Datasheet LT1259, LT1260 (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | Low Cost Dual and Triple 130MHz Current Feedback Amplifiers with Shutdown |
| Pages / Page | 12 / 9 — APPLICATIO S I FOR ATIO. Amplifier Disable Time, AV = 10. Amplifier … |
| File Format / Size | PDF / 337 Kb |
| Document Language | English |
APPLICATIO S I FOR ATIO. Amplifier Disable Time, AV = 10. Amplifier Enable/Disable Time, AV = 2
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LT1259/LT1260
U U W U APPLICATIO S I FOR ATIO Amplifier Disable Time, AV = 10 Amplifier Enable/Disable Time, AV = 2
EN EN OUTPUT OUTPUT V LT1259/LT1260 • AI05 LT1259/LT1260 • AI06 S = ±5V RF = 1k RL = 150Ω VS = ±5V RF = RG = 1.6k VIN = 0.1V RG = 110Ω VIN = 2VPP at 2MHz RL = 100Ω
Differential Input Signal Swing
input pins is small, so this clamp has no effect. In the disabled mode however, the differential swing can be the The differential input swing is limited to about ±6V by an same as the input swing, and the clamp voltage will set the ESD protection device connected between the inputs. In maximum allowable input voltage. normal operation, the differential voltage between the
U TYPICAL APPLICATIO S 2-Input Video MUX Cable Driver
configuring each amplifier as a unity-gain follower. The switching time between channels is 100ns when both The application on the first page shows a low cost, 2- EN A and EN B are driven. input video MUX cable driver. The scope photo displays the cable output of a 30MHz square wave driving 150Ω.
2-Input RGB MUX Cable Driver Demonstration Board
In this circuit the active amplifier is loaded by RF and RG of the disabled amplifier, but in this case it only causes a A complete 2-input RGB MUX has been fabricated on PC 1.2% gain error. The gain error can be eliminated by Demo Board #039A. The board incorporates two LT1260s with outputs summed through 75Ω back termination
2-Input Video MUX Switching Response
resistors as shown in the schematic. There are several things to note about Demo Board #039A: EN A 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. EN B 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. V LT1259/LT1260 • TA03 S = ± 5V RF = RG = 1.6k VIN A = VIN 2 = 2VPP at 2MHz RL = 100Ω 9
U U W U APPLICATIO S I FOR ATIO Amplifier Disable Time, AV = 10 Amplifier Enable/Disable Time, AV = 2
EN EN OUTPUT OUTPUT V LT1259/LT1260 • AI05 LT1259/LT1260 • AI06 S = ±5V RF = 1k RL = 150Ω VS = ±5V RF = RG = 1.6k VIN = 0.1V RG = 110Ω VIN = 2VPP at 2MHz RL = 100Ω
Differential Input Signal Swing
input pins is small, so this clamp has no effect. In the disabled mode however, the differential swing can be the The differential input swing is limited to about ±6V by an same as the input swing, and the clamp voltage will set the ESD protection device connected between the inputs. In maximum allowable input voltage. normal operation, the differential voltage between the
U TYPICAL APPLICATIO S 2-Input Video MUX Cable Driver
configuring each amplifier as a unity-gain follower. The switching time between channels is 100ns when both The application on the first page shows a low cost, 2- EN A and EN B are driven. input video MUX cable driver. The scope photo displays the cable output of a 30MHz square wave driving 150Ω.
2-Input RGB MUX Cable Driver Demonstration Board
In this circuit the active amplifier is loaded by RF and RG of the disabled amplifier, but in this case it only causes a A complete 2-input RGB MUX has been fabricated on PC 1.2% gain error. The gain error can be eliminated by Demo Board #039A. The board incorporates two LT1260s with outputs summed through 75Ω back termination
2-Input Video MUX Switching Response
resistors as shown in the schematic. There are several things to note about Demo Board #039A: EN A 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. EN B 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. V LT1259/LT1260 • TA03 S = ± 5V RF = RG = 1.6k VIN A = VIN 2 = 2VPP at 2MHz RL = 100Ω 9
