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參數(shù)資料
| 型號： | EL5197CW-T7A |
| 廠商： | INTERSIL CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Single 200MHz Fixed Gain Amplifier with Enable |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 275K |
| 代理商： | EL5197CW-T7A |
13
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
external pull-down resistor to ground. Figure 4 shows an AC-
coupled, gain of +2, +5V single supply circuit configuration.
Video Performance
For good video performance, an amplifier is required to
maintain the same output impedance and the same
frequency response as DC levels are changed at the output.
This is especially difficult when driving a standard video load
of 150
, because of the change in output current with DC
level. Previously, good differential gain could only be
achieved by running high idle currents through the output
transistors (to reduce variations in output impedance.)
These currents were typically comparable to the entire 4mA
supply current of each EL5197 amplifier. Special circuitry
has been incorporated in the EL5197 to reduce the variation
of output impedance with current output. This results in dG
and dP specifications of 0.03% and 0.04°, while driving
150
at a gain of 2.
Video performance has also been measured with a 500
load at a gain of +1. Under these conditions, the EL5197 has
dG and dP specifications of 0.03% and 0.04°, respectively.
Output Drive Capability
In spite of its low 4mA of supply current, the EL5197 is
capable of providing a minimum of ±95mA of output current
with a minimum of ±95mA of output drive.
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 EL5197 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 5
and
50
) can be placed in series with the output to eliminate
most peaking.
Current Limiting
The EL5197 has 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 EL5197, it is
possible to exceed the 125°C Absolute Maximum junction
temperature under certain very high load current conditions.
Generally speaking when R
L
falls below about 25
, it is
important to calculate the maximum junction temperature
(T
JMAX
) for the application to determine if power supply
voltages, load conditions, or package type need to be
modified for the EL5197 to remain in the safe operating area.
These parameters are calculated as follows:
where:
T
MAX
= Maximum ambient temperature
θ
JA
= Thermal resistance of the package
n = Number of amplifiers in the package
PD
MAX
= Maximum power dissipation of each amplifier in
the package
PD
MAX
for each amplifier can be calculated as follows:
where:
V
S
= Supply voltage
I
SMAX
= Maximum supply current of 1A
V
OUTMAX
= Maximum output voltage (required)
R
L
= Load resistance
FIGURE 4.
-
+
400
400
V
IN
+5
0.1μF
1k
1k
0.1μF
+5
V
OUT
T
JMAX
T
MAX
θ
JA
n
PD
MAX
×
×
(
)
+
=
PD
MAX
2
(
V
S
I
SMAX
)
V
S
(
- V
OUTMAX
)
V
L
----------------------------
×
+
×
×
=
EL5197, EL5197A
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