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AD744 Datasheet(PDF) 9 Page - Analog Devices |
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AD744 Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page REV. C AD744 –9– Table II. Recommended Values of CCOMP vs. Various Load Conditions for the Circuits of Figures 31 and 32. Max Slew –3 dB R1 R2 Gain Gain CLOAD CCOMP CLEAD Rate Bandwidth ( )( ) Follower Inverter (pF) (pF) (pF) (V/ s) (MHz) 4.99 k 4.99 k 2 1 50 0 7 75 2.5 1 4.99 k 4.99 k 2 1 150 5 7 37 2.31 4.99 k 4.99 k 2 1 1000 20 – 14 1.2 4.99 k 4.99 k 2 1 >2000 25 – 12.5 2 1.0 499 Ω 4.99 k 11 10 270 0 – 75 1.2 499 Ω 4.99 k 11 10 390 2 – 50 0.85 499 Ω 4.99 k 11 10 1000 5 – 37 2 0.60 NOTES 1Bandwidth with C LEAD adjusted for minimum settling time. 2Into large capacitive loads the AD744’s 25 mA output current limit sets the slew rate of the amplifier, in V/ µs, equal to 0.025 amps divided by the value of CLOAD in µF. Slew rate is specified into rated max C LOAD except for cases marked 2, which are specified with a 50 pF. load. AD744 1 F 0.1 F –VS CCOMP 1 F 0.1 F +VS VOUT VIN OPTIONAL R2* CLEAD* R1* *SEE TABLE II Figure 32. AD744 Connected as an Inverting Amplifier Operating at Gains of 1 or Greater Using Decompensation to Extend the Gain Bandwidth Product When the AD744 is used in applications where the closed-loop gain is greater than 10, gain bandwidth product may be enhanced by connecting a small capacitor between Pins 1 and 5 (Figure 33). At low frequencies, this capacitor cancels the effects of the chip’s internal compensation capacitor, CCOMP, effectively dec- ompensating the amplifier. Due to manufacturing variations in the value of the internal CCOMP, it is recommended that the amplifier’s response be optimized for the desired gain by using a 2 to 10 pF trimmer capacitor rather than using a fixed value. \ AD744 1 F 0.1 F –VS 1 F 0.1 F +VS VOUT VIN NOT CONNECTED R2* R1* 2 – 10pF *SEE TABLE III Figure 33. Using the Decompensation Connection to Extend Gain Bandwidth Table III. Performance Summary for the Circuit of Figure 33 R1 R2 Gain Gain –3 dB Gain/BW ( )( ) Follower Inverter Bandwidth Product 1 k 10 k 11 10 2.5 MHz 25 MHz 100 10 k 101 100 760 kHz 76 MHz 100 100 k 1001 1000 225 kHz 225 MHz |
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