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FX980 Datasheet(PDF) 6 Page - CML Microcircuits |
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FX980 Datasheet(HTML) 6 Page - CML Microcircuits |
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6 / 86 page  TETRA Baseband Processor FX980 © 1997 Consumer Microcircuits Limited 6 D/980/3 1.4 External Components Rx Inputs When using the internal anti-alias filter, the following is suggested Example values: R1 = 220 Ω C1 = 1.5nF (R1, C1 precise values are not critical) (-3dB at 240kHz) R2 = 408 Ω C2 = 3.9nF (R2 x C2 time constant should be preserved) (-3dB at 50kHz) When not using the internal anti alias filter, it is suggested that the user should follow the guidelines in Section 1.5.3.1. In both cases, there should be at least one filter pole close to the chip inputs. Figure 2a Recommended External Components - Rx Inputs Tx Outputs Example values: R3 = 220 Ω C3 = 1nF Decoupling capacitors should be employed as detailed in Section 1.5.1 Figure 2b Recommended External Components - Tx Outputs AGC IRXP IRXN QRXP QRXN Filter 1 R2 R2 C2 R2 R2 C2 R1 R1 R3 R1 C1 C1 R1 C3 ITXP ITXN QTXP QTXN R3 C3 R3 R3 C3 C3 |
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