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COP8-REF-AM 数据表(PDF) 56 Page - National Semiconductor (TI) |
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COP8-REF-AM 数据表(HTML) 56 Page - National Semiconductor (TI) |
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56 / 83 page  17.0 Stand-Alone Amplifier A stand-alone Amplifier, AMP1, is provided on Port B. It supports rail-to-rail inputs and outputs, and operates over the entire V CC and temperature range. This amplifier is in addition to the programmable gain amplifier in the A/D Con- verter. It is an alternate function on Port B. It is enabled/disabled by the ENAMP1 bit in the ADGAIN register described in the A/D Converter section. The normal port B3–B5 pins should be configured in their high Z state when using AMP1. It is disabled after Reset. The circuit will only draw current when it’s enabled. When disabled, the current drawn is extremely low. When using the HALT mode of the device, AMP1 will draw current unless it is disabled by software. Therefore, for mini- mal current in HALT mode, AMP1 should be disabled prior to entering HALT. The electrical parameters of AMP1 are shown in the Electri- cal Characteristics section. 17.1 BLOCK DIAGRAM 20006359 FIGURE 30. Amplifier1 Block Diagram www.national.com 56 |
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