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MAX4042EUA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4042EUA Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page Single/Dual/Quad, Low-Cost, SOT23, Micropower, Rail-to-Rail I/O Op Amps ______________________________________________________________________________________ 11 For example, a MAX4040 running from a single +2.4V supply, operating at TA = +25°C, can source 240µA to within 100mV of VCC and is capable of driving a 9.6k Ω load resistor to VEE: The same application can drive a 4.6k Ω load resistor when terminated in VCC / 2 (+1.2V in this case). Driving Capacitive Loads The MAX4040–MAX4044 are unity-gain stable for loads up to 200pF (see Load Resistor vs. Capacitive Load graph in Typical Operating Characteristics ). Applications that require greater capacitive drive capa- bility should use an isolation resistor between the output and the capacitive load (Figures 6a–6c). Note that this alternative results in a loss of gain accuracy because RISO forms a voltage divider with the load resistor. Power-Supply Bypassing and Layout The MAX4040–MAX4044 family operates from either a single +2.4V to +5.5V supply or dual ±1.2V to ±2.75V supplies. For single-supply operation, bypass the power supply with a 100nF capacitor to VEE (in this case GND). For dual-supply operation, both the VCC and VEE supplies should be bypassed to ground with separate 100nF capacitors. Good PC board layout techniques optimize perfor- mance by decreasing the amount of stray capacitance at the op amp’s inputs and output. To decrease stray capacitance, minimize trace lengths by placing exter- nal components as close as possible to the op amp. Surface-mount components are an excellent choice. Using the MAX4040–MAX4044 as Comparators Although optimized for use as operational amplifiers, the MAX4040–MAX4044 can also be used as rail-to-rail I/O comparators. Typical propagation delay depends on the input overdrive voltage, as shown in Figure 7. External hysteresis can be used to minimize the risk of output oscillation. The positive feedback circuit, shown in Figure 8, causes the input threshold to change when the output voltage changes state. The two thresholds create a hysteresis band that can be calculated by the following equations: VHYST = VHI - VLO VLO = VIN x R2 / (R1 + (R1 x R2 / RHYST) + R2) VHI = [(R2 / R1 x VIN) + (R2 / RHYST) x VCC] / (1 + R1 / R2 + R2 / RHYST) R = 2.4V - 0.1V 240 A 9.6k to V L EE µ = Ω 50mV/div IN OUT 50mV/div MAX4040/42/44 fig06b 100 µs/div RISO = NONE, RL = 100kΩ, CL = 700pF Figure 6b. Pulse Response without Isolating Resistor 50mV/div IN OUT 50mV/div MAX4040/42/44 fig06c 100 µs/div RISO = 1kΩ, RL = 100kΩ, CL = 700pF Figure 6c. Pulse Response with Isolating Resistor RISO CL RL MAX4040– MAX4044 AV = RL ≈ 1 RL + RISO Figure 6a. Using a Resistor to Isolate a Capacitive Load from the Op Amp |
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