LTC1685 查看數據表（PDF） - Linear Technology
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LTC1685 Datasheet PDF : 12 Pages
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LTC1685
FU CTIO
Transmitting
INPUTS
RE
DE
X
1
X
1
X
0
X
1
TABLES
LINE
DI
CONDITION
1
No Fault
0
No Fault
X
X
X
Fault
OUTPUTS
B
A
0
1
1
0
Hi-Z
Hi-Z
±10mA Current Source
Receiving
INPUTS
RE
DE
0
0
0
0
0
0
0
0
1
X
A–B
≥ 300mV
≤ – 300mV
Inputs Open
Inputs Shorted Together
A = B = – 7V to 12V
X
OUTPUT
RO
1
0
1
1
Hi-Z
TEST CIRCUITS
A
R
VOD
R VOC
B
1685 F01
Figure 1. Driver DC Test Load
3V
DE
A
DI
B
RDIFF
A
CL1
B
CL2
RO
RE
15pF
1685 F03
Figure 3. Driver/Receiver Timing Test Circuit
TEST POINT
S1
RECEIVER
OUTPUT
CL
15pF
1k
S2
1k
VDD
1685 F02
Figure 2. Driver DC Test Load
OUTPUT
UNDER TEST
500Ω
CL
S1
VDD
S2
1685 F04
Figure 4. Driver Timing Test Load #2
6
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