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PDF LH1514AB Data sheet ( Hoja de datos )

Número de pieza LH1514AB
Descripción Solid State Relay High Frequency
Fabricantes Vishay Siliconix 
Logotipo Vishay Siliconix Logotipo



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No Preview Available ! LH1514AB Hoja de datos, Descripción, Manual

FEATURES
• Load Voltage, 15 V
• Load Current, 150 mA
• Switching Capability up to 50 MHz
• Blocking Capability Dependent upon
Signal dv/dt
• Low and Typical RON 5.0
• 1.0 ms Actuation Time
www.DataSheeLt4oUw.cPomower Consumption
• 3750 VRMS I/O Isolation
• Balanced Switching
• Linear AC/DC Operation
• Clean, Bounce-free Switching
• Surface-mountable
AGENCY APPROVALS
• UL – File No. E52744
• CSA – Certification 093751
• VDE 0884 Approval
APPLICATIONS
• Protection Switching (T1 sparing)
– Digital Access Cross Connects
– D-type Channel Breaks
– Intraoffice Data Routing
• Transmission Switching
– T1 Multiplexing
– DSO (64 Kbits/s)
– DS1 (1.544 Mbits/s)
– E1, DS1A (2.048 Mbits/s)
– DS1C (3.152 Mbits/s)
– DS2 (6.312 Mbits/s)
• Instrumentation
– Scanners
– Testers
– Measurement Equipment
• See Application Note
Part Identification
Part Number
LH1514AB
LH1514AAC
LH1514AACTR
Description
8-pin DIP, Tubes
8-pin SMD, Gullwing, Tubes
8-pin SMD, Gullwing, Tape and
Reel
LH1514AB/AAC/AACTR
2 Form A
Solid State Relay
High Frequency
Package Dimensions in Inches (mm)
DIP
pin one ID
4 321
.268 (6.81)
.255 (6.48)
S1
8
5 678
.045 (1.14)
.030 (0.76)
4° typ.
.050 (1.27)
.022 (.56)
.018 (.46)
SMD
.390 (9.91)
.379 (9.63)
1
.031 (0.79)
.150 (3.81)
.130 (3.30)
.035 (.89)
.020 (.51)
.100 (2.54) typ.
Pin one I.D.
S1' S2
76
S2'
5 S1
S2
S1'
S2'
23
4
.300 (7.62)
typ.
10°
3°–9°
.012 (.30)
.008 (.20)
.250 (6.35)
.230 (5.84)
.130 (3.30)
.110 (2.79)
.268 (6.81)
.255 (6.48)
.390 (9.91)
.379 (9.63)
.045 (1.14)
.030 (0.78)
.031 (.79)
typ.
.150 (3.81)
.130 (3.30)
Radius
.395 (10.03)
.375 (9.52)
.312 (7.80)
.298 (7.52)
4°
typ.
.050
(1.27)
typ.
.008 (.25)
.004 (.10)
.100 (2.54)
typ.
.040 (1.02)
.020 (.51)
10°
.315
(8.00)
typ.
3° to 7°
.010
(2.54)
typ.
DESCRIPTION
The LH1514 is a DPST normally open (2 Form A) SSR that can be
used in balanced high-frequency applications like T1 switching. With
its low ON-resistance and high actuation rate, the LH1514 is also very
attractive as a general-purpose 2 Form A SSR for balanced signals.
The relays are constructed using a GaAlAs LED for actuation control
and an integrated monolithic die for the switch output. The die, fabri-
cated in a dielectrically isolated Smart Power BiCMOS, is comprised
of a photodiode array, switch control circuitry, and NMOS switches.
In balanced switching applications, internal circuitry shunts high-fre-
quency signals between two poles when the SSR is off. This bal-
anced T termination technique provides high isolation for the load.
Document Number: 83814
Revision 17-August-01
www.vishay.com
3–72

1 page




LH1514AB pdf
Functional Description
Figure 12 shows the switch characteristics of the relay. The
relay exhibits an ON-resistance that is exceptionally linear up
to the knee current (IK). Beyond IK, the incremental resistance
decreases, minimizing internal power dissipation.
In a 2 Form A relay, to turn the relay on, forward current is
applied to the LED. The amount of current applied determines
the amount of light produced for the photodiode array.
This photodiode array develops a drive voltage for both NMOS
switch outputs. For high-temperature or high-load current
operations, more LED current is required.
For high-frequency applications, the LH1514 must be wired as
shown in the Figure 15 application diagram to minimize trans-
mission crosstalk and bleed-through. A single LH1514 pack-
age switches a single transmit twisted pair or a single receive
www.DataShteweits4tUed.copmair. In this configuration when the SSR is turned off,
the SSR parries high-frequency signals by shunting them
through the SSR, thereby isolating the transformer load.
When switching alternate mark inversion (AMI) coding trans-
mission, the most critical SSR parameter is dv/dt bleed-
through. This bleed-through is a result of the rise and fall time
slew rates of the 3.0 V AMI pulses. The test circuit in Figure 13
illustrates these bleed-through glitches. It is important to rec-
ognize that the transmission limitations of the LH1514 are
bleed-through related and not frequency related. The maxi-
mum frequency the LH1514 SSR can switch will be determined
by the pulse rise and fall times and the sensitivity of the receive
electronics to the resultant bleed-through.
At data rates above 2.0 Mbits/s, the 50 pF pole-to-pole capaci-
tance of the LH1514 should be considered when analyzing the
load match to the transmission line. Please refer to the T1
Switching with the LH1514 SSR Application Note for further
information on load-matching and off-state blocking.
Figure 11. Pin Diagram and Pin Outs
CONTROL +
CONTROL +
CONTROL
18
27
DPST
36
S1
S1'
S2
BLANK 4
5 S2'
Figure 12. Typical ON Characteristics
+I
150 mA
IL(max)
4.0
60 mA
IK
0.3 V
5.0
V
0.3 V
+V
60 mA
IK
IL(max)
150 mA
I
Test Circuit
Figure 13. Off-state Bleed-through
tr 5.0 ns
tf 5.0 ns
f = 1.5 MHz
3.0 V
NC 1
NC 2
NC 3
NC 4
8
7
50 *
6
5
100 mV
max
100 mV
max
* 50 load is derived from T1 applications where a 100 load is paralleled with a 100 line.
Document Number: 83814
Revision 17-August-01
www.vishay.com
3–76

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