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LT1712 Datasheet(PDF) 9 Page - Linear Technology

Part # LT1712
Description  Single/Dual 4.5ns, 3V/5V/5V, Rail-to-Rail Comparators
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1712 Datasheet(HTML) 9 Page - Linear Technology

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9
LT1711/LT1712
APPLICATIO S I FOR ATIO
+
50k
VIN
50
Q
Q
V+ = 5V
V= –5V
VHYST = 5mV
(ALL 3 CASES)
Q
Q
+
50k
VIN
VREF
50
Q
Q
+
100k
100k
VIN
+
VIN
50
50
171112 F02
LT1711
LT1711
LT1711
Figure 2. Various Configurations for Introducing Hysteresis
TYPICAL APPLICATIO S
+
1/2
LT1712
TxD
RxD
7
8
9
LE
6
5
49.9
750k
750k
100k
100k
49.9
2
1
15
3
16
13
14
3V
3V
4
11
12
R2A
2.55k
R3A
124
ROA
140
ROB
140
R1B
499
6-FEET
TWISTED PAIR
ZO ≈ 120Ω
R1D
499
R1C
499
R3B
124
R2C
2.55k
3V
100k
5
11
2
1
12
6
10
9
8
7
171112 F03
14
3
15
16 13
4
TxD
RxD
3V
R3C
124
R3D
124
R2D
2.55k
R2B
2.55k
R1A
499
10
+
1/2
LT1712
LE
+
750k
750k
49.9
49.9
100k
+
LE
1/2
LT1712
LE
1/2
LT1712
3V
3V
DIODES: BAV99
×4
Figure 3. 75Mbaud Full Duplex Interface on Two Wires
Simultaneous Full Duplex 75Mbaud Interface
with Only Two Wires
The circuit of Figure 3 shows a simple, fully bidirectional,
differential 2-wire interface that gives good results to
75Mbaud, using the LT1712. Eye diagrams under condi-
tions of unidirectional and bidirectional communication
are shown in Figures 4 and 5. Although not as pristine as
the unidirectional performance of Figure 4, the perfor-
mance under simultaneous bidirectional operation is still
excellent. Because the LT1712 input voltage range ex-
tends 100mV beyond both supply rails, the circuit works
with a full
±3V (one whole VS up or down) of ground
potential difference.
The circuit works well with the resistor values shown, but
other sets of values can be used. The starting point is the
characteristic impedance, ZO, of the twisted-pair cable.
The input impedance of the resistive network should
match the characteristic impedance and is given by:
RR
RR
R
RR
R
R
IN
O
O
=
+
++
[]
2
12
3
21
2
3
••
||(
)
•||(
)


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