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LT1260CS Datasheet(PDF) 9 Page - Linear Technology |
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LT1260CS Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LT1259/LT1260 VS = ±5V VIN = 0.1V Amplifier Disable Time, AV = 10 RF = 1k RG = 110Ω LT1259/LT1260 • AI05 EN OUTPUT RL = 150Ω Amplifier Enable/Disable Time, AV = 2 VS = ±5V VIN = 2VPP at 2MHz LT1259/LT1260 • AI06 OUTPUT RF = RG = 1.6k RL = 100Ω Differential Input Signal Swing The differential input swing is limited to about ±6V by an ESD protection device connected between the inputs. In normal operation, the differential voltage between the input pins is small, so this clamp has no effect. In the disabled mode however, the differential swing can be the same as the input swing, and the clamp voltage will set the maximum allowable input voltage. VS = ±5V VIN A = VIN 2 = 2VPP at 2MHz 2-Input Video MUX Switching Response LT1259/LT1260 • TA03 EN A EN B RF = RG = 1.6k RL = 100Ω 2-Input Video MUX Cable Driver The application on the first page shows a low cost, 2- input video MUX cable driver. The scope photo displays the cable output of a 30MHz square wave driving 150 Ω. In this circuit the active amplifier is loaded by RF and RG of the disabled amplifier, but in this case it only causes a 1.2% gain error. The gain error can be eliminated by configuring each amplifier as a unity-gain follower. The switching time between channels is 100ns when both EN A and EN B are driven. 2-Input RGB MUX Cable Driver Demonstration Board A complete 2-input RGB MUX has been fabricated on PC Demo Board #039A. The board incorporates two LT1260s with outputs summed through 75 Ω back termination resistors as shown in the schematic. There are several things to note about Demo Board #039A: 1. The feedback resistors of the disabled LT1260 load the enabled amplifier and cause a small (1% to 2%) gain error depending on the values of RF and RG. Configure the amplifiers as unity-gain followers to eliminate this error. 2. The feedback node has minimum trace length connect- ing RF and RG to minimize stray capacitance. 3. Ground plane is pulled away from RF and RG on both sides of the board to minimize stray capacitance. EN APPLICATIO S I FOR ATIO TYPICAL APPLICATIO S |
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