Information
Application Information
External Components
V
DD
C
1
XTAL/CLOCK
XTAL/CLOCK
X
1
XTAL
CLOCK OUT
1
2
3
4
5
6
16
15
14
V
DD
SYSTEM
V
SS
For use with a Clock Pulse input
- Remove Xtal (X
1
)
- Connect Pin 1 to V
DD
- Remove link (Pins 3/4)
- Input clock pulses to
CLOCK IN
PACKET MODE OUTPUT
CLOCK IN
CLOCK IN
FX631DW
13
12
11
10
TONE FOLLOWER OUTPUT
AMP OUT
SIGNAL IN (-)
R
1
C
3
R
2
R
3
C
4
V
BIAS
V
SS
7
8
SIGNAL IN (+)
9
R
4
C
2
V
SS
Fig.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 Graphs (Figures 4 and 5).
Whilst calculating input gain components, for
correct operation, it is recommended that the values
of resistors R
1
and R
4
are always greater than, or
equal to, 33kΩ.
2. Refer to following pages for advice on Microcircuit
Protection from high and spurious line voltages.
Differential Input
Common Mode Input
INPUT AMP
INPUT AMP
Ring (b)
V
BIAS
V
BIAS
V
SS
V
SS
Fig.3 Example Input Configurations
3
+
-
+
-
Tip (a)
CMLMICRO [ CML MICROCIRCUITS ]
