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MCP48FVB21 数据表(PDF) 44 Page - Microchip Technology |
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MCP48FVB21 数据表(HTML) 44 Page - Microchip Technology |
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44 / 84 page  MCP48FVBXX DS20005466A-page 44 2015 Microchip Technology Inc. 5.4 Internal Band Gap The internal band gap is designed to drive the Resistor Ladder Buffer. The resistance of a resistor ladder (RRL) is targeted to be 140 k (40 k), which means a minimum resistance of 100 k . The band gap selection can be used across the VDD voltages while maximizing the VOUT voltage ranges. For VDD voltages below the 2 Gain VBG voltage, the output for the upper codes will be clipped to the VDD voltage. Table 5-4 shows the maximum DAC register code given device VDD and Gain bit setting. TABLE 5-4: VOUT USING BAND GAP Max DAC Code (1) 12-bit 10-bit 8-bit Comment 5.5 1 FFFh 3FFh FFh VOUT(max) = 2.44V (2) 2 FFFh 3FFh FFh VOUT(max) = 4.88V (2) 2.7 1 FFFh 3FFh FFh VOUT(max) = 2.44V ( 2) 2 8DAh 236h 8Dh ~ 0 to 55% range 2.0 (3) 1 D1Dh 347h D1h ~ 0 to 82% range 2 ( 4) 68Eh 1A3h 68h ~ 0 to 41% range Note 1: Without the VOUT pin voltage being clipped. 2: When VBG = 1.22V typical. 3: Band gap performance achieves full performance starting from a VDD of 2.0V. 4: It is recommended to use Gain = 1 setting instead. |
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