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AD8509ARU 데이터시트(PDF) 7 Page - Analog Devices |
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AD8509ARU 데이터시트(HTML) 7 Page - Analog Devices |
7 / 8 page AD8509/AD8511 Rev. B | Page 7 of 8 APPLICATIONS The AD8509 and AD8511 are CMOS buffers with A/B inputs, which are used to select between two different reference voltages set up by an external resistor ladder. Input bias currents are orders of magnitude less than competitive parts. This allows very large resistor ladders to be used to save supply current. A guaranteed value of 50 nA is much higher than actual values and is limited by leakage in the test system. Buffer outputs are designed to drive resistive loads. They are also stable with capacitive loads, so no resistors should be used in series with these outputs to attain the best display perform- ance. Outputs have high slew rates and 6 µs settling times. Each output can deliver a minimum of 120 mA, assuring fast response to varying loads. The AD8509 is a 9-channel buffer and is similar to the LMC6009 in functionality. The AD8511 is an 11-channel buffer similar to the CL-FP6131. However, the control to select either 9- or 11-channel operation, the EN_11 pin of the CL-FP6131, is not available on the AD8511. If 9-channel operation is desired, use the AD8509. Power supply pins on the AD8509 and AD8511 have multiple ground and VCC connections. Because of the high peak currents that these buffers can deliver, it is strongly recommended that all of the ground and VCC pins be connected, and that the VCC pins be suitably bypassed. |
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