FX980L6 데이터 시트보기 (PDF) - CML Microsystems Plc

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FX980L6

TETRA Baseband Processor

CML Microsystems Plc 

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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