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HA5024IB Datasheet(PDF) 9 Page - Renesas Technology Corp |
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HA5024IB Datasheet(HTML) 9 Page - Renesas Technology Corp |
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9 / 17 page  HA5024 FN3550 Rev 6.00 Page 9 of 17 February 8, 2006 needed, and the HA5024 can drive low impedance (large capacitance) loads if a series isolation resistor is used. Referring to Figure 10, both inputs are terminated in their characteristic impedance; 75 is typical for video applications. Since the drivers usually are terminated in their characteristic impedance the input gain is 0.5, thus the amplifiers, U2, are configured in a gain of +2 to set the circuit gain equal to one. Resistors R2 and R3 determine the amplifier gain, and if a different gain is desired R2 should be changed according to the equation G = (1 + R3/R2). R3 sets the frequency response of the amplifier so you should refer to the manufacturers data sheet before changing its value. R5, C1 and D1 are an asymmetrical charge/discharge time circuit which configures U1 as a break before make switch to prevent both amplifiers from being active simultaneously. If this design is extended to more channels the drive logic must be designed to be break before make. R4 is enclosed in the feedback loop of the amplifier so that the large open loop amplifier gain of U2 will present the load with a small closed loop output impedance while keeping the amplifier stable for all values of load capacitance. The circuit shown in Figure 10 was tested for the full range of capacitor values with no oscillations being observed; thus, problem one has been solved.The frequency and gain characteristics of the circuit are now those of the amplifier independent of any multiplexing action; thus, problem two has been solved. The multiplexer transition time is approximately 15 s with the component values shown. NOTES: 18. U1 is HA5024IP. 19. All resistors in 20. S1 is break before make. 21. Use ground plane. FIGURE 9. FOUR CHANNEL VIDEO MULTIPLEXER +- U1A +- U1B +- +- VIDEO INPUT #1 VIDEO OUTPUT 75 LOAD R4 75 3 2 4 R1 75 R3 681 R5 2000 R2 681 TO 1 R6 75 R8 681 R7 681 R9 75 10 8 9 7 R10 2000 1 R21 100 2 3 4 VIDEO INPUT #3 R11 75 13 12 14 15 -5V 11 R13 681 R12 681 R15 2000 R14 75 +5V S1 ALL OFF VIDEO INPUT #4 R16 75 18 19 17 6 20 R19 75 R20 2000 R17 681 R18 681 U1C U1D +5V +5V IN +5V 0.1 F 10 F0.1F10F -5V IN -5V 100 (NOTE 17) 100 (NOTE 17) 100 (NOTE 17) 100 (NOTE 17) |
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