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AD713JRZ16 Fiches technique(PDF) 13 Page - Analog Devices |
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AD713JRZ16 Fiches technique(HTML) 13 Page - Analog Devices |
13 / 20 page AD713 Rev. F | Page 13 of 20 loop gain. At high frequencies, where the loop gain is low, the amplifier output impedance can approach its open-loop value. STS 1 (MSB) DB11 HIGH BITS MIDDLE BITS LOW BITS (LSB) DB0 2 DB10 3 DB9 4 28 27 AO 26 25 DB8 5 DB7 6 DB6 7 CE 24 REF OUT 23 AC 22 DB5 8 REF IN 21 DB4 9 VEE 20 DB3 10 BIP OFF 19 DB2 11 10VIN 18 DB1 12 VLOGIC 17 13 VCC 16 DC 14 20VIN 15 AD574A TOP VIEW (Not to Scale) 12/8 CS R/C GAIN ADJUST ±10V ANALOG INPUT R2 100Ω R1 100Ω OFFSET ADJUST ANALOG COM 1/4 AD713 +15V 0.1µF 4 –15V 0.1µF 11 Figure 37. AD713 as an ADC Buffer Most IC amplifiers exhibit a minimum open-loop output imped- ance of 25 Ω, due to current limiting resistors. A few hundred microamps reflected from the change in converter loading can introduce errors in instantaneous input voltage. If the analog- to-digital conversion speed is not excessive and the bandwidth of the amplifier is sufficient, the amplifier output returns to the nominal value before the converter makes its comparison. However, many amplifiers have relatively narrow bandwidths, yielding slow recovery from output transients. The AD713 is ideally suited as a driver for ADCs because it offers both a wide bandwidth and a high open-loop gain. ••• • • • • • • • • • ••• • • • • • ••• • ••• • ••• • ••• • ••• • ••• • • • • • • • • • ••• • • • • • ••• • ••• • ••• • ••• • ••• • 100 90 10 0% 1mV AD713 BUFF 200ns 500mV 10V ADC IN Figure 38. Buffer Recovery Time Source Current = 2 mA •• • • • • • • • •• • • •• • • •• • • •• • • •• • • •• • • •• • • •• • •• • • • • • • • •• • • •• • • •• • • •• • • •• • • •• • • •• • • •• • 100 90 10 0% 1mV AD713 BUFF 200ns 500mV –5V ADC IN Figure 39. Buffer Recovery Time Sink Current = 1 mA Driving A Large Capacitive Load The circuit of Figure 40 uses a 100 Ω isolation resistor that enables the amplifier to drive capacitive loads exceeding 1500 pF; the resistor effectively isolates the high frequency feedback from the load and stabilizes the circuit. Low frequency feedback is returned to the amplifier summing junction via the low-pass filter formed by the 100 Ω series resistor and the load capacitance, CL. Figure 41 shows a typical transient response for this connection. +VS –VS 1/4 AD713 4 11 0.1µF 30pF 4.99kΩ 4.99kΩ CL RL 100Ω 0.1µF OUTPUT INPUT TYPICAL CAPACITANCE LIMIT FOR VARIOUS LOAD RESISTORS RL 2kΩ 10kΩ 20kΩ CL UP TO 1500pF 1500pF 1000pF Figure 40. Circuit for Driving a Large Capacitance Load ••• • ••• • • • • • • •• • ••• • ••• • ••• • ••• • ••• • ••• • ••• • ••• • • • • • • •• • ••• • ••• • ••• • ••• • ••• • ••• • 100 90 10 0% 5V 1µs Figure 41. Transient Response, RL = 2 kΩ, CL = 500 pF |
Numéro de pièce similaire - AD713JRZ16 |
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Description similaire - AD713JRZ16 |
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