Tone Detector
FX105A
1.4
External Components
C1A
C1B
C2A
C2B
C3A
C3B
C4
See section 1.6
See section 1.6
See section 1.6
See section 1.6
See section 1.6
See section 1.6
See section 1.6
0.27µF ±20%
R1F
R1V
R2
See section 1.6
See section 1.6
See section 1.6
RL
20kohm
±20%
RV
RW
D1
See section 1.6
See section 1.6
IN914 or similar
C5
C6
0.1µF
±20%
Notes:
1. For improved performance C4 may be chosen to provide 30° phase shift at the VCO
loop filter input.
2. For compatibility with the FX105P; capacitors (C1 .... C4) may be connected to VDD
instead of VSS
.
3. For improved de-response time, a diode (D1) may be added.
4. Any value load resistance (RL) may be used, providing the maximum load current does
not exceed the value given in section 1.7.1
Figure 2 Recommended External Components
ã 1999 Consumer Microcircuits Limited
5
D/105A/5
CMLMICRO [ CML MICROCIRCUITS ]
