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BUF634A: Increase slew rate of DAC7811 with BUF634a

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Part Number: BUF634A

Hi.

I am using DAC7811EVM board.

I would like to increase the slew rate of DAC7811 output.

OPA 2277 on the evaluation board has a low slew rate.

So, I chose BUF634a with a high slew rate.

Which of the following two is the correct circuit configuration when combined with the evaluation board?
(Or are both configurations wrong?)
①.Swap OPA 2277 and BUF634a as shown below.
②.Add BUF634a after OPA2277 as shown below.
I thought that ② was limited by the SR of OPA2277, so the rise / fall time would not change even if BUF634a was added.
Therefore, I connected the DAC7811 evaluation board and the BUF634a evaluation board with jumper wires as shown in ① configuration.
But, no voltage was output.
Best Regard

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