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MAX4219EEE Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4219EEE Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page As the load resistance decreases, the useful input range is effectively limited by the output drive capability, since the buffers have a fixed voltage gain of +2V/V or -1V/V. For example, a 50 Ω load can typically be driven from 40mV above VEE to 1.6V below VCC, or 40mV to 3.4V when operating from a single +5V supply. If the buffer is operated in the noninverting, gain of +2V/V configu- ration with the inverting input grounded, the useful input voltage range becomes 20mV to 1.7V instead of the -100mV to 2.75V indicated by the Electrical Charac teristics. Beyond the useful input range, the buffer out- put is a nonlinear function of the input, but it will not undergo phase reversal or latchup. Enable The MAX4215 and MAX4219 have an enable feature (EN_) that allows the buffer to be placed in a low-power state. When the buffers are disabled, the supply current is reduced to 400µA per buffer. As the voltage at the EN_ pin approaches the negative supply rail, the EN_ input current rises. Figure 2 shows a graph of EN_ input current versus EN_ pin voltage. Figure 3 shows the addition of an optional resistor in series with the EN pin, to limit the magnitude of the cur- rent increase. Figure 4 displays the resulting EN pin input current to voltage relationship. Disabled Output Resistance The MAX4214/MAX4215/MAX4217/MAX4219/MAX4222 include internal protection circuitry that prevents dam- age to the precision input stage from large differential input voltages (Figure 5). This protection circuitry con- sists of five back-to-back Schottky diodes between IN_+ and IN_-. These diodes reduce the disabled out- put resistance from 1k Ω to 500Ω when the output volt- age is 3V greater or less than the voltage at IN_+. Under these conditions, the input protection diodes will be forward biased, lowering the disabled output resis- tance to 500 Ω. Output Capacitive Loading and Stability The MAX4214 family provides maximum AC perfor- mance with no load capacitance. This is the case when the load is a properly terminated transmission line. These devices are designed to drive up to 20pF of load capacitance without oscillating, but AC performance will be reduced under these conditions. High-Speed, Single-Supply, Gain of +2, Closed-Loop, Rail-to-Rail Buffers with Enable 10 ______________________________________________________________________________________ 20 -160 0 100 300 500 -100 -120 0 VIL (mV ABOVE VEE) 200 400 -60 -140 -20 -40 -80 Figure 2. Enable Logic-Low Input Current vs. Enable Logic- Low Threshold OUT IN- EN_ IN+ 10k ENABLE 500 Ω 500 Ω MAX42_ _ Figure 3. Circuit to Reduce Enable Logic-Low Input Current 0 -10 0 100 300 500 -7 -8 -1 VIL (mV ABOVE VEE) 200 400 -3 -5 -9 -2 -4 -6 Figure 4. Enable Logic-Low Input Current vs. Enable Logic- Low Threshold with 10k Ω Series Resistor |
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