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EL5292CS Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL5292CS
Beschreibung Dual 600MHz Current Feedback Amplifier
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 15 Seiten
EL5292CS Datasheet, Funktion
EL5292C
Dual 600MHz Current Feedback Amplifier
Features
600MHz -3dB bandwidth
6mA supply current (per amplifier)
Single and dual supply operation,
from 5V to 10V
Single (EL5192C) and triple
(EL5392C) available
High speed, 1GHz product
available (EL5191C)
Low power, 4mA, 300MHz
product available (EL5193C,
EL5293C, and EL5393C
Applications
Video Amplifiers
Cable Drivers
RGB Amplifiers
Test Equipment
Instrumentation
Current to Voltage Converters
Ordering Information
Part No
EL5292CS
EL5292CS-T7
EL5292CS-T13
Package
8-Pin SO
8-Pin SO
8-Pin SO
Tape &
Reel
-
7
13
Outline #
MDP0027
MDP0027
MDP0027
General Description
The EL5292C is a dual current feedback amplifier with a very high
bandwidth of 600MHz. This makes this amplifier ideal for todays
high speed video and monitor applications.
With a supply current of just 6mA per amplifier and the ability to run
from a single supply voltage from 5V to 10V, the EL5292C is also
ideal for hand held, portable or battery powered equipment.
The EL5292C is offered in the industry standard 8-pin SO. The
EL5292C operates over the industrial temperature range of -40°C to
+85°C.
Pin Configurations
OUTA 1
INA- 2
INA+ 3
VS- 4
8-Pin SO
-
+
-
+
EL5292CS
8 VS+
7 OUTB
6 INB-
5 INB+
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.






EL5292CS Datasheet, Funktion
EL5292C
Dual 600MHz Current Feedback Amplifier
Typical Performance Curves
Peaking vs Temperature
2
RL=150
1.5
AV=1
1
AV=-1
0.5
AV=-2
0
AV=2
-0.5
-50
-50
0
50
Ambient Temperature (°C)
Closed Loop Output Impedance vs Frequency
100
100
10
1
0.1
0.01
0.001
100 1k 10k 100k 1M 10M 100M 1G
Frequency (Hz)
2nd and 3rd Harmonic Distortion vs Frequency
-20
-30
AV=+2
VOUT=2VP-P
-40 RL=100
-50 2nd Order
-60 Distortion
-70
-80 3rd Order
-90 Distortion
-100
1
10
Frequency (MHz)
100
Voltage and Current Noise vs Frequency
1000
100 in+
in-
10
en
1
100 1000 10k 100k
Frequency ()
Supply Current vs Supply Voltage
10
1M
10M
8
6
4
2
0
0 2 4 6 8 10 12
Supply Voltage (V)
Two-tone 3rd Order
Input Referred Intermodulation Intercept (IIP3)
30
25 AV=+2
20 RL=150
15
10
5
0
-5 AV=+2
-10 RL=100
-15
10
Frequency (MHz)
100
200
6

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EL5292CS pdf, datenblatt
EL5292C
Dual 600MHz Current Feedback Amplifier
Applications Information
Product Description
The EL5292C is a current-feedback operational ampli-
fier that offers a wide -3dB bandwidth of 600MHz and a
low supply current of 6mA per amplifier. The EL5292C
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 EL5292C 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
EL5292C the ideal choice for many low-power/high-
bandwidth applications such as portable, handheld, or
battery-powered equipment.
For varying bandwidth needs, consider the EL5191C
with 1GHz on a 9mA 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 EL5292C has been optimized with a 375feedback
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 EL5292C has been designed and specified at a gain
of +2 with RF approximately 375. This value of feed-
back resistor gives 300MHz of -3dB bandwidth at AV=2
with 2dB of peaking. With AV=-2, an RF of 375gives
275MHz of bandwidth with 1dB of peaking. Since the
EL5292C is a current-feedback amplifier, it is also pos-
sible to change the value of RF to get more bandwidth.
As seen in the curve of Frequency Response for Various
RF and RG, bandwidth and peaking can be easily modi-
fied by varying the value of the feedback resistor.
Because the EL5292C is a current-feedback amplifier,
its gain-bandwidth product is not a constant for different
closed-loop gains. This feature actually allows the
EL5292C to maintain about the same -3dB bandwidth.
As gain is increased, bandwidth decreases slightly while
stability increases. Since the loop stability is improving
12

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