HFC-SPCI Cologne Chip AG, HFC-SPCI Datasheet - Page 50

• Manufacturer Part Number: HFC-SPCI
• Description: Isdn S/t HDLC Basic Rate Controller
• Manufacturer: Cologne Chip AG

7.2
Figure 10: External transmitter circuitry
Part List
VDD
R1
R2
R3, R3'
R4
R5
R6
R7
R8
*)
% _V &$
TX1_HI
T X 2 _ L O
value is depending on the used S/T module
External transmitter circuitry
*)
R 1
R 2
5V
2.2 k
3.0 k
18
100
5.6 k
3.3 k
3.3 k
2.2 k
:
:
: †
: †
:
:
:
:
T2
1%
1%
T1
T3
R 3
3.3V
560
3.9 k
18

3.3 k
2.2 k
1.8 k
2.2 k
0
:
:
R 4
: †
: †
:
:
:
:
R 7
R 8
1%
1%
G N D
R3´
R 6
T1´
D 2
D 4
T2´
C 3
Z D 1
R 5
C3
D2, D3
D4, D5
ZD1
T1, T1'
T2, T2'
T3
S/T module
D 3
D 5
R1´
R2´
T X _ E N
T X 1 _ L O
TX2_HI
G N D
V D D
see Table 3 on page 52.
470 pF
1N4148 or LL4148
1N4148 or LL4148
Z-Diode 2.7 V
(e. g. BZV 55C 2V7)
BC550C, BC850C or similar
BC550C, BC850C or similar
BC560C, BC860C or similar
9
8
7
S/T module
6URbeQbi !)))
18
1
3
TX +
TX -
S/T side