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LMH6647MF Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMH6647MF Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 19 page LMH6645/46/47 2.7V, 650µA, 55MHz, Rail-to-Rail Input and Output Amplifiers with Shutdown Option General Description The LMH6645 (single) and LMH6646 (dual), rail-to-rail input and output voltage feedback amplifiers, offer high speed (55MHz), and low voltage operation (2.7V) in addition to micro-power shutdown capability (LMH6647, single). Input common mode voltage range exceeds either supply by 0.3V, enhancing ease of use in multitude of applications where previously only inferior devices could be used. Output voltage range extends to within 20mV of either supply rails, allowing wide dynamic range especially in low voltage appli- cations. Even with low supply current of 650µA/amplifier, output current capability is kept at a respectable ±20mA for driving heavier loads. Important device parameters such as BW, Slew Rate and output current are kept relatively inde- pendent of the operating supply voltage by a combination of process enhancements and design architecture. In portable applications, the LMH6647 provides shutdown capability while keeping the turn-off current to less than 50µA. Both turn-on and turn-off characteristics are well be- haved with minimal output fluctuations during transitions. This allows the part to be used in power saving mode, as well as multiplexing applications. Miniature packages (SOT23, MSOP-8, and SO-8) are further means to ease the adoption of these low power high speed devices in applica- tions where board area is at a premium. Features (V S = 2.7V, TA = 25˚C, RL =1kΩ to V +/2, A V = +1. Typical values unless specified). n −3dB BW 55MHz n Supply voltage range 2.5V to 12V n Slew rate 22V/µs n Supply current 650µA/channel n Output short circuit current 42mA n Linear output current ±20mA n Input common mode voltage 0.3V beyond rails n Output voltage swing 20mV from rails n Input voltage noise 17nV/ n Input current noise 0.75pA/ Applications n Active filters n High speed portable devices n Multiplexing applications (LMH6647) n Current sense buffer n High speed transducer amp Connection Diagrams SOT23-5 (LMH6645) SOT23-6 (LMH6647) SOIC-8 (LMH6645) 20020259 Top View 20020260 Top View 20020261 Top View February 2002 © 2002 National Semiconductor Corporation DS200202 www.national.com |
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