CMX881(2002) データシートの表示（PDF） - CML Microsystems Plc

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CMX881
(Rev.:2002)

Baseband Processor for PMR and Trunked Radios

CML Microsystems Plc 

PMR Signalling Processor

CMX881

1.4.2 Modulator Outputs

The combination of CMX881 and the modulator output components, R3/C3 and R4/C4, achieve roll-off

rates better than –60dB/decade. If required this can be increased to better than –100dB/decade by

replacing R3/C3 and R4/C4 with the active filter circuit shown in Figure 4.

C17/C19

MOD_1 & 2

R11/R13

R12/R14

+

C16/C18

-

VSS(A)

Modulator 1 & 2

Figure 4 Modulator output components to achieve -100dB/decade roll-off

R11 120kΩ

R12 120kΩ

R13 120kΩ

R14 120kΩ

C16 220pF

C17 440pF

C18 220pF

C19 440pF

(2 x C16)

(2 x C18)

Resistors ±5%, capacitors and inductors ±20% unless otherwise stated.

Notes:

8. The external op-amp must be chosen to ensure that the required signal output level can be driven

within acceptable distortion limits.

© 2002 CML Microsystems Plc

11

D/881/2

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