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AD526CD Arkusz danych(PDF) 10 Page - Analog Devices |
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AD526CD Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 14 page AD526 REV. D –10– GROUNDING AND BYPASSING Proper signal and grounding techniques must be applied in board layout so that specified performance levels of precision data acquisition components, such as the AD526, are not degraded. As is shown in Figure 37, logic and signal grounds should be separate. By connecting the signal source ground locally to the AD526 analog ground Pins 5 and 6, gain accuracy of the AD526 is maintained. This ground connection should not be corrupted by currents associated with other elements within the system. GAIN NETWORK LATCHES AND LOGIC DIGITAL GROUND AMP VOUT FORCE VOUT SENSE ANALOG GROUND 1 ANALOG GROUND 2 +VS –VS AD526 VIN +15V –15V 0.1 F 0.1 F 0.1 F 0.1 F 1 F +5V AD574 12-BIT A/D CONVERTER Figure 37. Grounding and Bypassing OUT FORCE OUT SENSE 0.1 F –VS 0.1 F +VS +5V A2 A1 A0 VIN CLK 16 15 14 13 12 11 10 9 12 34 56 78 + – AD526 16 84 21 GAIN NETWORK A1 A0 CS CLK A2 B LOGIC AND LATCHES OUT FORCE OUT SENSE VOUT 0.1 F –VS 0.1 F +VS +5V 16 15 14 13 12 11 10 9 12 34 56 78 + – AD526 16 84 21 GAIN NETWORK A1 A0 CS CLK A2 B LOGIC AND LATCHES Figure 38. Cascaded Operation Utilizing the force and sense outputs of the AD526, as shown in Figure 38, avoids signal drops along etch runs to low impedance loads. Table II. Logic Table for Figure 38 VOUT/VIN A2 A1 A0 10 0 0 20 0 1 40 1 0 80 1 1 16 1 0 0 32 1 0 1 64 1 1 0 128 1 1 1 |
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