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LT1205 Datasheet(PDF) 8 Page - Linear Technology |
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LT1205 Datasheet(HTML) 8 Page - Linear Technology |
8 / 16 page 8 LT1203/LT1205 S APPLICATI I FOR ATIO CMOS MUX Channel-to-Channel Switching Transient OUTPUT 1V/DIV LT1203/05 • AI02 RS = 50Ω NOTE: 50 TIMES LARGER THAN LT1203 TRANSIENT LT1203/05 • AI03 OUTPUT (PIN 7) CHANNEL 1 = 0V CHANNEL 2 = 2MHz SINEWAVE LOGIC (PIN 5) LT1203 Switching Inputs only 10mVP-P. A photo of the switching transients from a CMOS MUX shows glitches to be 50 times larger than on the LT1203. Also shown is the output of the LT1203 switching on and off a 2MHz sinewave cleanly and without abnormalities. Pixel Switching The multiplexers are fabricated on LTC's Complementary Bipolar Process to attain fast switching speed, high band- width, and a wide supply voltage range compatible with traditional video systems. Channel-to-channel switching time and Enable time are both 25ns, therefore delay is the same when switching between channels or between ICs. To demonstrate the switching speed of the LT1203/LT1205 the RGB MUX of Figure 1 is used to switch RGB Worksta- tion inputs with a 22ns pixel width. Figure 2a is a photo showing the Workstation output and RGB MUX output. The slight rise time degradation at the RGB MUX output is due to the bandwidth of the LT1260 current feedback amplifier used to drive the 75 Ω cable. In Figure 2b, the LT1203 switches to an input at zero at the end of the first pixel and removes the following pixels. +1 1 2 3 4 5 6 7 8 16 15 14 13 1 2 3 4 8 7 6 5 12 1 16 15 14 13 12 11 10 9 2 3 4 5 6 7 8 LT1260 11 10 9 +1 +1 +1 LT1205 LT1203/05 • F01 +1 +1 LT1203 R4 75 Ω J4 GREEN 2 J7 LOGIC R6 75 Ω C1 0.1 µF C2 0.1 µF C3 4.7 µF C4 4.7 µF J6 BLUE 2 R8* 10k R13 1.5k R15 1.5k R9* 10k *OPTIONAL R14 1.5k R7* 10k R5 75 Ω J5 BLUE 1 R3 75 Ω J3 GREEN 1 R2 75 Ω J2 RED 2 R1 75 Ω J1 RED 1 – + R12 1.5k R10 1.5k V+ V – R11 1.5k R G B + GND J8 ENABLE J9 RED J10 GREEN J11 BLUE R16 75 Ω R17 75 Ω R18 75 Ω Figure 1. RGB MUX INPUT 1V/DIV LOGIC CONTROL |
Similar Part No. - LT1205_15 |
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Similar Description - LT1205_15 |
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