Baza Porad Serwisowych
LC7385, LC7385M - odbiornik DTMF- schemat blokowy
VSS EST ST/GT
VREF
VDD
18 9 4 16 17
STD
-
Bias
Timer
15
generator
+ controller
PD 6
Q4
Bias generator
14
Upper-range
Frequency
~
bandpass
detector
filter Q3
13
Code
Signal
IN+
1 Dial-tone discri- Converter
Anti-aliasing
+
filter filter Q2
and
IN- - minator
2
12
latch
GS
3 Lower-range
Frequency
Q1
~
bandpass filter
detector
11
VDD
Timming
generator
10
7 8 5
OSC1 OSC2 TOE
B/H
SERWIS ELEKTRONIKI