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LT1395CS5-TR Datasheet(PDF) 11 Page - Linear Technology |
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LT1395CS5-TR Datasheet(HTML) 11 Page - Linear Technology |
11 / 20 page 11 LT1395/LT1396/LT1397 139567fc it is important to keep the EN pin at least 3V below the V + supply. If a V + of less than 3V is desired, and the amplifier will remain enabled at all times, then the EN pin should be tied to the V – supply. The enable pin current is approxi- mately 30 µA when activated. If using CMOS open-drain logic, an external 1k pull-up resistor is recommended to ensure that the LT1395CS6 remains disabled in spite of any CMOS drain leakage currents. The enable/disable times are very fast when driven from standard 5V CMOS logic. The LT1395CS6 enables in about 30ns (50% point to 50% point) while operating on ±5V supplies (Figure 2). Likewise, the disable time is approximately 40ns (50% point to 50% point) (Figure 3). Figure 2. Amplifier Enable Time, AV = 2 VS = ±5V VIN = 1V RF = 255Ω RG = 255Ω RL = 100Ω 1395/6/7 F02 OUTPUT EN Figure 3. Amplifier Disable Time, AV = 2 VS = ±5V VIN = 1V RF = 255Ω RG = 255Ω RL = 100Ω 1395/6/7 F03 OUTPUT EN S APPLICATI I FOR ATIO Differential Input Signal Swing To avoid any breakdown condition on the input transis- tors, the differential input swing must be limited to ±5V. In normal operation, the differential voltage between the input pins is small, so the ±5V limit is not an issue. Buffered RGB to Color-Difference Matrix An LT1397 can be used to create buffered color-differ- ence signals from RGB inputs (Figure 4). In this applica- tion, the R input arrives via 75 Ω coax. It is routed to the noninverting input of LT1397 amplifier A1 and to a 845 Ω resistor R8. There is also an 82.5 Ω termination resistor R11, which yields a 75 Ω input impedance at the R input when considered in parallel with R8. R8 connects to the inverting input of a second LT1397 amplifier (A2), which also sums the weighted G and B inputs to create a –0.5 • Y output. LT1397 amplifier A3 then takes the –0.5 • Y output and amplifies it by a gain of –2, resulting in the Y output. Amplifier A1 is configured in a noninvert- ing gain of 2 with the bottom of the gain resistor R2 tied to the Y output. The output of amplifier A1 thus results in the color-difference output R-Y. The B input is similar to the R input. It arrives via 75 Ω coax, and is routed to the noninverting input of LT1397 amplifier A4, and to a 2320 Ω resistor R10. There is also a 76.8 Ω termination resistor R13, which yields a 75Ω Figure 4. Buffered RGB to Color-Difference Matrix A2 1/4 LT1397 A3 1/4 LT1397 – + A1 1/4 LT1397 R7 255 Ω R6 127 Ω R5 255 Ω R10 2320 Ω R9 432 Ω R11 82.5 Ω R G B R12 90.9 Ω R13 76.8 Ω ALL RESISTORS 1% VS = ±5V R8 845 Ω 75 Ω SOURCES R1 255 Ω R2 255 Ω R4 255 Ω R3 255 Ω B-Y Y R-Y 1395/6/7 F04 A4 1/4 LT1397 |
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