Page 1
EL2360C
Triple 130 MHz Current Feedback Amplifier
EL2360C June 1996 Rev A
Features
# Triple amplifier topology
V
V
ea
ea
b
3 dB bandwidth
2)
b
3 dB bandwidth
1)
g
2V to
# 130 MHz
(A
# 180 MHz
(A
# Wide supply range,
g
15V
# 80 mA output current (peak)
# Low cost
# 1500 V/ms slew rate
# Input common mode range to
within 1.5V of supplies
# 35 ns settling time to 0.1%
# Available in single (EL2160C),
dual (EL2260C), and quad
(EL2460C) form
Applications
# RGB amplifiers
# Video amplifiers
# Cable driver
# Test equipment amplifiers
# Current to voltage converters
# Video broadcast equipment
General Description
The EL2360C is a triple current-feedback operational amplifier
which achieves a
a
2. Built using the Elantec proprietary monolithic complementary bipolar process, these amplifiers use current mode
feedback to achieve more bandwidth at a given gain than a
conventional voltage feedback amplifier.
The EL2360C is designed to drive a double terminated 75X coax
cable to video levels. It’s fast slew rate of 1500 V/ms, combined
with the triple amplifier topology, makes its ideal for RGB video applications.
This amplifier can operate on any supply voltage from 4V
g
(
2V) to 33V (g16.5V), yet consume only 8 mA per amplifier
at any supply voltage. The EL2360C is available in 16-pin
PDIP and SOIC packages.
For Single, Dual, or Quad applications, consider the EL2160C,
EL2260C, or EL2460C all in industry standard pin outs. For
Single applications with a power down feature, consider the
EL2166C.
b
3 dB bandwidth of 130 MHz at a gain of
Connection Diagram
EL2360C SOIC, P-DIP
Packages
Ordering Information
Part No. Temp. Range Package Outline
EL2360CNb40§Ctoa85§C16bPin PDIP MDP0031
EL2360CSb40§Ctoa85§C16bPin SOIC MDP0027
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.
©
1996 Elantec, Inc.
Ý
2360– 1
Top View
Page 2
EL2360C
Triple 130 MHz Current Feedback Amplifier
Absolute Maximum Ratings
Voltage between V
Common-Mode Input Voltage V
Differential Input Voltage
Current into
S
a
IN orbIN
a
and V
b
S
e
(T
25§C)
A
a
33V
to V
b
S
g
g
10 mA
Output Current (continuous)
Operating Ambient Temperature Range
a
S
6V
Operating Junction Temperature 150
Storage Temperature Range
g
b
40§Ctoa85§C
b
65§Ctoa150§C
50 mA
§
Internal Power Dissipation See Curves
Important Note:
All parameters having Min/Max specifications are guaranteed. The Test Level column indicates the specific device testing actually
performed during production and Quality inspection. Elantec performs most electrical tests using modern high-speed automatic test
e
equipment, specifically the LTX77 Series system. Unless otherwise noted, all tests are pulsed tests, therefore T
e
T
TA.
J
C
Test Level Test Procedure
I 100% production tested and QA sample tested per QA test plan QCX0002.
II 100% production tested at T
T
and T
III QA sample tested per QA test plan QCX0002.
MAX
per QA test plan QCX0002.
MIN
e
25§C and QA sample tested at T
A
e
25§C,
A
IV Parameter is guaranteed (but not tested) by Design and Characterization Data.
V Parameter is typical value at T
DC Electrical Characteristics
Parameter Description Conditions Min Typ Max
V
OS
TCV
OS
a
I
IN
b
I
IN
CMRR Common Mode Rejection Ratio, (Note 2) V
b
ICMR
Input Offset Voltage V
Average Input Offset Voltage Drift, (Note 1) 10 V mV/§C
a
Input Current V
b
Input Current V
b
Input Current Common V
Mode Rejection, (Note 2)
e
25§C for information purposes only.
A
e
g
V
S
e
15V, R
L
e
g
5V,g15V 2 10 I mV
S
e
g
5V,g15V 0.5 3 I mA
S
e
g
5V,g15V 5 25 I mA
S
e
g
5V,g15V 50 55 I dB
S
e
g
5V,g15V
S
150X,T
e
25§C unless otherwise specified
A
0.2 5 I mA/V
Test
Level
Units
PSRR Power Supply Rejection Ratio, (Note 3) 75 95 I dB
b
R
a
a
IPSR
OL
R
C
IN
IN
b
Input Current Power
Supply Rejection, (Note 3)
e
Transimpedance, (Note 4) V
a
Input Resistance 1.5 3 I MX
a
Input Capacitance PDIP package 1.5 V pF
g
S
e
g
V
S
15V, R
15V, R
e
400X 500 2000 I kX
L
e
150X 500 1800 I kX
L
0.2 5 I mA/V
SOIC package 1 V pF
e
CMIR Common Mode Input Range V
Note 1: Measured from T
e
g
CM
OUT
e
g
10V for V
7V for V
Note 2: V
Note 3: The supplies are moved from
Note 4: V
MIN
to T
.
MAX
e
g
15V, V
S
e
g
15V, V
S
e
CM
g
2.5V tog15V.
e
OUT
g
3V for V
g
2V for V
g
15V
S
e
g
V
5V
S
e
g
5V.
S
e
g
5V.
S
g
13.5 V V
g
3.5 V V
C
TDis 3.4in
2
Page 3
EL2360C
Triple 130 MHz Current Feedback Amplifier
DC Electrical Characteristics
e
g
V
S
15V, R
e
L
150X,T
e
25§C unless otherwise specified Ð Contd.
A
Parameter Description Conditions Min Typ Max
e
V
O
I
SC
I
S
Output Voltage Swing V
Output Short Circuit Current, (Note 5) V
Supply Current (per amplifier) V
g
S
e
g
V
S
e
g
V
S
e
g
S
e
g
S
e
g
V
S
e
15V, R
15V, R
5V, R
400Xg12g13.5 I V
L
e
150X
L
e
150X
L
g
12 V V
g
3.0g3.7 I V
5V,g15V 60 100 150 I mA
15V 8.0 11.3 I mA
5V 5.7 8.8 I mA
Note 5: A heat sink is required to keep junction temperature below absolute maximum when an output is shorted.
AC Electrical Characteristics
(Note 8), V
e
g
S
15V, A
V
ea
2, R
e
e
R
F
G
560X,R
e
L
150X,T
unless otherwise specified.
Parameter Description Conditions Min Typ Max
BW
b
3 dB Bandwidth V
SR Slew Rate (Note 6) R
tr,t
t
PD
f
Rise Time, Fall Time V
Propagation Delay V
OS Overshoot V
t
S
0.1% Settling Time V
dG Differential Gain (Note 7) R
dP Differential Phase (Note 7) R
Note 6: Slew Rate is with V
Note 7: DC offset from
froma10V tob10V and measured ata5V andb5V.
OUT
b
0.714V toa0.714V, AC amplitude 286 mV
Note 8: All AC tests are performed on a ‘‘warmed up’’ part, except Slew Rate, which is pulse tested.
e
g
S
e
g
V
S
e
g
V
S
e
g
V
S
e
400X 1000 1500 IV V/ms
L
e
R
1kX,R
F
e
OUT
e
OUT
e
OUT
e
OUT
e
150X 0.025 V %
L
e
R
500X 0.006 V %
L
e
150X 0.1 V
L
e
R
500X 0.005 V
L
ea
15V, A
15V, A
5V, A
5V, A
g
500 mV 2.7 V ns
g
500 mV 3.2 V ns
g
500 mV 0 V %
g
2.5V, A
2 130 V MHz
V
ea
1 180 V MHz
V
ea
2 100 V MHz
V
ea
1 110 V MHz
V
e
G
e
110X,R
eb
V
PbP
400X 1500 V V/ ms
L
135Vns
,fe3.58 MHz.
Test
Level
Test
Level
Units
TDis 1.5inTDis 3.0in
e
25§C
A
Units
§
§
3
Page 4
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Non-Inverting Frequency
Response (Gain)
Inverting Frequency
Response (Gain)
Non-Inverting Frequency
Response (Phase)
Inverting Frequency
Response (Phase)
Frequency Response
for Various R
Frequency Response for
Various R
F
L
and R
G
3 dB Bandwidth vs Supply
Voltage for A
V
eb
1
Peaking vs Supply Voltage
eb
for A
1
V
4
3 dB Bandwidth vs
Temperature for A
V
eb
1
2360– 2
Page 5
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
3 dB Bandwidth vs Supply
Voltage for A
3 dB Bandwidth vs Supply
Voltage for A
V
V
ea
ea
1
2
Ð Contd.
Peaking vs Supply Voltage
ea
for A
Peaking vs Supply Voltage
for A
V
V
ea
1
2
3 dB Bandwidth vs Temperature
ea
for A
3 dB Bandwidth vs Temperature
for A
V
V
ea
1
2
3 dB Bandwidth vs Supply
Voltage for A
V
ea
10
Peaking vs Supply Voltage
ea
for A
10
V
5
3 dB Bandwidth vs Temperature
ea
for A
10
V
2360– 3
Page 6
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Frequency Response
for Various C
PSRR and CMRR
vs Frequency
L
Ð Contd.
Frequency Response
for Various C
2nd and 3rd Harmonic
Distortion vs Frequency
b
IN
Channel to Channel
Isolation vs Frequency
Transimpedance (R
vs Frequency
OL
)
Voltage and Current Noise
vs Frequency
Closed-Loop Output
Impedance vs Frequency
6
Transimpedance (R
vs Die Temperature
OL
)
2360– 4
Page 7
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Offset Voltage
vs Die Temperature
(4 Samples)
a
Input Resistance
vs Die Temperature
Ð Contd.
Supply Current
vs Die Temperature
(Per Amplifier)
Input Current
vs Die Temperature
Supply Current
vs Supply Voltage
(Per Amplifier)
a
Input Bias Current
vs Input Voltage
Output Voltage Swing
vs Die Temperature
Short Circuit Current
vs Die Temperature
7
PSRR & CMRR
vs Die Temperature
2360– 5
Page 8
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Differential Gain
vs DC Input Voltage,
e
R
150
L
Differential Gain
vs DC Input Voltage,
e
500
R
L
Ð Contd.
Differential Phase
vs DC Input Voltage,
e
R
150
L
Differential Phase
vs DC Input Voltage,
e
R
500
L
Small Signal
Pulse Response
Large Signal
Pulse Response
Slew Rate
vs Supply Voltage
8
Slew Rate
vs Temperature
2360– 6
Page 9
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Settling Time vs
Settling Accuracy
16-Lead Plastic SO
Maximum Power Dissipation
vs Ambient Temperature
Ð Contd.
2360– 15
Long Term Settling Error
16-Lead Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
2360– 16
2360– 7
2360– 8
9
Page 10
EL2360C
Triple 130 MHz Current Feedback Amplifier
Differential Gain And Phase Test Circuit
2360– 9
Simplified Schematic (One Amplifier)
10
2360– 10
Page 11
Triple 130 MHz Current Feedback Amplifier
Applications Information
EL2360C
Product Description
The EL2360C is a triple current feedback amplifier that offers wide bandwidth and good video
specifications at moderately low supply currents.
It is built using Elantec’s proprietary complimentary bipolar process and is offered in both a
16 pin PDIP and SOIC packages. Due to the current feedback architecture, the EL2360C clo-
b
sed
loopb3 dB bandwidth is dependent on the
value of the feedback resistor. First the desired
bandwidth is selected by choosing the feedback
resistor, R
gain resistor, R
, and then the gain is set by picking a
F
. The curves at the beginning of
G
the Typical Performance Curves section show the
effect of varying both R
and RG.Theb3dB
F
bandwidth is somewhat dependent on the power
supply voltage. As the supply voltage is decreased, internal junction capacitances increase,
causing a reduction in the closed loop bandwidth.
To compensate for this, smaller values of feedback resistor can be used at lower supply voltages.
Power Supply Bypassing and Printed
Circuit Board Layout
As with any high-frequency device, good printed
circuit board layout is necessary for optimum
performance. Ground plane construction is highly recommended. Lead lengths should be as short
as possible, preferably below (/4’’. The power supply pins must be well bypassed to reduce the risk
of oscillation. The combination of a 1.0 mF tantalum capacitor in parallel with a 0.01 mF ceramic
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). This implies keeping the
ground plane away from this pin. Carbon or Metal-Film resistors are acceptable with the MetalFilm resistors giving slightly less peaking and
bandwidth because of their additional series inductance. Use of sockets, particularly for the SO
package should be avoided if possible. Sockets
add parasitic inductance and capacitance which
will result in some additional peaking and overshoot.
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. The characteristic curve of gain vs. frequency with variations
in C
emphasizes this effect. The curve illus-
b
IN
trates how the bandwidth can be extended to beyond 200 MHz with some additional peaking
with an additional 2pF of capacitance at the
V
pin. For inverting gains, this parasitic ca-
b
IN
pacitance has little effect because the inverting
input is a virtual ground, but for non-inverting
gains, this capacitance (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 further exacerbates the problem by further lowering the pole frequency.
Feedback Resistor Values
The EL2360C has been designed and specified at
a gain of
a
2 with R
e
560X. This value of
F
feedback resistor yields relatively flat frequency
response with little to no peaking out to 130
MHz. Since the EL2360C is a current-feedback
amplifier, it is also possible to change the value
of R
to get more bandwidth. As seen in the
F
curve of Frequency Response For Various R
and RG, bandwidth and peaking can be easily
modified by varying the value of the feedback
resistor. For example, by reducing R
to 430X,
F
bandwidth can be extended to 170 MHz with under 1 dB of peaking. Further reduction of R
to
F
360X increases the bandwidth to 195 MHz with
about 2.5 dB of peaking.
Bandwidth vs Temperature
Whereas many amplifier’s supply current and
consequently
b
3 dB bandwidth drop off at high
temperature, the EL2360C was designed to have
little supply current variation with temperature.
An immediate benefit from this is that the
b
dB bandwidth does not drop off drastically with
temperature. With V
e
g
S
15V and A
V
ea
the bandwidth varies only from 150 MHz to 110
MHz over the entire die junction temperature
range of
b
50§CkTk150§C.
F
3
2,
11
Page 12
EL2360C
Triple 130 MHz Current Feedback Amplifier
Applications Information
Ð Contd.
Supply Voltage Range and Single Supply
Operation
The EL2360C has been designed to operate with
supply voltages from
g
2V tog15V. Optimum
bandwidth, slew rate, and video characteristics
are obtained at higher supply voltages. However,
g
at
2V supplies, theb3 dB bandwidth at A
a
2 is a respectable 70 MHz. The following figure
is an oscilloscope plot of the EL2360C at
supplies, A
V
ea
load of 150X, showing a clean
2, R
e
e
R
F
560X, driving a
G
g
600 mV signal at
e
V
g
2V
the output.
2360– 11
If a single supply is desired, values froma4V to
a
30V 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
EL2360C, which is typically 1.5V from each supply rail.
Settling Characteristics
The EL2360C offers superb settling characteristics to 0.1%, typically in the 35 ns to 40 ns range.
There are no aberrations created from the input
stage which often cause longer settling times in
other current feedback amplifiers. The EL2360C
is not slew rate limited, therefore any size step up
g
to
10V gives approximately the same settling
time.
As can be seen from the Long Term Settling Error curve, for A
ea
1, there is approximately a
V
0.035% residual which tails away to 0.01% in
about 40 ms. This is a thermal settling error
caused by a power dissipation differential (before
eb
and after the voltage step). For A
1, due to
V
the inverting mode configuration, this tail does
not appear since the input stage does not experience the large voltage change as in the non-inverting mode. With A
V
eb
1, 0.01% settling
time is slightly greater than 100 ns.
Power Dissipation
The EL2360C amplifier combines both high
speed and large output current capability at a
moderate supply current in very small packages.
It is possible to exceed the maximum junction
temperature allowed under certain supply voltage, temperature, and loading conditions. To ensure that the EL2360C remains within it’s absolute maximum ratings, the following discussion
will help to avoid exceeding the maximum junction temperature.
The maximum power dissipation allowed in a
package is determined according to[1]:
PD
MAX
T
e
JMAX
T
AMAX
i
JA
b
where:
e
T
JMAX
T
AMAX
i
JA
PD
MAX
Maximum Junction Temperature
e
Maximum Ambient Temperature
e
Thermal Resistance of the Package
e
Maximum Power Dissipation
in the Package.
The maximum power dissipation actually produced by an IC is the total quiescent supply current times the total power supply voltage, plus
the power in the IC due to the load, or[2
V
PD
MAX
where:
e
N
e
V
S
I
SMAX
e
N*(VS* I
SMAX
a
b
(V
V
S
Number of amplifiers
Total Supply Voltage
e
Maximum Supply Current per ampli-
OUT
OUT
)
) *
RL
fier
e
V
OUT
Maximum Output Voltage of the Application
e
R
L
12
Load Resistance tied to Ground
[1]
]
[2]
Page 13
EL2360C
Triple 130 MHz Current Feedback Amplifier
Applications Information
If we set the two PD
equal to each other, and solve for V
equations,[1]and[2],
MAX
Ð Contd.
, we can get a
S
family of curves for various loads and output
voltages according to[3]:
RL*(T
e
V
S
b
JMAX
N*i
JA
(IS*RL)aV
T
AMAX
)
OUT
a
2
(V
)
OUT
[3]
The figures below show total supply voltage V
vs RLfor various output voltage swings for the
PDIP and SOIC packages. The curves assume
WORST CASE conditions of T
e
I
11.3 mA per amplifier. The curves do not
S
A
ea
85§C and
include heat removal or forcing air, or the simple
fact that the package will be attached to a circuit
board, which can also provide some form of heat
removal. Larger temperature and voltage ranges
are possible with heat removal and forcing air
past the part.
Supply Voltage vs R
for Various V
L
(PDIP Package)
OUT
Current Limit
The EL2360C has internal current limits that
protect the circuit in the event of an output being
shorted to ground. This limit is set at 100 mA
nominally and reduces with the junction temperature. At T
e
150§C, the current limits at about
J
65 mA. If any one output is shorted to ground,
the power dissipation could be well over 1W, and
much greater if all outputs are shorted. Heat removal is required in order for the EL2360C to
S
survive an indefinite short.
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 de-couple the EL2360C
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 5X and 50X) can be placed
in series with the output to eliminate most peaking. The gain resistor (R
) can then be chosen to
G
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
) to reduce the
F
peaking.
Supply Voltage vs R
for Various V
OUT
L
(SOIC Package)
2360– 12
2360– 13
13
Page 14
EL2360C
Triple 130 MHz Current Feedback Amplifier
EL2360C Macromodel
* EL2360C Macromodel
* Revision A, June 1996
* AC characteristics used: Rf
* Pin numbers reflect a standard single opamp
* Connections:
*
*
*
*
*
.subckt EL2360/EL 3 2 7 4 6
*
* Input Stage
*
e1100301.0
vis 10 9 0V
h2 9 12 vxx 1.0
r1211130
l1 11 12 25nH
iinp 3 0 0.5mA
iinm205mA
r12302Meg
*
* Slew Rate Limiting
*
h1 13 0 vis 600
r2 13 14 1K
d1 14 0 dclamp
d2 0 14 dclamp
*
* High Frequency Pole
*
e2 30 0 14 0 0.00166666666
l3 30 17 0.43mH
c5 17 0 0.27pF
r5 17 0 500
*
eRge
560 ohms
a
input
b
input
l
ll
lll
a
V
supply
b
llll
lllll
V
supply
output
* Transimpedance Stage
*
g10181701.0
rol 18 0 2Meg
cdp 18 0 2.285pF
*
* Output Stage
*
q141819qp
q271820qn
q371921qn
q442022qp
r7 21 6 4
r8 22 6 4
ios1 7 19 2mA
ios2 20 4 2mA
*
* Supply Current
*
ips 7 4 2.5mA
*
* Error Terms
*
ivos 0 23 2mA
vxx 23 0 0V
e4240301.0
e5250701.0
e626040
r9 24 23 562
r10 25 23 1K
r11 26 23 1K
*
* Models
*
.model qn npn(is
.model qp pnp(is
.model dclamp d(is
abve
.ends
b
1.0
2.24v ne4)
e5eb
15 bfe100 tfe0.1 ns)
e5eb
15 bfe100 tfe0.1 ns)
e1eb
30 ibve0.266
TDis 4.8inTDis 5.1in
14
Page 15
EL2360C
Triple 130 MHz Current Feedback Amplifier
EL2360C Macromodel
Ð Contd.
2360– 14
15
Page 16
EL2360C
Triple 130 MHz Current Feedback Amplifier
EL2360CJune 1996 Rev A
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 circuitry 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 Ð 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 in-
Elantec, Inc.
1996 Tarob Court
Milpitas, CA 95035
Telephone: (408) 945-1323
(800) 333-6314
Fax: (408) 945-9305
European Office: 44-71-482-4596
tended to support 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 contemplating 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. Elantec, Inc.’s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages.
Printed in U.S.A.16
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