AMD
Fig u re 1 2
Crys t a l Filt e r
+5 V
SEROUT +
SEROUT -
SERIN +
SERIN -
SEROUT +
SEROUT -
SERIN +
SERIN -
300
300
2
Am7968
Transmitter
Am7969
Receiver
Am7968
Transmitter
Am7969
Receiver
X1
X2
1 µF
+
1
300
7
4 pF
300
CLK
CLK
CLK
CLK
X1
X2
X1
X2
LT1016
-
X1
X2
3
4
5 6
GND
Crystal Filter
12330E-41
Note: All crystals used are of same type.
Fig u re 1 3
P LL Filt e r
+5 V
1 µF
50
GND
SEROUT +
SEROUT –
SERIN +
SERIN –
V
CC
15K
15K
15K
VCM2
V
CC
GND
U1
MC4044
D1
-
V
GND
MC4024
VCX2
V+
Am7969
TAXI
Receiver
Am7968
TAXI
Transmitter
LMC660C
V-
+
15K
4.7K
50 pF
X1
CLK
R
OUT 2
X1
X2
CX2
GND
GNGDND
CLK
4.7K
50
1 µF
X2
GND
Notes:
12330E-42
1. Filter components were chosen for the following loop parameters:
Noise Bandwidth = 10 kHz
Damping Factor = 0.5
Natural Frequency = 3.18 kHz
2. Refer to Motorola MC4024, MC4044 and National LMC660C data sheets for specifications.
106
TAXIchip Integrated Circuits Technical Manual
AMD [ AMD ]
