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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AD8188ARUZ-R7 Datenblatt(PDF) 18 Page - Analog Devices |
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AD8188ARUZ-R7 Datenblatt(HTML) 18 Page - Analog Devices |
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18 / 24 page  AD8188/AD8189 Rev. 0 | Page 18 of 24 VEE DGND IN2B IN2A IN0A IN0B IN1A DVCC OE VCC SEL A/B AD8188 5V 5V VREF IN1B TO A/D, ETC. + – + – + – 10µF 0.1µF 0.1µF OUT0 OUT1 OUT2 RGB SOURCE A R G B RGB SOURCE B R G B 4.99kΩ 5V 0.1µF 4.99kΩ 75Ω 0.1µF 4.99kΩ 75Ω 0.1µF 4.99kΩ 75Ω 0.1µF 4.99kΩ 75Ω 0.1µF 4.99kΩ 75Ω 0.1µF 4.99kΩ 75Ω HI = ENABLE LO = DISABLE HI = A LO = B 4.99kΩ 5V 4.99kΩ 5V 4.99kΩ 5V 4.99kΩ 5V 4.99kΩ 5V Figure 54. AD8188 AC-Coupling Using Separate Voltage Dividers VEE DGND IN2B IN2A IN0A IN0B IN1A DVCC OE VCC SEL A/B AD8188 5V 5V VREF IN1B TO A/D, ETC. + – + – + – 10µF 0.1µF 0.1µF OUT0 OUT1 OUT2 RGB SOURCE A R G B RGB SOURCE B R G B 0.1µF 75Ω 0.1µF 75Ω 0.1µF 75Ω 0.1µF 75Ω 0.1µF 75Ω 0.1µF 75Ω HI = ENABLE LO = DISABLE HI = A LO = B 100Ω 100Ω 0.1µF 10µF 5V VMID 4.99kΩ VMID 4.99kΩ VMID 4.99kΩ VMID 4.99kΩ VMID 4.99kΩ VMID 4.99kΩ VMID Figure 55. AD8188 AC-Coupling Using a Single VMID Reference The circuit in Figure 55 can increase the crosstalk between inputs, because each input signal creates a small signal on VMID due to its nonzero impedance. There are several means to minimize this. First, make the impedance of the VMID divider small. Small resistor values lower the dc resistance, and good bypassing to ground minimizes the ac impedance. It is also possible to use a voltage regulator or another system supply voltage if it is the correct value. It should be close to the mid- supply voltage of the AD8188. The second technique for minimizing crosstalk is to use large resistor values to connect from the inputs to VMID. The major factor limiting the value of these resistors is offset caused by the input bias current (IB) that must flow through these resistors to the AD8188 inputs. The typical IB for an AD8188 input is 1.5 μA, which causes an offset voltage of 1.5 mV per 1 kΩ of resistance. |
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