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MAX4074__ESA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4074__ESA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 20 page Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps 10 ______________________________________________________________________________________ Pin Description _______________Detailed Description Maxim’s GainAmp fixed-gain amplifiers combine a low- cost rail-to-rail op amp with internal gain-setting resis- tors. Factory-trimmed on-chip resistors provide 0.1% gain accuracy while decreasing design size, cost, and layout. There are two versions in this amplifier family: single/dual/quad open-loop, unity-gain-stable devices (MAX4076/MAX4077/MAX4078), and single/dual fixed- gain devices (MAX4074/MAX4075). All amplifiers fea- ture rail-to-rail outputs and drive a 10k Ω load while maintaining excellent DC accuracy. Open-Loop Op Amps The single/dual/quad MAX4076/MAX4077/MAX4078 are low-power, open-loop op amps with rail-to-rail outputs. These devices are compensated for unity-gain stability and feature a GBW product of 230kHz. The common- mode range extends from 150mV below the negative rail to within 1.2V of the positive rail. These high-perfor- mance op amps serve as the core for this family of GainAmp fixed-gain amplifiers. Although the -3dB band- width will not correspond to that of a fixed-gain amplifier in higher gain configurations, these open-loop op amps can be used to prototype designs. Internal Gain-Setting Resistors Maxim’s proprietary laser trimming techniques allow RF/RG values (Figure 1) that produce many different gain configurations. These GainAmp fixed-gain ampli- fiers feature a negative-feedback resistor network that is laser trimmed to provide a gain-setting feedback ratio (RF/RG) with 0.1% typical accuracy. The standard op amp pinouts allow the GainAmp fixed-gain ampli- fiers to plug directly into existing board designs, easily replacing op amps-plus-resistor gain blocks. OUT AV = -RF RG RG RF IN- IN+ VCC VEE AV = 1 + RF RG Figure 1. Internal Gain-Setting Resistors FUNCTION Positive Supply VCC 5 No Connection. Not internally connected. N.C. — Inverting Amplifier Input IN_- 4 Noninverting Amplifier Input IN_+ 3 Negative Supply or Ground VEE 2 Amplifier Output OUT_ 1 7 1, 5, 8 2 3 4 6 8 — 2, 6 3, 5 4 1, 7 4 — 2, 6, 9, 13 3, 5, 10, 12 11 1, 7, 8, 14 MAX4075 MAX4077 MAX4078 µMAX/SO SO/TSSOP SOT23 NAME SO PIN MAX4074/MAX4076 |
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