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參數(shù)資料
| 型號(hào)： | 1340TNPC |
| 英文描述： | 128 x 64 pixel format, LED Backlight available |
| 中文描述： | 1340型光波接收機(jī) |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大小： | 175K |
| 代理商： | 1340TNPC |
4
Agere Systems Inc.
Data Sheet
January 2000
1340-Type Lightwave Receiver
Data and Flag Outputs (continued)
The FLAG and FLAG outputs of the OC-3/STM-1
155 Mbits/s version of the 1340 receiver are PECL
logic levels driven by open emitter transistors with the
same characteristics as the data outputs. These out-
puts must be properly terminated in order to obtain the
correct logic levels. Since the FLAG function is basi-
cally a dc switch that indicates the loss of optical input
signal, it can be interfaced to much slower TTL or
CMOS logic circuits.
The circuit shown in Figure 2 provides one example of
how to create a TTL logic output from the PECL FLAG
output signal. The outputs of the LT1016 are TTL-com-
patible and provide both true and inverted logic levels.
The Q output of this circuit will be a TTL high (>2.5 V)
when the 1340 is receiving an optical signal greater
than the FLAG switching threshold and will be a TTL
low (<0.4 V) whenever the optical signal is absent or is
below the FLAG switching threshold. The FLAG and
FLAG outputs of the OC-12/STM-4 and 1.25 Gbits/s
receivers are 5 V TTL logic level compatible. The FLAG
output is provided directly by the comparator IC. How-
ever, the FLAG output is derived from the FLAG output
through an inverter. Excessive loading of the FLAG out-
put can cause the FLAG output to malfunction.
1-800(C).a
* Part available from Linear Technology Corporation of Milpitas, CA 95035.
Figure 2. Converting PECL FLAG Outputs to TTL
11
12
14
10 k
TTL (TRUE)
TTL (INVERTED)
LT1016*
1340
RX
FLAG
+5 V
10 k
+
–
Q
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 1340-TYPE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Lightwave Receiver |
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