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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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MCP1541-I Datenblatt(PDF) 9 Page - Microchip Technology |
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MCP1541-I Datenblatt(HTML) 9 Page - Microchip Technology |
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9 / 20 page  2001-2012 Microchip Technology Inc. DS21653C-page 9 MCP1525/41 4.0 APPLICATIONS INFORMATION 4.1 Application Tips 4.1.1 BASIC CIRCUIT CONFIGURATION The MCP1525 and MCP1541 voltage reference devices should be applied as shown in Figure 4-1 in all applications. FIGURE 4-1: Basic Circuit Configuration. As shown in Figure 4-1, the input voltage is connected to the device at the VIN input, with an optional 0.1 µF ceramic capacitor. This capacitor would be required if the input voltage has excess noise. A 0.1 µF capacitor would reject input voltage noise at approximately 1 to 2 MHz. Noise below this frequency will be amply rejected by the input voltage rejection of the voltage ref- erence. Noise at frequencies above 2 MHz will be beyond the bandwidth of the voltage reference and, consequently, not transmitted from the input pin through the device to the output. The load capacitance (C L) is required in order to stabilize the voltage reference; see Section 4.1.3 “Load Capacitor”. 4.1.2 INPUT (BYPASS) CAPACITOR The MCP1525 and MCP1541 voltage references do not require an input capacitor across VIN to VSS. However, for added stability and input voltage transient noise reduction, a 0.1 µF ceramic capacitor is recommended, as shown in Figure 4-1. This capacitor should be close to the device (within 5 mm of the pin). 4.1.3 LOAD CAPACITOR The output capacitor from VOUT to VSS acts as a frequency compensation for the references and cannot be omitted. Use load capacitors between 1 µF and 10 µF to compensate these devices. A 10 µF output capacitor has slightly better noise, and provides additional charge for fast load transients, when compared to a 1 µF output capacitor. This capacitor should be close to the device (within 5 mm of the pin). 4.1.4 PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS Mechanical stress due to Printed Circuit Board (PCB) mounting can cause the output voltage to shift from its initial value. Devices in the SOT-23-3 package are generally more prone to assembly stress than devices in the TO-92 package. To reduce stress-related output voltage shifts, mount the reference on low-stress areas of the PCB (i.e., away from PCB edges, screw holes and large components). 4.1.5 OUTPUT FILTERING If the noise at the output of these voltage references is too high for the particular application, it can be easily filtered with an external RC filter and op amp buffer. The op amp’s input and output voltage ranges need to include the reference output voltage. FIGURE 4-2: Output Noise-Reducing Filter. The RC filter values are selected for a desired cutoff frequency: EQUATION 4-1: The values that are shown in Figure 4-2 (10 k and 1 µF) will create a first-order, low-pass filter at the output of the amplifier. The cutoff frequency of this filter is 15.9 Hz, and the attenuation slope is 20 dB/decade. The MCP6021 amplifier isolates the loading of this low- pass filter from the remainder of the application circuit. This amplifier also provides additional drive, with a faster response time than the voltage reference. VSS VOUT VIN VREF VDD MCP1525 MCP1541 CL 1 µF to 10 µF CIN 0.1 µF (optional) VSS VOUT VIN CL RFIL MCP1525 MCP1541 10 µF 10 kW CFIL 1µF VDD VREF MCP6021 VDD f C 1 2 R FILCFIL ------------------------------ = 21653C.book Page 9 Thursday, January 10, 2013 12:55 PM |
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Ähnliche Beschreibung - MCP1541-I |
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