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参数资料
| 型号： | LTC1323CSW |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 通用总线功能 |
| 英文描述： | Single 5V AppleTalk Transceiver |
| 中文描述： | LINE TRANSCEIVER, PDSO24 |
| 封装： | 0.300 INCH, PLASTIC, SO-24 |
| 文件页数： | 11/12页 |
| 文件大小： | 284K |
| 代理商： | LTC1323CSW |
11
LTC1323
Driving an External Load from V
EE
An external load may be connected between ground and
the V
EE
pin as shown in Figure 15. The LTC1323 V
EE
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 V
EE
bypass capacitor should be in-
creased to 4.7
μ
F. Both LTC1323 and the external chip
should have separate V
CC
bypass capacitors but can
share the V
EE
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
APPLICATIU
U
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
to keep the
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
GND
V
CC
V
EE
I
VEE
12
24
21
1
μ
F
4.7
μ
F
LTC1323 F15
–5.5V
≤
V
EE
≤
–4.5V
I
VEE
≤
10mA
13
LTC1323
V
CC
= 5V
C1
+
+
Figure 15
TX
15
14
13
16
0.33
μ
F
12
11
10
9
8
1
2
5
6
7
3
4
CHARGE PUMP
LTC1323CS
5V
LocalTalk
TRANSFORMER
RX
100pF
100pF
120
100pF
100pF
LTC1323 TA02
0.33
μ
F
SHDN
DATA IN
TX ENABLE
RX ENABLE
DATA OUT
1
μ
F
1
μ
F
+
+
Typical LocalTalk Connection
TYPICAL APPLICATIO
S
N
U
5
TO 10
5
TO 10
(a)
(b)
(c)
100pF
FERRITE BEAD
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1323CSW#PBF | 功能描述:IC TXRX EIA562 5V SINGLE 24-SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC1323CSW#TR | 功能描述:IC TXRX LOCALTALK/EIA562 24SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC1323CSW#TRPBF | 功能描述:IC TXRX EIA562 5V SINGLE 24-SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LTC1324CS | 功能描述:IC TXRX LOCALTALK 5V SNGL 16SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,140 系列:AU 类型:收发器 驱动器/接收器数:1/1 规程:CAN 电源电压:5.3 V ~ 27 V 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:管件 其它名称:935267940512AU5790D14AU5790D14-ND |
| LTC1324CS#PBF | 功能描述:IC TXRX LOCALTALK 5V SNGL 16SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,140 系列:AU 类型:收发器 驱动器/接收器数:1/1 规程:CAN 电源电压:5.3 V ~ 27 V 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:管件 其它名称:935267940512AU5790D14AU5790D14-ND |
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