EL2044C
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
EL2044C
Features
• 120MHz -3dB bandwidth
• Unity-gain stable
• Low supply current
= 5.2mA at VS = ±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
AV=+2, R
= 150Ω
L
• Low differential phase = 0.15° at
AV = +2, R
= 150Ω
L
• Stable with unlimited capacitive
load
• Wide output voltage swing
= ±13.6V with VS = ±15V,
R
= 1000Ω
L
= 3.8V/0.3V with VS = +5V,
R
= 500Ω
L
• Low cost, enhanced replacement
for the AD847 and LM6361
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
General Description
The EL2044C is a high speed, low power, low cost monolithic operational amplifier built on Elantec's proprietary complementary bipolar
process. The EL2044C is unity-gain stable and features a 325V/µs
slew rate and 120MHz gain-bandwidth product while requiring only
5.2 mA of supply current.
The power supply operating range of the EL2044C is from ±18V
down to as little as ±2V. For single-supply operation, the EL2044C
operates from 36V down to as little as 2.5V. The excellent power supply operating range of the EL2044C makes it an obvious choice for
applications on a single +5V supply.
The EL2044C also features an extremely wide output voltage swing of
±13.6V with VS = ±15V and R
swing is a wide ±3.8V with R
= 1000Ω. At ±5V, output voltage
L
= 500Ω and ±3.2V with RL = 150Ω.
L
Furthermore, for single-supply operation at +5V, output voltage swing
is an excellent 0.3V to 3.8V with R
= 500Ω.
L
At a gain of +1, the EL2044C has a -3dB bandwidth of 120MHz with
a phase margin of 50°. It can drive unlimited load capacitance, and
because of its conventional voltage-feedback topology, the EL2044C
allows the use of reactive or non-linear elements in its feedback network. This versatility combined with low cost and 75mA of outputcurrent drive makes the EL2044C an ideal choice for price-sensitive
applications requiring low power and high speed.
Connection Diagram
DIP and SO Package
September 26, 2001
Ordering Information
Part No. Temp. Range Package Outline #
EL2044CN -40°C to +85°C 8-Pin P-DIP MDP0031
EL2044CS -40°C to +85°C 8-Lead SO 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.
© 2001 Elantec Semiconductor, Inc.
EL2044C
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
EL2044C
Absolute Maximum Ratings (T
Supply Voltage (VS) ±18V or 36V
Peak Output Current (IOP) 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
Differential Input Voltage (dVIN) ±10V
IN)
= 25°C)
A
Power Dissipation (PD) See Curves
Operating Temperature
Range (TA) -40°C to +85°C
Operating Junction
Temperature (TJ) 150°C
±V
S
Storage Temperature (TST) -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: TJ = TC = TA.
DC Electrical Characteristics
VS = ±15V, R
Parameter Description Condition Temp Min Typ Max Unit
V
OS
TCV
I
B
I
OS
TCI
A
VOL
PSRR Power Supply
CMRR Common-Mode
CMIR Common-Mode
V
OUT
I
SC
= 1000Ω, unless otherwise specified
L
Input Offset
Voltage
OS
Average Offset (Note 2) All 10.0 µV/°C
Voltage Drift
Input Bias
Current
Input Offset
Current
OS
Average Offset
Current Drift
Open-Loop Gain VS = ±15V,V
Rejection Ratio
Rejection Ratio
Input Range
Output Voltage
Swing
Output Short
Circuit Current
VS = ±15V 25°C 0.5 7.0 mV
T
MIN
, T
MAX
13.0 mV
VS = ±15V 25°C 2.8 8.2 µA
T
MIN
, T
MAX
11.2 µA
VS = ±5V 25°C 2.8 µA
VS = ±15V 25°C 50 300 nA
T
, T
MIN
VS = ±5V 25°C 50 nA
[1]
VS = ±5V, V
VS = ±5V, V
= ±10V, R
OUT
= ±2.5V, R
OUT
= ±2.5V, R
OUT
= 1000Ω 25°C 800 1500 V/V
L
= 500Ω 25°C 1200 V/V
L
= 150Ω 25°C 1000 V/V
L
MAX
All 0.3 nA/°C
T
MIN
, T
MAX
600 V/V
500 nA
VS = ±5V to ±15V 25°C 65 80 dB
T
VCM = ±12V, V
, T
MIN
= 0V 25°C 70 90 dB
OUT
MAX
T
, T
MIN
MAX
60 dB
70 dB
VS = ±15V 25°C ±14.0 V
VS = ±5V 25°C ±4.2 V
VS = +5V 25°C 4.2/0.1 V
VS = ±15V, R
VS = ±15V, R
VS = ±5V, R
VS = ±5V, R
VS = +5V, R
= 1000Ω 25°C ±13.4 ±13.6 V
L
= 500Ω 25°C ±12.0 ±13.4 V
L
= 500Ω 25°C ±3.4 ±3.8 V
L
= 150Ω 25°C ±3.2 V
L
= 500Ω 25°C 3.6/0.4 3.8/0.3 V
L
T
, T
MIN
MAX
T
, T
MIN
MAX
±13.1 V
3.5/0.5 V
25°C 40 75 mA
T
MIN
, T
MAX
35 mA
2
EL2044C
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
DC Electrical Characteristics (Continued)
VS = ±15V, R
Parameter Description Condition Temp Min Typ Max Unit
I
S
R
IN
C
IN
R
OUT
PSOR Power-Supply
1. Measured from T
= 1000Ω, unless otherwise specified
L
Supply Current VS = ±15V, No Load 25°C 5.2 7 mA
T
, T
MIN
VS = ±5V, No Load 25°C 5.0 mA
Input Resistance Differential 25°C 150 kΩ
Common-Mode 25°C 15 MΩ
Input Capacitance AV = +1@ 10MHz 25°C 1.0 pF
Output Resistance A
Operating Range
to T
MAX
.
MIN
= +1 25°C 50 mΩ
V
Dual-Supply 25°C ±2.0 ±18.0 V
Single-Supply 25°C 2.5 36.0 V
MAX
7.6 mA
EL2044C
3
EL2044C
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
EL2044C
Closed-Loop AC Electrical Characteristics
VS = ±15V, AV = +1, RL = 1000¾ unless otherwise specified
Parameter Description Condition Temp Min Typ Max Unit
BW -3 dB Bandwidth
GBWP Gain-Bandwidth Product VS = ±15V 25°C 60 MHz
PM Phase Margin R
SR Slew Rate
FPBW Full-Power Bandwidth
tr, t
f
OS Overshoot 0.1V Step 25°C 20 %
t
PD
t
s
dG Differential Gain
dP Differential Phase (Note 5) NTSC/PAL 25°C 0.15 °
eN Input Noise Voltage 10kHz 25°C 15.0 nV/√Hz
iN Input Noise Current 10kHz 25°C 1.50 pA/√Hz
CI STAB Load Capacitance Stability AV = +1 25°C Infinite pF
1. Slew rate is measured on rising edge.
2. For VS = ±15V, V
3. Video Performance measured at VS = ±15V, AV = +2 with 2 times normal video level across R
(V
= 0.4 VPP)
OUT
[1]
[2]
Rise Time, Fall Time 0.1V Step 25°C 3.0 ns
Propagation Delay 25°C 2.5 ns
Settling to +0.1%
(AV = +1)
Vpeak).
across a back-terminated 75Ω load. For other values of R
[3]
= 20VPP. For VS = ±5V, V
OUT
VS = ±15V, AV = +1 25°C 120 MHz
VS = ±15V, AV = -1 25°C 60 MHz
VS = ±15V, AV = +2 25°C 60 MHz
VS = ±15V, AV = +5 25°C 12 MHz
VS = ±15V, AV = +10 25°C 6 MHz
VS = ±5V, AV = +1 25°C 80 MHz
VS = ±5V 25°C 45 MHz
= 1 kΩ, C
L
VS = ±15V, R
VS = ±5V, R
VS = ±15V 25°C 4.0 5.2 MHz
VS = ±5V 25°C 12.7 MHz
VS = ±15V, 10V Step 25°C 80 ns
VS = ±5V, 5V Step 60 ns
NTSC/PAL 25°C 0.04 %
= 5V
OUT
= 10 pF 25°C 50 °
L
= 1000Ω 25°C 250 325 V/µs
L
= 500Ω 25°C 200 V/µs
L
. Full-power bandwidth is based on slew rate measurement using: FPBW = SR/(2π *
PP
= 150Ω. This corresponds to standard video levels
, see curves.
L
L
4
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
Typical Performance Curves
EL2044C
EL2044C
Non-Inverting
Frequency Response
Open-Loop Gain and
Phase vs Frequency
CMRR, PSRR and Closed-Loop
Output Resistance vs Frequency
Inverting Frequency Response Frequency Response for
Output Voltage Swing
vs Frequency
2nd and 3rd Harmonic
Distortion vs Frequency
Various Load Resistances
Equivalent Input Noise
Settling Time vs
Output Voltage Change
Supply Current vs
Supply Voltage
Common-Mode Input Range vs
Supply Voltage
5
Output Voltage Range
vs Supply Voltage
EL2044C
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
EL2044C
Gain-Bandwidth Product
vs Supply Voltage
Bias and Offset Current
vs Input Common-Mode
Voltage
Offset Voltage
vs Temperature
Open-Loop Gain
vs Supply Voltage
Open-Loop Gain
vs Load Resistance
Bias and Offset
Current vs Temperature
Slew-Rate vs
Supply Voltage
Voltage Swing
vs Load Resistance
Supply Current
vs Temperature
Gain-Bandwidth Product
vs Temperature
Open-Loop Gain PSRR
and CMRR vs Temperature
6
Slew Rate vs
Temperature
EL2044C
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
EL2044C
Short-Circuit Current
vs Temperature
Differential Gain and
Phase vs DC Input
Offset at 3.58MHz
Small-Signal
Step Response
Gain-Bandwidth Product
vs Load Capacitance
Differential Gain and
Phase vs DC Input
Offset at 4.43MHz
Short-Circuit Current
Large-Signal
Overshoot vs
Load Capacitance
Differential Gain and
Phase vs Number of
150Ω Loads at 3.58MHz
Differential Gain and
Phase vs Number of
150Ω Loads at 4.43MHz
8-Pin Plastic DIP Maximum
Power Dissipation vs Ambient
Temperature
7
8-Lead SO Maximum Power
Dissipation vs Ambient
Temperature
EL2044C
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
EL2044C
Simplified Schematic
Burn-In Circuit
All Packages Use the Same Schematic
8
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
Applications Information
EL2044C
EL2044C
Product Description
The EL2044C is a low-power wideband monolithic
operational amplifier built on Elantec's proprietary highspeed complementary bipolar process. The EL2044C
uses a classical voltage-feedback topology which allows
it to be used in a variety of applications where currentfeedback amplifiers are not appropriate because of
restrictions placed upon the feedback element used with
the amplifier. The conventional topology of the
EL2044C allows, for example, 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. Similarly, because of the ability to use
diodes in the feedback network, the EL2044C is an
excellent choice for applications such as fast log
amplifiers.
Single-Supply Operation
The EL2044C has been designed to have a wide input
and output voltage range. This design also makes the
EL2044C an excellent choice for single-supply operation. Using a single positive supply, the lower input
voltage range is within 100mV of ground (R
and the lower output voltage range is within 300mV of
ground. Upper input voltage range reaches 4.2V, and
output voltage range reaches 3.8V with a 5V supply and
R
= 500Ω. This results in a 3.5V output swing on a sin-
L
gle 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 EL2044C still has 1V of output swing.
= 500Ω),
L
Gain-Bandwidth Product and the -3dB
Bandwidth
The EL2044C has a gain-bandwidth product of 60MHz
while using only 5.2mA of supply current. For gains
greater than 4, its closed-loop -3dB bandwidth is
approximately equal to the gain-bandwidth product
divided by the noise gain of the circuit. For gains less
than 4, higher-order poles in the amplifier's transfer
function contribute to even higher closed loop bandwidths. For example, the EL2044C has 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
EL2044C has 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 EL2044C in a gain of +1 only exhibits 1.0dB
of peaking with a 1000Ω load.
Video Performance
An industry-standard method of measuring the video
distortion of a component such as the EL2044C is to
measure the amount of differential gain (dG) and differential phase (dP) that it introduces. To make these
measurements, a 0.286VPP (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 (75Ω in series at the drive end, and 75Ω to
ground at the receiving end) is preferred since the
impedance match at both ends will absorb any reflections. However, when double termination is used, the
received signal is halved; therefore a gain of 2 configuration is typically used to compensate for the
attenuation.
The EL2044C has been designed as an economical solution for applications requiring low video distortion. It
has 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 150¾, with standard video test levels at the input, the
EL2044C exhibits 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 performance of the
EL2044C 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.
9
EL2044C
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
EL2044C
The output drive capability of the EL2044C allows it to
drive up to 2 back-terminated loads with good video performance. For more demanding applications such as
greater output drive or better video distortion, a number
of alternatives such as the EL2120C, EL400C, or
EL2073C should be considered.
Output Drive Capability
The EL2044C has been designed to drive low impedance loads. It can easily drive 6V
This high output drive capability makes the EL2044C an
ideal choice for RF, IF and video applications. Furthermore, the current drive of the EL2044C remains a
minimum of 35mA at low temperatures. The EL2044C
is 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
capabilities of the package.
into a 150Ω load.
PP
Capacitive Loads
For ease of use, the EL2044C has been designed to drive
any capacitive load. However, the EL2044C remains
stable by automatically reducing its 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 characteristic 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 EL2044C
can be used to reduce this peaking and further improve
stability.
the device pins as possible. For good AC performance,
parasitic capacitances should be kept to a minimum at
both inputs and at the output. Resistor values should be
kept under 5kΩ because of the RC time constants associ-
ated with the parasitic capacitance. Metal-film and
carbon resistors are both acceptable, use of wire-wound
resistors is not recommended because of their parasitic
inductance. Similarly, capacitors should be low-inductance for best performance.
The EL2044C Macromodel
This macromodel has been developed to assist the user
in simulating the EL2044C with surrounding circuitry. It
has been developed for the PSPICE simulator (copywritten by the Microsim Corporation), and may need to be
rearranged for other simulators. It approximates 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 lowfrequency 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
PSRR
manufacturing variations
Printed-Circuit Layout
The EL2044C is well behaved, and easy to apply in most
applications. However, a few simple techniques will
help assure rapid, high quality results. As with any highfrequency device, good PCB layout is necessary for
optimum performance. Ground-plane construction is
highly recommended, as is good power supply bypassing. A 0.1µF ceramic capacitor is recommended for
bypassing both supplies. Lead lengths should be as short
as possible, and bypass capacitors should be as close to
10
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
EL2044C Macromodel
IN+IN+IN+IN+IN+IN+NININININ
* Connections: +input
* | -input
* | | +Vsupply
* | | | -Vsupply
* | | | | output
* | | | | |
.subckt M2044 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
*
IN+IN+IN+IN+IN+IN+NININININ
* 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
EL2044C
EL2044C
11
EL2044C
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
EL2044C
EL2044C Macromodel
12
EL2044C
Low Power/Low Voltage 120MHz Unity-Gain Stable Operational Amplifier
EL2044C
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 - 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-
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
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 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.
September 26, 2001
13
Printed in U.S.A.
Loading...