Page 1
EL2126C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
EL2126C - Preliminary
Features
• Voltage noise of only 1.3nV/√Hz
• Current noise of only 1.2pA/√Hz
• Low offset voltage ≤200µV
• 90MHz -3dB BW for AV=10
• Very low supply current -4.7mA
• SOT23 package
• ±5V to ±15V operation
Applications
• Ultrasound input amplifiers
• Wideband instrumentation
• Communication equipment
• AGC & PLL active filters
• Wideband sensors
Ordering Information
Part No Package Tape & Reel Outline #
EL2126CW 5-Pin SOT23 MDP0038
EL2126CS 8-Pin SO MDP0027
EL2126CN 8-Pin PDIP MDP0031
General Description
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 create 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 feedback loop, a common requirement for many filter topologies. It
operates from ±5V to ±15V supplies and is available in a 5-pin SOT23
package and 8-pin SO and 8-pin PDIP 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.
Connection Diagrams
1
NC
1
OUT
2
VS-
3
EL2126C
(5-Pin SOT23)
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.
5
VS+
-+
4
IN-IN+
2
IN-
3
IN+
4
VS-
(8-Pin SO and 8-Pin PDIP)
-
+
EL2126C
8
NC
7
VS+
6
OUT
5
NC
October 3, 2001
Page 2
EL2126C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Absolute Maximum Ratings (T
VS+ to VS- 33V
Continuous Output Current 40mA
Any Input VS+ - 0.3V to VS- + 0.3V
EL2126C - Preliminary
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 = T
= 25°C)
A
Power Dissipation See Curves
Operating Temperature -40°C to +85°C
Storage Temperature -60°C to +150°C
A
Electrical Characteristics
VS+ = +5V, VS- = -5V, TA = 25°C, R
Parameter Description Conditions Min Typ Max Unit
DC Performance
V
OS
Input Offset Voltage (SO8 & PDIP8) 0.5 3 mV
Input Offset Voltage (SOT23-5) 3 mV
T
I
I
T
C
A
CVOS
B
OS
CIB
IN
VOL
Offset Voltage Temperature Coefficient TBD µV/°C
Input Bias Current -15 -6 µA
Input Bias Current Offset 0.13 0.8 µA
Input Bias Current Temperature Coefficient TBD nA/°C
Input Capacitance 2.2 pF
Open Loop Gain VO = ±2.5V 75 86 dB
PSRR Power Supply Rejection Ratio
CMRR Common Mode Rejection Ratio
CMIR Common Mode Input Range ±3.5 V
V
+ Positive Output Voltage Swing R
OUT
V
- Negative Output Voltage Swing -3.7 -4 V
OUT
V
I
I
OUTL
OUT
SY
Output Voltage Swing into 100Ω ±3 ±3.4 V
Output Short Circuit Current
Supply Current 4.7 5.5 mA
AC Performance - VCC = -5V, R
BW -3dB Bandwidth, R
BW ±0.1dB ±0.1dB Bandwidth, R
BW ±1dB ±1dB Bandwidth, R
Peaking Peaking, R
SR Slew Rate (±2.5V Square Wave, Measured
OS+ Negative Overshoot, 4Vpk-pk Output Square
OS- Positive Overshoot, 4Vpk-pk Output Square
T
S
V
N
I
N
20%-80%)
Wave
Wave
Settling Time to 0.1% of ±1V Pulse 51 ns
Voltage Noise Spectral Density 1.3 nV/√Hz
Current Noise Spectral Density 1.2 pA/√Hz
HD2 2nd Harmonic Distortion
HD3 3rd Harmonic Distortion
THD Total Harmonic Distortion
IMD Intermodulation Distortion
1. Measured by moving the supplies from ±4V to ±6V
2. Measured with the input moving -4.4V to +3.5V
= 180Ω, RG = 20Ω, RL = 500Ω unless otherwise specified.
F
[1]
[2]
= 1kΩ, RL = ∞ +3.7 +3.8 V
F
[3]
= 20Ω, C
G
= 500Ω 0.6 dB
L
= 3pF
L
= 500Ω 98 MHz
L
= 500Ω 17 MHz
L
= 500Ω 80 MHz
L
70 100 dB
70 85 dB
70 100 mA
TBD 120 V/µs
+2.8 %
-7 %
[4]
[4]
[5]
[6]
TBD dBc
TBD dBc
TBD dBc
TBD %
2
Page 3
EL2126C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
3. Pulse test only and using a 10Ω load
4. Frequency = 10MHz, V
5. Frequency = 20MHz, V
6. Two-tone IMD, frequencies = 5MHz and 6MHz at -20dBm output level, R
Electrical Characteristics
VS+ = +15V, VS- = -15V, TA = 25°C, R
Parameter Description Conditions Min Typ Max Unit
DC Performance
V
OS
T
CVOS
I
B
I
OS
T
CIB
C
IN
A
VOL
PSRR Power Supply Rejection Ratio
CMRR Common Mode Rejection Ratio
CMIR Common Mode Input Range ±13.5 TBD V
V
OUT
V
+ Positive Output Voltage Swing into 100Ω RF = 1kΩ, RL = ∞ 10.7 11.7 V
OUTL
V
- Negative Output Voltage Swing into 100Ω -9.5 -10.2 V
OUTL
I
OUT
I
SY
AC Performance - VCC = -5V, R
BW -3dB Bandwidth, R
BW ±0.1dB ±0.1dB Bandwidth, R
BW ±1dB ±1dB Bandwidth, R
Peaking Peaking, R
SR Slew Rate (±2.5V Square Wave, Measured
OS+ Positive Overshoot, 4Vpk-pk Output Square
OS- Negative Overshoot, 4Vpk-pk Output Square
T
S
V
N
I
N
HD2 2nd Harmonic Distortion
HD3 3rd Harmonic Distortion
THD Total Harmonic Distortion
IMD Intermodulation Distortion
1. Measured by moving the supplies from ±13.5V to ±16.5V
2. Measured with the input moving -14.4V to +13.8V
3. Pulse test only and using a 10Ω load
4. Frequency = 10MHz, V
5. Frequency = 20MHz, V
Input Offset Voltage (SO8 & PDIP8) -0.5 3 mV
Input Offset Voltage (SOT23-5) 3 mV
Offset Voltage Temperature Coefficient TBD µV/°C
Input Bias Current -15 -5 µA
Input Bias Current Offset 0.16 0.7 µA
Input Bias Current Temperature Coefficient TBD nA/°C
Input Capacitance 2.2 pF
Open Loop Gain 75 88 dB
Output Voltage Swing ±13.5 ±13.7 V
Output Short Circuit Current
Supply Current 5 6 mA
25%-75%)
Wave
Wave
Settling Time to 0.1% of ±1V Pulse 48 ns
Voltage Noise Spectral Density 1.4 nV/√Hz
Current Noise Spectral Density 1.1 pA/√Hz
= 1Vpk-pk, into 100Ω and 5pF load
OUT
= -20dBm (0.0274V
OUT
= 180Ω, RG = 20Ω, RL = 500Ω unless otherwise specified.
F
= 20Ω, C
G
= 500Ω 2.1 dB
L
L
= 500Ω 136 MHz
L
= 500Ω 26 MHz
L
= 500Ω 60 MHz
L
) into 500Ω and 15pF load
RMS
[1]
[2]
[3]
= 3pF
= 500Ω and 15pF
LOAD
65 80 dB
70 85 dB
90 150 mA
TBD 150 V/µS
1.6 %
-4.4 %
[4]
[4]
[5]
[6]
= 1Vpk-pk, into 100Ω and 5pF load
OUT
= -20dBm (0.0274V
OUT
) into 500Ω and 15pF load
RMS
TBD dBc
TBD dBc
TBD dBc
TBD %
EL2126C - Preliminary
3
Page 4
EL2126C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
6. Two-tone IMD, frequencies = 5MHz and 6MHz at -20dBm output level, R
EL2126C - Preliminary
= 500Ω and 15pF
LOAD
4
Page 5
Typical Performance Curves
EL2126C - Preliminary
EL2126C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Non-Inverting Frequency Response for Various R
10
VS=±5V
AV=10
6
CL=5pF
RL=500Ω
2
-2
Normalized Gain (dB)
-6
-10
1M 10M 100M
Inverting Frequency Response for Various R
8
VS=±5V
AV=-10
4
CL=5pF
RL=500Ω
0
-4
Normalized Gain (dB)
-8
-12
1M 10M 100M
RF=500Ω
RF=180Ω
Frequency (Hz)
RF=500Ω
RF=350Ω
RF=200Ω
RF=100Ω
Frequency (Hz)
RF=100Ω
F
F
RF=1kΩ
RF=1kΩ
Non-Inverting Frequency Response for Various R
10
VS=±15V
AV=10
6
CL=5pF
RL=500Ω
2
-2
Normalized Gain (dB)
-6
-10
1M 10M 100M
Inverting Frequency Response for Various R
8
VS=±15V
AV=-10
4
CL=5pF
RL=500Ω
0
-4
Normalized Gain (dB)
-8
-12
1M 10M 100M
RF=1kΩ
RF=500Ω
RF=180Ω
Frequency (Hz)
RF=1kΩ
RF=500Ω
RF=350Ω
RF=200Ω
Frequency (Hz)
F
RF=100Ω
F
RF=100Ω
Non-Inverting Frequency Response for Various Gain
10
VS=±5V
RG=20Ω
6
RL=500Ω
CL=5pF
2
-2
Normalized Gain (dB)
-6
-10
1M 10M 100M
AV=50
Frequency (Hz)
AV=20
AV=10
Non-Inverting Frequency Response for Various Gain
10
VS=±15V
RG=20Ω
6
RL=500Ω
CL=5pF
2
-2
Normalized Gain (dB)
-6
-10
1M 10M 100M
Frequency (Hz)
AV=10
AV=20
AV=50
5
Page 6
EL2126C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Typical Performance Curves
Inverting Frequency Response for Various Gain
EL2126C - Preliminary
8
VS=±5V
CL=5pF
RG=35Ω
4
0
-4
Normalized Gain (dB)
-8
-12
1M 10M 100M
Non-Inverting Frequency Response for Various Output
Signal Levels
8
VS=±5V
CL=5V
RL=500Ω
4
RF=180Ω
AV=10
0
-4
Normalized Gain (dB)
-8
-12
1M 10M 100M
VO=5V
AV=50
Frequency (Hz)
VO=500mV
PP
VO=2.5V
PP
VO=1V
Frequency (Hz)
PP
AV=20
PP
AV=10
VO=30mV
PP
Inverting Frequency Response for Various R
8
VS=±15V
CL=5pF
RG=20Ω
4
0
-4
Normalized Gain (dB)
-8
-12
1M 10M 100M
Non-Inverting Frequency Response for Various Output
Signal Levels
10
VS=±15V
CL=5pF
RL=500Ω
6
RF=180Ω
AV=10
2
-2
VO=10V
Normalized Gain (dB)
-6
-10
1M 10M 100M
PP
VO=5V
Frequency (Hz)
PP
VO=2.5V
Frequency (Hz)
AV=50
PP
VO=1V
VO=500mV
PP
AV=20
F
AV=10
VO=30mV
PP
PP
Inverting Frequency Response for Various Output Signal
Levels
8
4
0
-4
VS=±5V
Normalized Gain (dB)
CL=5p
-8
RL=500Ω
RF=350Ω
AV=10
-12
1M 10M 100M
VO=1V
VO=3.4V
PP
VO=2.5V
Frequency (Hz)
PP
PP
VO=500mV
VO=30mV
Inverting Frequency Response for Various Output Signal
Levels
8
PP
PP
4
0
-4
VS=±15V
Normalized Gain (dB)
CL=5pF
-8
RL=500Ω
RF=200Ω
AV=10
-12
1M 10M 100M
VO=1V
VO=3.4V
VO=2.5V
Frequency (Hz)
VO=500mV
PP
VO=30mV
PP
PP
PP
PP
6
Page 7
Typical Performance Curves
EL2126C - Preliminary
EL2126C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Non-Inverting Frequency Response for Various C
10
VS=±5V
RF=180Ω
6
AV=10
RL=500Ω
2
-2
Normalized Gain (dB)
-6
-10
1M 10M 100M
Inverting Frequency Response for Various C
8
VS=±5V
RF=350Ω
4
RL=500Ω
AV=-10
0
-4
Normalized Gain (dB)
-8
-12
1M 10M 100M
CL=5pF
Frequency (Hz)
CL=16pF
CL=11pF
CL=5pF
Frequency (Hz)
CL=28pF
CL=1pF
CL=1.2pF
L
L
CL=16pFCL=11pF
CL=28pF
Non-Inverting Frequency Response for Various C
10
VS=±15V
RF=180Ω
6
AV=10
RL=500Ω
2
-2
Normalized Gain (dB)
-6
-10
1M 10M 100M
Inverting Frequency Response for Various C
8
VS=±15V
RF=200Ω
4
RL=500Ω
AV=-10
0
-4
Normalized Gain (dB)
-8
-12
1M 10M 100M
CL=28pF
CL=16pF
CL=5pF
Frequency (Hz)
CL=16pF
CL=11pF
Frequency (Hz)
L
CL=11pF
CL=1.2pF
L
CL=29pF
CL=5pF
CL=1.2pF
Open Loop Gain/Phase
100
80
60
40
Open Loop Gain (dB)
20
0
10k 10M 1G
100k 100M1M
Frequency (Hz)
250
150
50
-50
-150
-250
Supply Current vs Supply Voltage
Open Loop Phase (°)
0.6/div
Supply Current (µA)
0
0
1.5/div
Supply Voltage (V)
7
Page 8
EL2126C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Typical Performance Curves
Bandwidth vs V
EL2126C - Preliminary
160
RG=20Ω
140
RL=500Ω
CL=5pF
120
100
80
60
-3dB Bandwidth
40
20
AV=-50
0
0 2 4 6 8 10 14 16
Large Signal Step Response
VS=±5V
VO=2V
0.5V/div
PP
s
RF=180Ω
RG=20Ω
AV=-10
AV=10
AV=-20
AV=-20
AV=-50
AV=50
12
±VS (V)
10ns/div
Peaking vs V
3.0
2.5
2.0
1.5
Peaking (dB)
1.0
0.5
0
0 2 4 6 8 10 14 16
Small Signal Step Response
20mV/div
RG=20Ω
RL=500Ω
CL=5pF
VS=±5V
VO=100mV
RF=180Ω
RG=20Ω
s
AV=10
AV=-10
±Supply Voltage (V)
PP
10ns/div
12
1MHz Harmonic Distortion vs Output Swing
-40.0
VS=±5V
VO=2V
P-P
RF=180Ω
AV=10
RL=500Ω
0 1 2 3 4 5 7 8
V
3rd H
OUT
2nd H
(V
)
P-P
Harmonic Distortion (dBc)
-50.0
-60.0
-70.0
-80.0
-90.0
-100.0
1MHz Harmonic Distortion vs Output Swing
-30.0
VS=±5V
VO=2V
-40.0
-50.0
-60.0
-70.0
-80.0
Harmonic Distortion (dBc)
-90.0
6
-100.0
P-P
RF=180Ω
AV=10
RL=500Ω
0 5 10 15 20 25
V
OUT
2nd H
3rd H
(V
)
P-P
8
Page 9
Typical Performance Curves
EL2126C - Preliminary
EL2126C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Total Harmonic Distortion vs Frequency
-20
VS=±5V
VO=2V
-30
-40
-50
-60
THD (dBc)
-70
-80
-90
Settling Time (ns)
P-P
1k 10k 100M
Settling Time vs Accuracy
70
60
50
40
30
20
10
0
0.1 1.0 10.0
100k 1M 10M
Frequency (Hz)
V
S
=
±
5
V
,
V
O
=
5
V
S
=
±
1
5
V
,
V
O
=
5
V
V
S
=
V
=
S
±
1
Accuracy (%)
±
5
V
5
V
,
P
,
V
O
=
2
V
P
-
P
V
O
=
2
V
P
-
P
V
P
-
P
-
P
Noise vs Frequency
10
(nV/√Hz)
N
(pA/√Hz), V
N
I
IN, VS=±15V
1
10 100 10k 100k
Group Delay vs Frequency
16
VS=±5V
RL=500Ω
12
8
4
Group Delay (ns)
0
-4
1M 10M 100M 400M
IN, VS=±5V
VN, VS=±15V
VN, VS=±5V
1k
Frequency (Hz)
AV=10
AV=-10
Frequency (Hz)
CMRR vs Frequency
-10
-30
-50
-70
CMRR (dB)
-90
-110
10 1M 10M 100M
1k 100k100 10k
Frequency (Hz)
PSRR vs Frequency
110
90
70
50
PSRR (dB)
30
10
10k 100k 1M 10M 200M
PSRR-
PSRR+
Frequency (Hz)
VS=±5V
9
Page 10
EL2126C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Typical Performance Curves
Closed Loop Output Impedance vs Frequency
100
EL2126C - Preliminary
VS=±5V VS=±5V
10
1
0.1
Closed Loop Output Impedance (Ω)
0.01
10k 1M 100M
100k 10M
Frequency (Hz)
Bandwidth and Peaking vs Temperature
120
100
80
60
40
Bandwidth (MHz)
20
0
-40 40 160
800 120
Temperature
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
Peaking (dB)
10
Page 11
EL2126C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
EL2126C - Preliminary
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.
October 3, 2001
11
Printed in U.S.A.
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