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EL2125C - Preliminary
EL2125C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Features
* * * * * * * Voltage noise of only 0.83nV/Hz Current noise of only 2.4pA/Hz Low offset voltage 200V 180MHz -3dB BW for AV=10 Low supply current - 10mA SOT23 package available 2.5V to 15V operation
General Description
The EL2125C 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 EL2125C 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 a 5-pin SOT23 package and 8-pin SO and 8-pin PDIP packages. The EL2125C is fabricated in Elantec's proprietary complementary bipolar process, and is specified for operation from -45C to +85C.
Applications
* * * * * Ultrasound input amplifiers Wideband instrumentation Communication equipment AGC & PLL active filters Wideband sensors
Ordering Information
Part No EL2125CW EL2125CS EL2125CN Package 5-Pin SOT23 8-Pin SO 8-Pin PDIP Tape & Reel Outline # MDP0038 MDP0027 MDP0031
Connection Diagrams
NC 1 OUT 1 VS- 2 IN+ 3 EL2125CW (5-Pin SOT23) 5 VS+ IN- 2 IN+ 3 4 INVS- 4
8 NC 7 VS+ 6 OUT 5 NC
+
+
-
EL2125CS (8-Pin SO and 8-Pin PDIP)
October 2, 2001
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.
(c) 2001 Elantec Semiconductor, Inc.
EL2125C - Preliminary
EL2125C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Absolute Maximum Ratings (T
VS+ to VSContinuous Output Current Any Input
A
= 25C)
33V 40mA VS- - 0.3V to VS+ + 0.3V
Power Dissipation Operating Temperature Storage Temperature
See Curves -45C to +85C -60C to +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: TJ = TC = TA
Electrical Characteristics
VS = 5V, TA = 25C, RF = 180, RG = 20, RL = 500 unless otherwise specified. Parameter DC Performance VOS TCVOS IB IOS TCIB CIN AVOL PSRR CMRR CMIR VOUT VOUTL IOUT IS BW BW 0.1dB BW 1dB Peaking SR OS TS VN IN HD2 HD3 THD IMD 1. 2. 3. 4. 5. 6. Input Offset Voltage (SO8 & PDIP8) 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 Output Voltage Swing Output Voltage Swing Output Short Circuit Current Supply Current -3dB Bandwidth 0.1dB Bandwidth 1dB Bandwidth Peaking 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
[4] [4] [5] [6] [3] [1] [2]
Description
Conditions
Min
Typ -0.2 TBD
Max 2 3
Unit mV mV V/C A
-30
-21 0.2 TBD 2.2 1
A nA/C pF dB dB dB V V V mA
65 75 65 No load, RF = 1k RL = 100 3.5 2.8 80
81 96 100 3.8 3.1 100 10.1 175 34 150 0.4 12
Common Mode Rejection Ratio
mA MHz MHz MHz dB V/s % %
AC Performance - RG = 20, CL = 5pF
VOUT = 2VPP, measured at 20% to 80% Positive Negative
TBD 0.6 2.7
190
TBD 0.83 2.4 TBD TBD TBD TBD
ns nV/Hz pA/Hz dBc dBc dBc %
Total Harmonic Distortion Intermodulation Distortion
Measured by moving the supplies from 4V to 6V Measured by moving the inputs from +3.5V to -4.4V Pulse test only Frequency = 10MHz, VOUT = 1Vpk-pk, into 100 and 5pF load Frequency = 20MHz, VOUT = -20dBm (0.0274VRMS) into 500 and 15pF load Two-tone IMD, frequencies = 5MHz and 6MHz at -20dBm output level, RLOAD = 500 and 15pF
2
EL2125C - Preliminary
EL2125C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Electrical Characteristics
VS = 15V, TA = 25C, RF = 180, RG = 20, RL = 500 unless otherwise specified. Parameter DC Performance VOS TCVOS IB IOS TCIB CIN AVOL PSRR CMRR CMIR VOUT VOUTL IOUT IS BW BW 0.1dB BW 1dB Peaking SR OS TS VN IN HD2 HD3 THD IMD 1. 2. 3. 4. 5. 6. Input Offset Voltage (SO8 & PDIP8) 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 Output Voltage Swing Output Voltage Swing Output Short Circuit Current Supply Current -3dB Bandwidth 0.1dB Bandwidth 1dB Bandwidth Peaking 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
[4] [4] [5] [6] [3] [1] [2]
Description
Conditions
Min
Typ -0.2 TBD
Max 2 3
Unit mV mV V/C A
-30
-21 0.16 TBD 2.2 1
A nA/C pF dB dB dB V V V V
75 75 75 TBD No load, RF = 1k Positive, RF = 180, RL = 500 Negative 12.1 -11.3 100
86 95 100 13.5
Common Mode Rejection Ratio
150 10.8 220 23 63 2.5 12
mA mA MHz MHz MHz dB V/s % ns nV/Hz pA/Hz dBc dBc dBc %
AC Performance - RG = 20, CL = 5pF
VOUT = 2VPP, measured at 20% to 80%
TBD
225 0.6 TBD 0.95 2.1 TBD TBD TBD TBD
Total Harmonic Distortion Intermodulation Distortion
Measured by moving the supplies from 13.5V to 16.5V Measured by moving the inputs from +13.5V to -14.4V Pulse test only Frequency = 10MHz, VOUT = 1Vpk-pk, into 100 and 5pF load Frequency = 20MHz, VOUT = -20dBm (0.0274VRMS) into 500 and 15pF load Two-tone IMD, frequencies = 5MHz and 6MHz at -20dBm output level, RLOAD = 500 and 15pF
3
EL2125C - Preliminary
EL2125C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Typical Performance Curves
Non-Inverting Frequency Response for Various RF 5 VS=5V AV=10 RL=500 CL=5pF 5 Non-Inverting Frequency Response for Various RF VS=15V AV=10 RL=500 CL=5pF
RF=1k Normalized Gain (dB) RF=499 RF=180 RF=100
RF=700 RF=1k RF=180
Normalized Gain (dB)
0
0 RF=499 RF=100
-5 1M
10M
100M Frequency (Hz)
1G
-5 1M
10M
100M Frequency (Hz)
1G
Inverting Frequency Response for Various RF 6 RF=1k 2 Normalized Gain (dB) -2 -6 -10 -14 1M RF=350 RF=200 RF=97.6 Normalized Gain (dB) RF=499 2 -2 -6 -10 6
Inverting Frequency Response for Various RF
RF=1k
RF=499
RF=350 RF=200 RF=97.6 VS=15V AV=-10 CL=5pF 10M 100M Frequency (Hz) Non-Inverting Frequency Response for Various Gain 1G
VS=5V AV=-10 CL=5pF 10M 100M Frequency (Hz) 1G
-14 1M
Non-Inverting Frequency Response vs Gain 5 VS=5V RL=500 CL=5pF RG=20 5
Normalized Gain (dB)
0 AV=50 AV=20 AV=10
Normalized Gain (dB)
VS=15V RL=500 CL=5pF RF=700
0 AV=50 AV=20 AV=10
-5 1M
10M
100M Frequency (Hz)
1G
-5 1M
10M
100M Frequency (Hz)
1G
4
EL2125C - Preliminary
EL2125C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Typical Performance Curves
Inverting Frequency Response vs Gain 6 2 Normalized Gain (dB) -2 -6 -10 -14 1M -14 1M AV=-50 RF=1.75k AV=-20 RF=700k VS=5V RL=500 CL=5pF 6 Inverting Frequency Response vs Gain
Normalized Gain (dB)
AV=-10 RF=350k
0
AV=-10
AV=-50 VS=15V RL=500 CL=5pF RG=50 10M 100M Frequency (Hz)
AV=-20
10M
100M Frequency (Hz)
1G
1G
5
Non-Inverting Frequency Response for Various Output Signal Levels VS=5V AV=10 RF=180 RL= 500 CL=5pF
6
Inverting Frequency Response for Various Output Signal Levels
3mVPP 30mVPP 500mVPP Normalized Gain (dB) 0 3.3VPP 2.5VPP VS=5V AV=-10 RF=350 RL= 500 CL=5pF 10M 1VPP
250mVPP 500mVPP
Normalized Gain (dB)
0 4VPP
1VPP 2VPP -5 1M
10M
100M Frequency (Hz)
1G
-14 1M
100M Frequency (Hz)
1G
Non-Inverting Frequency Response for Various CL 5 3 Normalized Gain (dB) 1 CL=5pF -1 CL=1pF -3 -5 1M VS=5V AV=10 RF=180 RL=500 CL=28.5pF CL=16pF Normalized Gain (dB) 5
Non-Inverting Frequency Response for Various C L VS=5V AV=10 RF=700 RL=500
CL=17pF CL=11pF
0 CL=5pF CL=1.2pF
10M
100M Frequency (Hz)
1G
-5 1M
10M
100M Frequency (Hz)
1G
5
EL2125C - Preliminary
EL2125C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Typical Performance Curves
Inverting Frequency Response for Various C L 6 CL=29.4pF CL=16.4pF Normalized Gain (dB) CL=11.4pF CL=5.1pF CL=1.2pF VS=5V AV=10 RF=350 RL=500 -14 1M 10M 100M Frequency (Hz) 1G Normalized Gain (dB) 0 2 -2 -6 -10 -14 1M VS=15V AV=10 RF=500 RL=500 10M 100M Frequency (Hz) 1G 6 CL=29.4pF CL=16.4pF CL=11.4pF CL=5.1pF CL=1.2pF Inverting Frequency Response for Various C L
Open Loop Gain and Phase 100 80 Open Loop Gain (dB) 60 40 20 0 10k 250 12 150 50 -50 -150 -250 400M Supply Current (mA) 9.6 7.2 4.8 2.4 0
Supply Current vs Supply Voltage
Phase ()
100k
1M
10M
100M
0
3
6
9
12
15
Frequency (Hz) 3dB Bandwidth vs Supply Voltage 250 200 Bandwidth (MHz) 150 100 50 0 AV=-20 AV=20 AV=50 AV=-50 AV=10 AV=-10 3 2.5 2 1.5 1 0.5 2 4 6 8 10 12 14 16 0
Supply Voltage (V) Peaking vs Supply Voltage
Peaking (dB)
AV=10 AV=-10
AV=-20 2 4 6 8
AV=-50 10
AV=20 12
AV=50 14 16
VS (V)
VS (V)
6
EL2125C - Preliminary
EL2125C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Typical Performance Curves
Small Signal Step Response VS=5V RL=500 RF=180 AV=10 CL=5pF 20mV/div 20mV/div Small Signal Step Response VS=15V RL=500 RF=180 AV=10 CL=5pF
VINx2
VINx2
VO
VO
10ns/div
10ns/div
Large-Signal Step Response VS=5V RL=500 RF=180 AV=10 CL=5pF
Large-Signal Step Response VS=15V RL=500 RF=180 AV=10 CL=5pF
Output Voltage (0.5V/div)
Time (20ns/div)
Output Voltage (0.5V/div)
Time (20ns/div)
1MHz Harmonic Distortion vs Output Swing -40 -50 -60 Distortion (dBc) -70 -80 -90 -100 -110 0 1 2 3 4 5 6 7 3rd H VS=5V RF=180 AV=10 RL=500 Distortion (dBc) 2nd H -30 -40 -50 -60 -70 -80 -90 -100 -110
1MHz Harmonic Distortion vs Output Swing VS=15V RF=180 AV=10 RL=500
2nd H
3rd H
0
5
10
15
20
25
VOUT (VPP)
VOUT (VPP)
7
EL2125C - Preliminary
EL2125C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Typical Performance Curves
Total Harmonic Distortion vs Frequency VS=5V VO=2VPP AV=10 RF=180 RL=500 Voltage Noise (nV/Hz), Current Noise (pA/Hz) -30 -40 -50 THD (dBc) -60 -70 -80 -90 1k 100 Voltage and Current Noise vs Frequency
10 IN, VS=5V 1 VN, VS=15V VN, VS=5V IN, VS=15V
10k
100k
1M
10M
100M
0.1 10
100
1k Frequency (Hz)
10k
100k
Frequency (Hz) Settling Time vs Accuracy 60 50 Settling Time (ns) 40 30 20 10 0 0.1 VS=5V VO=2VPP VS=15V VO=2VPP VS=15V VO=5VPP Group Delay (ns) VS=5V VO=5VPP 14 10 6 2 -2 -6 AV=20 Group Delay VS=15V
AV=10
1 Accuracy (%)
10
1
10 Frequency (MHz)
100
400
CMRR -10 -30 -50 -70 -99 -110 10 110 90
PSRR
PSRRCMRR (dB) PSRR (dB) 70 PSRR+ 50 30 10 10K
100
1k
10k
100k
1M
10M
100M
100K
1M
10M
100M
600M
Frequency (Hz)
Frequency (Hz)
8
EL2125C - Preliminary
EL2125C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
Typical Performance Curves
Closed Loop Output Impedance vs Frequency 100 200 160 -3dB Bandwidth (MHz) Bandwidth 120 Peaking 80 40 0 -40 Bandwidth vs Temperature 3.5 3 2.5 2 1.5 1 0.5 0 40 80 120 160 0 Peaking (dB)
10 1
R out(3/4)
0.1
0.01 0.001 10k
100k
1M Frequency (Hz)
10M
100M
Temperature (C)
9
EL2125C - Preliminary
EL2125C - Preliminary
Ultra-low Noise, Low Power, Wideband Amplifier
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 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.
Printed in U.S.A.
October 2, 2001
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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