Tone Detector
4
MX105A PRELIMINARY INFORMATION
2. Signal List
Pin No.
DW/P
1
2
3
4
Pin No.
LH
1
3
5
6
INPUT AMP IN
INPUT AMP OUT
R3
R2
input
output
input
input
AC couple to this input. Nominal input
impedance is 200 kΩ.
Nominal output impedance is 1 kΩ.
Detect filter resistor pin.
PLL loop filter resistor pin. For improved
performance C4 may be chosen to provide 30°
of phase shift at the loop filter input.
Detect filter capacitor pin A
Detect filter capacitor pin B
Loop filter capacitor pin A
Loop filter capacitor pin B
PMOS open drain output - active on detect.
Ground.
Bandwidth control resistor pin A
Bandwidth control resistor pin B
VCO capacitor B
VCO capacitor A
VCO discharge resistor. When potentiometer
tuning is required, a series resistor is
recommend to prevent possible shorting to
ground.
Power supply.
Name
Type
Description
5
6
7
8
9
10
11
12
13
14
15
7
8
10
11
13
14
16
17
19
20
22
C3
A
C3
B
C2
A
C2
B
DETECT OUT
V
SS
R4
A
R4
B
C1
B
C1
A
R1
output
output
output
output
output
power
input
input
output
output
input
16
24
V
DD
power
© 1997 MX•COM, INC.
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Doc.# 20480133.003
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