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LT1205 Datasheet(PDF) 9 Page - Linear Technology |
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LT1205 Datasheet(HTML) 9 Page - Linear Technology |
9 / 16 page 9 LT1203/LT1205 WORKSTATION OUTPUT LT1203/05 • F02a Figure 2a. Workstation and RGB MUX Output LT1203/05 • F02b Figure 2b. RGB MUX Output Switched to Ground After One Pixel S APPLICATI I FOR ATIO FREQUENCY (MHz) 1 –2 –1 0 1 2 10 100 1000 LT1203/05 • F04 –3 –4 3 4 G R, B VS = ±15V RL = 150Ω RF = RG = 1.3k Input Expansion The output impedance of the LT1203/LT1205 is typically 20 Ω when enabled and 10MΩ when disabled or not selected. This high disabled output impedance allows the output of many LT1205s to be shorted together to form large crosspoint arrays. With their outputs shorted to- gether, shoot-through current is low because the “on” channel is disabled before the “off” channel is activated. ENABLE IC #1 Timing and Supply Current Waveforms ENABLE IC #2 VOUT 1V/DIV IS 10mA/DIV 5V/DIV 5V/DIV LT1203/05 • AI04 Four LT1205s are used in Figure 5 to form a 16-to-1 multiplexer which is very space efficient and uses only six SO packages. In this application 15 switches are turned off and only one is active. An attenuator is formed by the 15 deselected switches and the active device which has an Figure 4. RGB MUX Frequency Response of Demonstration Board #041 RGB MUX OUTPUT WORKSTATION OUTPUT RGB MUX OUTPUT Demonstration Board A Demonstration Board (#041) of the RGB MUX in Figure 1 has been fabricated and its layout is shown in Figure 3. The small-signal bandwidth of the RGB MUX is set by the bandwidth of the LT1260. The stray capacitance of the surface mount feedback resistors RF and RG restricts the – 3dB bandwidth to about 95MHz. The bandwidth can be improved by about 20% using the through-hole LT1260 and components. A frequency response plot in Figure 4 shows that the R, G, and B amplifiers have slightly different frequency responses. The difference in the G amplifier is due to different output trace routing to feedback resistor R13. |
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