EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
EL2045C December 1995 Rev C
Features
# 100 MHz gain-bandwidth
product
# Gain-of-2 stable
# Low supply current
e
5.2 mA at V
e
g
15V
S
# Wide supply range
e
g
2V tog18V dual-supply
e
2.5V to 36V single-supply
# High slew rate
# Fast settling
e
275 V/ms
e
80 ns to 0.1% for
a 10V step
# Low differential gain
ea
A
2, R
V
L
# Low differential phase
ea
A
2, R
V
L
e
e
150X
150X
e
0.02% at
e
0.07§at
# Stable with unlimited capacitive
load
# Wide output voltage swing
e
g
13.6V with V
e
R
1000X
L
e
3.8V/0.3V with V
e
R
500X
L
e
g
15V,
S
ea
5V,
S
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 EL2045C is a high speed, low power, low cost monolithic
operational amplifier built on Elantec’s proprietary complementary bipolar process. The EL2045C is gain-of-2 stable and
features a 275 V/ms slew rate and 100 MHz gain-bandwidth
product while requiring only 5.2 mA of supply current.
The power supply operating range of the EL2045C is from
g
18V down to as little asg2V. For single-supply operation,
the EL2045C operates from 36V down to as little as 2.5V. The
excellent power supply operating range of the EL2045C makes
it an obvious choice for applications on a single
a
5V ora3V
supply.
The EL2045C also features an extremely wide output voltage
swing of
g
13.6V with V
output voltage swing is a wide
g
3.2V with R
tion at
with R
a
L
At a gain of
e
L
5V, output voltage swing is an excellent 0.3V to 3.8V
e
500X.
a
2, the EL2045C has ab3 dB bandwidth of
e
g
15V and R
S
g
3.8V with R
150X. Furthermore, for single-supply opera-
100 MHz with a phase margin of 50
e
1000X.Atg5V,
L
. It can drive unlimited
§
L
e
500X and
load capacitance, and because of its conventional voltage-feedback topology, the EL2045C allows the use of reactive or nonlinear elements in its feedback network. This versatility combined with low cost and 75 mA of output-current drive makes
the EL2045C an ideal choice for price-sensitive applications requiring low power and high speed.
Connection Diagram
DIP and SO Package
Ordering Information
Part No. Temp. Range Package Outline
EL2045CN 0§Ctoa75§C 8-Pin P-DIP MDP0031
EL2045CS 0§Ctoa75§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.
©
1992 Elantec, Inc.
Ý
2045– 1
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Absolute Maximum Ratings
Supply Voltage (V
Peak Output Current (I
Output Short-Circuit Duration Infinite
(Note 1)
Input Voltage (V
Differential Input Voltage (dVIN)
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
equipment, specifically the LTX77 Series system. Unless otherwise noted, all tests are pulsed tests, therefore T
Test Level Test Procedure
I 100% production tested and QA sample tested per QA test plan QCX0002.
II 100% production tested at T
III QA sample tested per QA test plan QCX0002.
IV Parameter is guaranteed (but not tested) by Design and Characterization Data.
V Parameter is typical value at T
)
S
) Short-Circuit Protected
OP
IN)
T
MAX
and T
per QA test plan QCX0002.
MIN
A
DC Electrical Characteristics
e
(T
25§C)
A
g
18V or 36V
g
g
10V
e
25§C and QA sample tested at T
e
25§C for information purposes only.
A
e
V
S
Power Dissipation (P
Operating Temperature
Range (T
Operating Junction
V
g
Temperature (T
S
Storage Temperature (T
e
15V, R
L
) See Curves
D
)0
A
) 150§C
J
)
ST
J
e
25§C,
A
Ctoa75§C
§
b
65§Ctoa150§C
e
e
T
TA.
C
1000X, unless otherwise specified
Parameter Description Condition Temp Min Typ Max Test Level Units
e
V
OS
TCV
I
B
I
OS
TCI
A
VOL
OS
Input Offset V
Voltage
Average Offset (Note 2)
OS
Voltage Drift
Input Bias V
Current
Input Offset V
Current
Average Offset (Note 2)
Current Drift
Open-Loop Gain V
PSRR Power Supply V
Rejection Ratio
g
15V 25§C 0.5 7.0 I mV
S
T
MIN,TMAX
9.0 III mV
All 10.0 V mV/
e
g
15V 25§C 2.8 8.2 I mA
S
T
MIN,TMAX
e
g
V
5V 25§C 2.8 V mA
S
e
g
15V 25§C 50 300 I nA
S
T
MIN,TMAX
e
g
V
5V 25§C50 VnA
S
9.2 III mA
400 III nA
All 0.3 V nA/
e
g
15V,V
S
e
g
V
5V, V
S
e
g
V
5V, V
S
e
g
5V tog15V 25§C6585 I dB
S
OUT
OUT
OUT
e
g
e
g
e
g
10V, R
2.5V, R
2.5V, R
e
1000X 25§C 1500 3000 I V/V
L
T
MIN,TMAX
e
500X 25§C 2500 V V/V
L
e
150X 25§C 1750 V V/V
L
T
MIN,TMAX
1500 III V/V
60 III dB
C
§
C
§
TDis3.5in
2
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
DC Electrical Characteristics
e
g
V
S
15V, R
e
1000X, unless otherwise specified Ð Contd.
L
Parameter Description Condition Temp Min Typ Max Test Level Units
CMRR Common-Mode V
Rejection Ratio
CMIR Common-Mode V
Input Range
V
I
I
R
OUT
SC
S
IN
Output Voltage V
Swing
Output Short 25§C4075 ImA
Circuit Current
Supply Current V
Input Resistance Differential 25§C 150 V kX
e
g
12V, V
CM
e
g
15V 25§C
S
e
g
V
5V 25§C
S
ea
V
5V 25§C 4.2/0.1 V V
S
e
g
15V, R
S
e
g
V
15V, R
S
e
g
V
5V, R
S
e
g
V
5V, R
S
ea
V
5V, R
S
e
g
15V, No Load 25§C 5.2 7 I mA
S
e
g
V
5V, No Load 25§C 5.0 V mA
S
e
0V 25§C7095 IdB
OUT
T
MIN,TMAX
e
1000X 25§C
L
T
MIN,TMAX
e
500X 25§C
L
e
500X 25§C
L
e
150X 25§C
L
e
500X 25§C 3.6/0.4 3.8/0.3 I V
L
T
MIN,TMAX
T
MIN,TMAX
T
MIN,TMAX
70 III dB
g
14.0 V V
g
4.2 V V
g
13.4g13.6 I V
g
13.1 III V
g
12.0g13.4 I V
g
g
3.4
3.8 IV V
g
3.2 V V
3.5/0.5 III V
35 III mA
7.6 III mA
Common-Mode 25§C15VMX
CINInput Capacitance A
R
OUT
Output Resistance A
PSOR Power-Supply Dual-Supply 25§C
Operating Range
ea
2@10 MHz 25§C 1.0 V pF
V
ea
225
V
Single-Supply 25
C50VmX
§
g
2.0
C 2.5 36.0 V V
§
g
18.0 V V
TDis4.5inTDis1.9in
Closed-Loop AC Electrical Characteristics
e
g
V
S
Parameter Description Condition Temp Min Typ Max Test Level Units
BW
GBWP Gain-Bandwidth Product V
PM Phase Margin R
15V, A
V
ea
b
(V
e
2, R
e
R
f
g
3 dB Bandwidth V
e
0.4 VPP)
OUT
1kX,C
f
e
S
V
S
V
S
V
S
V
S
V
S
S
V
S
L
e
3 pF, R
e
e
e
e
e
e
e
e
e
1000X unless otherwise specified
L
g
g
g
g
g
g
g
g
1kX,C
ea
15V, A
15V, A
15V, A
15V, A
15V, A
5V, A
225
V
eb
125
V
ea
525
V
ea
10 25§C 10 V MHz
V
ea
20 25§C 5 V MHz
V
ea
225
V
C 100 V MHz
§
C 75 V MHz
§
C 20 V MHz
§
C 75 V MHz
§
15V 25§C 100 V MHz
5V 25§C 75 V MHz
e
10 pF 25§C50 V
L
3
§
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Closed-Loop AC Electrical Characteristics
e
g
V
S
Parameter Description Condition Temp Min Typ Max Test Level Units
SR Slew Rate (Note 3) V
FPBW Full-Power Bandwidth V
tr,t
f
OS Overshoot 0.1V Output Step 25§C20 V%
tPDPropagation Delay 25§C 2.5 V ns
t
s
dG Differential Gain (Note 5) NTSC/PAL 25§C 0.02 V %
dP Differential Phase (Note 5) NTSC/PAL 25§C 0.07 V
eN Input Noise Voltage 10 kHz 25§C 15.0 V nV/0Hz
iN Input Noise Current 10 kHz 25§C 1.50 V pA/0Hz
CI STAB Load Capacitance Stability A
Note 1: A heat-sink is required to keep junction temperature below absolute maximum when an output is shorted.
Note 2: Measured from T
Note 3: Slew rate is measured on rising edge.
Note 4: For V
Note 5: Video Performance measured at V
15V, A
ea
V
(Note 4)
2, R
e
e
R
f
g
1kX,C
f
e
S
V
S
S
V
S
e
3 pF, R
e
e
e
e
1000X, unless otherwise specified Ð Contd.
L
g
g
g
g
e
15V, R
5V, R
1000X 25§C 200 275 I V/ms
L
e
500X 25§C 200 V V/ms
L
15V 25§C 3.2 4.4 I MHz
5V 25§C 12.7 V MHz
Rise Time, Fall Time 0.1V Output Step 25§C 3.0 V ns
e
Settling toa0.1% V
ea
(A
S
measurement using: FPBW
2)
V
to T
MIN
e
g
15V, V
OUT
.
MAX
e
20 VPP. For V
e
SR/(2q * Vpeak).
corresponds to standard video levels across a back-terminated 75X load. For other values of R
g
15V, 10V Step 25§C80 Vns
S
e
g
V
5V, 5V Step 25§C60 Vns
S
ea
225
V
e
g
5V, V
S
e
g
15V, A
S
OUT
ea
2 with 2 times normal video level across R
V
C Infinite V pF
§
e
5VPP. Full-power bandwidth is based on slew rate
, see curves.
L
EL2045C Test Circuit
e
L
§
150X. This
TDis2.8in
2045– 2
4
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Typical Performance Curves
e
(T
A
e
25§C, R
Non-Inverting
Frequency Response
f
1kX,C
f
e
3 pF, R
e
L
1000X,A
ea
2 unless otherwise specified)
V
Inverting Frequency Response Various Load Resistances
Frequency Response for
Open-Loop Gain and
Phase vs Frequency
CMRR, PSRR and Closed-Loop
Output Resistance vs Frequency
Supply Current vs
Supply Voltage
Output Voltage Swing
vs Frequency
2nd and 3rd Harmonic
Distortion vs Frequency
Common-Mode Input Range
vs Supply Voltage
Equivalent Input Noise
Settling Time vs
Output Voltage Change
Output Voltage Range
vs Supply Voltage
2045– 3
5
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Typical Performance Curves
e
(T
A
e
25§C, R
1kX,C
f
Gain-Bandwidth Product
vs Supply Voltage
f
e
3 pF, R
e
L
1000X,A
ea
2 unless otherwise specified) Ð Contd.
V
Open-Loop Gain
vs Supply Voltage
Slew-Rate vs
Supply Voltage
Bias and Offset Current
vs Input Common-Mode Voltage
Offset Voltage
vs Temperature
Gain-Bandwidth Product
vs Temperature
Open-Loop Gain
vs Load Resistance
Bias and Offset
Current vs Temperature
Open-Loop Gain PSRR
and CMRR vs Temperature
Voltage Swing
vs Load Resistance
Supply Current
vs Temperature
Slew Rate vs
Temperature
2045– 4
6
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Typical Performance Curves
e
(T
A
e
25§C, R
Short-Circuit Current
vs Temperature
f
1kX,C
f
e
3 pF, R
e
L
1000X,A
ea
2 unless otherwise specified) Ð Contd.
V
Gain-Bandwidth Product
vs Load Capacitance
Overshoot vs
Load Capacitance
Small-Signal
Step Response
Differential Gain and
Phase vs DC Input
Offset at 3.58 MHz
Differential Gain and
Phase vs Number of
150X Loads at 4.43 MHz
Large-Signal
Step Response
2045– 6
Differential Gain and
Phase vs DC Input
Offset at 4.43 MHz
8-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
2045– 5
2045– 7
Differential Gain and
Phase vs Number of
150X Loads at 3.58 MHz
8-Lead SO
Maximum Power Dissipation
vs Ambient Temperature
2045– 8
7
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Simplified Schematic
2045– 9
8
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Burn-In Circuit
All Packages Use the Same Schematic
2045– 10
Applications Information
Product Description
The EL2045C is a low-power wideband, gain-of-2
stable monolithic operational amplifier built on
Elantec’s proprietary high-speed complementary
bipolar process. The EL2045C 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 EL2045C 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 EL2045C is an excellent choice
for applications such as fast log amplifiers.
Single-Supply Operation
The EL2045C has been designed to have a wide
input and output voltage range. This design also
makes the EL2045C an excellent choice for single-supply operation. Using a single positive supply, the lower input voltage range is within
100 mV of ground (R
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
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 EL2045C still
has 1V of output swing.
e
500X. This results in a 3.5V output
L
e
500X), and the lower
L
Gain-Bandwidth Product and theb3dB
Bandwidth
The EL2045C has a gain-bandwidth product of
100 MHz while using only 5.2 mA of supply current. For gains greater than 4, its closed-loop
b
3 dB bandwidth is approximately equal to the
gain-bandwidth product divided by the noise
gain of the circuit. For gains less than 4, higherorder poles in the amplifier’s transfer function
contribute to even higher closed loop bandwidths. For example, the EL2045C has a
bandwidth of 100 MHz at a gain of
to 20 MHz at a gain of
note that the EL2045C 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 EL2045C
in a gain of
with a 1000X load.
a
2 only exhibits 1.0 dB of peaking
a
5. It is important to
b
a
2, dropping
3dB
Video Performance
An industry-standard method of measuring the
video distortion of a component such as the
EL2045C is to measure the amount of differential
gain (dG) and differential phase (dP) that it introduces. To make these measurements, a
0.286 V
with 0V DC offset (0 IRE) at either 3.58 MHz for
NTSC or 4.43 MHz 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 backterminated cable (75X in series at the drive end,
and 75X 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 EL2045C has been designed as an economical solution for applications requiring low video
distortion. It has been thoroughly characterized
(40 IRE) signal is applied to the device
PP
9
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Applications Information
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
with standard video test levels at the input, the
EL2045C exhibits dG and dP of only 0.02% and
0.07
at NTSC and PAL. Because dG and dP can
§
vary with different DC offsets, the video performance of the EL2045C has been characterized
over the entire DC offset range from
a
0.714V. For more information, refer to the
curves of dG and dP vs DC Input Offset.
The output drive capability of the EL2045C 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 EL2120, EL400, or EL2074 should be
considered.
Ð Contd.
a
2, driving 150X,
b
0.714V to
Output Drive Capability
The EL2045C has been designed to drive low impedance loads. It can easily drive 6 V
150X load. This high output drive capability
makes the EL2045C an ideal choice for RF, IF
and video applications. Furthermore, the current
drive of the EL2045C remains a minimum of
35 mA at low temperatures. The EL2045C 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.
PP
into a
Capacitive Loads
For ease of use, the EL2045C has been designed
to drive any capacitive load. However, the
EL2045C 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. Al-
though stable with all capacitive loads, some
peaking still occurs as load capacitance increases.
A series resistor at the output of the EL2045C
can be used to reduce this peaking and further
improve stability.
Printed-Circuit Layout
The EL2045C 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 high-frequency device, good PCB
layout is necessary for optimum performance.
Ground-plane construction is highly recommended, as is good power supply bypassing. A 0.1 mF
ceramic capacitor is recommended 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 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 kX 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 recommended because of their
parasitic inductance. Similarly, capacitors should
be low-inductance for best performance.
The EL2045C Macromodel
This macromodel has been developed to assist
the user in simulating the EL2045C 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 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
10
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
EL2045C Macromodel
* Connections:
*
*
*
*
*
.subckt M2045 3 2746
*
*Input stage
*
ie 7 37 0.9mA
r6 36 37 400
r7 38 37 400
rc1 4 30 850
rc2 4 39 850
q130336qp
q2 39 2 38 qpa
ediff 33 0 39 30 1.0
rdiff 33 0 1Meg
*
* Compensation Section
*
ga0343301m
rh 34 0 2Meg
ch 34 0 1.5pF
rc 34 40 1K
cc 40 0 1pF
*
* Poles
*
ep4104001
rpa 41 42 200
cpa 42 0 2pF
rpb 42 43 200
cpb 43 0 2pF
*
* Output Stage
*
ios1 7 50 1.0mA
ios2 51 4 1.0mA
q344350qp
q474351qn
q575052qn
q645153qp
ros1 52 6 25
ros265325
*
*Power Supply Current
*
ips 7 4 2.7mA
*
a
input * Models
b
input
l
ll
a
lll
llll
lllll
Vsupply
b
Ð Contd.
Vsupply
output
*
.model qn npn(is
.model qpa pnp(is
.model qp pnp(is
.ends
e
800Eb18 bfe200 tfe0.2nS)
e
864Eb18 bfe100 tfe0.2nS)
e
800Eb18 bfe125 tfe0.2nS)
TABWIDE
TDis0.7in TDis0.7in
11
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
EL2045CDecember 1995 Rev C
EL2045C Macromodel
Ð Contd.
EL2045C Model
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.
2045– 11
Printed in U.S.A.12
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