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The minimum sample time for one channel in a data acqui- sition system is usually considered to be the acquisition time of the sample/hold plus the conversion time of the A/D converter. If two or more sample/holds are used with a multiplexer (such as the Burr-Brown MPC800 0r MPC801) as shown in Figure 12, the acquisition time of the sample/ hold can be virtually eliminated. While the first channel is in hold and switched into the A/ D converter, the multiplexer may be addressed to the next channel. The second sample/ hold will have acquired this signal by the time the conver- sion is complete. Then, the sample/holds reverse roles and another channel is addressed. In low level systems an instru- mentation amplifier (such as the Burr-Brown INA101) and a differential multiplexer (such as the Burr-Brown MPC509A or MPC507A) may be required in front of the sample/hold. The settling and acquisition times ofthe multiplexer, instru- mentation amplifier, and sample/hold can be eliminated from the total conversion time as before by operating in this overlapped mode with the sample/holds.