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MAX4198ESA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4198ESA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page Rail-to-Rail Output Stage The MAX4198/MAX4199 output stage incorporates a common-source rail-to-rail structure which maximizes the dynamic range of the differential amplifier. The output can swing to within 100mV from each rail with a 5k Ω load to VCC / 2 (see Typical Operating Characteristics). Shutdown Mode The MAX4198/MAX4199 have an active-low shutdown input. SHDN input logic thresholds are referenced to VCC, not to GND. Pulling SHDN 2.5V below the positive rail places the amplifiers in a 12µA (max) shutdown mode. The MAX4198/MAX4199 exit or enter shutdown in 35µs. In shutdown, the OUT pin is high-impedance. Applications Information Driving Capacitive Loads The MAX4198/MAX4199 are relatively immune to oscilla- tions caused when driving large capacitive loads. Although heavy load capacitance increases transient ring- ing, sustained oscillations typically don’t occur for loads under 600pF (see Pulse Response with Capacitive Load in the Typical Operating Characteristics). Applications that require driving higher capacitive loads can isolate the out- put capacitance using a 15 Ω to 100Ω resistor between the amplifier output and the load (Figure 1). Although adding an isolation resistor dampens the response enough to pre- vent oscillations, it does so at the expense of bandwidth and DC accuracy. Power Supply Considerations The MAX4198/MAX4199 operate from single +2.7V to +7.5V supplies or from dual ±1.35V to ±3.75V supplies, and they consume only 45µA of supply current. Excellent power-supply rejection permits the amplifiers to be operated directly from a decaying 3V cell without excessive error. To maximize AC performance, the sup- ply must be bypassed with a 0.1µF ceramic capacitor to ground that must be as close as possible to the pin. If dual supplies are used, bypass both supply pins with 0.1µF to ground. Application Circuits Differential amplifiers can be used in single-ended and other amplifier applications. Figures 2 through 6 show the MAX4198/MAX4199 in different configurations. The internally trimmed and matched resistors offer conven- ience and have a distinct advantage over external resistors. These amplifiers are not compensated for sin- gle-ended unity gain; therefore, IN- should not be con- nected to OUT or left unconnected. Micropower, Single-Supply, Rail-to-Rail Precision Differential Amplifiers 10 ______________________________________________________________________________________ MAX4198 MAX4199 RISO FB OUT VEE VCC INPUT IN+ IN- REF CL RL OUTPUT Figure 1. Dual-Supply, Capacitive-Load Driving Circuit MAX4198 MAX4199 FB OUT VEE VCC IN+ IN- VA VB REF VOUT VOUT = (VB - VA) (MAX4198) VOUT = 10 (VB - VA) (MAX4199) Figure 2. Standard Difference Amplifier MAX4198 MAX4199 FB OUT VEE VCC IN+ IN- VA REF VOUT VOUT = -VA (MAX4198) VOUT = -10VA (MAX4199) Figure 3. Precision Inverting Buffer |
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