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MAX4074__EUK- Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4074__EUK- Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 20 page Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps ______________________________________________________________________________________ 11 GainAmp Bandwidth GainAmp fixed-gain amplifiers feature factory-trimmed precision resistors to provide fixed inverting gains from -0.25V/V to -100V/V or noninverting gains from +1.25V/V to +101V/V. The op amp core is decompensated strate- gically over the gain-set options to maximize band- width. Open-loop decompensation increases GBW product, ensuring that usable bandwidth is maintained with increasing closed-loop gains. A GainAmp with a fixed gain of AV = +25V/V has a -3dB bandwidth of 120kHz. By comparison, a unity-gain-stable op amp con- figured for AV = +25V/V would yield a -3dB bandwidth of only 8kHz. Decompensation is performed at five inter- mediate gain sets, as shown in the Gain Selector Guide. High-Voltage (±17V) Input Fault Protection The MAX4074/MAX4075 family includes ±17V input fault protection. For normal operation, see the input voltage range specification in the Electrical Character- istics. Overdriven inputs up to ±17V will not cause out- put phase reversal. A back-to-back SCR structure at the input pins allows either input to safely swing ±17V relative to VEE (Figure 2). Additionally, the internal op amp inputs are diode clamped to both supply rails for the protection of sensitive input stage circuitry. Current through the clamp diodes is limited by a 5k Ω resistor at the noninverting input, and by RG at the inverting input. An IN+ or IN- fault voltage as high as ±17V causes less than 3.5mA to flow through the input pin, protecting both the GainAmp and the signal source from damage. Applications Information GainAmp fixed-gain amplifiers offer a precision, fixed- gain amplifier in a small package that can be used in a variety of circuit board designs. GainAmp fixed-gain amplifiers can be used in many op amp circuits that use resistive negative feedback to set gain, and do not require other connections to the op amp inverting input. Both inverting and noninverting op amp configurations can be implemented easily using a GainAmp. GainAmp Input Voltage Range The MAX4074/MAX4075 combine both an op amp and gain-setting feedback resistors on the same IC. The inverting input voltage range is different from the nonin- verting input voltage range because the inverting input pin is connected to the RG input series resistor. Just as with a discrete design, take care not to saturate the inputs/output of the core op amp to avoid signal distor- tions or clipping. OUT IN- IN+ RG RF 5k NOTE: INPUT STAGE PROTECTION INCLUDES TWO 17V SCRs AND TWO DIODES AT THE INPUT STAGE. VEE MAX4074 MAX4075 17V SCR VEE VEE VCC 17V SCR Figure 2. Input Protection |
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