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Amplifier selection should be optimised to fit the application. As stated previously, the reference buffer for a voltage DAC should be a low noise and low offset error amplifier, as offset errors in the reference buffer will transfer to gain errors at the output of the DAC. At the output of the DAC, there are a number of questions to consider: Is faster settling time or higher bandwidth required, or is greater precision and lower noise needed? Cost, package size, and number of required channels needs to be considered as well. Many of these trade-offs can be analysed in Analog Devices’ web based amplifier search tool. In general, DAC switches settle very quickly. Consequently, the slew rate and settling time of a DAC circuit is determined largely by the output amplifier. In general, amplifiers with low bias currents, low offset errors, and sufficient headroom should be chosen. If more precision is needed then choose from lower noise amplifiers. For higher speeds, choose amplifiers with a faster settling time, faster slew rate, and higher bandwidth. In the end, the decision of which amplifier to select is going to be application dependent.
