Low Voltage SPM Detector
3
MX631
Ap p lic a tion Inform a tion: Exte rna l Com p one nts
V
DD
V
DD
V
DD
XTAL/CLOCK
XTAL/CLOCK
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
C
1
X
1
SYSTEM
XTAL
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
PACKET MODE OUTPUT
CLOCK OUT
TONE FOLLOWER OUTPUT
CLOCK IN
CLOCK IN
MX631
R
1
AMP OUT
C
C
V
3
4
SIGNAL IN (-)
SIGNAL IN (+)
BIAS
R
2
V
SS
R
3
R
4
C
2
Figure 2 - Recommended External Components - Differential Input Mode
Co m p o ne nt
Va lue
Exte rna l Com p one nts
R1
R2
R3
R4
C1
C2
C3
C4
X1
RFEEDBACK
RIN (-)
1. The values of the Input Amp gain components
illustrated are calculated using the Input Gain
Calculation Graph (Figure 4).
RIN (+)
RBIAS
1.0µF ±20%
1.0µF ±20%
CIN(-)
When calculating input gain components, for
correct operation, it is recommended that the
values of resistors R1 and R4 do not go below
100kΩ.
CIN(+)
3.579545MHz
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
-
-
Tip (a)
+
+
Ring (b)
MX631
MX631
VBIAS
VBIAS
Figure 3 - Example Input Configurations
© 1997 MX•COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
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