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MCP6001EP bảng dữ liệu(PDF) 8 Page - Microchip Technology |
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MCP6001EP bảng dữ liệu(HTML) 8 Page - Microchip Technology |
8 / 24 page MCP6001/2/4 DS21733D-page 8 2003 Microchip Technology Inc. 3.4 Supply Bypass With this family of operation amplifiers, the power sup- ply pin (VDD for single supply) should have a local bypass capacitor (i.e., 0.01 µF to 0.1 µF) within 2 mm for good high frequency performance. It also needs a bulk capacitor (i.e., 1 µF or larger) within 100 mm to provide large, slow currents. This bulk capacitor can be shared with other parts. 3.5 PCB Surface Leakage In applications where low input bias current is critical, PCB (printed circuit board) surface leakage effects need to be considered. Surface leakage is caused by humidity, dust or other contamination on the board. Under low humidity conditions, a typical resistance between nearby traces is 1012 Ω. A 5V difference would cause 5 pA, if current-to-flow; this is greater than the MCP6001/2/4 family’s bias current at 25°C (1 pA, typ). The easiest way to reduce surface leakage is to use a guard ring around sensitive pins (or traces). The guard ring is biased at the same voltage as the sensitive pin. An example of this type of layout is shown in Figure 3-4. FIGURE 3-4: Example Guard Ring Layout for Inverting Gain. 1. Non-inverting Gain and Unity Gain Buffer: a. Connect the non-inverting pin (VIN+) to the input with a wire that does not touch the pcb surface. b. Connect the guard ring to the inverting input pin (VIN–). This biases the guard ring to the common mode input voltage. 2. Inverting and Transimpedance Gain Amplifiers (convert current to voltage, such as photo detec- tors): a. Connect the guard ring to the non-inverting input pin (VIN+). This biases the guard ring to the same reference voltage as the op amp (e.g., VDD/2 or ground). b. Connect the inverting pin (VIN–) to the input with a wire that does not touch the PCB surface. 3.6 Application Circuits 3.6.1 UNITY GAIN BUFFER The rail-to-rail input and output capability of the MCP6001/2/4 op amp is ideal for unity-gain buffer applications. The low quiescent current and wide band- width makes the device suitable for a buffer configura- tion in an instrumentation amplifier circuit, as shown in Figure 3-5. FIGURE 3-5: Instrumentation Amplifier with Unity Gain Buffer Inputs. 3.6.2 ACTIVE LOW-PASS FILTER The MCP6001/2/4 op amp’s low input bias current makes it possible for the designer to use larger resis- tors and smaller capacitors for active low-pass filter applications. However, as the resistance increases, the noise generated also increases. Parasitic capacitances and the large value resistors could also modify the fre- quency response. These trade-offs need to be considered when selecting circuit elements. It is possible to have a filter cutoff frequency as high as 1/10th of the op amp bandwidth (100 kHz). Figure 3-6 shows a second-order butterworth filter with 100 kHz cutoff frequency and a gain of +1V/V. The component values were selected using Microchip’s FilterLab® software. FIGURE 3-6: Active Second-Order Low- Pass Filter. Guard Ring V SS VIN-VIN+ VIN1 R2 MCP6002 VIN2 R2 MCP6002 VREF MCP6001 VOUT R1 R1 - + - + - + 1/2 1/2 VOUT VIN2 VIN1 – () R1 R2 ------ • VREF + = R1 = 20 kΩ R2 = 10 kΩ 14.3 k Ω MCP6002 VOUT 53.6 k Ω 100 pF VIN 33 pF + - |
Số phần tương tự - MCP6001EP |
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Mô tả tương tự - MCP6001EP |
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