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EL5191CS-T7 Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL5191CS-T7
Beschreibung 1GHz Current Feedback Amplifier
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 17 Seiten
EL5191CS-T7 Datasheet, Funktion
EL5191C
1GHz Current Feedback Amplifier
Features
1GHz -3dB bandwidth
9mA supply current
Single and dual supply operation,
from 5V to 10V supply span
Available in 5-pin SOT23 package
High speed, 600MHz product
available (EL5192C, EL5292C,
and EL5392C)
Lower power, 300MHz product
available (EL5193C, EL5293C,
EL5393C)
Applications
Video Amplifiers
Cable Drivers
RGB Amplifiers
Test Equipment
Instrumentation
Current to Voltage Converters
Ordering Information
Part No
EL5191CW-T7
EL5191CW-T13
EL5191CS
EL5191CS-T7
EL5191CS-T13
Package
5-Pin SOT23
5-Pin SOT23
8-Pin SO
8-Pin SO
8-Pin SO
Tape &
Reel
7
13
-
7
13
Outline #
MDP0038
MDP0038
MDP0027
MDP0027
MDP0027
General Description
The EL5191C amplifier is of the current feedback variety and exhibits
a very high bandwidth of 1GHz. This makes this amplifier ideal for
todays high speed video and monitor applications, as well as a num-
ber of RF and IF frequency designs.
With a supply current of just 9mA and the ability to run from a single
supply voltage from 5V to 10V, these amplifiers offer very high per-
formance for little power consumption.
For applications where board space is critical, the EL5191C is offered
in the 5-pin SOT23 package, as well as an industry standard 8-pin SO.
The EL5191C operates over the industrial temperature range of -40°C
to +85°C.
Pin Configurations
5-Pin SOT23
OUT 1
5 VS+
VS- 2
IN+ 3
EL5191CW
4 IN-
NC 1
IN- 2
IN+ 3
VS- 4
8-Pin SO
-
+
EL5191CS
8 NC*
7 VS+
6 OUT
5 NC
* This pin must be left disconnected
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.






EL5191CS-T7 Datasheet, Funktion
EL5191C
1GHz Current Feedback Amplifier
Typical Performance Curves
Inverting Frequency Response (Gain)
SO8 Package
6
AV=-1
2
AV=-2
-2
AV=-5
-6
-10 RF=250
RL=150
-14
1M
10M 100M
Frequency (Hz)
1G
-3dB Bandwidth vs Temperature for Non-inverting
Gains
2000
RF=250
RL=150
1500
AV=1
1000
AV=2
500
AV=5
AV=10
0
-40 10
60 110 160
Ambient Temperature (°C)
Peaking vs Temperature
3
2.5
2 AV=1
RL=150
1.5
1 AV=-1
0.5
0
-40
AV=-2
10 60 110
Ambient Temperature (°C)
160
Inverting Frequency Response (Phase)
SO8 Package
90
AV=-1
AV=-2
0
-90
AV=-5
-180
-270 RF=250
RL=150
-360
1M
10M 100M
Frequency (Hz)
1G
-3dB Bandwidth vs Temperature for Inverting
Gains
700
600 AV=-1
500
AV=-2
400
300 AV=-5
200
100 RF=250
RL=150
0
-40
10
60 110
Ambient Temperature (°C)
160
Voltage and Current Noise vs Frequency
1000
100 in+
in-
10
en
1
100 1000 10k 100k 1M 10M
Frequency ()
6

6 Page









EL5191CS-T7 pdf, datenblatt
EL5191C
1GHz Current Feedback Amplifier
Applications Information
Product Description
The EL5191C is a current-feedback operational ampli-
fier that offers a wide -3dB bandwidth of 1GHz and a
low supply current of 9mA per amplifier. The EL5191C
works with supply voltages ranging from a single 5V to
10V and they are also capable of swinging to within 1V
of either supply on the output. Because of their current-
feedback topology, the EL5191C does not have the nor-
mal gain-bandwidth product associated with voltage-
feedback operational amplifiers. Instead, its -3dB band-
width to remain relatively constant as closed-loop gain is
increased. This combination of high bandwidth and low
power, together with aggressive pricing make the
EL5191C the ideal choice for many low-power/high-
bandwidth applications such as portable, handheld, or
battery-powered equipment.
For varying bandwidth needs, consider the EL5192C
with 600MHz on a 6mA supply current or the EL5193C
with 300MHz on a 4mA supply current. Versions
include single, dual, and triple amp packages with 5-pin
SOT23, 16-pin QSOP, and 8-pin or 16-pin SO outlines.
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high frequency device, good printed circuit
board layout is necessary for optimum performance.
Low impedance ground plane construction is essential.
Surface mount components are recommended, but if
leaded components are used, lead lengths should be as
short as possible. The power supply pins must be well
bypassed to reduce the risk of oscillation. The combina-
tion of a 4.7µF tantalum capacitor in parallel with a
0.01µF capacitor has been shown to work well when
placed at each supply pin.
For good AC performance, parasitic capacitance should
be kept to a minimum, especially at the inverting input.
(See the Capacitance at the Inverting Input section) Even
when ground plane construction is used, it should be
removed from the area near the inverting input to mini-
mize any stray capacitance at that node. Carbon or
Metal-Film resistors are acceptable with the Metal-Film
resistors giving slightly less peaking and bandwidth
because of additional series inductance. Use of sockets,
particularly for the SO package, should be avoided if
possible. Sockets add parasitic inductance and capaci-
tance which will result in additional peaking and
overshoot.
Capacitance at the Inverting Input
Any manufacturers high-speed voltage- or current-
feedback amplifier can be affected by stray capacitance
at the inverting input. For inverting gains, this parasitic
capacitance has little effect because the inverting input is
a virtual ground. But for non-inverting gains, this capac-
itance (in conjunction with the feedback and gain
resistors) creates a pole in the feedback path of the
amplifier. This pole, if low enough in frequency, has the
same destabilizing effect as a zero in the forward open-
loop response. The use of large value feedback and gain
resistors exacerbates the problem by further lowering
the pole frequency (increasing the possibility of
oscillation.)
The EL5191C has been optimized with a 250feedback
resistor. With the high bandwidth of these amplifiers,
these resistor values might cause stability problems
when combined with parasitic capacitance, thus ground
plane is not recommended around the inverting input pin
of the amplifier.
Feedback Resistor Values
The EL5191C has been designed and specified at a gain
of +2 with RF approximately 250. This value of feed-
back resistor gives 600MHz of -3dB bandwidth at AV=2
with about 2dB of peaking. With AV=-2, that same RF
gives 450MHz of bandwidth with 0.6dB of peaking.
Since the EL5191C is a current-feedback amplifier, it is
also possible to change the value of RF to get more band-
width. As seen in the curve of Frequency Response for
Various RF and RG, bandwidth and peaking can be eas-
ily modified by varying the value of the feedback
resistor.
Because the EL5191C is a current-feedback amplifier,
its gain-bandwidth product is not a constant for different
closed-loop gains. This feature actually allows the
EL5191C to maintain about the same -3dB bandwidth.
As gain is increased, bandwidth decreases slightly while
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