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OPA875IDGKRG4 Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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OPA875IDGKRG4 Datasheet(HTML) 10 Page - Burr-Brown (TI) |
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10 / 21 page  www.ti.com 4-INPUT RGB ROUTER R 69W O OPA875 x1 x2 x1 R 1 R 2 EN R 69W O x1 x2 x1 R 3 Chip Select Red Out R 4 EN 75W x1 x2 x1 R OUT x1 x2 x1 G OUT x1 x2 x1 B OUT OPA875_A OPA875_B OPA875_C Ch0 Ch1 Ch0 Ch1 Ch0 Ch1 R =Z ||(R+R +R ) O F G O 1+ =2 R F R G (1) R +R =804 R =R W F G F G (2) OPA875_A Ch.1Driven,Adjacent ChannelCrosstalk 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 1 10 100 1G Frequency(MHz) Input-Referred OPA3875 AdjacentChannel Crosstalk OPA3875 AllHostile Crosstalk OPA875 AllHostile Crosstalk OPA875_C Ch.0Driven AdjacentChannelCrosstalk R = O 2 75 (n 1)+804 ´ - ´ 1+ [75 (n 1)+804] ´ - 2 241200 - 1 OPA875 SBOS340 – DECEMBER 2006 Two OPA875s can be used together to form a four-input RGB router. The router for the red component is shown in Figure 29. Figure 29. 4-Input RGB Router Figure 27. High Isolation RGB Video MUX When connecting OPA875 outputs together, maintain a gain of +1 at the load. The OPA875 operates at a gain of +6dB; thus, matching resistance must be selected to achieve –6dB attenuation. The set of equations to solve are shown in Equation 1 and Equation 2. Here, the impedance of interest is ZO = 75Ω. Solving for RO with n devices connected together, we get Equation 3: Figure 28. All-Hostile and Adjacent Channel Crosstalk The configuration of the three OPA875 devices used is shown in Figure 27. Note that for the test, the (3) OPA875_B was measured when both the OPA875_A and OPA875_C were driven for all hostile crosstalk and only the OPA875_A or OPA875_C was driven for the adjacent channel crosstalk. 10 Submit Documentation Feedback |
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