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MCP48FVB08 数据表(PDF) 89 Page - Microchip Technology |
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MCP48FVB08 数据表(HTML) 89 Page - Microchip Technology |
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89 / 112 page  2020 Microchip Technology Inc. DS20006362A-page 89 MCP48FXBX4/8 8.0 APPLICATIONS INFORMATION The MCP48FXBX4/8 devices are general purpose, quad/octal-channel voltage output DACs for various applications, where a precision operation with low-power and nonvolatile EEPROM memory is needed. Since the devices include a nonvolatile EEPROM memory, the user can utilize these devices for applications that require the output to return to the previous setup value on subsequent power-ups. 8.1 Power Supply Considerations The power source should be as clean as possible. The power supply to the device is also used for the DAC voltage reference internally if the internal VDD is selected as the resistor ladder’s reference voltage (VRnB:VRnA = 00). Any noise induced on the VDD line can affect the DAC performance. Typical applications will require a bypass capacitor in order to filter out high-frequency noise on the VDD line. The noise can be induced onto the power supply’s traces or as a result of changes on the DAC out- put. The bypass capacitor helps to minimize the effect of these noise sources on signal integrity. Figure 8-1 shows an example of using two bypass capacitors (a 10 µF tantalum capacitor and a 0.1 µF ceramic capaci- tor) in parallel on the VDD line. These capacitors should be placed as close to the VDD pin as possible (within 4 mm). If the application circuit has separate digital and analog power supplies, the VDD and VSS pins of the device should reside on the analog plane. When setting the part voltage reference to Band Gap mode, the use of the VREF pin decoupling capacitors is not recommended. FIGURE 8-1: Example Circuit. Analog VDD VDD SDI SDO VSS VOUT0 To MCU C1: 0.1 µF capacitor = Ceramic C2: 10 µF capacitor = Tantalum C3: ~0.1 µF = Optional to reduce noise in VOUT pin C4: 0.1 µF capacitor = Ceramic C5: 10 µF capacitor = Tantalum C6: 0.1 µF capacitor = Ceramic C2 C1 Optional (a) Circuit when VDD is selected as reference. Note: VDD is connected to the reference circuit internally. (b) Circuit when external reference is used. Output VREF LAT/HVC VOUTN CN C3 Analog VDD VDD C2 C1 VREF VREF Analog VOUT0 Optional Output VOUTN CN C3 SCK CS SDI SDO VSS To MCU LAT/HVC SCK CS |
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