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參數(shù)資料
| 型號： | MT8930CE |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | Subscriber Network Interface Circuit |
| 中文描述： | DATACOM, DIGITAL SLIC, PDIP28 |
| 封裝： | PLASTIC, MS-011AB, DIP-28 |
| 文件頁數(shù)： | 29/41頁 |
| 文件大?。?/td> | 2516K |
| 代理商： | MT8930CE |
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Data Sheet
MT8930C
29
In Figure 21, two types of diodes (germanium 1N270
or schottky MBD301) can be used for D5,6. 1N270
will leave more margin for pulse template and
longitudinal conversion loss. However, MBD301 will
leave more margin for impedance template. All other
components are as described previously for Figure
20.
The VAC Transformers are available from:
Germany
Vacuumschmelze GMBH
Postfach 22 53
D-63412 Hanau
Telephone: (49) 6181 380
Canada
Votron Electronic Ltd.
250 Rayette Road
Concord, Ontario L4K 2G6
Telephone: (905) 669-9870
USA
Vacuumschmelze Corporation
4027 Will Rogers Parkway
Oklahoma City, OK 73108
Telephone: (405) 943-9651
Proprietary NT&TE Line Interface
For
requirements such as ETS 300-012 do not have to
be met, the line interface circuit may be simpler and
consequently less expensive. Figure 23 shows such
a line interface circuit. R1 should be chosen
according to the transformer selected and the
desired output signal level, typical values of R1 may
vary from 30
to 75
. Numerous types of
transformers may be used, including the following:
proprietary
applications,
where
stringent
APC
Filtran
Filtran
Pulse
VAC
8016D (dual with common mode choke)
TEW-5660 (surface mount)
TPW-3852-4 (single)
PE-65495 (dual)
L4097-X028-80 (single)
In Figure 22, everything is the same as in Figure 21,
except transformer pin out.
Figure 20 - ETS 300-012 NT & TE Line Interface for Filtran TPW-3852-4
V
DD
C1
V
DD
LTx
D5
D6
V
DD
D1
D2
5
4
3
T1
6
1
2
V
Bias
V
DD
5
4
3
L1
6
1
2
R2
R3
T2
K1
K1
V
DD
D3
D4
R1
LRx
V
SS
C3
C4
MT8930C
+
C2
Tx+
Tx-
Rx-
Rx+
D7
K1
V
DD
Parts List:
C1, 3 = 0.1
μ
F Ceramic
C2 = 10
μ
F Tantalum
C4 = 22pF
D1-4 = IN914
D5, 6 = IN270 Germanium
D7 = IN4003
K1 = 2 Form A or C Relay
(eg., Aromat TQ2E-5V)
L1 = VAC N4025-X034
R1 = 3k01 1%
R2, 3 = 100
1%
T1, 2 = Filtran TPW-3852-4
6
7
9
10
5
4
2
1
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