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MAX4232AKA+T Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4232AKA+T Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 27 page To improve step response when R ′ > 2kΩ, connect small capacitor Cf between the inverting input and out- put. Choose Cf as follows: Cf = 8(R / Rf) [pf] where Rf is the feedback resistor and R is the gain-set- ting resistor (Figure 5). Driving Capacitive Loads The MAX4230–MAX4234 have a high tolerance for capacitive loads. They are stable with capacitive loads up to 780pF. Figure 6 is a graph of the stable operating region for various capacitive loads vs. resistive loads. Figures 7 and 8 show the transient response with excessive capacitive loads (1500pF), with and without the addition of an isolation resistor in series with the output. Figure 9 shows a typical noninverting capaci- tive-load-driving circuit in the unity-gain configuration. High-Output-Drive, 10MHz, 10V/µs, Rail-to-Rail I/O Op Amps with Shutdown in SC70 ______________________________________________________________________________________ 11 MAX4230 VIN VOUT R ′ = R || Rf RfCf = RCIN Rf Cf R INVERTING MAX4230 VIN VOUT R ′ = R || Rf RfCf = RCIN Rf R Cf NONINVERTING Figure 5. Inverting and Noninverting Amplifiers with Feedback Compensation 0 500 1500 1000 2000 2500 1 100 10 1k 10k 100k RESISTIVE LOAD ( Ω) VDD = 5.0V RL TO VDD/2 STABLE UNSTABLE Figure 6. Capacitive-Load Stability 1 μs/div 20mV/div 20mV/div VDD = 3.0V, CL = 1500pF RL = 100k Ω, RISO = 39Ω Figure 8. Small-Signal Transient Response with Excessive Capacitive Load with Isolation Resistor 1 μs/div 20mV/div 20mV/div VDD = 3.0V, CL = 1500pF RL = 100k Ω, RISO = 0Ω Figure 7. Small-Signal Transient Response with Excessive Capacitive Load |
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