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MAX4321 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4321 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp 8 _______________________________________________________________________________________ Rail-to-Rail Output Stage The minimum output voltage will be within millivolts of ground for single-supply operation where the load is referenced to ground (VEE). Figure 3 shows the input voltage range and output voltage swing of a MAX4321 connected as a voltage follower. With a +3V supply and the 100k Ω load tied to ground, the output swings from 0.02V to 2.97V. The maximum output voltage swing depends on the load but will be within 300mV of a +5V supply, even with the maximum load (250 Ω to ground). Driving a capacitive load can cause instability in most high-speed op amps, especially those with low quies- cent current. The MAX4321 has a high tolerance for capacitive loads. It is stable with capacitive loads up to 500pF. Figure 4 gives the stable operating region for capacitive loads. Figures 5 and 6 show the response with capacitive loads and the results of adding an isola- tion resistor in series with the output (Figure 7). The resistor improves the circuit’s phase margin by isolating the load capacitor from the op amp’s output. Figure 3. Rail-to-Rail Input /Output Voltage Range Figure 4. Capacitive-Load Stability Figure 5. Small-Signal Transient Response with Capacitive Load Figure 6. Transient Response to Capacitive Load with Isolation Resistor IN 400ns/div OUT AV = +1 CL = 500pF IN 400ns/div OUT AV = +1 CL = 1000pF RS = 39 Ω IN 2 µs/div OUT VCC = 3V AV = +1 RL = 100k Ω 10,000 100 100 1k 100k 10k RESISTIVE LOAD ( Ω) 1000 UNSTABLE REGION RL TO VEE VOUT = VCC / 2 |
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