1
FN7045.2
EL2125
Ultra-Low Noise, Low Power, Wideband
Amplifier
The EL2125 is an ultra-low noise, wideband amplifier that
runs on half the supply current of competitive parts. It is
intended for use in systems such as ultrasound imaging
where a very small signal needs to be amplified by a large
amount without adding significant noise. Its low power
dissipation enables it to be packaged in the tiny SOT-23
package, which further helps systems where many input
channels create both space and power dissipation problems.
The EL2125 is stable for gains of 10 and greater and uses
traditional voltage feedback. This allows the use of reactive
elements in the feedback loop, a common requirement for
many filter topologies. It operates from 2.5V to 15V
supplies and is available in the 5-pin SOT-23 and 8-pin SO
packages.
The EL2125 is fabricated using Elantec's proprietary
complementary bipolar process, and is specified for
operation from -45C to +85C.
Features
Voltage noise of only 0.83nV/
Hz
Current noise of only 2.4pA/
Hz
200V offset voltage
175MHz -3dB BW for A
V
= 10
Low supply current - 10mA
SOT-23 package available
2.5V to 15V operation
Pb-Free available (RoHS compliant)
Applications
Ultrasound input amplifiers
Wideband instrumentation
Communication equipment
AGC & PLL active filters
Wideband sensors
Pinouts
EL2125
(5-PIN SOT-23)
TOP VIEW
EL2125
(8-PIN SO)
TOP VIEW
Ordering Information
PART NUMBER
PACKAGE
TAPE &
REEL
PKG. DWG. #
EL2125CW-T7
5-Pin SOT-23
7" (3K pcs)
MDP0038
EL2125CW-T7A
5-Pin SOT-23
7" (250 pcs)
MDP0038
EL2125CS
8-Pin SO
-
MDP0027
EL2125CS-T7
8-Pin SO
7"
MDP0027
EL2125CS-T13
8-Pin SO
13"
MDP0027
EL2125CSZ
(See Note)
8-Pin SO
(Pb-free)
-
MDP0027
EL2125CSZ-T7
(See Note)
8-Pin SO
(Pb-free)
7"
MDP0027
EL2125CSZ-T13
(See Note)
8-Pin SO
(Pb-free)
13"
MDP0027
NOTE: Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with
both SnPb and Pb-free soldering operations. Intersil Pb-free products
are MSL classified at Pb-free peak reflow temperatures that meet or
exceed the Pb-free requirements of IPC/JEDEC J STD-020.
1
2
3
5
4
-
+
OUT
VS-
IN+
VS+
IN-
1
2
3
4
8
7
6
5
OUT
VS-
IN+
VS+
IN-
-
+
NC
NC
NC
Data Sheet
April 21, 2005
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2003, 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
2
FN7045.2
April 21, 2005
Absolute Maximum Ratings
(T
A
= 25C)
V
S
+ to V
S
- . . . . . . . . . . . . . . . . . . . . . . . . . . 33V
Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mA
Any Input . . . . . . . . . . . . . . . . . . . . . . . . . . V
S
- - 0.3V to V
S
+ + 0.3V
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Ambient Operating Temperature . . . . . . . . . . . . . . . .-45C to +85C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C
Maximum Die Junction Temperature . . . . . . . . . . . . . . . . . . . +150C
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: T
J
= T
C
= T
A
Electrical Specifications
V
S
= 5V, T
A
= 25C, R
F
= 180
, R
G
= 20
,
R
L
= 500
unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
DC PERFORMANCE
V
OS
Input Offset Voltage (SO8)
0.2
2
mV
Input Offset Voltage (SOT23-5)
3
mV
T
CVOS
Offset Voltage Temperature Coefficient
1.8
V/C
I
B
Input Bias Current
-30
-22
A
I
OS
Input Bias Current Offset
0.4
2
A
T
CIB
Input Bias Current Temperature
Coefficient
0.09
A/C
C
IN
Input Capacitance
2.2
pF
A
VOL
Open Loop Gain
80
87
dB
PSRR
Power Supply Rejection Ratio
(Note 1)
80
97
dB
CMRR
Common Mode Rejection Ratio
at CMIR
80
106
dB
CMIR
Common Mode Input Range
-4.6
3.8
V
V
OUTH
Output Voltage Swing High
No load, R
F
= 1k
3.5
3.65
V
V
OUTL
Output Voltage Swing Low
No load, R
F
= 1k
-3.87
-3.7
V
V
OUTH2
Output Voltage Swing High
R
L
= 100
3
3.3
V
V
OUTL2
Output Voltage Swing Low
R
L
= 100
-3.5
-3
V
I
OUT
Output Short Circuit Current (Note 2)
80
100
mA
I
S
Supply Current
10.1
11
mA
AC PERFORMANCE - R
G
= 20
, C
L
= 5pF
BW
-3dB Bandwidth
175
MHz
BW 0.1dB
0.1dB Bandwidth
34
MHz
BW 1dB
1dB Bandwidth
150
MHz
Peaking
Peaking
0.4
dB
SR
Slew Rate
V
OUT
= 2V
P-P
, measured at 20% to 80%
150
185
V/s
OS
Overshoot, 4V
P-P
Output Square Wave
Positive
0.6
%
Negative
2.7
%
t
S
Settling Time to 0.1% of 1V Pulse
42
ns
V
N
Voltage Noise Spectral Density
10kHz
0.83
nV/
Hz
EL2125
3
FN7045.2
April 21, 2005
I
N
Current Noise Spectral Density
10kHz
2.4
pA/
Hz
HD2
2nd Harmonic Distortion (Note 3)
-74
dBc
HD3
3rd Harmonic Distortion
-91
dBc
NOTES:
1. Measured by moving the supplies from 4V to 6V
2. Pulse test only
3. Frequency = 1MHz, V
OUT
= 2V
P-P
, into 500
and 5pF load
Electrical Specifications
V
S
= 5V, T
A
= 25C, R
F
= 180
, R
G
= 20
,
R
L
= 500
unless otherwise specified. (Continued)
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
Electrical Specifications
V
S
= 15V, T
A
= 25C, R
F
= 180
, R
G
= 20
, R
L
= 500
unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
DC PERFORMANCE
V
OS
Input Offset Voltage (SO8)
0.6
3
mV
Input Offset Voltage (SOT23-5)
3
mV
T
CVOS
Offset Voltage Temperature Coefficient
4.9
V/C
I
B
Input Bias Current
-30
-24
A
I
OS
Input Bias Current Offset
0.4
2
A
T
CIB
Input Bias Current Temperature
Coefficient
0.08
A/C
C
IN
Input Capacitance
2.2
pF
A
VOL
Open Loop Gain
80
87
dB
PSRR
Power Supply Rejection Ratio
(Note 1)
80
97
dB
CMRR
Common Mode Rejection Ratio
at CMIR
75
105
dB
CMIR
Common Mode Input Range
-14.6
13.8
V
V
OUTH
Output Voltage Swing High
No load, R
F
= 1k
13.35
13.5
V
V
OUTL
Output Voltage Swing Low
No load, R
F
= 1k
-13.6
-13
V
V
OUTH2
Output Voltage Swing High
R
L
= 100
11
11.6
V
V
OUTL2
Output Voltage Swing Low
R
L
= 100
-10.4
-9.8
V
I
OUT
Output Short Circuit Current (Note 2)
120
250
mA
I
S
Supply Current
10.8
12
mA
AC PERFORMANCE - R
G
= 20
, C
L
= 5pF
BW
-3dB Bandwidth
220
MHz
BW 0.1dB
0.1dB Bandwidth
23
MHz
BW 1dB
1dB Bandwidth
63
MHz
Peaking
Peaking
2.5
dB
SR
Slew Rate
V
OUT
= 2V
P-P
, measured at 20% to 80%
180
225
V/s
OS
Overshoot, 4V
P-P
Output Square Wave
0.6
%
t
S
Settling Time to 0.1% of 1V Pulse
38
ns
V
N
Voltage Noise Spectral Density
10kHz
0.95
nV/
Hz
EL2125
4
FN7045.2
April 21, 2005
I
N
Current Noise Spectral Density
10kHz
2.1
pA/
Hz
HD2
2nd Harmonic Distortion (Note 3)
-73
dBc
HD3
3rd Harmonic Distortion
-96
dBc
NOTES:
1. Measured by moving the supplies from 13.5V to 16.5V
2. Pulse test only
3. Frequency = 1MHz, V
OUT
= 2V
P-P
, into 500
and 5pF load
Electrical Specifications
V
S
= 15V, T
A
= 25C, R
F
= 180
, R
G
= 20
, R
L
= 500
unless otherwise specified. (Continued)
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
Typical Performance Curves
FIGURE 1. NON-INVERTING FREQUENCY RESPONSE FOR
VARIOUS R
F
FIGURE 2. NON-INVERTING FREQUENCY RESPONSE FOR
VARIOUS R
F
FIGURE 3. INVERTING FREQUENCY RESPONSE FOR
VARIOUS R
F
FIGURE 4. INVERTING FREQUENCY RESPONSE FOR
VARIOUS R
F
5
-5
1M
10M
100M
FREQUENCY (Hz)
NOR
M
ALIZED GAIN
(dB)
0
R
F
=1k
R
F
=499
R
F
=180
R
F
=100
V
S
=5V
A
V
=10
R
L
=500
C
L
=5pF
200M
5
0
-5
1M
10M
100M
FREQUENCY (Hz)
NOR
M
ALIZED GAIN
(dB)
R
F
=1k
R
F
=180
R
F
=700
R
F
=100
R
F
=499
V
S
=15V
A
V
=10
R
L
=500
C
L
=5pF
300M
6
2
-2
-6
-10
-14
1M
10M
100M
300M
FREQUENCY (Hz)
NORMALIZED GAIN
(
d
B)
V
S
=5V
A
V
=-10
R
L
=560
C
L
=5pF
R
F
=1k
R
F
=350
R
F
=200
R
F
=97.6
R
F
=499
6
2
-2
-6
-10
-14
1M
10M
100M
300M
FREQUENCY (Hz)
NORMALIZED GAIN
(
d
B)
R
F
=1k
R
F
=350
R
F
=200
R
F
=499
R
F
=97.6
V
S
=15V
A
V
=-10
R
L
=500
C
L
=5pF
EL2125
5
FN7045.2
April 21, 2005
FIGURE 5. NON-INVERTING FREQUENCY RESPONSE vs GAIN
FIGURE 6. NON-INVERTING FREQUENCY RESPONSE FOR
VARIOUS GAIN
FIGURE 7. INVERTING FREQUENCY RESPONSE vs GAIN
FIGURE 8. INVERTING FREQUENCY RESPONSE vs GAIN
FIGURE 9. NON-INVERTING FREQUENCY RESPONSE FOR
VARIOUS OUTPUT SIGNAL LEVELS
FIGURE 10. INVERTING FREQUENCY RESPONSE FOR
VARIOUS OUTPUT SIGNAL LEVELS
Typical Performance Curves
(Continued)
-5
0
5
1M
10M
100M 200M
FREQUENCY (Hz)
N
O
RM
AL
IZE
D
G
A
IN
(
d
B)
V
S
=5V
R
L
=500
C
L
=5pF
R
G
=20
A
V
=50
A
V
=20
A
V
=10
-5
0
5
N
O
RM
AL
IZE
D
G
A
IN
(
d
B)
V
S
=15V
R
L
=500
C
L
=5pF
R
F
=700
1M
10M
100M 200M
FREQUENCY (Hz)
A
V
=50
A
V
=20
A
V
=10
6
NORMALIZE
D
GAIN
(
d
B)
2
-2
-6
-10
1M
10M
100M
300M
FREQUENCY (Hz)
-14
A
V
=-10
A
V
=-50
A
V
=-20
V
S
=5V
R
L
=500
C
L
=5pF
R
G
=35
2
-14
0
6
NOR
M
ALIZED GAIN
(dB)
1M
10M
100M
300M
FREQUENCY (Hz)
A
V
=-50
A
V
=-20
A
V
=-10
V
S
=15V
R
L
=500
C
L
=5pF
R
G
=50
-5
5
NORMALIZED GAIN
(
d
B)
0
1M
10M
100M 200M
FREQUENCY (Hz)
V
S
=5V
A
V
=10
R
F
=180
R
L
= 500
C
L
=5pF
2V
PP
4V
PP
30mV
PP
500mV
PP
1V
PP
-14
6
NORMALIZED GAIN
(
d
B)
0
1M
10M
100M
300M
FREQUENCY (Hz)
V
S
=5V
A
V
=-10
R
F
=350
R
L
= 500
C
L
=5pF
2.5V
PP
500mV
PP
3.3V
PP
250mV
PP
3mV
PP
1V
PP
EL2125
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