for the ADA4898-2 that the power dissipation should be divide by 2 to know the power dissipation of one op amp ?

How can I do to estimate the consumption of a stage ? Does it exist a method ?

I hope that someone could help me.

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• Hi Charlyelkhoury,

Thanks a lot for your help.

Well, It helps me to understand the graph, thanks.

Now if I take a simple example :

I have two inverting stage, with a load of 100 ohms with a voltage rails of +6V (VCC) and -6V (VEE)

How can I do to evaluate the power consumption of the amplifier ?

if I consider that the amplifier should be in linear zone, I have a current of 40mA (datasheet), so a power of (VCC*40mA)*2 + 8.7mA*2 ? Can I evaluate it by that way ?

8.7mA is the max Quiescent Current per Amplifier.

regards

Reply
• Hi Charlyelkhoury,

Thanks a lot for your help.

Well, It helps me to understand the graph, thanks.

Now if I take a simple example :

I have two inverting stage, with a load of 100 ohms with a voltage rails of +6V (VCC) and -6V (VEE)

How can I do to evaluate the power consumption of the amplifier ?

if I consider that the amplifier should be in linear zone, I have a current of 40mA (datasheet), so a power of (VCC*40mA)*2 + 8.7mA*2 ? Can I evaluate it by that way ?

8.7mA is the max Quiescent Current per Amplifier.

regards

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