Family Radio CTCSS 'Type 2' Encoder and Decoder
CMX808A
1.4
External Components
C1 22pF
C2 22pF
C3 0.1µF
C4 0.1µF
C5 100pF
C6 0.1µF
C7 Note 1
C8 0.1µF
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
R1
R2
R3
±5%
1MΩ
22kΩ
100kΩ
±10%
±10%
±10%
R4 Note 1
X1 4.0MHz ±100ppm
Note: 1.
R3, R4, C5 and C7 form the gain components for the Rx Input Amplifier. R4 should be
chosen as required by the signal level, using the following formula:
R3
Gain
= −
R4
C7 x R4 should be chosen so as not to compromise the low frequency performance of this
product.
Figure 2 Recommended External Components
2003 CML Microsystems Plc
6
D/808A/6