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.

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General Description

The EL2244C/EL2444C are dual and quad versions of the popular
EL2044C. They are high speed, low power, low cost monolithic oper-
ational amplifiers built on Elantec's proprietary complementary
bipolar process. The EL2244C/EL2444C are unity-gain stable and
feature a 325V/µs slew rate and 120MHz gain-bandwidth product
while requiring only 5.2mA of supply current per amplifier.

The power supply operating range of the EL2244C/EL2444C is from
±18V down to as little as ±2V. For single-supply operation, the
EL2244C/EL2444C operate from 36V down to as little as 2.5V. The
excellent power supply operating range of the EL2244C/EL2444C
makes them an obvious choice for applications on a single +5V or
+3V supply.

The EL2244C/EL2444C also feature an extremely wide output volt-
age swing of ±13.6V with V

= ±15V and R

= 1000

. At ±5V,

output voltage swing is a wide ±3.8V with R

= 500

and ±3.2V with

= 150

. Furthermore, for single-supply operation at +5V, output

voltage swing is an excellent 0.3V to 3.8V with R

= 500

At a gain of +1, the EL2244C/EL2444C have a -3dB bandwidth of
120MHz with a phase margin of 50°. They can drive unlimited load
capacitance, and because of their conventional voltage-feedback
topology, the EL2244C/EL2444C allow the use of reactive or non-lin-
ear elements in their feedback network. This versatility combined with
l o w c o s t a n d 7 5 m A o f o u t p u t - c u r r e n t d r i v e m a k e t h e
EL2244C/EL2444C an ideal choice for price-sensitive applications
requiring low power and high speed.

Connection Diagrams

EL2244CN/CS

Dual

EL2444CN/CS

Quad

Features

· 120MHz gain-bandwidth product
· Unity-gain stable
· Low supply current (per amplifier)

- 5.2mA at V

= ±15V

· Wide supply range - ±2V to ±18V

dual-supply, 2.5V to 36V single-

supply

· High slew rate - 325V/µs
· Fast settling - 80ns to 0.1% for a

10V step

· Low differential gain - 0.04% at

= +2, R

= 150¾

· Low differential phase - 0.15° at

= +2, R

= 150

· Stable w/ unlimited capacitive load
· Wide output voltage swing -

±13.6V with V

= ±15V, R

1000

3.8V/0.3V with V

= +5V,

= 500

· Low cost, enhanced replacement

for the AD827

andLT1229/LT1230

Applications

· Video amplifier
· Single-supply amplifier
· Active filters/integrators
· High-speed sample-and-hold
· High-speed signal processing
· ADC/DAC buffer
· Pulse/RF amplifier
· Pin diode receiver
· Log amplifier
· Photo multiplier amplifier
· Difference amplifier

Ordering Information

Part No.

Temp. Range

Package

Outline #

EL2244CN

-40°C to +85°C

8-Pin P-DIP

MDP0031

EL2244CS

-40°C to +85°C

8-Lead SO

MDP0027

EL2444CN

-40°C to +85°C

14-Pin P-DIP

MDP0031

EL2444CS

-40°C to +85°C

14-Lead SO

MDP0027

EL2444CM

-40°C to +85°C

16-Lead SOL

MDP0027

EL2244C, EL2444C

Dual/Quad Low-Power 120MHz Unity-Gain Stable Op Amp

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EL2244C, EL2444C

Dual/Quad Low-Power 120MHz Unity-Gain Stable Op Amp

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Absolute Maximum Ratings

= 25 °C)

Supply Voltage (V

)

±18V or 36V

Peak Output Current (I

)

Short-Circuit Protected

Output Short-Circuit Duration

Infinite

A heat-sink is required to keep junction temperature

below absolute maximum when an output is shorted.
Input Voltage (V

IN)

±V

Differential Input Voltage (dV

)

±10V

Power Dissipation (P

)

See Curves

Operating Temperature Range (T

)

-40°C to +85°C

Operating Junction Temperature (T

)

150°C

Storage Temperature (T

)

-65°C to +150°C

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

= T

DC Electrical Characteristics

= ±15V, R

= 1000

, unless otherwise specified

Parameter

Description

Condition

Temp

Min

Typ

Max

Unit

Input Offset
Voltage

= ±15V

25°C

0.5

4.0

MIN

, T

MAX

9.0

TCV

Average Offset Voltage Drift

[1]

All

10.0

µV/°C

Input Bias
Current

= ±15V

25°C

2.8

8.2

µA

MIN

, T

MAX

11.2

µA

= ±5V

25°C

2.8

µA

Input Offset
Current

= ±15V

25°C

300

MIN

, T

MAX

500

= ±5V

25°C

TCI

Average Offset Current Drift

[1]

All

0.3

nA/°C

VOL

Open-Loop Gain

= ±15V,V

OUT

= ±10V, R

= 1000

25°C

800

1500

V/V

MIN

, T

MAX

600

V/V

= ±5V, V

OUT

= ±2.5V, R

= 500

25°C

1200

V/V

= ±5V, V

OUT

= ±2.5V, R

= 150

25°C

1000

V/V

PSRR

Power Supply
Rejection Ratio

= ±5V to ±15V

25°C

MIN

, T

MAX

CMRR

Common-Mode
Rejection Ratio

= ±12V, V

OUT

= 0V

25°C

MIN

, T

MAX

CMIR

Common-Mode
Input Range

= ±15V

25°C

±14.0

= ±5V

25°C

±4.2

= +5V

25°C

4.2/0.1

OUT

Output Voltage
Swing

= ±15V, R

= 1000

25°C

±13.4

±13.6

MIN

, T

MAX

±13.1

= ±15V, R

= 500

25°C

±12.0

±13.4

= ±5V, R

= 500

25°C

±3.4

±3.8

= ±5V, R

= 150

25°C

±3.2

= +5V, R

= 500

25°C

3.6/0.4

3.8/0.3

MIN

, T

MAX

3.5/0.5

Output Short
Circuit Current

25°C

MIN

, T

MAX

Supply Current
(Per Amplifier)

= ±15V, No Load

25°C

5.2

MIN

7.6

MAX

7.6

= ±5V, No Load

25°C

5.0

EL2244C, EL2444C

Dual/Quad Low-Power 120MHz Unity-Gain Stable Op Amp

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Closed-Loop AC Electrical Characteristics

= ±15V, A

= +1, R

= 1000

unless otherwise specified

Parameter

Description

Condition

Temp

Min

Typ

Max

Unit

-3dB Bandwidth
(V

OUT

= 0.4V

)

= ±15V, A

= +1

25°C

120

MHz

= ±15V, A

= -1

25°C

MHz

= ±15V, A

= +2

25°C

MHz

= ±15V, A

= +5

25°C

MHz

= ±15V, A

= +10

25°C

MHz

= ±5V, A

= +1

25°C

MHz

GBWP

Gain-Bandwidth Product

= ±15V

25°C

MHz

= ±5V

25°C

MHz

Phase Margin

= 1 k¾, C

= 10pF

25°C

Channel Separation

f = 5MHz

25°C

Slew Rate

[1]

= ±15V, R

= 1000

25°C

250

325

V/µs

= ±5V, R

= 500

25°C

200

V/µs

FPBW

Full-Power Bandwidth

[2]

= ±15V

25°C

4.0

5.2

MHz

= ±5V

25°C

12.7

MHz

, t

Rise Time, Fall Time

0.1V Step

25°C

3.0

Overshoot

0.1V Step

25°C

Propagation Delay

25°C

2.5

Settling to +0.1%
(A

= +1)

= ±15V, 10V Step

25°C

= ±5V, 5V Step

25°C

Differential Gain

[3]

NTSC/PAL

25°C

0.04

Differential Phase

[3]

NTSC/PAL

25°C

0.15

Input Noise Voltage

10kHz

25°C

15.0

Input Noise Current

10kHz

25°C

1.50

CI STAB

Load Capacitance Stability

= +1

25°C

Infinite

1. Slew rate is measured on rising edge
2. For V

= ±15V, V

OUT

= 20V

. For V

= ±5V, V

OUT

= 5V

. Full-power bandwidth is based on slew rate measurement using: FPBW = SR/(2

Vpeak).

3. Video Performance measured at V

= ±15V, A

= +2 with 2 times normal video level across R

= 150

. This corresponds to standard video levels

across a back-terminated 75

load. For other values of R

, see curves.

EL2244C, EL2444C

Dual/Quad Low-Power 120MHz Unity-Gain Stable Op Amp

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Applications Information

Product Description

The EL2244C/EL2444C are low-power wideband
monolithic operational amplifiers built on Elantec's pro-
prietary high-speed complementary bipolar process. The
EL2244C/EL2444C use a classical voltage-feedback
topology which allows them to be used in a variety of
applications where current-feedback amplifiers are not
appropriate because of restrictions placed upon the feed-
back element used with the amplifier. The conventional
topology of the EL2244C/EL2444C allows, for exam-
ple, a capacitor to be placed in the feedback path,
making it an excellent choice for applications such as
active filters, sample-and-holds, or integrators. Simi-
larly, because of the ability to use diodes in the feedback
network, the EL2244C/EL2444C are an excellent choice
for applications such as fast log amplifiers.

Power Dissipation

With the wide power supply range and large output drive
capability of the EL2244C/EL2444C, it is possible to
exceed the 150°C maximum junction temperatures
under certain load and power-supply conditions. It is
therefore important to calculate the maximum junction
temperature (T

Jmax

) for all applications to determine if

power supply voltages, load conditions, or package type
need to be modified for the EL2244C/EL2444C to
remain in the safe operating area. These parameters are
related as follows:

Jmax

= T

max

+ (

JA*

(PDmaxtotal))

where PDmaxtotal is the sum of the maximum power
dissipation of each amplifier in the package (PDmax).
PDmax for each amplifier can be calculated as follows:

PDmax= (2*V

Smax

+(V

-V

outmax

)*(V

outmax

))

where:

max

=Maximum Ambient Temperature

=Thermal Resistance of the Package

PDmax =Maximum Power Dissipation of 1 Amplifier

=Supply Voltage

Smax

=Maximum Supply Current of 1 Amplifier

outmax

=Maximum Output Voltage Swing of the

Application

=Load Resistance

To serve as a guide for the user, we can calculate maxi-
mum allowable supply voltages for the example of the
video cable-driver below since we know that T

Jmax

150°C, T

max

= 75°C, I

Smax

= 7.6mA, and the package

s are shown in Table 1. If we assume (for this exam-

ple) that we are driving a back-terminated video cable,
then the maximum average value (over duty-cycle) of
V

outmax

is 1.4V, and R

= 150¾, giving the results seen

in Table 1.

Single-Supply Operation

The EL2244C/EL2444C have been designed to have a
wide input and output voltage range. This design also
makes the EL2244C/EL2444C an excellent choice for
single-supply operation. Using a single positive supply,
the lower input voltage range is within 100mV of ground
(R

= 500

), and the lower output voltage range is

within 300 mV of ground. Upper input voltage range
reaches 4.2V, and output voltage range reaches 3.8V
with a 5V supply and R

= 500

. This results in a 3.5V

output swing on a single 5V supply. This wide output
voltage range also allows single-supply operation with a
supply voltage as high as 36V or as low as 2.5V. On a
single 2.5V supply, the EL2244C/EL2444C still have
1V of output swing.

Gain-Bandwidth Product and the-3dB
Bandwidth

The EL2244C/EL2444C have a gain-bandwidth product
of 120 MHz while using only 5.2mA of supply current
per amplifier. For gains greater than 4, their closed-loop
-3 dB bandwidth is approximately equal to the gain-

Table 1

Duals

Package

Max PDiss @ T

max

Max V

EL2244CN

PDIP8

95°C/W

0.789W @ 75°C

±16.6V

EL2244CS

SO8

150°C/W

0.500W @ 75°C

±10.7V

QUADS
EL2444CN

PDIP14

70°C/W

1.071W @ 75°C

±11.5V

EL2444CS

SO14

110°C/W

0.682W @ 75°C

±7.5V

EL2244C, EL2444C

Dual/Quad Low-Power 120MHz Unity-Gain Stable Op Amp

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bandwidth product divided by the noise gain of the cir-
cuit. For gains less than 4, higher-order poles in the
amplifiers' transfer function contribute to even higher
c l o s e d l o o p b a n d w i d t h s . F o r e x a m p l e , t h e
EL2244C/EL2444C have a -3dB bandwidth of 120MHz
at a gain of +1, dropping to 60MHz at a gain of +2. It is
important to note that the EL2244C/EL2444C have been
designed so that this "extra" bandwidth in low-gain
applications does not come at the expense of stability.
As seen in the typical performance curves, the
EL2244C/EL2444C in a gain of +1 only exhibit 1.0dB
of peaking with a 1000

load.

Video Performance

An industry-standard method of measuring the video
distortion of components such as the EL2244C/
EL2444C is to measure the amount of differential gain
(dG) and differential phase (dP) that they introduce. To
make these measurements, a 0.286V

(40 IRE) signal is

applied to the device with 0V DC offset (0 IRE) at either
3.58MHz for NTSC or 4.43MHz for PAL. A second
measurement is then made at 0.714V DC offset (100
IRE). Differential gain is a measure of the change in
amplitude of the sine wave, and is measured in percent.
Differential phase is a measure of the change in phase,
and is measured in degrees.

For signal transmission and distribution, a back-termi-
nated cable (75

in series at the drive end, and 75

ground at the receiving end) is preferred since the
impedance match at both ends will absorb any reflec-
tions. However, when double termination is used, the
received signal is halved; therefore a gain of 2 configu-
ration is typically used to compensate for the
attenuation.

The EL2244C/EL2444C have been designed as an eco-
nomical solution for applications requiring low video
distortion. They have been thoroughly characterized for
video performance in the topology described above, and
the results have been included as typical dG and dP
specifications and as typical performance curves. In a
gain of +2, driving 150

, with standard video test levels

at the input, the EL2244C/EL2444C exhibit dG and dP
of only 0.04% and 0.15° at NTSC and PAL. Because dG
and dP can vary with different DC offsets, the video per-
formance of the EL2244C/EL2444C has been

characterized over the entire DC offset range from -
0.714V to +0.714V. For more information, refer to the
curves of dG and dP vs DC Input Offset.

Output Drive Capability

The EL2244C/EL2444C have been designed to drive
low impedance loads. They can easily drive 6V

into a

150¾ load. This high output drive capability makes the
EL2244C/EL2444C an ideal choice for RF, IF and video
applications. Furthermore, the current drive of the
EL2244C/EL2444C remains a minimum of 35 mA at
low temperatures. The EL2244C/EL2444C are current-
limited at the output, allowing it to withstand shorts to
ground. However, power dissipation with the output
shorted can be in excess of the power-dissipation capa-
bilities of the package.

Capacitive Loads

For ease of use, the EL2244C/EL2444C have been
designed to drive any capacitive load. However, the
EL2244C/EL2444C remain stable by automatically
reducing their gain-bandwidth product as capacitive
load increases. Therefore, for maximum bandwidth,
capacitive loads should be reduced as much as possible
or isolated via a series output resistor (Rs). Similarly,
coax lines can be driven, but best AC performance is
obtained when they are terminated with their character-
istic impedance so that the capacitance of the coaxial
cable will not add to the capacitive load seen by the
amplifier. Although stable with all capacitive loads,
some peaking still occurs as load capacitance increases.
A series resistor at the output of the EL2244C/EL2444C
can be used to reduce this peaking and further improve
stability.

Printed-Circuit Layout

The EL2244C/EL2444C are well behaved, and easy to
apply in most applications. However, a few simple tech-
niques will help assure rapid, high quality results. As
with any high-frequency device, good PCB layout is
necessary for optimum performance. Ground-plane con-
struction is highly recommended, as is good power
supply bypassing. A 0.1 µF ceramic capacitor is recom-
mended for bypassing both supplies. Lead lengths
should be as short as possible, and bypass capacitors
should be as close to the device pins as possible. For

EL2244C, EL2444C

Dual/Quad Low-Power 120MHz Unity-Gain Stable Op Amp

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good AC performance, parasitic capacitances should be
kept to a minimum at both inputs and at the output.
Resistor values should be kept under 5 k

because of

the RC time constants associated with the parasitic
capacitance. Metal-film and carbon resistors are both
acceptable, use of wire-wound resistors is not recom-
mended because of their parasitic inductance. Similarly,
capacitors should be low-inductance for best
performance.

The EL2244C/EL2444C Macromodel

This macromodel has been developed to assist the user
in simulating the EL2244C/EL2444C with surrounding
circuitry. It has been developed for the PSPICE simula-
tor (copywritten by the Microsim Corporation), and may
need to be rearranged for other simulators. It approxi-
mates DC, AC, and transient response for resistive
loads, but does not accurately model capacitive loading.
This model is slightly more complicated than the models
used for low-frequency op-amps, but it is much more
accurate for AC analysis.

The model does not simulate these characteristics
accurately:

noise

non-linearities

settling-time

temperature effects

CMRR

manufacturing variations

PSRR

EL2244C, EL2444C

Dual/Quad Low-Power 120MHz Unity-Gain Stable Op Amp

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EL2244C/EL2444 Macromodel

* Connections: +input
* | -input
* | | +Vsupply
* | | | -Vsupply
* | | | | output
* | | | | |
.subckt M2244 3 2 7 4 6
*
* Input stage
*
ie 7 37 1mA
r6 36 37 800
r7 38 37 800
rc1 4 30 850
rc2 4 39 850
q1 30 3 36 qp
q2 39 2 38 qpa
ediff 33 0 39 30 1.0
rdiff 33 0 1Meg
*
* Compensation Section
*
ga 0 34 33 0 1m
rh 34 0 2Meg
ch 34 0 1.3pF
rc 34 40 1K
cc 40 0 1pF
*
* Poles
*
ep 41 0 40 0 1
rpa 41 42 200
cpa 42 0 1pF
rpb 42 43 200
cpb 43 0 1pF
*
* Output Stage
*
ios1 7 50 1.0mA
ios2 51 4 1.0mA
q3 4 43 50 qp
q4 7 43 51 qn
q5 7 50 52 qn
q6 4 51 53 qp
ros1 52 6 25
ros2 6 53 25
*
* Power Supply Current
*
ips 7 4 2.7mA
*
* Models
*
.model qn npn(is=800E-18 bf=200 tf=0.2nS)
.model qpa pnp(is=864E-18 bf=100 tf=0.2nS)
.model qp pnp(is=800E-18 bf=125 tf=0.2nS)
.ends

EL2244C, EL2444C

Dual/Quad Low-Power 120MHz Unity-Gain Stable Op Amp

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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 warranty is limited to replacement of defective
components and does not cover injury to persons or property or
other consequential damages.

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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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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: EL2444C