Datasheet AD746 (Analog Devices) - 6

AD746 POWER SUPPLY BYPASSING
(with short lead lengths to power supply common) will assure The power supply connections to the AD746 must maintain a adequate high frequency bypassing, in most applications. A low impedance to ground over a bandwidth of 13 MHz or more. minimum bypass capacitance of 0.1 µF should be used for any This is especially important when driving a significant resistive application. or capacitive load, since all current delivered to the load comes If only one of the two amplifiers inside the AD746 is to be from the power supplies. Multiple high quality bypass capacitors utilized, the unused amplifier should be connected as shown in are recommended for each power supply line in any critical Figure 21a. Note that the noninverting input should be application. A 0.1 µF ceramic and a 1 µF tantalum capacitor as grounded and that RL and CL are not required. shown in Figure 20 placed as close as possible to the amplifier Figure 20. Power Supply Figure 19. THD Test Circuit Bypassing Figure 21a. Gain of 2 Follower Figure 21b. Gain of 2 Follower Figure 21c. Gain of 2 Follower Large Signal Pulse Response Small Signal Pulse Response Figure 22a. Unity Gain Inverter Figure 22b. Unity Gain Inverter Figure 22c. Unity Gain Inverter Large Signal Pulse Response Small Signal Pulse Response –6– REV. B