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PDF EL8108 Data sheet ( Hoja de datos )
| Número de pieza | EL8108 | |
| Descripción | Video Distribution Amplifier | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de EL8108 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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c1No-8nO8ta8DRc-EaItNtCOoaTOuBESrMSRhTMOSeeILecELhEtNonTDriEcEwaDPlwRSRwOuE.DipPnpULteoCArrTsCt iCEl.ceMonEmteN/rJTtsaactnuary 29, 2008
EL8108
FN7417.2
Video Distribution Amplifier
The EL8108 is a dual current feedback operational amplifier
designed for video distribution solutions. This device
features a high drive capability of 450mA while consuming
only 5mA of supply current per amplifier and operating from
a single 5V to 12V supply.
The EL8108 is available in the industry standard 8 Ld SOIC
as well as the thermally-enhanced 16 Ld QFN package. Both
are specified for operation over the full -40°C to +85°C
temperature range. The EL8108 has control pins C0 and C1
for controlling the bias and enable/disable of the outputs.
The EL8108 is ideal for driving multiple video loads while
maintaining linearity.
Pinouts
EL8108
(8 LD SOIC)
TOP VIEW
OUTA 1
8 VS
INA- 2
-
7 OUTB
+
INA+ 3
6 INB-
-
GND 4
+ 5 INB+
EL8108
(16 LD QFN)
TOP VIEW
NC 1
INA- 2
INA+ 3
GND 4
AMP A
-
+
AMP B
-
+
POWER
CONTROL
LOGIC
12 NC
11 INB-
10 INB+
9 C1
Features
• Drives up to 450mA from a +12V supply
• 20VP-P differential output drive into 100
• -85dBc typical driver output distortion at full output at
150kHz
• -70dBc typical driver output distortion at 3.75MHz
• Low quiescent current of 5mA per amplifier
• 300MHz bandwidth
• Pb-free available (RoHS compliant)
Applications
• Video distribution amplifiers
150
1
1
2
2
3
3
2
3
4
5
6
TABLE 1.
150
DIFF GAIN
0 0.03
1 0.03
1 0.05
2 0.06
2 0.08
3 0.11
0 0.04
0 0.05
0 0.07
0 0.08
0 0.10
DIFF PHASE
0.01
0.01
0.02
0.03
0.03
0.03
0.01
0.02
0.02
0.03
0.03
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas LLC.
Copyright Intersil Americas LLC. 2007, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
EL8108
Typical Performance Curves (Continued)
14
VS = ±6V
AV = 2
12 RL = 100 DIFF
10
8
6
4
2
0
-2
RF = 248
RF = 500
RF = 1k
RF = 750
100k
1M 10M
FREQUENCY (Hz)
100M
500M
FIGURE 7. DIFFERENTIAL FREQUENCY RESPONSE WITH
VARIOUS RF
8
VS = ±6V
AV = 2
6 RF = 500
4
2
0
-2
-4
-6
-8
RL = 150
RL = 25
RL = 50
100k
1M 10M
FREQUENCY (Hz)
100M
500M
FIGURE 8. FREQUENCY RESPONSE FOR VARIOUS RLOAD
-50
VS = ±6V
-55 AV = 5
RL = 50 DIFF
-60 RF = 750
EL8108IL
EL8108IS
-65
-70 3rd HD
-75
-80
2nd HD
-85 1 2 3 4 5 6 7 8 9
VOP-P (V)
FIGURE 9. DISTORTION BETWEEN EL8108IL vs EL8108IS
AT 2MHz
-50
VS = ±6V
-55
AV = 5
RL = 50 DIFF
RF = 750
-60
EL8108IL
EL8108IS
-65 3rd HD
-70
-75
2nd HD
-80 1 2 3 4 5 6 7 8 9
VOP-P (V)
FIGURE 10. DISTORTION BETWEEN EL8108IL vs EL8108IS
AT 3MHz
-40
VS = ±6V
-45 AV = 5
RL = 50 DIFF
-50 RF = 750
-55
3rd HD
EL8108IL
EL8108IS
-60
-65
-70 2nd HD
-75 1 2 3 4 5 6 7 8 9
VOP-P (V)
FIGURE 11. DISTORTION BETWEEN EL8108IL vs EL8108IS
AT 5MHz
5
-40
VS = ±6V
AV = 5
-45 RL = 50 DIFF
RF = 750
-50
3rd HD
EL8108IL
EL8108IS
-55
2nd HD
-60
-65 1 2 3 4 5 6 7 8 9
VOP-P (V)
FIGURE 12. DISTORTION BETWEEN EL8108IL vs EL8108IS
AT 10MHz
FN7417.2
January 29, 2008
5 Page 
EL8108
Capacitance at the Inverting Input
Due to the topology of the current feedback amplifier, stray
capacitance at the inverting input will affect the AC and
transient performance of the EL8108 when operating in the
non-inverting configuration.
In the inverting gain mode, added capacitance at the
inverting input has little effect since this point is at a virtual
ground and stray capacitance is therefore not “seen” by the
amplifier.
Feedback Resistor Values
The EL8108 has been designed and specified with
RF = 500 for AV = +2. This value of feedback resistor yields
extremely flat frequency response with little to no peaking
out to 200MHz. As is the case with all current feedback
amplifiers, wider bandwidth, at the expense of slight
peaking, can be obtained by reducing the value of the
feedback resistor. Inversely, larger values of feedback
resistor will cause rolloff to occur at a lower frequency. See
“Typical Performance Curves” beginning on page 4, which
show 3dB bandwidth and peaking vs frequency for various
feedback resistors and various supply voltages.
Bandwidth vs Temperature
Whereas many amplifier's supply current and consequently
3dB bandwidth drop off at high temperature, the EL8108 was
designed to have little supply current variations with
temperature. An immediate benefit from this is that the 3dB
bandwidth does not drop off drastically with temperature.
Supply Voltage Range
The EL8108 has been designed to operate with supply
voltages from ±2.5V to ±6V. Optimum bandwidth, slew rate,
and video characteristics are obtained at higher supply
voltages. However, at ±2.5V supplies, the 3dB bandwidth at
AV = +5 is a respectable 200MHz.
Single Supply Operation
If a single supply is desired, values from +5V to +12V can be
used as long as the input common mode range is not
exceeded. When using a single supply, be sure to either:
1. DC bias the inputs at an appropriate common mode
voltage and AC couple the signal, or
2. Ensure the driving signal is within the common mode
range of the EL8108.
Driving Cables and Capacitive Loads
The EL8108 was designed with driving multiple coaxial
cables in mind. With 450mA of output drive and low output
impedance, driving six, 75 double terminated coaxial
cables to ±11V with one EL8108 is practical.
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 EL8108 from the capacitive cable and allow
extensive capacitive drive.
Other applications may have high capacitive loads without
termination resistors. In these applications, an additional
small value (5 to 50) resistor in series with the output will
eliminate most peaking.
The following schematic show the EL8108 driving 6 double
terminated cables, each an average length of 50 ft.
11 FN7417.2
January 29, 2008
11 Page | ||
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| PDF Descargar | [ Datasheet EL8108.PDF ] | |
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