The EL2126C 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 SOT23
package, which further helps systems where many input channels cre-
ate both space and power dissipation problems.
The EL2126C is stable for gains of 10 and greater and uses traditional
voltage feedback. This allows the use of reactive elements in the feed-
back loop, a common requirement for many filter topologies. It
operates from ±2.5V to ±15V supplies and is available in 5-pin SOT23
and 8-pin SO packages.
The EL2126C is fabricated in Elantec’s proprietary complementary
bipolar process, and is specified for operation over the full -40°C to
+85°C temperature range.
Applications
•
•
•
•
•
Ultrasound input amplifiers
Wideband instrumentation
Communication equipment
AGC & PLL active filters
Wideband sensors
Ordering Information
Part No
EL2126CW-T7
EL2126CW-T13
EL2126CS
EL2126CS-T7
EL2126CS-T13
Package
5-Pin SOT23
5-Pin SOT23
8-Pin SO
8-Pin SO
8-Pin SO
Tape &
Reel
7”
13”
-
7”
13”
Outline #
MDP0038
MDP0038
MDP0027
MDP0027
MDP0027
Connection Diagrams
NC 1
OUT 1
VS- 2
IN+ 3
EL2126C
(5-Pin SOT23)
5 VS+
IN- 2
IN+ 3
4 IN-
VS- 4
EL2126C
(8-Pin SO)
8 NC
7 VS+
6 OUT
5 NC
-
+
+
-
March 15, 2002
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.
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
Electrical Characteristics
V
S
+ = +5V, V
S
- = -5V, T
A
= 25°C, R
F
= 180Ω, R
G
= 20Ω, R
L
= 500Ω unless otherwise specified.
Parameter
DC Performance
V
OS
T
CVOS
I
B
I
OS
T
CIB
C
IN
A
VOL
PSRR
CMRR
CMIR
V
OUTH
V
OUTL
V
OUTH2
V
OUTL2
I
OUT
I
SY
BW
BW ±0.1dB
BW ±1dB
Peaking
SR
OS
t
S
V
N
I
N
HD2
HD3
Input Offset Voltage (SO8)
Input Offset Voltage (SOT23-5)
Offset Voltage Temperature Coefficient
Input Bias Current
Input Bias Current Offset
Input Bias Current Temperature Coefficient
Input Capacitance
Open Loop Gain
Power Supply Rejection Ratio
Common Mode Input Range
Positive Output Voltage Swing
Negative Output Voltage Swing
Positive Output Voltage Swing
Negative Output Voltage Swing
Output Short Circuit Current
Supply Current
-3dB Bandwidth, R
L
= 500Ω
±0.1dB Bandwidth, R
L
= 500Ω
±1dB Bandwidth, R
L
= 500Ω
Peaking, R
L
= 500Ω
Slew Rate
Overshoot, 4Vpk-pk Output Square Wave
Settling Time to 0.1% of ±1V Pulse
Voltage Noise Spectral Density
Current Noise Spectral Density
2nd Harmonic Distortion
3rd Harmonic Distortion
[3]
[3]
[2]
[1]
Description
Conditions
Min
Typ
0.2
17
Max
2
3
Unit
mV
mV
µV/°C
µA
-10
-7
0.06
0.013
2.2
0.6
µA
µA/°C
pF
dB
dB
dB
V
O
= -2.5V to +2.5V
at CMIR
No load, R
F
= 1kΩ
No load, R
F
= 1kΩ
R
L
= 100Ω
R
L
= 100Ω
80
80
75
-4.6
3.8
3.2
80
87
100
106
3.8
3.8
-4
3.45
-3.5
100
4.7
100
17
80
0.6
5.5
-3.2
-3.9
Common Mode Rejection Ratio
V
V
V
V
V
mA
mA
MHz
MHz
MHz
dB
V/µs
%
%
ns
nV/√Hz
pA/√Hz
dBc
dBc
AC Performance - R
G
= 20Ω, C
L
= 3pF
V
OUT
= 2V
PP
, measured at 20% to 80%
Positive
Negative
80
110
2.8
-7
51
1.3
1.2
-70
-70
1. Measured by moving the supplies from ±4V to ±6V
2. Pulse test only and using a 10Ω load
3. Frequency = 1MHz, V
OUT
= 2Vpk-pk, into 500Ω and 5pF load
2
EL2126C
EL2126C
Ultra-Low Noise, Low Power, Wideband Amplifier
Electrical Characteristics
V
S
+ = +15V, V
S
- = -15V, T
A
= 25°C, R
F
= 180Ω, R
G
= 20Ω, R
L
= 500Ω unless otherwise specified.
Parameter
DC Performance
V
OS
T
CVOS
I
B
I
OS
T
CIB
C
IN
A
VOL
PSRR
CMRR
CMIR
V
OUTH
V
OUTL
V
OUTH2
V
OUTL2
I
OUT
I
SY
BW
BW ±0.1dB
BW ±1dB
Peaking
SR
OS
T
S
V
N
I
N
HD2
HD3
Input Offset Voltage (SO8)
Input Offset Voltage (SOT23-5)
Offset Voltage Temperature Coefficient
Input Bias Current
Input Bias Current Offset
Input Bias Current Temperature Coefficient
Input Capacitance
Open Loop Gain
Power Supply Rejection Ratio
Common Mode Input Range
Positive Output Voltage Swing
Negative Output Voltage Swing
Positive Output Voltage Swing
Negative Output Voltage Swing
Output Short Circuit Current
Supply Current
-3dB Bandwidth, R
L
= 500Ω
±0.1dB Bandwidth, R
L
= 500Ω
±1dB Bandwidth, R
L
= 500Ω
Peaking, R
L
= 500Ω
Slew Rate (±2.5V Square Wave, Measured
25%-75%)
Overshoot, 4Vpk-pk Output Square Wave
Settling Time to 0.1% of ±1V Pulse
Voltage Noise Spectral Density
Current Noise Spectral Density
2nd Harmonic Distortion
3rd Harmonic Distortion
[3]
[3]
[2]
[1]
Description
Conditions
Min
Typ
0.5
4.5
Max
3
3
Unit
mV
mV
µV/°C
µA
-10
-7
0.12
0.016
2.2
0.7
µA
µA/°C
pF
dB
dB
dB
80
65
at CMIR
No load, R
F
= 1kΩ
No load, R
F
= 1kΩ
R
L
= 100Ω, R
F
= 1kΩ
R
L
= 100Ω, R
F
= 1kΩ
140
10.2
70
-14.6
13.6
90
80
85
13.8
13.7
-13.8
11.2
-10.3
220
5
135
26
60
2.1
6
-9.5
-13.7
Common Mode Rejection Ratio
V
V
V
V
V
mA
mA
MHz
MHz
MHz
dB
V/µS
%
%
ns
nV/√Hz
pA/√Hz
dBc
dBc
AC Performance - R
G
= 20Ω, C
L
= 3pF
130
Positive
Negative
150
1.6
-4.4
48
1.4
1.1
-72
-73
1. Measured by moving the supplies from ±13.5V to ±16.5V
2. Pulse test only and using a 10Ω load
3. Frequency = 1MHz, V
OUT
= 2Vpk-pk, into 500Ω and 5pF load
3
EL2126C
EL2126C
Ultra-Low Noise, Low Power, Wideband Amplifier
Typical Performance Curves
Non-Inverting Frequency Response for Various R
F
10
V
S
=±5V
A
V
=10
C
L
=5pF
R
L
=500Ω
R
F
=1kΩ
Normalized Gain (dB)
R
F
=500Ω
10
V
S
=±15V
A
V
=10
C
L
=5pF
R
L
=500Ω
R
F
=1kΩ
R
F
=500Ω
Non-Inverting Frequency Response for Various R
F
6
Normalized Gain (dB)
6
2
2
-2
R
F
=180Ω
-2
R
F
=180Ω
R
F
=100Ω
-6
R
F
=100Ω
-6
-10
1M
10M
Frequency (Hz)
100M
-10
1M
10M
Frequency (Hz)
100M
Inverting Frequency Response for Various R
F
8
V
S
=±5V
A
V
=-10
C
L
=5pF
R
L
=500Ω
R
F
=500Ω
R
F
=350Ω
R
F
=1kΩ
4
Normalized Gain (dB)
8
Inverting Frequency Response for Various R
F
V
S
=±15V
A
V
=-10
C
L
=5pF
R
L
=500Ω
R
F
=1kΩ
R
F
=500Ω
R
F
=350Ω
4
Normalized Gain (dB)
0
R
F
=200Ω
R
F
=100Ω
-8
0
R
F
=200Ω
-4
R
F
=100Ω
-8
-4
-12
1M
10M
Frequency (Hz)
100M
-12
1M
10M
Frequency (Hz)
100M
Non-Inverting Frequency Response for Various Gain
10
V
S
=±5V
R
G
=20Ω
R
L
=500Ω
C
L
=5pF
A
V
=10
A
V
=20
A
V
=50
-6
10
Non-Inverting Frequency Response for Various Gain
6
Normalized Gain (dB)
6
Normalized Gain (dB)
V
S
=±15V
R
G
=20Ω
R
L
=500Ω
C
L
=5pF
A
V
=10
2
2
A
V
=20
A
V
=50
-6
-2
-2
-10
1M
10M
Frequency (Hz)
100M
-10
1M
10M
Frequency (Hz)
100M
4
EL2126C
EL2126C
Ultra-Low Noise, Low Power, Wideband Amplifier
Typical Performance Curves
Inverting Frequency Response for Various Gain
8
V
S
=±5V
C
L
=5pF
R
G
=35Ω
Normalized Gain (dB)
8
V
S
=±15V
C
L
=5pF
R
G
=20Ω
Inverting Frequency Response for Various R
F
4
Normalized Gain (dB)
4
0
A
V
=-10
A
V
=-50
A
V
=-20
0
A
V
=-10
-4
A
V
=-50
-4
A
V
=-20
-8
-8
-12
1M
10M
Frequency (Hz)
100M
-12
1M
10M
Frequency (Hz)
100M
Non-Inverting Frequency Response for Various Output
Signal Levels
8
V
S
=±5V
C
L
=5pF
R
L
=500Ω
R
F
=180Ω
A
V
=10
V
O
=500mV
PP
V
O
=30mV
PP
10
Non-Inverting Frequency Response for Various Output
Signal Levels
V
S
=±15V
C
L
=5pF
R
L
=500Ω
R
F
=180Ω
A
V
=10
4
Normalized Gain (dB)
6
Normalized Gain (dB)
V
O
=30mV
PP
V
O
=500mV
PP
V
O
=1V
PP
0
2
-4
V
O
=5V
PP
V
O
=2.5V
PP
V
O
=1V
PP
-2
V
O
=10V
PP
V
O
=5V
PP
V
O
=2.5V
PP
-8
-6
-12
1M
10M
Frequency (Hz)
100M
-10
1M
10M
Frequency (Hz)
100M
Inverting Frequency Response for Various Output Signal
Levels
8
V
S
=±5V
C
L
=5pF
R
L
=500Ω
R
F
=350Ω
A
V
=10
V
O
=500mV
PP
V
O
=1V
PP
Normalized Gain (dB)
V
O
=30mV
PP
4
8
Inverting Frequency Response for Various Output Signal
