5364IUZ(2007) Просмотр технического описания (PDF) - Intersil
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5364IUZ Datasheet PDF : 16 Pages
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EL5164, EL5165, EL5364
each EL5164, EL5165, and EL5364 amplifiers. Special
circuitry has been incorporated in the EL5164, EL5165, and
EL5364 to reduce the variation of output impedance with
current output. This results in dG and dP specifications of
0.01% and 0.01°, while driving 150Ω at a gain of 2.
Video performance has also been measured with a 500Ω load
at a gain of +1. Under these conditions, the EL5164, EL5165,
and EL5364 have dG and dP specifications of 0.01% and
0.01°, respectively.
Output Drive Capability
In spite of their low 5.5mA of supply current, the EL5164,
EL5165, and EL5364 are capable of providing a minimum of
±75mA of output current. With a minimum of ±75mA of output
drive, the EL5164, EL5165, and EL5364 are capable of
driving 50Ω loads to both rails, making it an excellent choice
for driving isolation transformers in telecommunications
applications.
Driving Cables and Capacitive Loads
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, the back-termination series resistor will
decouple the EL5164, EL5165, and EL5364 from the cable
and allow extensive capacitive drive. However, other
applications may have high capacitive loads without a
back-termination resistor. In these applications, a small
series resistor (usually between 5Ω and 50Ω) can be placed
in series with the output to eliminate most peaking. The gain
resistor (RG) can then be chosen to make up for any gain
loss which may be created by this additional resistor at the
output. In many cases it is also possible to simply increase
the value of the feedback resistor (RF) to reduce the
peaking.
Current Limiting
The EL5164, EL5165, and EL5364 have no internal
current-limiting circuitry. If the output is shorted, it is possible
to exceed the Absolute Maximum Rating for output current
or power dissipation, potentially resulting in the destruction
of the device.
Power Dissipation
With the high output drive capability of the EL5164, EL5165,
and EL5364, it is possible to exceed the +125°C Absolute
Maximum junction temperature under certain very high load
current conditions. Generally speaking when RL falls below
about 25Ω, it is important to calculate the maximum junction
temperature (TJMAX) for the application to determine if
power supply voltages, load conditions, or package type
need to be modified for the EL5164, EL5165, and EL5364 to
remain in the safe operating area. These parameters are
calculated in Equation 1:
TJMAX = TMAX + (θJA × n × PDMAX)
(EQ. 1)
where:
• TMAX = Maximum ambient temperature
• θJA = Thermal resistance of the package
• n = Number of amplifiers in the package
• PDMAX = Maximum power dissipation of each amplifier in
the package
PDMAX for each amplifier can be calculated in Equation 2:
PDMAX =
(2 × VS × ISMAX ) +
(VS
–
VOUTMAX
)
×
V-----O----U----T----M-----A----X--
RL
(EQ. 2)
where:
• VS = Supply voltage
• ISMAX = Maximum supply current of 1A
• VOUTMAX = Maximum output voltage (required)
• RL = Load resistance
Typical Application Circuits
0.1µF
+5V
IN+
IN-
-5V
VS+
OUT
VS-
0.1µF
375Ω
5Ω
0.1µF
+5V
IN+
IN-
-5V
VS+
OUT
VS-
0.1µF
375Ω
VIN
375Ω
VOUT
5Ω
FIGURE 24. INVERTING 200mA OUTPUT CURRENT
DISTRIBUTION AMPLIFIER
11
FN7389.8
October 29, 2007
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