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AD688BQ Datasheet(PDF) 6 Page - Analog Devices |
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AD688BQ Datasheet(HTML) 6 Page - Analog Devices |
6 / 8 page AD688 REV. A –6– Duplication of these results requires a combination of high accuracy and stable temperature control in a test system. Evaluation of the AD688 will produce curves similar to those in Figure 7, but output readings may vary depending on the test methods and equipment utilized. KELVIN CONNECTIONS Force and sense connections, also referred to as Kelvin connec- tions, offer a convenient method of eliminating the effects of voltage drops in circuit wires. As seen in Figure 9a, the load Figure 9. Advantage of Kelvin Connection current and wire resistance produce an error (VERROR = R × IL) at the load. The Kelvin connection of Figure 9b overcomes the problem by including the wire resistance within the forcing loop of the amplifier and sensing the load voltage. The amplifier corrects for any errors in the load voltage. In the circuit shown, the output of the amplifier would actually be at 10 volts + VERROR and the voltage at the load would be the desired 10 volts. The AD688 has three amplifiers which can be used to imple- ment Kelvin connections. Amplifier A2 is dedicated to the ground force-sense function while uncommitted amplifiers A3 and A4 are free for other force-sense chores. In some applications, one amplifier may be unused. In such cases, the unused amplifier should be connected as a unity-gain follower (force and sense pins tied together) and the input should be connected to ground. An unused amplifier may be used for other circuit functions as well. The curves on this page show the typical performance of A3 and A4. A3, A4 CMR vs. Frequency A3, A4 Open-Loop Frequency Response A3, A4 PSR vs. Frequency Input Noise Voltage Spectral Density Unity-Gain Follower Pulse Response (Large Signal) Unity-Gain Follower Pulse Response {Small Signal) DYNAMIC PERFORMANCE The output buffer amplifiers (A3 and A4) are designed to pro- vide the AD688 with static and dynamic load regulation superior to less complete references. Many A/D and D/A converters present transient current loads to the reference, and poor reference response can degrade the converter’s performance. Figure 10 displays the characteristic of the AD688 output amplifier driving a 0-to-10 mA load. Figure 10a. Transient Load Test Circuit |
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