LTC1482 Просмотр технического описания (PDF) - Linear Technology
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LTC1482 Datasheet PDF : 16 Pages
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LTC1482
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output High Voltage vs
Output Current
5.0
4.5 VCC = 4.75V
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–100 –90 –80 –70 –60 –50 –40 –30 –20 –10 0
OUTPUT CURRENT (mA)
1482 G31
Driver Skew vs Temperature
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G34
Driver Output Low Voltage vs
Output Current
3.0
VCC = 4.75V
2.5
2.0
1.5
1.0
0.5
0
0 10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
1482 G32
Driver Propagation Delay vs
Supply Voltage
40
TA = 25°C
35
tPHL
30
tPLH
25
20
15
10
5
0
4.5
4.75
5
5.25
5.5
SUPPLY VOLTAGE (V)
1482 G35
Driver Propagation Delay vs
Temperature
40
VCC = 5V
35
tPLH
30
tPHL
25
20
15
10
5
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G33
Driver Short-Circuit Current vs
Temperature
250
VCC = 5.25V
200
150
DRIVER OUTPUT HIGH
SHORT TO –7V
100
DRIVER OUTPUT LOW
SHORT TO 10V
50
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G36
PIN FUNCTIONS
RO (Pin 1): Receiver Output. If a carrier is present (CD low)
and the part is not in shutdown, RO is high if the receiver
input differential voltage (A – B) ≥ VTHRO(MAX) and low if
(A – B) ≤ VTHRO(MIN). RO is forced to high (fail-safe state)
if a carrier is not present (CD = 1). In shutdown, RO is
three-stated. If the driver is enabled, RO follows the logic
level at the driver input.
CD (Pin 2): Open-Drain Carrier Detect Output. Provided
that the part is not in shutdown, the CD output is low if
VTHCD(MIN) ≥ (A – B) ≥ VTHCD(MAX) and high if VTHCD(MIN)
< (A – B) < VTHCD(MAX). This is true regardless of whether
the A and B pins are driven by the internal (DE = 1) or an
external (DE = 0) driver. A weak internal pull-up removes
the need for an external pull-up resistor if fast rise times
are not important. Several LTC1482s can share the same
CD line. CD = 1 forces RO to the high fail-safe state. In
shutdown, CD is three-stated. This pin can be pulled above
VCC but should not be taken above 8V to avoid damage.
DE (Pin 3): Driver Enable Input. DE = 0 disables or three-
states the driver outputs. DE = 1 enables the driver outputs
with the high/low state of the outputs set by DI/SHDN.
DI/SHDN (Pin 4): Driver Input and Shutdown Input. It is
used together with the DE pin to put the part in shutdown
8
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