LTC1480 Просмотр технического описания (PDF) - Linear Technology
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LTC1480 Datasheet PDF : 8 Pages
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UU
FU CTIO TABLES
LTC1480 Transmitting
INPUTS
RE
DE
DI
X
1
1
X
1
0
0
0
X
1
0
X
*Shutdown mode
OUTPUTS
B
A
0
1
1
0
Z
Z
Z*
Z*
LTC1480
LTC1480 Receiving
INPUTS
RE
DE
A–B
0
0
≥ 0.2V
0
0
≤ – 0.2V
0
0 Inputs Open
1
0
X
*Shutdown mode
OUTPUTS
RO
1
0
1
Z*
TEST CIRCUITS
A
R
VOD
B
R
1480 F01
VOC
Figure 1. Driver DC Test Load
RECEIVER
OUTPUT
TEST POINT
S1
CRL
1k
S2
1k
VCC
1480 F02
Figure 2. Receiver Timing Test Load
3V
DE
A
DI LTC1480
DRIVER
B
RDIFF
A
CL1
LTC1480
B RECEIVER
CL2
RE
RO
15pF
1480 F03
Figure 3. Driver/Receiver Timing Test Circuit
OUTPUT
UNDER TEST
500Ω
CL
S1
VCC
S2
1480 F04
Figure 4. Driver Timing Test Load
UW
W
SWITCHI G TI E WAVEFOR S
3V
DI
0V
B
A
VO
0V
– VO
1.5V
f = 1MHz, tr ≤ 10ns, tf ≤ 10ns
t PLH
VO
1/2 VO
10%
tr
tSKEW
90%
VDIFF = V(A) – V(B)
1.5V
t PHL
1/2 VO
t SKEW
90%
10%
tf
Figure 5. Driver Propagation Delays
1480 F05
1480fa
5
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