FX829 Datasheet, PDF (7/34 Pages) CML Microcircuits – Baseband Signal Processor

Baseband Signal Processor
1.4 External Components
FX829
C1 22pF
C2 22pF
C3 68pF
C4 0.1µF
C5 0.1µF
C6 100pF
C7 0.1µF
C8 Note 2
C9 5.6nF
±20%
±20%
±20%
±20%
±10%
±20%
±20%
±20%
±20%
R1 1MW ±5%
R2 Note 1 ±10%
R3 Note 1 ±10%
R4 100kW ±10%
R5 100kW ±10%
R6 Note 2 ±10%
R7 22kW ±10%
X1 4.032MHz ±100ppm
Notes:
1. R2, R3, R4 and C3 form the gain components for the Summing Amplifier (AMP2).
R2 and R3 should be chosen as required from the system specification, using the
following formulae:
Audio Gain =
R4
−
R3
DTMF Gain =
R4
−
R2
2. R5, R6, C6 and C8 form the gain components for the Rx Input Amplifier (AMP1).
R6 should be chosen as required by the signal level, using the following formula:
Gain
= − ^R5
R6
C8 x R6 should be chosen so as not to compromise the low frequency performance of
this product.
Figure 2 Recommended External Components
© 1997 Consumer Microcircuits Limited
7
D/829/4