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OPA244NA3KG4 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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OPA244NA3KG4 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 26 page  11 OPA244, 2244, 4244 ® APPLICATIONS INFORMATION The OPA244 is unity-gain stable and suitable for a wide range of general purpose applications. Power supply pins should be bypassed with 0.01 µF ceramic capacitors. OPERATING VOLTAGE The OPA244 can operate from single supply (+2.2V to +36V) or dual supplies ( ±1.1 to ±18V) with excellent performance. Unlike most op amps which are specified at only one supply voltage, the OPA244 is specified for real world applications; a single set of specifications applies throughout the +2.6V to +36V ( ±1.3 to ±18V) supply range. This allows a designer to have the same assured perfor- mance at any supply voltage within this range. In addition, many key parameters are guaranteed over the specified temperature range, –40 °C to +85°C. Most behavior remains unchanged throughout the full operating voltage range. Pa- rameters which vary significantly with operating voltage or temperature are shown in typical performance curves. Useful information on solder pad design for printed circuit boards can be found in Burr-Brown's Application Bulletin AB-132B, “Solder Pad Recommendations for Surface- Mount Devices,” easily found at Burr-Brown's web site (http://www.burr-brown.com). FIGURE 1. Low and High-Side Battery Current Sensing. R L 10 Ω A1 OPA244 + R 1 38.3k Ω R 3 38.3k Ω R 5 383k Ω R 6 10k Ω R 7 9.09k Ω R 4 20k Ω R 2 19.1k Ω A2 OPA244 R 8 100k Ω R H 10 Ω I H V+ V– V+ V– 2.2V to 36V ( ±1.1V to ±18V) V+ for A1, A2 –In +In –In +In V O = 10 • IH • RH To Load To Load V O = 10 • IL • RL Common-mode range of A2 extends to V– for low-side sensing. Optional for I B Cancellation (R 7 = R6 II R8) R 2 and R4 divide down the common-mode input to A1. Low-Side Current Sense High-Side Current Sense Out Out NOTE: Low and high-side sensing circuits can be used independently. V– for A1, A2 I L |
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