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.
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
General Description
The EL2250C/EL2450C are part of a family of the electronics indus-
tries fastest single supply op amps available. Prior single supply op
amps have generally been limited to bandwidths and slew rates to that
of the EL2250C/EL2450C. The 125MHz bandwidth, 275V/s slew
rate, and 0.05%/0.05 differential gain/differential phase makes this
part ideal for single or dual supply video speed applications. With its
voltage feedback architecture, this amplifier can accept reactive feed-
back networks, allowing them to be used in analog filtering
applications. The inputs can sense signals below the bottom supply
rail and as high as 1.2V below the top rail. Connecting the load resistor
to ground and operating from a single supply, the outputs swing com-
pletely to ground without saturating. The outputs can also drive to
within 1.2V of the top rail. The EL2250C/EL2450C will output
100mA and will operate with single supply voltages as low as 2.7V,
making them ideal for portable, low power applications.
The EL2250C/EL2450C are available in PDIP and SO packages in
industry standard pin outs. Both parts operate over the industrial tem-
perature range of -40C to +85C, and are part of a family of single
supply op amps. For single amplifier applications, see the
EL2150C/EL2157C. For dual and triple amplifiers with power down
and output voltage clamps, see the EL2257C/EL2357C.
Connection Diagrams
1
2
3
4
8
7
6
5
1
2
3
4
14
13
12
11
5
6
7
10
9
8
EL2250C
(8-Pin SO & 8-Pin PDIP)
EL2450C
(14-Pin SO & 14-Pin PDIP)
-
+
-
+
A
B
OUTA
INA-
INA+
GND
VS+
OUTB
INB-
INB+
OUTA
INA-
INA+
VS+
OUTD
IND-
IND+
GND
INB+
INB-
OUTB
INC+
INC-
OUTC
- +
-
+
- +
-
+
B
C
A
D
Features
Specified for +3V, +5V, or 5V
applications
Large input common mode range
0V < V
CM
< V
S
-1.2V
Output swings to ground without
saturating
-3dB bandwidth = 125MHz
0.1dB bandwidth = 30MHz
Low supply current = 5mA (per
amplifier)
Slew rate = 275V/s
Low offset voltage = 4mV max
Output current = 100mA
High open loop gain = 80dB
Differential gain = 0.05%
Differential phase = 0.05
Applications
Video amplifiers
PCMCIA applications
A/D drivers
Line drivers
Portable computers
High speed communications
RGB printers, FAX, scanners
Broadcast equipment
Active filtering
Ordering Information
Part No
Package
Tape & Reel
Outline #
EL2250CN
8-Pin PDIP
-
MDP0031
EL2250CS
8-Pin SO
-
MDP0027
EL2250CS-T7
8-Pin SO
7"
MDP0027
EL2250CS-T13
8-Pin SO
13"
MDP0027
EL2450CN
14-Pin PDIP
-
MDP0031
EL2450CS
14-Pin SO
-
MDP0027
EL2450CS-T7
14-Pin SO
7"
MDP0027
EL2450CS-T13
14-Pin SO
13"
MDP0027
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
S
e
p
t
e
m
b
e
r
2
6
,
2
0
0
1
2
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
Absolute Maximum Ratings
(T
A
= 25C)
Supply Voltage between V
S
and GND
+12.6V
Input Voltage (IN+, IN-)
GND-0.3V,V
S
+0.3V
Differential Input Voltage
6V
Maximum Output Current
90mA
Output Short Circuit Duration
(Note 1)
Power Dissipation
See Curves
Storage Temperature Range
-65C to +150C
Ambient Operating Temperature Range
-40C to +85C
Operating Junction Temperature
150C
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
J
= T
C
= T
A
.
DC Electrical Characteristics
V
S
= +5V, GND = 0V, T
A
= 25C, V
CM
= 1.5V, V
OUT
= 1.5V, unless otherwise specified.
Parameter
Description
Test Conditions
Min
Typ
Max
Unit
V
OS
Offset Voltage
EL2250C
-2
2
mV
EL2450C
-4
4
mV
TCV
OS
Offset Voltage Temperature Coefficient
Measured from T
MIN
to T
MAX
10
V/C
IB
Input Bias Current
V
IN
= 0V
-5.5
-10
A
I
OS
Input Offset Current
V
IN
= 0V
-750
150
750
nA
TCI
OS
Input Bias Current Temperature Coefficient
Measured from T
MIN
to T
MAX
50
nA/C
PSRR
Power Supply Rejection Ratio
V
S
= +2.7V to +12V
55
70
dB
CMRR
Common Mode Rejection Ratio
VCM = 0V to +3.8V
55
65
dB
VCM = 0V to +3.0V
55
70
dB
CMIR
Common Mode Input Range
0
V
S
-1.2
V
R
IN
Input Resistance
Common Mode
1
2
M
C
IN
Input Capacitance
SO Package
1
pF
PDIP Package
1.5
pF
R
OUT
Output Resistance
A
V
= +1
40
m
I
S
Supply Current (per amplifier)
V
S
= +12V
5
6.5
mA
PSOR
Power Supply Operating Range
2.7
12.0
V
DC Electrical Characteristics
V
S
= +5V, GND = 0V, T
A
= 25C, V
CM
= +1.5V, V
OUT
= +1.5V, unless otherwise specified.
Parameter
Description
Test Conditions
Min
Typ
Max
Unit
AVOL
Open Loop Gain
V
S
= +12V, V
OUT
= +2V to +9V, R
L
= 1k
to GND
60
80
dB
V
OUT
= +1.5V to +3.5V, R
L
= 1k
to GND
70
dB
V
OUT
= +1.5V to +3.5V, R
L
= 150
to
GND
60
dB
V
OP
Positive Output
Voltage Swing
V
S
= +12V, A
V
= +1, R
L
= 1k
to 0V
10.8
V
V
S
= +12V, A
V
= +1, R
L
= 150
to 0V
9.6
10.0
V
V
S
= 5V, A
V
= +1, R
L
= 1k
to 0V
4.0
V
V
S
= 5V, A
V
= +1, R
L
= 150
to 0V
3.4
3.8
V
V
S
= +3V, A
V
= +1, R
L
= 150
to 0V
1.8
1.95
V
3
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
V
ON
Negative Output
Voltage Swing
V
S
= +12V, A
V
= +1, R
L
= 150
to 0V
5.5
8
mV
V
S
= 5V, A
V
= +1, R
L
= 1k
to 0V
-4.0
V
V
S
= 5V, A
V
= +1, R
L
= 150
to 0V
-3.7
-3.4
V
I
OUT
Output Current
[1]
V
S
= 5V, A
V
= +1, R
L
= 10
to 0V
75
100
mA
V
S
= 5V, A
V
= +1, R
L
= 50
to 0V60V
mA
1. Internal short circuit protection circuitry has been built into the EL2250C/EL2450C; see the Applications section
DC Electrical Characteristics
V
S
= +5V, GND = 0V, T
A
= 25C, V
CM
= +1.5V, V
OUT
= +1.5V, unless otherwise specified.
Parameter
Description
Test Conditions
Min
Typ
Max
Unit
Closed Loop AC Electrical Characteristics
V
S
= +5V, GND = 0V, T
A
= 25C, V
CM
= +1.5V, V
OUT
= +1.5V, A
V
= +1, R
F
= 0
, R
L
= 150
to GND pin, unless otherwise specified.
[1]
Parameter
Description
Test Conditions
Min
Typ
Max
Unit
BW
-3dB Bandwidth
(V
OUT
=400mVp-p)
V
S
= +5V, A
V
= +1, R
F
= 0
125
MHz
V
S
= +5V, A
V
= -1, R
F
= 500
60
MHz
V
S
= +5V, A
V
= +2, R
F
= 500
60
MHz
V
S
= +5V, A
V
= +10, R
F
= 500
6
MHz
V
S
= +12V, A
V
= +1, R
F
= 0
150
MHz
V
S
= +3V, A
V
= +1, R
F
= 0
100
MHz
BW
0.1dB Bandwidth
(V
OUT
=400mVp-p)
V
S
= +12V, A
V
= +1, R
F
= 0
25
MHz
V
S
= +5V, A
V
= +1, R
F
= 0
30
MHz
V
S
= +3V, A
V
= +1, R
F
= 0
20
MHz
GBWP
Gain Bandwidth Product
V
S
= +12V, @ A
V
= +10
60
MHz
PM
Phase Margin
R
L
= 1k
, C
L
= 6pF
55
SR
Slew Rate
V
S
= +10V, R
L
= 150
, V
OUT
= 0V to +6V
200
275
V/s
V
S
= +5V, R
L
= 150
, V
OUT
= 0V to +3V
300
V/s
t
R
, t
F
Rise Time, Fall Time
0.1V Step
2.8
ns
OS
Overshoot
0.1V Step
10
%
t
PD
Propagation Delay
0.1V Step
3.2
ns
t
S
0.1% Settling Time
V
S
= 5V, R
L
= 500
, A
V
= +1, V
OUT
=
3V
40
ns
0.01% Settling Time
V
S
= 5V, R
L
= 500
, A
V
= +1, V
OUT
=
3V
75
ns
dG
Differential Gain
[2]
A
V
= +2, R
F
= 1k
0.05
%
dP
Differential Phase
[2]
A
V
= +2, R
F
= 1k
0.05
e
N
Input Noise Voltage
f = 10kHz
48
nV/
Hz
i
N
Input Noise Current
f = 10kHz
1.25
pA/
Hz
1. All AC tests are performed on a "warmed up" part, except slew rate, which is pulse tested
2. Standard NTSC signal = 286mV
P-P
, f = 3.58MHz, as V
IN
is swept from 0.6V to 1.314V; R
L
is DC coupled
4
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
Typical Performance Curves
Non-Inverting Frequency Response
(Gain)
Non-Inverting Frequency Response
(Phase)
3dB Bandwidth vs Temperature for Non-
Inverting Gains
3dB Bandwidth vs Temperature for
Inverting Gains
Inverting Frequency Response (Phase)
Inverting Frequency Response (Gain)
Frequency Response for Various R
L
Frequency Response for Various C
L
Non-Inverting Frequency Response vs
Common Mode Voltage
5
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
3dB Bandwidth vs Supply Voltage for
Non-Inverting Gains
Frequency Response for Various Supply
Voltages, A
V
= + 1
PSSR and CMRR vs Frequency
PSRR and CMRR vs Die Temperature
Frequency Response for Various Supply
Voltages, A
V
= + 2
3dB Bandwidth vs Supply Voltage for
Inverting Gains
Open Loop Gain and Phase vs Frequency
Open Loop Voltage Gain vs Die
Temperature
Closed Loop Output Impedance vs
Frequency
6
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
Large Signal Step Response, V
S
= +3V
Large Signal Step Response, V
S
= +5V
Large Signal Step Response, V
S
= +12V
Small Signal Step Response
Large Signal Step Response, V
S
= 5V
Slew Rate vs Temperature
Settling Time vs Settling Accuracy
Voltage and Current Noise vs Frequency
7
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
Differential Gain for
Single Supply Operation
Differential Phase for
Single Supply Operation
Differential Gain and Phase
for Dual Supply Operation
2nd and 3rd Harmonic Distortion vs
Frequency
2nd and 3rd Harmonic Distortion vs
Frequency
2nd and 3rd Harmonic Distortion vs
Frequency
Output Voltage Swing vs Frequency for
THD < 0.1%
Output Voltage Swing vs Frequency for
Unlimited Distortion
Output Current vs Die Temperature
8
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
Supply Current vs Supply Voltage (per
amplifier)
Supply Current vs Die Temperature (per
amplifier)
Input Resistance vs Die Temperature
Offset Voltage vs Die Temperature (4
Samples)
Input Bias Current vs Input Voltage
Input Offset Current and Input Bias
Current vs Die Temperature
Positive Output Voltage Swing vs Die
Temperature, R
L
= 150
to GND
Negative Output Voltage Swing vs Die
Temperature, R
L
= 150
to GND
Channel to Channel Isolation vs
Frequency
9
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
Simplified Schematic
Package Power Dissipation vs Ambient Temp.
SEMI G42-88 Single Layer Test Board
Ambient Temperature (C)
P
o
w
e
r
D
i
s
s
i
p
a
t
i
o
n
(
W
)
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0
25
50
75
100
125
150
85
1.54W
1.25W
PDIP
14
JA
=81
C/W
PDIP
8
JA
=100
C/W
Package Power Dissipation vs Ambient Temp.
JEDEC JESD51-3 Low Effective Thermal Conductivity Test Board
Ambient Temperature (C)
P
o
w
e
r
D
i
s
s
i
p
a
t
i
o
n
(
W
)
1.2
1
0.8
0.6
0.4
0.2
0
0
25
50
75
100
125
150
85
1.042W
781W
SO1
4
JA
=120
C/W
SO8
JA
=160
C/W
10
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
Applications Information
Product Description
The EL2250C/EL2450C are part of a family of the
industries fastest single supply operational amplifiers.
Connected in voltage follower mode, their -3dB band-
width is 125MHz while maintaining a 275 V/s slew
rate. With an input and output common mode range that
includes ground, these amplifiers were optimized for
single supply operation, but will also accept dual sup-
plies. They operate on a total supply voltage range as
low as +2.7V or up to +12V. This makes them ideal for
+3V applications, especially portable computers.
While many amplifiers claim to operate on a single sup-
ply, and some can sense ground at their inputs, most fail
to truly drive their outputs to ground. If they do succeed
in driving to ground, the amplifier often saturates, caus-
ing distortion and recovery delays. However, special
circuitry built into the EL2250C/EL2450C allows the
output to follow the input signal to ground without
recovery delays.
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. The power
supply pins must be well bypassed to reduce the risk of
oscillation. The combination of a 4.7F tantalum capac-
itor in parallel with a 0.1 F ceramic capacitor has been
shown to work well when placed at each supply pin. For
single supply operation, where the GND pin is con-
nected to the ground plane, a single 4.7F tantalum
capacitor in parallel with a 0.1F ceramic capacitor
across the V
S+
and GND pins will suffice.
For good AC performance, parasitic capacitance should
be kept to a minimum. Ground plane construction
should be used. Carbon or Metal-Film resistors are
acceptable with the Metal-Film 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 par-
asitic inductance and capacitance which will result in
some additional peaking and overshoot.
Supply Voltage Range and Single-Supply
Operation
The EL2250C/EL2450C have been designed to operate
with supply voltages having a span of greater than 2.7V,
and less than 12V. In practical terms, this means that the
EL2250C/EL2450C will operate on dual supplies rang-
ing from 1.35V to 6V. With a single-supply, the
EL2250C/EL2450C will operate from +2.7V to +12V.
Performance has been optimized for a single +5V
supply.
Pins 8 and 4 are the power supply pins on the EL2250C.
The positive power supply is connected to pin 8. When
used in single supply mode, pin 4 is connected to
ground. When used in dual supply mode, the negative
power supply is connected to pin 4.
Pins 4 and 11 are the power supply pins on the
EL2450C. The positive power supply is connected to pin
4. When used in single supply mode, pin 11 is connected
to ground. When used in dual supply mode, the negative
power supply is connected to pin 11.
As supply voltages continue to decrease, it becomes nec-
essary to provide input and output voltage ranges that
can get as close as possible to the supply voltages. The
EL2250C/EL2450C have an input voltage range that
includes the negative supply and extends to within 1.2V
of the positive supply. So, for example, on a single +5V
supply, the EL2250C/EL2450C have an input range
which spans from 0V to 3.8V.
The output range of the EL2250C/EL2450C is also quite
large. It includes the negative rail, and extends to within
1V of the top supply rail with a 1k
load. On a +5V sup-
ply, the output is therefore capable of swinging from 0V
to +4V. On split supplies, the output will swing 4V. If
the load resistor is tied to the negative rail and split sup-
plies are used, the output range is extended to the
negative rail.
Choice Of Feedback Resistor, R
F
The feedback resistor forms a pole with the input capac-
itance. As this pole becomes larger, phase margin is
reduced. This increases ringing in the time domain and
peaking in the frequency domain. Therefore, R
F
has
11
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
some maximum value which should not be exceeded for
optimum performance. If a large value of R
F
must be
used, a small capacitor in the few picofarad range in par-
allel with R
F
can help to reduce this ringing and peaking
at the expense of reducing the bandwidth.
As far as the output stage of the amplifier is concerned,
R
F
+ R
G
appear in parallel with R
L
for gains other than
+1. As this combination gets smaller, the bandwidth
falls off. Consequently, R
F
has a minimum value that
should not be exceeded for optimum performance.
For A
V
= +1, R
F
= 0
is optimum. For A
V
= -1 or +2
(noise gain of 2), optimum response is obtained with R
F
between 500
and 1k
. For Av = -4 or +5 (noise gain of
5), keep R
F
between 2k
and 10k
.
Video Performance
For good video performance, an amplifier is required to
maintain the same output impedance and the same fre-
quency response as DC levels are changed at the output.
This can be difficult when driving a standard video load
of 150
, because of the change in output current with
DC level. Differential Gain and Differential Phase for
the EL2250C/EL2450C are specified with the black
level of the output video signal set to +1.2V. This allows
ample room for the sync pulse even in a gain of +2 con-
figuration. This results in dG and dP specifications of
0.05% and 0.05 while driving 150
at a gain of +2.
Setting the black level to other values, although accept-
able, will compromise peak performance. For example,
looking at the single supply dG and dP curves for
R
L
=150
, if the output black level clamp is reduced
from 1.2V to 0.6V dG/dP will increase from
0.05%/0.05 to 0.08%/0.25 Note that in a gain of +2
configuration, this is the lowest black level allowed such
that the sync tip doesn't go below 0V.
If your application requires that the output goes to
ground, then the output stage of the EL2250C/EL2450C,
like all other single supply op amps, requires an external
pull down resistor tied to ground. As mentioned above,
the current flowing through this resistor becomes the DC
bias current for the output stage NPN transistor. As this
current approaches zero, the NPN turns off, and dG and
dP will increase. This becomes more critical as the load
resistor is increased in value. While driving a light load,
such as 1k
, if the input black level is kept above 1.25V,
dG and dP are a respectable 0.03% and 0.03.
For other biasing conditions see the Differential Gain
and Differential Phase vs. Input Voltage curves.
Output Drive Capability
In spite of their moderately low 5mA of supply current,
the EL2250C/EL2450C are capable of providing
100mA of output current into a 10
load, or 60mA
into 50
. With this large output current capability, a
50
load can be driven to 3V with V
S
= 5V, making
it an excellent choice for driving isolation transformers
in telecommunications applications.
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 resis-
tor will de-couple the EL2250C/EL2450C from the
cable and allow extensive capacitive drive. However,
other applications may have high capacitive loads with-
out a back-termination resistor. In these applications, a
small series resistor (usually between 5
and 50
) can
be placed in series with the output to eliminate most
peaking. The gain resistor (R
G
) can then be chosen to
make up for any gain loss which may be created by this
additional resistor at the output.
Video Sync Pulse Remover Application
All CMOS Analog to Digital Converters (A/Ds) have a
parasitic latch-up problem when subjected to negative
input voltage levels. Since the sync tip contains no use-
ful video information and it is a negative going pulse, we
can chop it off.
Figure 1 shows a unity gain connected amplifier A of an
EL2250C. Figure 2 shows the complete input video sig-
nal applied at the input, as well as the output signal with
the negative going sync pulse removed.
12
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
Short Circuit Current Limit
The EL2250C/EL2450C have internal short circuit pro-
tection circuitry that protect it in the event of its output
being shorted to either supply rail. This limit is set to
around 100mA nominally and reduces with increasing
junction temperature. It is intended to handle temporary
shorts. If an output is shorted indefinitely, the power dis-
sipation could easily increase such that the part will be
destroyed. Maximum reliability is maintained if the out-
put current never exceeds 90mA. A heat sink may be
required to keep the junction temperature below abso-
lute maximum when an output is shorted indefinitely.
Power Dissipation
W i t h t h e h i g h o u t p u t d r i v e c a p a b i l i t y o f t h e
EL2250C/EL2450C, it is possible to exceed the 150C
Absolute Maximum junction temperature under certain
load current conditions. Therefore, it is important to cal-
culate the maximum junction temperature for the
application to determine if power-supply voltages, load
conditions, or package type need to be modified for the
EL2250C/EL2450C to remain in the safe operating area.
The maximum power dissipation allowed in a package is
determined according to [1]:
where:
T
JMAX
= Maximum Junction Temperature
T
AMAX
= Maximum Ambient Temperature
JA
= Thermal Resistance of the Package
PD
MAX
= 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]
where:
N = Number of amplifiers
V
S
= Total Supply Voltage
I
SMAX
= Maximum Supply Current per amplifier
V
OUT
= Maximum Output Voltage of the Application
R
L
= Load Resistance tied to Ground
If we set the two PD
MAX
equations, [1] & [2], equal to
each other, and solve for V
S
, we can get a family of
curves for various loads and output voltages according
to [3]:
Figure 1.
Figure 2.
PD
MAX
T
JMAX
T
AMAX
JA
---------------------------------------------
=
PD
MAX
N
V
s
I
SMAX
V
S
V
OUT
(
)
V
OUT
R
L
---------------
+
=
V
S
R
L
T
JMAX
T
AMAX
(
)
N
JA
----------------------------------------------------------------
V
OUT
(
)
+
IS R
L
(
)
V
OUT
+
-------------------------------------------------------------------------------------------
=
13
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
Figures 3 through 6 below show total single supply volt-
age V
S
vs. R
L
for various output voltage swings for the
PDIP and SO packages. The curves assume WORST
CASE conditions of T
A
= +85C and I
S
= 6.5mA per
amplifier.
14
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
EL2250C Single Supply Voltage vs R
LOAD
for Various V
OUT
(PDIP Package)
Figure 3.
Figure 4.
EL2250C Single Supply Voltage vs R
LOAD
for Various V
OUT
(SO Package)
Figure 5.
EL2450C Single Supply Voltage vs R
LOAD
for Various V
OUT
(PDIP Package)
EL2450C Single Supply Voltage vs R
LOAD
for Various V
OUT
(SO Package)
Figure 6.
15
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
EL2250C/EL2450C Macromodel
(one amplifier)
* Revision A, April 1996
* Pin numbers reflect a standard single op amp.
* Connections: +input
* | -input
* | | +Vsupply
* | | | -Vsupply
* | | | | output
.subckt EL2250/el 3 2 7 4 6
*
* Input Stage
*
i1 7 10 250A
i2 7 11 250A
r1 10 11 4k
q1 12 2 10 qp
q2 13 3 11 qpa
r2 12 4 100
r3 13 4 100
*
* Second Stage & Compensation
*
gm 15 4 13 12 4.6m
r4 15 4 15Meg
c1 15 4 0.36pF
*
* Poles
*
e1 17 4 15 4 1.0
r6 17 25 400
c3 25 4 1pF
r7 25 18 500
c4 18 4 1pF
*
* Output Stage
*
i3 20 4 1.0mA
q3 7 23 20 qn
q4 7 18 19 qn
q5 7 18 21 qn
q6 4 20 22 qp
q7 7 23 18 qn
d1 19 20 da
r8 21 6 2
r9 22 6 2
r10 18 21 10k
r11 7 23 100k
d2 23 24 da
d3 24 4 da
d4 23 18 da
*
* Power Supply Current
*
ips 7 4 3.2mA
*
* Models
*
.model qn npn(is=800e-18 bf=150 tf=0.02nS)
.model qpa pnp(is=810e-18 bf=50 tf=0.02nS)
.model qp pnp(is=800e-18 bf=54 tf=0.02nS)
.model da d(tt=0nS)
.ends
16
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
EL2250C/EL2450C Macromodel
(one amplifier)
17
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
E
L
2
2
5
0
C
,
E
L
2
4
5
0
C
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.
S
e
p
t
e
m
b
e
r
2
6
,
2
0
0
1
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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