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MAX4492 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX4492 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page Low-Cost, High-Slew-Rate, Rail-to-Rail I/O Op Amps in SC70 _______________________________________________________________________________________ 5 NAME FUNCTION MAX4490 1 IN+ Noninverting Input PIN 2 VSS Negative Supply Input. Connect to ground for single-supply operation. 3 IN- Inverting Input – INA- Inverting Input to Amplifier A – INA+ Noninverting Input to Amplifier A 5 VDD Positive Supply Input 4 OUT Amplifier Output – INC+, IND+ Noninverting Inputs to Amplifiers C and D – OUTB Amplifier B Output – INB- Inverting Input to Amplifier B – INB+ Noninverting Input to Amplifier B – OUTA Amplifier A Output Pin Description MAX4492 – 11 – 2 3 4 – 10, 12 7 6 5 1 MAX4491 – 4 – 2 3 8 – – 7 6 5 1 – – 9, 13 INC-, IND- Inverting Inputs to Amplifiers C and D – – 8, 14 OUTC, OUTD Amplifiers C and D Outputs Detailed Description Rail-to-Rail Input Stage The MAX4490/MAX4491/MAX4492 CMOS operational amplifiers have parallel-connected N- and P-channel differential input stages that combine to accept a com- mon-mode range extending to both supply rails. The N- channel stage is active for common-mode input voltages typically greater than (VSS + 1.2V), and the P- channel stage is active for common-mode input volt- ages typically less than (VDD - 1.2V). Rail-to-Rail Output Stage The MAX4490/MAX4491/MAX4492 CMOS operational amplifiers feature class-AB push-pull output stages that can drive a 100k Ω load to within 1.5mV of either supply rail. Short-circuit output current is typically ±50mA. Figures 1a and 1b show the typical temperature depen- dence of output source and sink currents, respectively, for three fixed values of (VDD - VOH) and (VOL - VSS). For example, at VDD = +5.0V, the load currents that maintain (VDD - VOH) = 100mV and (VOL - VSS) = 100mV at TA = +25°C are 2.2mA and 3.3mA, respectively, when the load is connected to VDD/2. Consistent resis- tive drive capability is (2.5 - 0.1) / 2.2 = 1.1k Ω. For the same application, resistive drive capability is 2.2k Ω when the load is connected to VDD or VSS. Applications Information Power-Supply Considerations The MAX4490/MAX4491/MAX4492 operate from a sin- gle +2.7V to +5.5V supply or from dual ±1.35V to ±2.75V supplies with typically 800µA supply current per amplifier. A high power-supply rejection ratio of 100dB allows for extended operation from a decaying battery voltage, thereby simplifying designs for portable applications. For single-supply operation, bypass the power supply with a 0.1µF ceramic capaci- tor placed close to the VDD pin. For dual-supply opera- tion, bypass each supply to ground. Input Capacitance One consequence of the parallel-connected differential input stages for rail-to-rail operation is a relatively large input capacitance CIN (typically 5pF). This introduces a |
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