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LTC490 Datasheet(Fiches technique) 5 Page - Linear Technology

Numéro de pièce LTC490
Description  Differential Driver and Receiver Pair
Télécharger  8 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
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5
LTC490
Figure 4. Receiver Propagation Delays
Figure 3. Driver Propagation Delays
TI E WAVEFOR
S
G
WITCHI
S
S
APPLICATI
I FOR ATIO
Typical Application
A typical connection of the LTC490 is shown in Figure 5.
Two twisted-pair wires connect two driver/receiver pairs
for full duplex data transmission. Note that the driver and
receiver outputs are always enabled. If the outputs must be
disabled, use the LTC491.
There are no restrictions on where the chips are con-
nected, and it isn’t necessary to have the chips connected
at the ends of the wire. However, the wires must be
terminated only at the ends with a resistor equal to their
characteristic impedance, typically 120
Ω. Because only
Figure 5. Typical Connection
LTC490 • TA06
120
120
SHIELD
LTC490
DRIVER
RECEIVER
LTC490
DRIVER
DX
RX
DX
RX
2
3
5
6
7
8
RECEIVER
+
0.01
µF
1
4
5V
SHIELD
8
7
6
5
+
0.01
µF
5V
4
2
3
1
VOL
LTC490 • TA05
A-B
VOD2
0V
tPLH
0V
OUTPUT
VOH
1.5V
f = 1MHz ; tr ≤ 10ns : tf ≤ 10ns
tPHL
–VOD2
1.5V
INPUT
R
–VO
LTC490 • TA04
D
3V
0V
1.5V
tPLH
1.5V
VDIFF = V(Y) – V(Z)
VO
80%
20%
50%
10%
Z
Y
tSKEW
tr
f = 1MHz : tr ≤ 10ns : tf ≤ 10ns
90%
50%
tPHL
tf
VO
tSKEW
1/2 VO
1/2 VO




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