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.
2002 Elantec Semiconductor, Inc.
E
L
5197C,
E
L
5197AC
General Description
The EL5197C and EL5197AC are fixed gain amplifiers with a band-
width of 200MHz, making these amplifiers ideal for today's high
speed video and monitor applications. These amplifiers feature inter-
nal gain setting resistors and can be configured in a gain of +1, -1 or
+2. The same bandwidth is seen in both gain-of-1 and gain-of-2
applications.
With a supply current of just 4mA and the ability to run from a single
supply voltage from 5V to 10V, these amplifiers are also ideal for
hand held, portable or battery powered equipment.
The EL5197AC also incorporates an enable and disable function to
reduce the supply current to 100A typical per amplifier. Allowing the
CE pin to float or applying a low logic level will enable the amplifier.
The EL5197C is offered in the 5-pin SOT23 package and the
EL5197AC is available in the 6-pin SOT23 as well as the industry-
standard 8-pin SO packages. Both operate over the industrial tempera-
ture range of -40C to +85C.
Pin Configurations
1
2
3
4
8
7
6
5
EL5197ACS
(8-Pin SO)
1
2
3
5
4
EL5197CW
(5-Pin SOT23)
1
2
3
6
4
EL5197ACW
(6-Pin SOT23)
-
+
-
+
NC
IN-
IN+
VS-
CE
VS+
OUT
NC
OUT
VS-
IN+
VS+
IN-
-
+
OUT
VS-
IN+
VS+
IN-
5 CE
Features
Gain selectable (+1, -1, +2)
200MHz -3dB BW (A
V
= 1, 2)
4mA supply current
Fast enable/disable (EL5197AC
only)
Single and dual supply operation,
from 5V to 10V
Available in SOT23 packages
Triple (EL5397C) available
400MHz, 9mA product available
(EL5196C, EL5396C)
Applications
Battery powered equipment
Hand held, portable devices
Video amplifiers
Cable drivers
RGB amplifiers
Test equipment
Instrumentation
Current to voltage converters
Ordering Information
Part No
Package
Tape &
Reel
Outline #
EL5197CW-T7
5-Pin SOT23
7"
MDP0038
EL5197CW-T13
5-Pin SOT23
13"
MDP0038
EL5197ACW-T7
6-Pin SOT23
7"
MDP0038
EL5197ACW-T13
6-Pin SOT23
13"
MDP0038
EL5197ACS
8-Pin SO
-
MDP0027
EL5197ACS-T7
8-Pin SO
7"
MDP0027
EL5197ACS-T13
8-Pin SO
13"
MDP0027
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
F
e
b
r
u
a
r
y
11,
2002
2
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Absolute Maximum Ratings
(T
A
= 25C)
Values beyond absolute maximum ratings can cause the device to be pre-
maturely damaged. Absolute maximum ratings are stress ratings only and
functional device operation is not implied.
Supply Voltage between V
S
+ and V
S
-
11V
Maximum Continuous Output Current
50mA
Operating Junction Temperature
125C
Power Dissipation
See Curves
Pin Voltages
V
S
- - 0.5V to V
S
+ +0.5V
Storage Temperature
-65C to +150C
Operating Temperature
-40C to +85C
Important Note:
All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the
specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
.
Electrical Characteristics
V
S
+ = +5V, V
S
- = -5V, R
L
= 150
, T
A
= 25C unless otherwise specified.
Parameter
Description
Conditions
Min
Typ
Max
Unit
AC Performance
BW
-3dB Bandwidth
A
V
= +1
200
MHz
A
V
= -1
200
MHz
A
V
= +2
200
MHz
BW1
0.1dB Bandwidth
20
MHz
SR
Slew Rate
V
O
= -2.5V to +2.5V, A
V
= +2
1800
2200
V/ s
t
S
0.1% Settling Time
V
OUT
= -2.5V to +2.5V, A
V
= -1
12
ns
e
N
Input Voltage Noise
4.4
nV/
Hz
i
N
-
IN- Input Current Noise
17
pA/
Hz
i
N
+
IN+ Input Current Noise
50
pA/
Hz
dG
Differential Gain Error
[1]
A
V
= +2
0.03
%
dP
Differential Phase Error
[1]
A
V
= +2
0.04
DC Performance
V
OS
Offset Voltage
-10
1
10
mV
T
C
V
OS
Input Offset Voltage Temperature Coefficient
Measured from T
MIN
to T
MAX
5
V/C
A
E
Gain Error
V
O
= -3V to +3V
-2
1.3
2
%
R
F
, R
G
Internal R
F
and R
G
320
400
480
Input Characteristics
CMIR
Common Mode Input Range
3V
3.3V
V
+I
IN
+ Input Current
-60
1
60
A
-I
IN
- Input Current
-30
1
30
A
R
IN
Input Resistance
at I
N
+
45
k
C
IN
Input Capacitance
0.5
pF
Output Characteristics
V
O
Output Voltage Swing
R
L
= 150
to GND
3.4V
3.7V
V
R
L
= 1k
to GND
3.8V
4.0V
V
I
OUT
Output Current
R
L
= 10
to GND
95
120
mA
Supply
I
SON
Supply Current - Enabled
No load, V
IN
= 0V
3
4
5
mA
I
SOFF
Supply Current - Disabled
No load, V
IN
= 0V
100
150
A
PSRR
Power Supply Rejection Ratio
DC, V
S
= 4.75V to 5.25V
55
75
dB
-IPSR
- Input Current Power Supply Rejection
DC, V
S
= 4.75V to 5.25V
-2
2
A/V
3
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Enable (EL5197AC only)
t
EN
Enable Time
40
ns
t
DIS
Disable Time
600
ns
I
IHCE
CE Pin Input High Current
CE = V
S
+
0.8
6
A
I
ILCE
CE Pin Input Low Current
CE = V
S
-
0
-0.1
A
V
IHCE
CE Input High Voltage for Power-down
V
S
+ - 1
V
V
ILCE
CE Input Low Voltage for Power-down
V
S
+ - 3
V
1. Standard NTSC test, AC signal amplitude = 286mV
P-P
, f = 3.58MHz
Electrical Characteristics
V
S
+ = +5V, V
S
- = -5V, R
L
= 150
, T
A
= 25C unless otherwise specified.
Parameter
Description
Conditions
Min
Typ
Max
Unit
4
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Typical Performance Curves
Frequency Response (Gain)
1M
10M
100M
1G
6
2
-2
-6
-14
Frequency (Hz)
N
o
r
m
al
i
z
ed
M
a
g
n
i
t
u
d
e
(
d
B
)
A
V
=2
A
V
=1
A
V
=-1
R
L
=150
Frequency Response (Phase), All Gains
1M
10M
100M
1G
Frequency (Hz)
P
h
ase (
)
R
L
=150
90
0
-90
-180
-270
-360
-10
Frequency Response for Various C
L
1M
10M
100M
1G
14
10
6
2
-6
Frequency (Hz)
N
o
r
m
al
i
z
ed
M
a
g
n
i
t
u
d
e (
d
B
)
A
V
=2
R
L
=150
22pF added
10pF added
0pF added
Group Delay vs Frequency
1M
10M
100M
1G
3.5
3
2
1
0
Frequency (Hz)
D
e
l
ay (
n
s)
A
V
=2
A
V
=1
R
L
=150
Frequency Response for Various Common-Mode Input
Voltages
1M
10M
100M
1G
6
-2
-6
-10
-14
Frequency (Hz)
N
o
r
m
al
i
z
ed
M
a
g
n
i
t
u
d
e
(
d
B
)
A
V
=2
R
L
=150
3V
0V
-3V
2.5
1.5
0.5
-2
2
Transimpedance (ROL) vs Frequency
1k
Frequency (Hz)
10k
100k
1M
10M
100M
1G
10M
100
1k
10k
100k
1M
Ma
g
n
i
t
ud
e
(
)
-90
-180
-270
-360
0
P
h
ase (
)
Phase
Gain
5
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Typical Performance Curves
PSRR and CMRR vs Frequency
P
S
RR
/
C
M
R
R (
d
B
)
Frequency (Hz)
20
-80
-60
-40
-20
0
10k
100k
1M
10M
1G
100M
-3dB Bandwidth vs Supply Voltage
5
6
8
10
250
200
150
100
Total Supply Voltage (V)
-
3
d
B
B
a
nd
w
i
dt
h
(
M
H
z
)
A
V
=2
Peaking vs Supply Voltage
5
4
3
2
0
Total Supply Voltage (V)
P
eaki
n
g
(
d
B
)
A
V
=2
A
V
=-1
A
V
=1
R
L
=150
7
9
A
V
=-1
A
V
=1
5
6
8
10
7
9
1
-3dB Bandwidth vs Temperature
-40
10
60
160
300
250
200
100
0
Ambient Temperature (C)
-
3
dB
B
a
nd
w
i
dt
h
(
M
H
z
)
Peaking vs Temperature
1
0.8
0.4
0.2
0
Ambient Temperature (C)
P
eaki
n
g
(
d
B
)
R
L
=150
110
150
50
0.6
-40
10
60
160
110
Voltage and Current Noise vs Frequency
100
Frequency (Hz)
1k
10k
100k
10M
1M
i
n
+
i
n
-
e
n
V
o
l
t
ag
e N
o
i
s
e (
n
V
/
Hz
)
C
u
rre
n
t
No
i
s
e
(p
A
/
Hz
)
1k
1
10
100
PSRR+
PSRR-
CMRR
R
L
=150
R
L
=150
6
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Typical Performance Curves
Closed Loop Output Impedance vs Frequency
Frequency (Hz)
O
u
t
p
ut
I
m
pe
da
n
c
e
(
)
100
0.001
0.1
10
0.01
1
Su
p
p
l
y
Cu
r
r
e
n
t (
m
A
)
10
0
8
6
0
Supply Voltage (V)
Supply Current vs Supply Voltage
12
2
10
8
6
4
2
4
100
10k
100M
1G
1M
10
Frequency (MHz)
100
In
p
u
t
P
o
w
e
r
In
te
r
c
e
p
t (
d
Bm
)
25
-10
15
20
-5
0
5
10
A
V
=+2
R
L
=150
Two-Tone 3rd Order
Input Referred Intermodulation Intercept (IIP3)
A
V
=+2
R
L
=100
2nd and 3rd Harmonic Distortion vs Frequency
1
Frequency (MHz)
10
100
Ha
r
m
o
n
i
c
Di
s
t
o
r
t
i
o
n
(
d
B
c
)
-20
-80
-40
-60
-90
-50
-70
A
V
=+2
V
OUT
=2V
P-P
R
L
=100
2nd Order
Distortion
-30
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-0.05
dG
(
%
)
or
dP
(
)
-1
-0.5
0
0.5
1
dP
dG
A
V
=2
R
F
=R
G
=500
R
L
=150
0.04
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
dG
(
%
)
or
dP
(
)
-1
-0.5
0
0.5
1
dP
dG
A
V
=1
R
F
=750
R
L
=500
Differential Gain/Phase vs DC Input
Voltage at 3.58MHz
DC Input Voltage (V)
Differential Gain/Phase vs DC Input
Voltage at 3.58MHz
DC Input Voltage (V)
3rd Order
Distortion
7
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Typical Performance Curves
1
Frequency (MHz)
10
100
O
u
t
p
u
t
V
o
l
t
ag
e S
w
i
n
g
(
V
PP
)
10
0
2
4
6
8
Output Voltage Swing vs Frequency
THD<0.1%
Output Voltage Swing vs Frequency
THD<1%
1
Frequency (MHz)
10
100
O
u
t
p
u
t
V
o
l
t
ag
e S
w
i
n
g
(
V
PP
)
10
0
2
4
6
8
A
V
=2
Large Signal Step Response
1V/div
10ns/div
V
S
=5V
R
L
=150
A
V
=2
Small Signal Step Response
Settling Time vs Settling Accuracy
25
20
15
10
0
S
e
t
t
l
in
g Ti
me
(
n
s
)
0.01
0.1
1
Settling Accuracy (%)
5
A
V
=2
R
L
=150
V
STEP
=5V
P-P
output
200mV/div
10ns/div
V
S
=5V
R
L
=150
A
V
=2
Transimpedance (RoI) vs Temperature
625
600
575
550
525
-40
10
60
110
160
Die Temperature (C)
Ro
I
(k
)
R
L
=500
R
L
=150
A
V
=2
R
L
=500
R
L
=150
8
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Typical Performance Curves
Frequency Response (Gain)
SO8 Package
1M
10M
100M
1G
Frequency (Hz)
N
o
r
m
al
i
z
ed
M
a
g
n
i
t
u
d
e
(
d
B
)
6
-2
-6
-10
-14
A
V
=1
R
L
=150
Frequency Response (Phase)
SO8 Package
1M
10M
100M
1G
Frequency (Hz)
P
h
ase (
)
A
V
=2
A
V
=-1
R
L
=150
2
90
-90
-180
-270
-360
0
ICMR and IPSR vs Temperature
2
1.5
0.5
0
-0.5
-40
10
60
110
160
Die Temperature (C)
ICM
R
/IPSR
(
A/V)
1
PSRR and CMRR vs Temperature
90
70
50
40
30
20
10
-40
10
60
110
160
Die Temperature (C)
PSR
R
/
CM
R
R
(
d
B)
60
Offset Voltage vs Temperature
2
1
0
-1
-2
-40
10
60
110
160
Die Temperature (C)
V
OS
(mV
)
80
PSRR
ICMR+
IPSR
ICMR-
Input Current vs Temperature
60
40
20
-20
-40
-60
-40
10
110
160
Die Temperature (C)
In
p
u
t Cu
r
r
e
n
t (
A)
0
60
IB-
IB+
CMRR
9
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Typical Performance Curves
Negative Output Swing vs Temperature for Various Loads
-3.5
-3.6
-3.7
-3.9
-4
-4.1
-4.2
-40
10
110
160
Die Temperature (C)
V
OUT
(V
)
-3.8
60
Positive Output Swing vs Temperature for Various Loads
4.2
4.1
4
3.8
3.7
3.6
3.5
-40
10
110
160
Die Temperature (C)
V
OU
T
(V
)
3.9
60
Positive Input Resistance vs Temperature
60
50
30
20
10
0
-40
10
110
160
Die Temperature (C)
R
IN
+ (
k
)
40
60
Supply Current vs Temperature
5
3
2
1
0
-40
10
110
160
Die Temperature (C)
Su
p
p
l
y
Cu
r
r
e
n
t
(
m
A)
4
60
1k
150
1k
150
Output Current vs Temperature
130
125
120
115
-40
10
60
110
160
Die Temperature (C)
I
OUT
(mA
)
Sink
Source
Slew Rate vs Temperature
4000
3500
3000
2500
-40
10
60
110
160
Die Temperature (C)
S
l
e
w
R
a
te
(
V
/S)
A
V
=2
R
F
=R
G
=500
R
L
=150
10
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Typical Performance Curves
Package Power Dissipation vs Ambient Temperature
JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board
0.7
0.6
0.5
0.3
0.2
0.1
0
0
50
100
150
Ambient Temperature (C)
P
o
w
e
r
D
i
ss
i
p
at
i
o
n
(
W
)
0.4
25
75
125
625mW
391mW
SOT
23
256
C/W
SO8
160
C/W
85
Enable Response
Disable Response
20ns/div
500mV/div
5V/div
400ns/div
500mV/div
5V/div
11
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Pin Descriptions
EL5197AC
8-Pin SO
EL5197C
5-Pin SOT23
EL5197AC
6-Pin SOT23
Pin Name
Function
Equivalent Circuit
1, 5
NC
Not connected
2
4
4
IN-
Inverting input
Circuit 1
3
3
3
IN+
Non-inverting input
(See circuit 1)
4
2
2
VS-
Negative supply
6
1
1
OUT
Output
Circuit 2
7
5
6
VS+
Positive supply
8
5
CE
Chip enable
Circuit 3
R
G
R
F
IN-
IN+
R
F
OUT
V
S
+
V
S
-
CE
12
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Applications Information
Product Description
The EL5197C is a current-feedback operational ampli-
fier that offers a wide -3dB bandwidth of 300MHz and a
low supply current of 4mA per amplifier. The EL5197C
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 EL5197C 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
EL5197C 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 EL5192C
with 600MHz on a 6mA 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 4.7 F tantalum capacitor in parallel with a
0.01 F 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.
Disable/Power-Down
The EL5197AC amplifier can be disabled placing its
output in a high impedance state. When disabled, the
amplifier supply current is reduced to < 150 A. The
EL5197AC is disabled when its CE pin is pulled up to
within 1V of the positive supply. Similarly, the amplifier
is enabled by floating or pulling its CE pin to at least 3V
below the positive supply. For 5V supply, this means
that an EL5197AC amplifier will be enabled when CE is
2V or less, and disabled when CE is above 4V. Although
the logic levels are not standard TTL, this choice of
logic voltages allows the EL5197AC to be enabled by
tying CE to ground, even in 5V single supply applica-
tions. The CE pin can be driven from CMOS outputs.
Capacitance at the Inverting Input
Any manufacturer's 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 p ole frequ ency (in creasing th e po ssibility of
oscillation.)
The EL5197C has been optimized with a 475
feedback
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.
13
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Feedback Resistor Values
The EL5197C has been designed and specified at a gain
of +2 with R
F
approximately 500
. This value of feed-
back resistor gives 200MHz of -3dB bandwidth at A
V
=2
with 2dB of peaking. With A
V
=-2, an R
F
of approxi-
mately 500
gives 175MHz of bandwidth with 0.2dB of
peaking. Since the EL5197C is a current-feedback
amplifier, it is also possible to change the value of R
F
to
get more bandwidth. As seen in the curve of Frequency
Response for Various R
F
and R
G
, bandwidth and peak-
ing can be easily modified by varying the value of the
feedback resistor.
Because the EL5197C is a current-feedback amplifier,
its gain-bandwidth product is not a constant for different
closed-loop gains. This feature actually allows the
EL5197C to maintain about the same -3dB bandwidth.
As gain is increased, bandwidth decreases slightly while
stability increases. Since the loop stability is improving
with higher closed-loop gains, it becomes possible to
reduce the value of R
F
below the specified 475
and
still retain stability, resulting in only a slight loss of
bandwidth with increased closed-loop gain.
Supply Voltage Range and Single-Supply
Operation
The EL5197C has been designed to operate with supply
voltages having a span of greater than 5V and less than
10V. In practical terms, this means that the EL5197C
will operate on dual supplies ranging from 2.5V to
5V. With single-supply, the EL5197C will operate
from 5V to 10V.
As supply voltages continue to decrease, it becomes nec-
essary to provide input and output voltage ranges that
can get as close as possible to the supply voltages. The
EL5197C has an input range which extends to within 2V
of either supply. So, for example, on +5V supplies, the
EL5197C has an input range which spans 3V. The out-
put range of the EL5197C is also quite large, extending
to within 1V of the supply rail. On a 5V supply, the
output is therefore capable of swinging from
----
-4V to
+4V. Single-supply output range is larger because of the
increased negative swing due to the external pull-down
resistor to ground.
Video Performance
For good video performance, an amplifier is required to
maintain the same output impedance and the same fre-
quency 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 EL5197C
amplifier. Special circuitry has been incorporated in the
EL5197C to reduce the variation of output impedance
with current output. This results in dG and dP specifica-
tions 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
EL5197C has dG and dP specifications of 0.03% and
0.04.
Output Drive Capability
In spite of its low 4mA of supply current, the EL5197C
is capable of providing a minimum of 120mA of output
current. With a minimum of 120mA of output drive,
the EL5197C is capable of driving 50
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 resis-
tor will decouple the EL5197C from the cable and allow
extensive capacitive drive. However, other applications
may have high capacitive loads without a back-termina-
tion 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. The gain
resistor (R
G
) 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 (R
F
) to reduce
the peaking.
14
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
Current Limiting
The EL5197C has no internal current-limiting circuitry.
If the output is shorted, it is possible to exceed the Abso-
lute 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 EL5197C, it
is possible to exceed the 125C Absolute Maximum
junction temperature under certain very high load cur-
rent 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 EL5197C to
remain in the safe operating area. These parameters are
calculated as follows:
where:
T
MAX
= Maximum ambient temperature
JA
= Thermal resistance of the package
n = Number of amplifiers in the package
PD
MAX
= Maximum power dissipation of each ampli-
fier 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
T
J M A X
T
M A X
J A
n
PD
M A X
(
)
+
=
PD
M A X
2
(
V
S
I
SM A X
)
V
S
(
V
O U T M A X
)
V
O U T M A X
R
L
----------------------------
+
=
15
EL5197C, EL5197AC
Single 200MHz Fixed Gain Amplifier with Enable
E
L
5197C,
E
L
5197AC
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the cir-
cuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described
herein and makes no representations that they are free from patent infringement.
WARNING - Life Support Policy
Elantec, Inc. products are not authorized for and should not be used
within Life Support Systems without the specific written consent of
Elantec, Inc. Life Support systems are equipment intended to sup-
port or sustain life and whose failure to perform when properly used
in accordance with instructions provided can be reasonably
expected to result in significant personal injury or death. Users con-
templating application of Elantec, Inc. Products in Life Support
Systems are requested to contact Elantec, Inc. factory headquarters
to establish suitable terms & conditions for these applications. Elan-
tec, Inc.'s warrant y is limited to replacement of defective
components and does not cover injury to persons or property or
other consequential damages.
F
e
b
r
u
a
r
y
11,
2002
Printed in U.S.A.
Elantec Semiconductor, Inc.
675 Trade Zone Blvd.
Milpitas, CA 95035
Telephone: (408) 945-1323
(888) ELANTEC
Fax:
(408) 945-9305
European Office: +44-118-977-6020
Japan Technical Center: +81-45-682-5820
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