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參數(shù)資料
| 型號： | LTC1323CSW#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX LOCALTALK/EIA562 24SOIC |
| 標準包裝： | 1,000 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | AppleTalk |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SOIC |
| 包裝： | 帶卷 (TR) |
11
LTC1323
Driving an External Load from VEE
An external load may be connected between ground and
the VEE pin as shown in Figure 15. The LTC1323 VEE pin
will sink up to a maximum of 10mA while maintaining the
pin voltage between – 4.5V and – 5.5V. If an external load
is connected, the VEE bypass capacitor should be in-
creased to 4.7
F. Both LTC1323 and the external chip
should have separate VCC bypass capacitors but can
share the VEE capacitor.
EMI Filter
Most LocalTalk applications use an electromagnetic inter-
ference (EMI) filter consisting of a resistor-capacitor T
network between each driver and receiver and the connec-
tor. Unfortunately, the resistors significantly attenuate the
drivers output signals before they reach the cable. Because
APPLICATIO S I FOR ATIO
UU
W
U
the LTC1323 uses a single supply differential driver, the
resistor values should be reduced to 5
to 10 to guaran-
tee adequate voltage swing on the cable (Figure 16a). In
most applications, removing the resistors completely does
not cause an increase in EMI as long as a shielded connec-
tor and cable are used (Figure 16b). With the resistors
removed the only DC load is the primary resistance of the
LocalTalk transformer. This will increase the DC standby
current when the driver outputs are active, but does not
adversely affect the drivers because they can handle a
direct indefinite short circuits without damage. Trans-
former primary resistance should be above 15
tokeepthe
LTC1323 operating normally and prevent it from entering
thermal shutdown. For maximum swing and EMI immu-
nity, a ferrite bead and capacitor T network can be used
(Figure 16c).
Figure 16. EMI Filters
EXTERNAL
CHIP
VCC
VEE
IVEE
GND
12
24
21
1
F
4.7
F
LTC1323 F15
–5.5V
≤ VEE ≤ –4.5V
IVEE ≤ 10mA
13
LTC1323
VCC = 5V
C1
+
Figure 15
TX
15
16
0.33
F
14
13
12
11
10
9
8
1
2
5
6
7
3
4
CHARGE PUMP
LTC1323CS
5V
LocalTalk
TRANSFORMER
RX
100pF
120
100pF
LTC1323 TA02
0.33
F
SHDN
DATA IN
TX ENABLE
RX ENABLE
DATA OUT
1
F
1
F
+
Typical LocalTalk Connection
TYPICAL APPLICATIONS N
U
5
TO 10
5
TO 10
(a)
(b)
(c)
100pF
FERRITE BEAD
100pF
LTC1323 F16
100pF
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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