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AD8397ARDZ Datasheet(PDF) 11 Page - Analog Devices |
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AD8397ARDZ Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page AD8397 Rev. 0 | Page 11 of 16 GENERAL DESCRIPTION The AD8397 is a voltage feedback operational amplifier which features an H-bridge input stage and common-emitter, rail-to- rail output stage. The AD8397 can operate from a wide supply range, ±1.5 V to ±12 V. When driving light loads, the rail-to-rail output is capable of swinging to within 0.2 V of either rail. The output can also deliver high linear output current when driving heavy loads, up to 310 mA into 32 Ω while maintaining −80 dBc SFDR. The AD8397 is fabricated on Analog Devices’ proprietary eXtra Fast Complementary Bipolar High Voltage process (XFCB-HV). POWER SUPPLY AND DECOUPLING The AD8397 can be powered with a good quality, well- regulated, low noise supply from ±1.5 V to ±12 V. Careful attention should be paid to decoupling the power supply. High quality capacitors with low equivalent series resistance (ESR), such as multilayer ceramic capacitors (MLCCs), should be used to minimize the supply voltage ripple and power dissipation. A 0.1 µF MLCC decoupling capacitor(s) should be located no more than 1/8 inch away from the power supply pin(s). A large tantalum 10 µF to 47 µF capacitor is recommended to provide good decoupling for lower frequency signals and to supply current for fast, large signal changes at the AD8397 outputs. LAYOUT CONSIDERATIONS As with all high speed applications, careful attention should be paid to printed circuit board (PCB) layout in order to prevent associated board parasitics from becoming problematic. The PCB should have a low impedance return path (or ground) to the supply. Removing the ground plane from all layers in the immediate area of the amplifier helps to reduce stray capacitan- ces. The signal routing should be short and direct in order to minimize the parasitic inductance and capacitance associated with these traces. Termination resistors and loads should be located as close as possible to their respective inputs and outputs. Input traces should be kept as far apart as possible from the output traces to minimize coupling (crosstalk) though the board. When the AD8397 is configured as a differential driver, as in some line driving applications, a symmetrical layout should be provided to the extent possible in order to maximize balanced performance. When running differential signals over a long distance, the traces on the PCB should be close together or any differential wiring should be twisted together to minimize the area of the inductive loop that is formed. This reduces the radiated energy and makes the circuit less susceptible to RF interference. Adherence to stripline design techniques for long signal traces (greater than approximately 1 inch) is recommended. UNITY-GAIN OUTPUT SWING When operating the AD8397 in a unity-gain configuration, the output does not swing to the rails and is constrained by the H-bridge input. This can be seen by comparing the output overdrive recovery in Figure 7 and the input overdrive recovery in Figure 22. To avoid overdriving the input and to realize the full swing afforded by the rail-to-rail output stage, the amplifier should be used in a gain of two or greater. INPUT OUTPUT 7 –1 0 1 0 80 160 240 320 400 TIME (ns) 480 560 640 720 800 2 3 4 5 6 Figure 22. Unity-Gain Input Overdrive Recovery |
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