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EL2260, EL2460
Data Sheet January 1995, Rev B
Dual/Quad 130MHz Current Feedback
Amplifiers
The EL2260/EL2460 are dual/quad
current feedback operational amplifiers
with -3dB bandwidth of 130MHz at a
gain of +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 operational amplifier.
The EL2260/EL2460 are designed to drive a double
terminated 75Ω coax cable to video levels. Differential gain
and phase are excellent when driving both loads of 500Ω
(< 0.01%/< 0.01°) and double terminated 75Ω cables
(0.025%/0.1°).
The amplifiers can operate on any supply voltage from 4V
(±2V) to 33V (±16.5V), yet consume only 7.5mA per
amplifier at any supply voltage. Using industry standard
pinouts, the EL2260 is available in 8-pin PDIP and 8-pin SO
packages, while the EL2460 is available in 14-pin PDIP and
14-pin SO packages.
Elantec’s facilities comply with MIL-I-45208A and offer
applicable quality specifications. For information on Elantec’s
processing, see the Elantec document, QRA-1: Elantec’s
Processing—Monolithic Products.
Pinouts
FN7064
Features
• 130MHz 3dB bandwidth
= +2)
(A
V
• 180MHz 3dB bandwidth
= +1)
(A
V
• 0.01% differential gain, R
• 0.01° differential phase, R
= 500Ω
L
=500Ω
L
• Low supply current, 7.5mA per amplifier
• Wide supply range, ±2V to ±15V
• 80mA output current (peak)
• Low cost
• 1500V/µs slew rate
• Input common mode range to within 1.5V of supplies
• 35ns settling time to 0.1%
Applications
• Video amplifiers
• Cable drivers
• RGB amplifiers
• Test equipment amplifiers
• Current to voltage converter
EL2260
(8-PIN SO, PDIP)
TOP VIEW
EL2460
(14-PIN SO, PDIP)
TOP VIEW
Ordering Information
PART
NUMBER TEMP. RANGE PACKAGE PKG. NO.
EL2260CN -40°C to +85°C 8-Pin PDIP MDP0031
EL2260CS -40°C to +85°C 8-Pin SOIC MDP0027
EL2460CN -40°C to +85°C 14-Pin PDIP MDP0031
EL2460CS -40°C to +85°C 14-Pin SOIC MDP0027
1
Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
EL2260, EL2460
Absolute Maximum Ratings (T
Voltage between V
Voltage between +IN and -IN. . . . . . . . . . . . . . . . . . . . . . . . . . . .±6V
Current into +IN or -IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Internal Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . See Curves
+ and VS-. . . . . . . . . . . . . . . . . . . . . . . . . .+33V
S
= 25°C)
A
Operating Junction Temperature
Plastic Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150°C
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C
Output Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50mA
Operating Ambient Temperature Range . . . . . . . . . .-40°C to +85°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests , therefore: TJ = TC = T
Open-Loop DC Electrical Specifications V
A
= ±15V, RL = 150Ω, TA = 25°C unless otherwise specified.
S
LIMITS UNITS
PARAMETER DESCRIPTION CONDITIONS TEMP
V
OS
TC V
OS
+I
IN
-I
IN
CMRR Common Mode Rejection Ratio
-ICMR -Input Current Common
Input Offset Voltage VS = ±5V, ±15V 25°C 2 10 mV
T
, T
MIN
Average Offset Voltage Drift (Note 1) Full 10 µV/°C
+Input Current VS = ±5V, ±15V 25°C 0.5 5 µA
T
, T
MIN
-Input Current VS = ±5V, ±15V 25°C 5 25 µA
T
, T
MIN
V
= ±5V, ±15V Full 50 55 dB
(Note 2)
Mode Rejection (Note 2)
S
V
= ±5V, ±15V 25°C 0.2 5 µA/V
S
T
, T
MIN
MAX
MAX
MAX
MAX
MIN TYP MAX
15 mV
10 µA
35 µA
5µA/V
PSRR Power Supply Rejection Ratio (Note 3) Full 75 95 dB
-IPSR -Input Current Power Supply Rejection
(Note 3)
R
+R
+C
OL
IN
IN
Transimpedance (Note 4) VS = ±15V
+Input Resistance Full 1.5 3.0 MΩ
+Input Capacitance 25°C 2.5 pF
CMIR Common Mode Input Range V
V
O
Output Voltage Swing RL = 400Ω,
R
= 400Ω
L
V
= ±5V
S
R
= 150Ω
L
= ±15V 25°C ±13.5 V
S
V
= ±5V 25°C ±3.5 V
S
V
=±15V
S
R
= 150Ω,
L
V
=±15V
S
25°C 0.2 5 µA/V
T
MIN
, T
MAX
5µA/V
25°C 500 2000 kΩ
T
MIN
, T
MAX
250 kΩ
25°C 500 1800 kΩ
T
MIN
, T
MAX
250 kΩ
25°C ±12 ±13.5 V
T
MIN
, T
MAX
±11 V
25°C ±12 V
= 150Ω,
R
L
V
=±5V
S
I
SC
Output Short Circuit Current (Note 5) VS = ±5V, VS = ±15V 25°C 60 100 150 mA
25°C ±3.0 ±3.7 V
T
MIN
, T
MAX
±2.5 V
2
EL2260, EL2460
Open-Loop DC Electrical Specifications V
= ±15V, RL = 150Ω, TA = 25°C unless otherwise specified. (Continued)
S
LIMITS UNITS
PARAMETER DESCRIPTION CONDITIONS TEMP
I
S
R
OL
Supply Current (Per Amplifier) VS = ±15V 25°C 7.5 11.0 mA
T
, T
MIN
= ±5V 25°C 5.4 8.5 mA
V
S
T
, T
MIN
Transimpedance (Note 6) VS = ±15V
R
= 400Ω
L
25°C 500 2000 kΩ
MAX
MAX
MIN TYP MAX
11.0 mA
8.5 mA
NOTES:
1. Measured from T
= ±10V for VS = ±15V and TA= Full
2. V
CM
V
= ±3V for VS = ±5V and TA = 25°C
CM
V
= ±2V for VS = ±5V and TA = T
CM
MIN
to T
MAX
.
, T
MIN
MAX
3. The supplies are moved from ±2.5V to ±15V.
4. The supplies are moved from ±2.5V to ±15V.
5. A heat sink is required to keep junction temperature below absolute maximum when an output is shorted.
6. The supplies are moved from ±2.5V to ±15V.
Closed-Loop AC El ectrical Specifications V
PARAMETER DESCRIPTION TEST CONDITIONS
BW -3dB Bandwidth (Note 1) V
= ±15V, AV = +2, RF = 560Ω, RL = 150Ω, TA = 25°C unless otherwise noted
S
LIMITS
UNITS
MIN TYP MAX
= ±15V, AV = +2 130 MHz
S
VS = ±15V, AV = +1 180 MHz
V
= ±5V, AV = +2 100 MHz
S
V
= ±5V, AV = +1 110 MHz
S
SR Slew Rate (Note 1) (Note 2) RL = 400Ω 1000 1500 V/µs
R
= 1kΩ, RG = 110Ω 1500 V/µs
F
R
= 400Ω
L
tR, t
F
t
PD
OS Overshoot (Note 1) V
t
S
dG Differential Gain (Note 1)(Note 3) R
dP Differential Phase (Note 1)(Note 3) R
Rise Time, Fall Time (Note 1) V
= ±500mV 2.7 ns
OUT
Propagation Delay (Note 1) 3.2 ns
= ±500mV 0 %
OUT
0.1% Settling Time (Note 1) V
= ±10V 35 ns
OUT
A
= -1, RL = 1k
V
= 150Ω 0.025 %
L
= 500Ω 0.006 %
R
L
= 150Ω 0.1 deg (°)
L
R
= 500Ω 0.005 deg (°)
L
NOTES:
1. All AC tests are performed on a “warmed up” part, except for Slew Rate, which is pulse tested.
2. Slew Rate is with V
3. DC offset from -0.714V through +0.714V, AC amplitude 286mV
from +10V to -10V and measured at the 25% and 75% points.
OUT
, f = 3.58MHz.
P-P
3
Typical Performance Curves
EL2260, EL2460
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 RF and R
L
G
3dB Bandwidth vs Supply Voltage
for AV = -1
Peaking vs Supply Voltage
for AV = -1
3dB Bandwidth vs
Temperature for AV = - 1
4
Typical Performance Curves (Continued)
EL2260, EL2460
3dB Bandwidth vs Supply
Voltage for AV = +1
3dB Bandwidth vs Supply
Voltage for AV = +2
Peaking vs Supply Vol ta ge
for AV = +1
Peaking vs Supply Vol ta ge
for AV = +2
3dB Bandwidth vs Temperature
for AV = +1
3dB Bandwidth vs Temperature
for AV = +2
3dB Bandwidth vs Supply
Voltage for AV = +10
Peaking vs Supply Vol ta ge
for AV = +10
3dB Bandwidth vs Temperature
for AV = +10
5
Typical Performance Curves (Continued)
EL2260, EL2460
Frequency Response
for Various C
PSRR and CMRR
vs Frequency
L
Frequency Response
for Various CIN-
2nd and 3rd Harmonic
Distortion vs Frequency
Channel to Channel
Isolation vs Frequency
Transimpedance (ROL)
vs Frequency
Voltage and Current Noise
vs Frequency
Closed-Loop Output
Impedance vs Frequency
Transimpedance (ROL)
vs Die Temperature
6
Typical Performance Curves (Continued)
EL2260, EL2460
Offset Voltage
vs Die Temperature
(4 Samples)
+Input Resistance
vs Die Temperature
Supply Current
vs Die Temperature
(Per Amplifier)
Input Current
vs Die Temperature
Supply Current
vs Supply Voltage
(Per Amplifier)
+Input Bias Current
vs Input Voltage
Output Voltage Swing
vs Die Temperature
Short Circuit Current
vs Die Temperature
PSRR & CMRR
vs Die Temperature
7
Typical Performance Curves (Continued)
EL2260, EL2460
Differential Gain
vs DC Input Voltage,
RL = 150
Differential Gain
vs DC Input Voltage,
RL = 500
Differential Phase
vs DC Input Voltage,
RL = 150
Differential Phase
vs DC Input Voltage,
RL = 500
Small Signal
Pulse Response
Large Signal
Pulse Response
Slew Rate
vs Supply Voltage
Slew Rate
vs Temperature
8
Typical Performance Curves (Continued)
EL2260, EL2460
Settling Time
vs Settling Accuracy
Long Term Settling Error
14-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
8-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
14-Pin Plastic SO
Maximum Power Dissipation
vs Ambient Temperature
8-Pin Plastic SO
Maximum Power Dissipation
vs Ambient Temperature
Burn-In Circuits
EL2460
EL2260
9
EL2260, EL2460
Differential Gain and Phase Test Circuit
Simplified Schematic (One Amplifier)
10
EL2260, EL2460
Applications Information
Product Description
The EL2260/EL2460 are dual and quad current mode
feedback amplifiers that offer wide bandwidths and good
video specifications at moderately low supply currents. They
are built using Elantec’s proprietary complimentary bipolar
process and are offered in industry standard pinouts. Due to
the current feedback architecture, the EL2260/EL2460
closed-loop 3dB bandwidth is dependent on the value of the
feedback resistor. First the desired bandwidth is selected by
choosing the feedback resistor, R
by picking the gain resistor, R
of the Typical Perf ormance Curves section show the effect of
varying both R
dependent on the power supply voltage. As the supply
voltage is decreased, internal junction capacitances
increase, causing a reduction in closed loop bandwidth. To
compensate for this, smaller values of feedback resistor can
be used at lower supply voltages.
and RG. The 3dB bandwidth is somewhat
F
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, below 1/4”. The power supply pins must
be well bypassed to reduce the risk of oscillation. A 1.0µF
tantalum capacitor in parallel with a 0.01µF ceramic
capacitor is adequate for each supply pin.
For good AC performance, parasitic capacitances should be
kept to a minimum, especially at the inverting input (see
Capacitance at the Inverting Input section). This implies
keeping the ground plane away from this pin. Carbon
resistors are acceptable, while use of wire-wound resistors
should not be used because of their parasitic inductance.
Similarly, capacitors should be low inductance for best
performance. Use of sockets, particularly for the SO
packages, should be avoided. Sockets add parasitic
inductance and capacitance which will result in peaking and
overshoot.
, and then the gain is set
F
. The curves at the beginning
G
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 EL2260 and EL2460 have been designed and specified
with R
yields extremely flat frequency response with little to no
peaking out to 130MHz. 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. By
reducing R
170MHz with under 1dB of peaking. Further reduction of R
to 360Ω increases the bandwidth to 195MHz with about
2.5dB of peaking. See the curves in the Typical Performance
Curves section which show 3dB bandwidth and peaking vs.
frequency for various feedback resistors and various supply
voltages.
=560Ω for AV= +2. This value of feedback resistor
F
to 430Ω, bandwidth can be extended to
F
Bandwidth vs Temperature
Whereas many amplifier’s supply current and consequently
3dB bandwidth drop off at high temperature, the
EL2260/EL2460 were 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. With V
only varies from 150MHz to 110MHz over the entire die
junction temperature range of 0°C < T < 150°C.
= ±15V and AV = +2, the bandwidth
S
Supply Voltage Range
The EL2260/EL2460 has been designed to operate with
supply voltages from ±2V to ±15V. Optimum bandwidth, slew
rate, and video characteristics are obtained at higher supply
voltages. However, at ±2V supplies, the 3dB bandwidth at
A
= +2 is a respectable 70MHz. The following figure is an
V
oscilloscope plot of the EL2260 at ±2V supplies, A
R
F=RG
±600mV signal at the output.
=560Ω, driving a load of 150Ω, showing a clean
=+2,
V
F
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 EL2260/EL2460 when
operating in the non-inverting configuration. The
characteristic curve of gain vs. frequency with variations of
C
- emphasizes this effect. The curve illustrates how the
IN
bandwidth can be extended to beyond 200MHz with some
additional peaking with an additional 2pF of capacitance at
the V
- pin for the case of AV= +2. Higher values of
IN
capacitance will be required to obtain similar effects at
higher gains.
11
If a single supply is desired, values from +4V to +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)
EL2260, EL2460
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 EL2260/EL2460.
Settling Characteristics
The EL2260/EL2460 offer superb settling characteristics to
0.1%, typically in the 35ns to 40ns range. There are no
aberrations created from the input stage which often cause
longer settling times in other current feedback amplifiers.
The EL2260/EL2460 are not slew rate limited, therefore any
size step up to ±10V gives approximately the same settling
time.
As can be seen from the Long Term Settling Error curve, for
A
= +1, there is approximately a 0.035% residual which
V
tails away to 0.01% in about 40µs. This is a thermal settling
error caused by a power dissipation differential (before and
after the voltage step). For A
= -1, due to the inverting
V
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
= -1, 0.01% settling time is
V
slightly greater than 100ns.
Power Dissipation
The EL2260/EL2460 amplifiers combine both high speed
and large output current drive 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 EL2260/EL2460 remain within their
absolute maximum ratings, the following discussion will help
to avoid exceeding the maximum junction temperature.
Unlike some amplifiers, such as the L T1229 and LT1230, the
EL2260/EL2460 maintain almost constant supply current
over temperature so that AC performance is not degraded as
much over the entire operating temperature range. Of
course, this increase in performance doesn’t come for free.
Since the current has increased, supply voltages must be
limited so that maximum power ratings are not exceeded.
Each amplifier in the EL2260/EL2460 consume typically
7.5mA and maximum 10.0mA. The worst case power in an
IC occurs when the output voltage is at half supply, if it can
go that far, or its maximum value if it cannot reach
half supply. If we assume that the EL2260/EL2460 is used
for double terminated video cable driving applications
(R
= 150Ω), and the gain = +2, then the maximum output
L
voltage is 2V, and the average output voltage is 1.4V. If we
set the two P
for V
, we can get a family of curves for various packages
S
equations equal to each other, and solve
Dmax
and conditions according to:
RLT
--------------------------------------------------------------- V
------------------------------------------------------------------------------------------ -=
V
S
–()×
JMAXTAMAX
N θ
×
JA
2I
××()V
+
SRL
OUT
()+
OUT
The following curve shows supply voltage (±VS) vs.
temperature for the various packages assuming A
R
= 150, and V
L
case conditions (I
V
peak = 2V).
OUT
peak = 2V. The curves include worst
OUT
= 10mA and all amplifiers operating at
S
Supply Voltage vs Ambient Temperature
for All Packages of EL2260/EL2460
=+ 2,
V
The maximum power dissipation allowed in a package is
determined by its thermal resistance and the amount of
temperature rise according to:
T
–
P
DMAX
JMAXTAMAX
---------------------------------------------=
θ
JA
The maximum power dissipation actually produced by an IC
is the total quiescent supply current times the to tal power
supply voltage plus the power in the IC due to the load, or
P
DMAX
N2VSISVSV
×=
–()
where N is the number of amplifiers per package, and I
OUT
V
--------------- -
×+××
OUT
R
L
is
S
the current per amplifier. (To be more accurate, the
quiescent supply current flowing in the output driver
transistor should be subtracted from the first term because,
under loading and due to the class AB nature of the output
stage, the output driver current is now included in the second
term.)
In general, an amplifier’s AC performance degrades at
higher operating temperature and lower supply current.
The curves do not include heat removal or forcing air, or the
simple fact that the package will probably 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.
Current Limit
The EL2260/EL2460 have internal current limits that protect
the circuit in the event of the output being shorted to ground.
This limit is set at 100mA nominally and reduces with
junction temperature. At a junction temperature of 150°C, the
current limits at about 65mA. 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
12
EL2260, EL2460
required in order for the EL2260/EL2460 to survive an
indefinite short.
Channel to Channel Isolation
Due to careful biasing connections within the internal
circuitry of the EL2260/EL2460, exceptionally good channel
to channel isolation is obtained. Isolation is over 70dB at
video frequencies of 4MHz, and over 65dB up to 10MHz.
The EL2460 isolation is improved an additional 10dB, up to
about 5MHz, for amplifiers A to B and amplifiers C to D.
Isolation is improved another 8dB for ampli fi e rs A to C and
amplifiers B to D. See the curve in the Typical Performance
Curves section for more detail.
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
decouple the EL2260 and EL2460 from the capacitive cable
and allow extensive capacitive drive. However, other
applications may have high capacitive loads without
termination resistors. In these applications, an additional
small value (5Ω–50Ω) resistor in series with the output will
eliminate most peaking. The gain resistor, R
chosen to make up for the gain loss created by this
additional series resistor at the output.
, can be
G
13
EL2260, EL2460
EL2260/EL2460 Macromodel
* Revision A, March 1993
* AC Characteristics used CIN- (pin 2) = 1pF; RF = 560Ω
* Connections: +input
* | -input
* | | +Vsupply
* | | | -Vsupply
* | | | | output
* | | | | |
.subckt EL2260/EL 3 2 7 4 6
*
* Input Stage
*
e1 10 0 3 0 1.0
vis 10 9 0V
h2 9 12 vxx 1.0
r1 2 11 130
l1 11 12 25nH
iinp 3 0 0.5µA
iinm 2 0 5µA
r12 3 0 2Meg
*
* 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 0.43µH
c5 17 0 0.27pF
r5 17 0 500
*
* Transimpedance Stage
*
g1 0 18 17 0 1.0
ro1 18 0 2Meg
cdp 18 0 2.285pF
*
* Output Stage
*
q1 4 18 19 qp
q2 7 18 20 qn
q3 7 19 21 qn
q4 4 20 22 qp
r7 21 6 4
r8 22 6 4
ios1 7 19 2mA
ios2 20 4 2mA
*
* Supply Current
*
ips 7 4 2mA
*
* Error Terms
*
ivos 0 23 2mA
14
vxx 23 0 0V
e4 24 0 3 0 1.0
e5 25 0 7 0 1.0
e6 26 0 4 0 1.0
r9 24 23 562
r10 25 23 1K
r11 26 23 1K
*
* Models
*
.model qn npn (is=5e-15 bf=100 tf=0.1ns)
.model qp pnp (is=5e-15 bf=100 tf=0.1ns)
.model dclamp d (is=1e-30 ibv=0.266 bv=2.24 n=4)
.ends
EL2260, EL2460
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reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
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15
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