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AD845JR-16-REEL7 Fiches technique(PDF) 7 Page - Analog Devices |
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AD845JR-16-REEL7 Fiches technique(HTML) 7 Page - Analog Devices |
7 / 12 page AD845 REV. E –7– MEASURING AD845 SETTLING TIME Figure 1 shows AD845 settling time performance. This measure- ment was accomplished by driving the amplifier in the unity gain inverting mode with a fast pulse generator. The input summing junction was measured using false nulling techniques. Settling time is defined as the interval of time from the application of an ideal step function input until the closed-loop amplifier output has entered and remains within a specified error band. Components of settling time include: 1. Propagation time through the amplifier 2. Slewing time to approach the final output value 3. Recovery time from overload associated with the slewing 4. Linear settling to within a specified error band These individual components can be seen easily in Figure 1. Settling time is extremely important in high speed applications where the current output of a DAC must be converted to a voltage. When driving a 500 W load in parallel with a 100 pF capacitor, the AD845 settles to 0.1% in 250 ns and to 0.01% in 310 ns. Figure 1. Settling Characteristics 0 V to 10 V Step Upper Trace: Output of AD845 Under Test (5 V/Div) Lower Trace: Error Voltage (1 mV/Div) Figure 2. Settling Time Test Circuit A HIGH SPEED INSTRUMENTATION AMP The 3-op amp instrumentation amplifier circuit shown in Figure 3 can provide a range of gains from unity up to 1000 and higher. The instrumentation amplifier configuration features high common-mode rejection, balanced differential inputs, and stable, accurately defined gain. Low input bias currents and fast settling are achieved with the FET input AD845. Most monolithic instrumentation amplifiers do not have the high frequency performance of the circuit in Figure 3. The cir- cuit bandwidth is 10.9 MHz at a gain of 1 and 8.8 MHz at a gain of 10; settling time for the entire circuit is 900 ns to 0.01% for a 10 V step (Gain = 10). The capacitors employed in this circuit greatly improve the amplifier’s settling time and phase margin. Figure 3. High Performance, High Speed Instrumentation Amplifier Table I. Performance Summary for the 3-Op Amp Instrumentation Amplifier Circuit 3-Op Amp In-Amp Small Signal Settling Time Gain RG Bandwidth to 0.01% 1Open 10.9 MHz 500 ns 22 k W 8.8 MHz 500 ns 10 226 W 2.6 MHz 900 ns 100 20 W 290 kHz 7.5 ms Note: Resistors around the amplifiers’ input pins need to be small enough in value so that the RC time constant they form, with stray circuit capacitance, does not reduce circuit bandwidth. Figure 4. The Pulse Response of the 3-Op Amp Instrumentation Amplifier. Gain = 1, Horizontal Scale = 0.5 ms/Div and Vertical Scale = 5 V/Div. |
Numéro de pièce similaire - AD845JR-16-REEL7 |
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Description similaire - AD845JR-16-REEL7 |
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