FX980L7 Просмотр технического описания (PDF) - CML Microsystems Plc
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FX980L7 Datasheet PDF : 86 Pages
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TETRA Baseband Processor
1.4 External Components
Rx Inputs
When using the internal anti-alias filter, the following is suggested
R2
R1
R2 C2
R1 C1
Filter 1
R2
C2
R2
AGC
R1
R1 C1
IRXP
IRXN
QRXP
QRXN
FX980
Example values:
R1 = 220Ω
R2 = 408Ω
C1 = 1.5nF (R1, C1 precise values are not critical) (-3dB at 240kHz)
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
R3
ITXP
C3
R3
ITXN
C3
R3
QTXP
C3
R3
QTXN
C3
Example values:
R3 = 220Ω
C3 = 1nF
Decoupling capacitors should be employed as detailed in Section 1.5.1
Figure 2b Recommended External Components - Tx Outputs
© 1997 Consumer Microcircuits Limited
6
D/980/3
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