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EL2045C
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Features
100 MHz gain-bandwidth product Gain-of-2 stable Low supply current e 5 2 mA at VS e g15V Wide supply range e g2V to g18V dual-supply e 2 5V to 36V single-supply High slew rate e 275 V ms Fast settling e 80 ns to 0 1% for a 10V step Low differential gain e 0 02% at AV e a 2 RL e 150X Low differential phase e 0 07 at AV e a 2 RL e 150X Stable with unlimited capacitive load Wide output voltage swing e g13 6V with VS e g15V RL e 1000X e 3 8V 0 3V with VS e a 5V RL e 500X
General Description
The EL2045C is a high speed low power low cost monolithic operational amplifier built on Elantec's proprietary complementary bipolar process The EL2045C is gain-of-2 stable and features a 275 V ms slew rate and 100 MHz gain-bandwidth product while requiring only 5 2 mA of supply current The power supply operating range of the EL2045C is from g18V down to as little as g2V For single-supply operation the EL2045C operates from 36V down to as little as 2 5V The excellent power supply operating range of the EL2045C makes it an obvious choice for applications on a single a 5V or a 3V supply The EL2045C also features an extremely wide output voltage swing of g13 6V with VS e g15V and RL e 1000X At g5V output voltage swing is a wide g3 8V with RL e 500X and g3 2V with RL e 150X Furthermore for single-supply operation at a 5V output voltage swing is an excellent 0 3V to 3 8V with RL e 500X At a gain of a 2 the EL2045C has a b 3 dB bandwidth of 100 MHz with a phase margin of 50 It can drive unlimited load capacitance and because of its conventional voltage-feedback topology the EL2045C allows the use of reactive or nonlinear elements in its feedback network This versatility combined with low cost and 75 mA of output-current drive makes the EL2045C an ideal choice for price-sensitive applications requiring low power and high speed
Applications
Video amplifier Single-supply amplifier Active filters integrators High-speed sample-and-hold High-speed signal processing ADC DAC buffer Pulse RF amplifier Pin diode receiver Log amplifier Photo multiplier amplifier Difference amplifier
Connection Diagram
DIP and SO Package
December 1995 Rev C
Ordering Information
Part No EL2045CN EL2045CS Temp Range 0 C to a 75 C 0 C to a 75 C Package 8-Pin P-DIP 8-Lead SO Outline MDP0031 MDP0027
2045 - 1
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
1992 Elantec Inc
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Absolute Maximum Ratings (TA e 25 C)
Supply Voltage (VS) Peak Output Current (IOP) Output Short-Circuit Duration (Note 1) Input Voltage (VIN) Differential Input Voltage (dVIN)
g18V or 36V Short-Circuit Protected Infinite gVS g10V
Power Dissipation (PD) Operating Temperature Range (TA) Operating Junction Temperature (TJ) Storage Temperature (TST)
See Curves 0 C to a 75 C 150 C
b 65 C to a 150 C
Important Note All parameters having Min Max specifications are guaranteed The Test Level column indicates the specific device testing actually performed during production and Quality inspection Elantec performs most electrical tests using modern high-speed automatic test equipment specifically the LTX77 Series system Unless otherwise noted all tests are pulsed tests therefore TJ e TC e TA Test Level I II III IV V Test Procedure 100% production tested and QA sample tested per QA test plan QCX0002 100% production tested at TA e 25 C and QA sample tested at TA e 25 C TMAX and TMIN per QA test plan QCX0002 QA sample tested per QA test plan QCX0002 Parameter is guaranteed (but not tested) by Design and Characterization Data Parameter is typical value at TA e 25 C for information purposes only
DC Electrical Characteristics VS e g15V
Parameter VOS Description Input Offset Voltage Average Offset Voltage Drift Input Bias Current VS e g15V Condition
RL e 1000X unless otherwise specified Temp 25 C TMIN TMAX Min Typ Max Test Level Units 05 70 90 10 0 28 82 92 28 50 300 400 50 03 1500 3000 I III V I III V I III V V I III 2500 1750 65 60 85 V V I III mV mV mV C mA mA mA nA nA nA nA C VV VV VV TD is 3 5in VV dB dB
TCVOS IB
(Note 2) VS e g15V
All 25 C TMIN TMAX
VS e g5V IOS Input Offset Current VS e g15V
25 C 25 C TMIN TMAX
VS e g5V TCIOS AVOL Average Offset Current Drift (Note 2)
25 C All 25 C
Open-Loop Gain VS e g15V VOUT e g10V RL e 1000X
TMIN TMAX 1500 VS e g5V VOUT e g2 5V RL e 500X VS e g5V VOUT e g2 5V RL e 150X PSRR Power Supply Rejection Ratio VS e g5V to g15V 25 C 25 C 25 C TMIN TMAX
2
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
DC Electrical Characteristics VS e g15V
Parameter CMRR Description Common-Mode Rejection Ratio Common-Mode Input Range Condition VCM e g12V VOUT e 0V RL e 1000X unless otherwise specified Temp 25 C TMIN TMAX VS e g15V VS e g5V VS e a 5V VOUT Output Voltage Swing VS e g15V RL e 1000X 25 C 25 C 25 C 25 C TMIN TMAX VS e g15V RL e 500X VS e g5V RL e 500X VS e g5V RL e 150X VS e a 5V RL e 500X 25 C 25 C 25 C 25 C TMIN TMAX ISC Output Short Circuit Current Supply Current VS e g15V No Load 25 C TMIN TMAX 25 C TMIN TMAX VS e g5V No Load RIN Input Resistance Differential Common-Mode CIN ROUT PSOR Input Capacitance Output Resistance Power-Supply Operating Range AV e a 2 AV e a 2 Dual-Supply Single-Supply 10 MHz 25 C 25 C 25 C 25 C 25 C 25 C 25 C
g2 0 g13 4 g13 1 g12 0 g3 4 g13 4 g3 8 g3 2
Contd
Test Level I III Units dB dB V V V V V V V V V V mA mA mA mA mA kX MX pF TD is 4 5in TD is 1 9in mX V V
Min 70 70
Typ 95
Max
CMIR
g14 0 g4 2
V V V I III I IV V I III
42 01
g13 6
36 04 35 05 40 35
38 03
75
I III
IS
52
7 76
I III V V V V V
50 150 15 10 50
g18 0
V V
25
36 0
Closed-Loop AC Electrical Characteristics
VS e g15V AV e a 2 Rf e Rg e 1 kX Cf e 3 pF RL e 1000X unless otherwise specified Parameter BW Description
b 3 dB Bandwidth (VOUT e 0 4 VPP)
Condition VS e g15V AV e a 2 VS e g15V AV e b1 VS e g15V AV e a 5 VS e g15V AV e a 10 VS e g15V AV e a 20 VS e g5V AV e a 2
Temp 25 C 25 C 25 C 25 C 25 C 25 C 25 C 25 C 25 C
Min
Typ 100 75 20 10 5 75 100 75 50
Max
Test Level V V V V V V V V V
Units MHz MHz MHz MHz MHz MHz MHz MHz
GBWP
Gain-Bandwidth Product
VS e g15V VS e g5V
PM
Phase Margin
RL e 1 kX CL e 10 pF 3
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Closed-Loop AC Electrical Characteristics
VS e g15V AV e a 2 Rf e Rg e 1 kX Cf e 3 pF RL e 1000X unless otherwise specified Parameter SR Description Slew Rate (Note 3) Condition VS e g15V RL e 1000X VS e g5V RL e 500X FPBW Full-Power Bandwidth (Note 4) Rise Time Fall Time Overshoot Propagation Delay Settling to a 0 1% (AV e a 2) Differential Gain (Note 5) Differential Phase (Note 5) Input Noise Voltage Input Noise Current Load Capacitance Stability VS e g15V 10V Step VS e g5V 5V Step NTSC PAL NTSC PAL 10 kHz 10 kHz AV e a 2 VS e g15V VS e g5V 0 1V Output Step 0 1V Output Step Temp 25 C 25 C 25 C 25 C 25 C 25 C 25 C 25 C 25 C 25 C 25 C 25 C 25 C 25 C 32 Min 200 Typ 275 200 44 12 7 30 20 25 80 60 0 02 0 07 15 0 1 50 Infinite
Contd
Max Test Level I V I V V V V V V V V TD is 2 8in V V V nV 0Hz pA 0Hz pF Units V ms V ms MHz MHz ns % ns ns ns %
tr tf OS tPD ts
dG dP eN iN CI STAB Note Note Note Note 1 2 3 4
A heat-sink is required to keep junction temperature below absolute maximum when an output is shorted Measured from TMIN to TMAX Slew rate is measured on rising edge For VS e g15V VOUT e 20 VPP For VS e g5V VOUT e 5 VPP Full-power bandwidth is based on slew rate measurement using FPBW e SR (2q Vpeak) Note 5 Video Performance measured at VS e g15V AV e a 2 with 2 times normal video level across RL e 150X This corresponds to standard video levels across a back-terminated 75X load For other values of RL see curves
EL2045C Test Circuit
2045 - 2
4
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Typical Performance Curves
(TA e 25 C Rf e 1 kX Cf e 3 pF RL e 1000X AV e a 2 unless otherwise specified)
Non-Inverting Frequency Response Inverting Frequency Response Frequency Response for Various Load Resistances
Open-Loop Gain and Phase vs Frequency
Output Voltage Swing vs Frequency
Equivalent Input Noise
CMRR PSRR and Closed-Loop Output Resistance vs Frequency
2nd and 3rd Harmonic Distortion vs Frequency
Settling Time vs Output Voltage Change
Supply Current vs Supply Voltage
Common-Mode Input Range vs Supply Voltage
Output Voltage Range vs Supply Voltage
2045 - 3
5
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Typical Performance Curves
(TA e 25 C Rf e 1 kX Cf e 3 pF RL e 1000X AV e a 2 unless otherwise specified)
Gain-Bandwidth Product vs Supply Voltage Open-Loop Gain vs Supply Voltage
Contd
Slew-Rate vs Supply Voltage
Bias and Offset Current vs Input Common-Mode Voltage
Open-Loop Gain vs Load Resistance
Voltage Swing vs Load Resistance
Offset Voltage vs Temperature
Bias and Offset Current vs Temperature
Supply Current vs Temperature
Gain-Bandwidth Product vs Temperature
Open-Loop Gain PSRR and CMRR vs Temperature
Slew Rate vs Temperature
2045 - 4
6
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Typical Performance Curves
(TA e 25 C Rf e 1 kX Cf e 3 pF RL e 1000X AV e a 2 unless otherwise specified)
Short-Circuit Current vs Temperature Gain-Bandwidth Product vs Load Capacitance
Contd
Overshoot vs Load Capacitance
Small-Signal Step Response
Large-Signal Step Response
2045 - 5
2045 - 6
2045 - 7
Differential Gain and Phase vs DC Input Offset at 3 58 MHz
Differential Gain and Phase vs DC Input Offset at 4 43 MHz
Differential Gain and Phase vs Number of 150X Loads at 3 58 MHz
Differential Gain and Phase vs Number of 150X Loads at 4 43 MHz
8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature
8-Lead SO Maximum Power Dissipation vs Ambient Temperature
2045 - 8
7
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Simplified Schematic
2045 - 9
8
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Burn-In Circuit
Gain-Bandwidth Product and the b 3 dB Bandwidth
The EL2045C has a gain-bandwidth product of 100 MHz while using only 5 2 mA of supply current For gains greater than 4 its closed-loop b 3 dB bandwidth is approximately equal to the gain-bandwidth product divided by the noise gain of the circuit For gains less than 4 higherorder poles in the amplifier's transfer function contribute to even higher closed loop bandwidths For example the EL2045C has a b 3 dB bandwidth of 100 MHz at a gain of a 2 dropping to 20 MHz at a gain of a 5 It is important to note that the EL2045C has been designed so that this ``extra'' bandwidth in low-gain applications does not come at the expense of stability As seen in the typical performance curves the EL2045C in a gain of a 2 only exhibits 1 0 dB of peaking with a 1000X load
2045 - 10
All Packages Use the Same Schematic
Applications Information
Product Description
The EL2045C is a low-power wideband gain-of-2 stable monolithic operational amplifier built on Elantec's proprietary high-speed complementary bipolar process The EL2045C uses a classical voltage-feedback topology which allows it to be used in a variety of applications where currentfeedback amplifiers are not appropriate because of restrictions placed upon the feedback element used with the amplifier The conventional topology of the EL2045C allows for example a capacitor to be placed in the feedback path making it an excellent choice for applications such as active filters sample-and-holds or integrators Similarly because of the ability to use diodes in the feedback network the EL2045C is an excellent choice for applications such as fast log amplifiers
Video Performance
An industry-standard method of measuring the video distortion of a component such as the EL2045C is to measure the amount of differential gain (dG) and differential phase (dP) that it introduces To make these measurements a 0 286 VPP (40 IRE) signal is applied to the device with 0V DC offset (0 IRE) at either 3 58 MHz for NTSC or 4 43 MHz for PAL A second measurement is then made at 0 714V DC offset (100 IRE) Differential gain is a measure of the change in amplitude of the sine wave and is measured in percent Differential phase is a measure of the change in phase and is measured in degrees For signal transmission and distribution a backterminated cable (75X in series at the drive end and 75X to ground at the receiving end) is preferred since the impedance match at both ends will absorb any reflections However when double termination is used the received signal is halved therefore a gain of 2 configuration is typically used to compensate for the attenuation The EL2045C has been designed as an economical solution for applications requiring low video distortion It has been thoroughly characterized
Single-Supply Operation
The EL2045C has been designed to have a wide input and output voltage range This design also makes the EL2045C an excellent choice for single-supply operation Using a single positive supply the lower input voltage range is within 100 mV of ground (RL e 500X) and the lower output voltage range is within 300 mV of ground Upper input voltage range reaches 4 2V and output voltage range reaches 3 8V with a 5V supply and RL e 500X This results in a 3 5V output swing on a single 5V supply This wide output voltage range also allows single-supply operation with a supply voltage as high as 36V or as low as 2 5V On a single 2 5V supply the EL2045C still has 1V of output swing
9
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
Contd for video performance in the topology described above and the results have been included as typical dG and dP specifications and as typical performance curves In a gain of a 2 driving 150X with standard video test levels at the input the EL2045C exhibits dG and dP of only 0 02% and 0 07 at NTSC and PAL Because dG and dP can vary with different DC offsets the video performance of the EL2045C has been characterized over the entire DC offset range from b 0 714V to a 0 714V For more information refer to the curves of dG and dP vs DC Input Offset The output drive capability of the EL2045C allows it to drive up to 2 back-terminated loads with good video performance For more demanding applications such as greater output drive or better video distortion a number of alternatives such as the EL2120 EL400 or EL2074 should be considered
Applications Information
though stable with all capacitive loads some peaking still occurs as load capacitance increases A series resistor at the output of the EL2045C can be used to reduce this peaking and further improve stability
Printed-Circuit Layout
The EL2045C is well behaved and easy to apply in most applications However a few simple techniques will help assure rapid high quality results As with any high-frequency device good PCB layout is necessary for optimum performance Ground-plane construction is highly recommended as is good power supply bypassing A 0 1 mF ceramic capacitor is recommended for bypassing both supplies Lead lengths should be as short as possible and bypass capacitors should be as close to the device pins as possible For good AC performance parasitic capacitances should be kept to a minimum at both inputs and at the output Resistor values should be kept under 5 kX because of the RC time constants associated with the parasitic capacitance Metal-film and carbon resistors are both acceptable use of wire-wound resistors is not recommended because of their parasitic inductance Similarly capacitors should be low-inductance for best performance
Output Drive Capability
The EL2045C has been designed to drive low impedance loads It can easily drive 6 VPP into a 150X load This high output drive capability makes the EL2045C an ideal choice for RF IF and video applications Furthermore the current drive of the EL2045C remains a minimum of 35 mA at low temperatures The EL2045C is current-limited at the output allowing it to withstand shorts to ground However power dissipation with the output shorted can be in excess of the power-dissipation capabilities of the package
The EL2045C Macromodel
This macromodel has been developed to assist the user in simulating the EL2045C with surrounding circuitry It has been developed for the PSPICE simulator (copywritten by the Microsim Corporation) and may need to be rearranged for other simulators It approximates DC AC and transient response for resistive loads but does not accurately model capacitive loading This model is slightly more complicated than the models used for low-frequency op-amps but it is much more accurate for AC analysis The model does not simulate these characteristics accurately noise settling-time CMRR PSRR non-linearities temperature effects manufacturing variations
Capacitive Loads
For ease of use the EL2045C has been designed to drive any capacitive load However the EL2045C remains stable by automatically reducing its gain-bandwidth product as capacitive load increases Therefore for maximum bandwidth capacitive loads should be reduced as much as possible or isolated via a series output resistor (Rs) Similarly coax lines can be driven but best AC performance is obtained when they are terminated with their characteristic impedance so that the capacitance of the coaxial cable will not add to the capacitive load seen by the amplifier Al-
10
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
EL2045C Macromodel
Connections
a input
Contd
Models
l l l l l
subckt M2045 Input stage ie 7 37 0 9mA r6 36 37 400 r7 38 37 400 rc1 4 30 850 rc2 4 39 850 q1 30 3 36 qp q2 39 2 38 qpa ediff 33 0 39 30 1 0 rdiff 33 0 1Meg Compensation Section ga 0 34 33 0 1m rh 34 0 2Meg ch 34 0 1 5pF rc 34 40 1K cc 40 0 1pF Poles ep 41 0 40 0 1 rpa 41 42 200 cpa 42 0 2pF rpb 42 43 200 cpb 43 0 2pF Output Stage ios1 7 50 1 0mA ios2 51 4 1 0mA q3 4 43 50 qp q4 7 43 51 qn q5 7 50 52 qn q6 4 51 53 qp ros1 52 6 25 ros2 6 53 25 Power Supply Current ips 7 4 2 7mA 3
b input
l l l l
2
a Vsupply
l l l
7
b Vsupply
l l
4
output
l
6
model qn npn(is e 800Eb18 bf e 200 tf e 0 2nS) model qpa pnp(is e 864Eb18 bf e 100 tf e 0 2nS) model qp pnp(is e 800Eb18 bf e 125 tf e 0 2nS) ends
11
TD is 0 7in
TAB WIDE
TD is 0 7in
EL2045C
EL2045C
Low-Power 100 MHz Gain-of-2 Stable Operational Amplifier
EL2045C Macromodel
Contd
2045 - 11
EL2045C Model 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
December 1995 Rev C
Elantec Inc 1996 Tarob Court Milpitas CA 95035 Telephone (408) 945-1323 (800) 333-6314 Fax (408) 945-9305 European Office 44-71-482-4596
12
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
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