Low Voltage SPM Detector
3
MX631
Application Information:
External Components
V
DD
V
DD
XTAL/CLOCK
XTAL/CLOCK
X
1
XTAL
CLOCK OUT
V
DD
1
2
3
4
5
16
SYSTEM
C
1
PACKET MODE OUTPUT
For use with a Clock-Pulse Input
- Remove Xtal (X1)
- Connect Pin 1 to VDD
- Remove link (Pins 3-4)
- Input clock pulses to CLOCK IN
15
14
TONE FOLLOWER OUTPUT
CLOCK IN
CLOCK IN
MX631
13
12
11
10
V
BIAS
V
SS
6
7
8
AMP OUT
SIGNAL IN (-)
SIGNAL IN (+)
R
1
C
3
R
2
R
3
C
4
9
R
4
C
2
Figure 2 - Recommended External Components - Differential Input Mode
Component
R
1
R
2
R
3
R
4
C
1
C
2
C
3
C
4
X
1
Value
R
FEEDBACK
R
IN (-)
R
IN (+)
R
BIAS
1.0µF ±20%
1.0µF ±20%
C
IN(-)
C
IN(+)
3.579545MHz
External Components
1. The values of the Input Amp gain components
illustrated are calculated using the Input Gain
Calculation Graph (Figure 4).
When calculating input gain components, for
correct operation, it is recommended that the
values of resistors R
1
and R
4
do not go below
100kΩ.
2. Refer to following pages for advice on IC
Protection from high and spurious line voltages.
Differential Input
Common Mode Input
INPUT AMP
INPUT AMP
Ring (b)
MX631
V
BIAS
V
BIAS
Figure 3 - Example Input Configurations
© 1997 MX•COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
Doc.# 20480087.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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+
MX631
-
+
-
Tip (a)
CMLMICRO [ CML MICROCIRCUITS ]
