CMX673D4 CML Microcircuits, CMX673D4 Datasheet - Page 8

• Manufacturer Part Number: CMX673D4
• Description: DTMF Receiver, 3.58MHz, 5V, CMOS, 16-SOIC
• Manufacturer: CML Microcircuits

1.6
1.6.1
X1
R1
R2
R3
R4
Note:
An alternative set of component values can be used:
R1
R2
R3
R4
Note:
2001 Consumer Microcircuits Limited
XTAL/CLOCK
470k
470k
240k
470k
499k
499k
54.9k
499k
Application Notes
General
On power-up, it will take 80ms to initialise the internal state, this delay should be accounted for
before the DETECT output is valid.
1. Resistors
2. A low offset opamp is needed.
3. Resistors 1%, Capacitors 2% unless otherwise stated.
4. A higher value of C3 and C4 will reduce the level sensitivity tolerance at around -38dBm.
DETECT
ENABLE
XTALN
1
2
3
4
CMX673P1
Figure 3 A typical Telephone Line Circuit Application
1%, Capacitors 20% unless otherwise stated.
R5
C3
C4
R5
C3
C4
8
7
6
5
160k
0.01µF 250V
0.01µF 250V
49.9k
0.001µF 300V
0.001µF 300V
VREF
SIGIN
C2
8
_
+
R3
R5
R2
R1
R4
C4
C3
D/673/5
Phone
Line