Question data sheet for AD7678 says that its input driver must settle fast and be short circuit limited if its using different rails to the single rail ADC. It recommends the AD8021 for its performance. - But its by no means short circuit protected! - Can you recommend a suitable high performance driver that IS suitably protected? Answer The AD7678 specifies an input buffer with a short-circuit current limitation. Looking at the AD8021 datasheet, the output is limited to 75mA when used on +/-5V supply (the maximum required for the AD7678) and the power dissipation is within the limits of the device over the entire temperature range. It is only on supplies of +/-12V where the maximum output current could begin to cause a problem for the ADC inut protection diodes and where the power dissipation of the device could cause the die temperature to exceed its maximum ratings. The AD8021 offers excellent performance for the device and its interaction with the AD7678 input protection diodes is suitable for most realistic applications. The AD8139 was not released when the AD7678 was released, but it would be a suitable differential driver for the ADC.

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AD7678 Production
The AD7678 is an 18-bit, 100 kSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates on a single 5 V power supply...
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AD7678 on Analog.com