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MAX4168 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4168 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page High-Output-Drive, Precision, Low-Power, Single- Supply, Rail-to-Rail I/O Op Amps with Shutdown ______________________________________________________________________________________ 11 Since the input stage switches between the NPN and PNP pairs, the input bias current changes polarity as the input voltage passes through the transition region. Match the effective impedance seen by each input to reduce the offset error caused by input bias currents flowing through external source impedances (Figures 4 and 5). High source impedances, together with input capaci- tance, can create a parasitic pole that produces an underdamped signal response. Reducing the input impedance or placing a small (2pF to 10pF) capacitor across the feedback resistor improves response. The MAX4165–MAX4169’s inputs are protected from large differential input voltages by 1k Ω series resistors and back-to-back triple diodes across the inputs (Figure 6). For differential voltages less than 1.8V, input resistance is typically 500k Ω. For differential input voltages greater than 1.8V, input resistance is approximately 2k Ω. The input bias current is given by the following equation: IBIAS = (VDIFF - 1.8V) / 2k Ω Rail-to-Rail Output Stage The minimum output is within millivolts of ground for single-supply operation, where the load is referenced to ground (VEE). Figure 7 shows the input voltage range and the output voltage swing of a MAX4165 connected as a voltage follower. The maximum output voltage swing is load dependent; however, it is guaranteed to be within 430mV of the positive rail (VCC = 5V) even with maximum load (25 Ω to ground). Driving Capacitive Loads The MAX4165–MAX4169 have a high tolerance for capacitive loads. They are stable with capacitive loads up to 250pF. Figure 8 is a graph of the stable operating region for various capacitive loads vs. resistive loads. Figures 9 and 10 show the transient response with excessive capacitive loads (1500pF), with and without the addition of an isolation resistor in series with the output. Figure 11 shows a typical noninverting capaci- tive-load-driving circuit in the unity-gain configuration. The resistor improves the circuit’s phase margin by iso- lating the load capacitor from the op amp’s output. 1k 1k Figure 6. Input Protection Circuit IN (1V/div) OUT (1V/div) TIME (5 µs/div) VCC = +3.0V RL = 100kΩ Figure 7. Rail-to-Rail Input/Output Range |
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