ADA4940-1Production
The ADA4940-1 / ADA4940-2 are low noise, low distortion differential amplifiers with very low power consumption. They are an ideal choice for driving low...
Datasheet ADA4940-1 on Analog.com
ADA4941-1Production
The ADA4941-1 is a low power, low noise differential driver for
analog-to-digital converters (ADCs) up to 18 bits in systems
that are sensitive to power...
Datasheet ADA4941-1 on Analog.com
That’s a great question. There's actually quite a few similarities and differences between the two let’s take a look at a few of them.
Where they are similar
They both feature a differential inputs and outputs.
They both can be operated single ended in and differential out.
They are both low power.
They are both commonly used for driving low power ADC's
Where they are different
The ADA4940-1 features a fully differential output, that means its amplitude and phase are equal and opposite
The ADA4941-1 has a complementary output, but is output is not phase matched
The ADA4940-1 input impedance is relatively low and determined by the input resistors and the gain of the amplifier.
The ADA4941-1 has a very high input impedance (it’s actually a dual op dual with on chip resistors for the second inverting stage G=-1)
The ADA4940-1 features our dedicated feedback pin which really helps in streamlining layout; the ADA4941-1 does not.
The ADA4940-1 has a supply current of 1.25mA, whereas the ADA4941-1 has a supply current of 2.2mA
The ADA4940-1 has a small signal BW of 260MHz and supports 12bits at 1MHz
The ADA4941-1 has a small signal BW of 32MHz and supports 12bits at 100 KHz.
Well those are a lot of the major similarities and differences, I hope this helps understand the two parts a little better and as always for more detailed information please see the datasheet.
