Tone Detector
FX105A
1.4
External Components
C
1A
C
1B
C
2A
C
2B
C
3A
C
3B
C
4
C
5
C
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
See section 1.6
0.27µF ±20%
0.1µF
±20%
R
1F
R
1V
R
2
R
L
R
V
R
W
D
1
See section 1.6
See section 1.6
See section 1.6
20kohm
±20%
See section 1.6
See section 1.6
IN914 or similar
Note s:
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 V
DD
instead of V
SS
.
3. For improved de-response time, a diode (D
1
) may be added.
4. Any value load resistance (R
L
) may be used, providing the maximum load current does
not exceed the value given in section 1.7.1
Figure 2 Recommended External Components
©
1999 Consumer Microcircuits Limited
5
D/105A/5
CMLMICRO [ CML MICROCIRCUITS ]
