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AD8563 датащи(PDF) 8 Page - Analog Devices |
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AD8563 датащи(HTML) 8 Page - Analog Devices |
8 / 15 page AD8563 Preliminary Technical Data Rev. PrA | Page 8 of 15 MAXIMIZING PERFORMANCE THROUGH PROPER LAYOUT To achieve the maximum performance of the AD8563, care should be taken in the circuit board layout. The PC board surface must remain clean and free of moisture to avoid leakage currents between adjacent traces. Surface coating of the circuit board reduces surface moisture and provides a humidity barrier, reducing parasitic resistance on the board. Care must be taken to minimize parasitic capacitance on Pin 1 and Pin 10 (Resistor R1 connections). Traces from Pin 1 and Pin 10 to R1 should be kept short and symmetric. Excessive capacitance on these pins will result in a gain error. This effect is most prominent at low gains (G < 10). For high impedance sources, the PC board traces from the AD8563 inputs should be kept to a minimum to reduce input bias current errors. POWER SUPPLY BYPASSING The AD8563 uses internally generated clock signals to perform the auto-correction. As a result, proper bypassing is necessary to achieve optimum performance. Inadequate or improper bypassing of the supply lines can lead to excessive noise and offset voltage. A 0.1 μF surface-mount capacitor should be connected between the supply lines. This capacitor is necessary to minimize ripple from the correction clocks inside the IC. For dual-supply operation (see Figure 5), a 0.1 μF (ceramic) surface-mount capacitor should be connected from each supply pin to ground. For single-supply operation, a 0.1 μF surface-mount capacitor should be connected from the supply line to ground. All bypass capacitors should be positioned as close to the DUT supply pins as possible, especially the bypass capacitor between the supplies. Placement of the bypass capacitor on the back of the board directly under the DUT is preferred. INPUT OVERVOLTAGE PROTECTION All terminals of the AD8563 are protected against ESD. In the case of a dc overload voltage beyond either supply, a large current would flow directly through the ESD protection diodes. If such a condition should occur, an external resistor should be used in series with the inputs to limit current for voltages beyond the supply rails. The AD8563 can safely handle 5 mA of continuous current, resulting in an external resistor selection of REXT = (VIN − VS)/5 mA. CAPACITIVE LOAD DRIVE The output buffer, Pin 4, can drive capacitive loads up to 100 pF. I I I – IR1 M2 VINP M3 M4 M1 R1 (VINP – VINN) IR1 = R1 2I 2I VINN VBIAS M5 M6 I – IR1 I + IR1 2IR1 C2 R2 VREF A1 VINP – VINN R2 2R2 VOUT = VREF + EXTERNAL VCC Figure 2. Simplified AD8563 Schematic |
Аналогичный номер детали - AD8563 |
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Аналогичное описание - AD8563 |
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