279
11.4
Typical Use
Figure 11.5 shows an example of the use of the DTMF generator.
TONED
VT
ref
P1
4
H8/3637
DTMF
V
MUTE
ref1
HA16808ANT
19
20
11
2 k
Ω
+0.47
µ
F
100 k
Ω
360 k
Ω
24 k
Ω
2SC458
Note: Numbers at ends of signal lines are pin numbers of HA16808ANT.
Figure 11.5 Connection to HA16808 ANT
11.5
Application Notes
When using the DTMF generator, note the following point:
Be sure that the DTLR setting (DTL4 to DTL0) matches the system clock frequency at the OSC
pins. Normal DTMF signal output frequencies will not be obtained unless the DTLR setting
matches the OSC frequency.