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EL2360C
EL2360C
Triple 130 MHz Current Feedback Amplifier
Features
Triple amplifier topology 130 MHz b 3 dB bandwidth (AV e a 2) 180 MHz b 3 dB bandwidth (AV e a 1) Wide supply range g2V to
g15V
General Description
The EL2360C is a triple current-feedback operational amplifier which achieves a b 3 dB bandwidth of 130 MHz at a gain of a 2 Built using the Elantec proprietary monolithic complementary bipolar process these amplifiers use current mode feedback to achieve more bandwidth at a given gain than a conventional voltage feedback amplifier The EL2360C is designed to drive a double terminated 75X coax cable to video levels It's fast slew rate of 1500 V ms combined with the triple amplifier topology makes its ideal for RGB video applications This amplifier can operate on any supply voltage from 4V (g2V) to 33V (g16 5V) yet consume only 8 mA per amplifier at any supply voltage The EL2360C is available in 16-pin PDIP and SOIC packages For Single Dual or Quad applications consider the EL2160C EL2260C or EL2460C all in industry standard pin outs For Single applications with a power down feature consider the EL2166C

80 mA output current (peak) Low cost 1500 V ms slew rate Input common mode range to within 1 5V of supplies 35 ns settling time to 0 1% Available in single (EL2160C) dual (EL2260C) and quad (EL2460C) form
Applications
RGB amplifiers Video amplifiers Cable driver Test equipment amplifiers Current to voltage converters Video broadcast equipment
Connection Diagram
EL2360C SOIC P-DIP Packages
Ordering Information
Part No Temp Range Package Outline EL2360CN b 40 C to a 85 C 16 b Pin PDIP MDP0031 EL2360CS b 40 C to a 85 C 16 b Pin SOIC MDP0027
June 1996 Rev A
2360 - 1
Top View
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
1996 Elantec Inc
EL2360C
Triple 130 MHz Current Feedback Amplifier
Absolute Maximum Ratings (TA e 25 C)
Voltage between VS a and VSb Common-Mode Input Voltage Differential Input Voltage Current into a IN or bIN Internal Power Dissipation
a 33V VSb to VS a
g6V g10 mA
Output Current (continuous) Operating Ambient Temperature Range Operating Junction Temperature Storage Temperature Range
g50 mA
b 40 C to a 85 C
150 C
b 65 C to a 150 C
See Curves
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 TCVOS
a IIN b IIN
RL e 150X TA e 25 C unless otherwise specified Conditions Min Typ 2 10 Max 10 Test Level I V 3 25 I I I 5 I I 5 I I I I V V V V Units mV mV C mA mA dB mA V dB mA V kX kX MX pF TD is 3 4in pF V V
Description Input Offset Voltage Average Input Offset Voltage Drift (Note 1)
a Input Current b Input Current
VS e g5V g15V
VS e g5V g15V VS e g5V g15V VS e g5V g15V VS e g5V g15V 75 50
05 5 55 02 95 02
CMRR
b ICMR
Common Mode Rejection Ratio (Note 2)
b Input Current Common
Mode Rejection (Note 2) PSRR
b IPSR
Power Supply Rejection Ratio (Note 3)
b Input Current Power
Supply Rejection (Note 3) ROL Transimpedance (Note 4) VS e g15V RL e 400X VS e g15V RL e 150X
a RIN a CIN a Input Resistance a Input Capacitance
500 500 15
2000 1800 3 15 1
g13 5 g3 5
PDIP package SOIC package
CMIR
Common Mode Input Range
VS e g15V VS e g5V
Note Note Note Note
1 2 3 4
Measured from TMIN to TMAX VCM e g10V for VS e g15V VCM e g3V for VS e g5V The supplies are moved from g2 5V to g15V VOUT e g7V for VS e g15V VOUT e g2V for VS e g5V
2
EL2360C
Triple 130 MHz Current Feedback Amplifier
DC Electrical Characteristics VS e g15V
Parameter VO Description Output Voltage Swing RL e 150X TA e 25 C unless otherwise specified Min
g12
Contd
Units V V V TD is 1 5in TD is 3 0in mA mA mA
Conditions VS e g15V RL e 400X VS e g15V RL e 150X VS e g5V RL e 150X
Typ
g13 5 g12
Max
Test Level I V I
g3 0
g3 7
ISC IS
Output Short Circuit Current (Note 5) Supply Current (per amplifier)
VS e g5V g15V VS e g15V VS e g5V
60
100 80 57
150 11 3 88
I I I
Note 5 A heat sink is required to keep junction temperature below absolute maximum when an output is shorted
AC Electrical Characteristics (Note 8)
unless otherwise specified Parameter BW Description
b 3 dB Bandwidth
VS e g15V AV e a 2 RF e RG e 560X RL e 150X TA e 25 C
Conditions VS e g15V AV e a 2 VS e g15V AV e a 1 VS e g5V AV e a 2 VS e g5V AV e a 1
Min
Typ 130 180 100 110
Max
Test Level V V V V IV V V V V V V V V V
Units MHz MHz MHz MHz V ms V ms ns ns % ns % %
SR
Slew Rate (Note 6)
RL e 400X RF e 1 kX RG e 110X RL e 400X
1000
1500 1500 27 32 0 35 0 025 0 006 01 0 005
tr tf tPD OS tS dG
Rise Time Fall Time Propagation Delay Overshoot 0 1% Settling Time Differential Gain (Note 7)
VOUT e g500 mV VOUT e g500 mV VOUT e g500 mV VOUT e g2 5V AV e b1 RL e 150X RL e 500X
dP
Differential Phase (Note 7)
RL e 150X RL e 500X
Note 6 Slew Rate is with VOUT from a 10V to b10V and measured at a 5V and b5V Note 7 DC offset from b0 714V to a 0 714V AC amplitude 286 mVPbP f e 3 58 MHz Note 8 All AC tests are performed on a ``warmed up'' part except Slew Rate which is pulse tested
3
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Non-Inverting Frequency Response (Gain) Non-Inverting Frequency Response (Phase) Frequency Response for Various RL
Inverting Frequency Response (Gain)
Inverting Frequency Response (Phase)
Frequency Response for Various RF and RG
3 dB Bandwidth vs Supply Voltage for AV e b 1
Peaking vs Supply Voltage for AV e b 1
3 dB Bandwidth vs Temperature for AV e b 1
2360 - 2
4
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
3 dB Bandwidth vs Supply Voltage for AV e a 1
Contd
Peaking vs Supply Voltage for AV e a 1
3 dB Bandwidth vs Temperature for AV e a 1
3 dB Bandwidth vs Supply Voltage for AV e a 2
Peaking vs Supply Voltage for AV e a 2
3 dB Bandwidth vs Temperature for AV e a 2
3 dB Bandwidth vs Supply Voltage for AV e a 10
Peaking vs Supply Voltage for AV e a 10
3 dB Bandwidth vs Temperature for AV e a 10
2360 - 3
5
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Frequency Response for Various CL
Contd
Channel to Channel Isolation vs Frequency
Frequency Response for Various CIN b
PSRR and CMRR vs Frequency
2nd and 3rd Harmonic Distortion vs Frequency
Transimpedance (ROL) vs Frequency
Voltage and Current Noise vs Frequency
Closed-Loop Output Impedance vs Frequency
Transimpedance (ROL) vs Die Temperature
2360 - 4
6
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Offset Voltage vs Die Temperature (4 Samples)
Contd
Supply Current vs Supply Voltage (Per Amplifier)
Supply Current vs Die Temperature (Per Amplifier)
a Input Resistance vs Die Temperature
Input Current vs Die Temperature
a Input Bias Current vs Input Voltage
Output Voltage Swing vs Die Temperature
Short Circuit Current vs Die Temperature
PSRR CMRR vs Die Temperature
2360 - 5
7
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Differential Gain vs DC Input Voltage RL e 150
Contd
Differential Phase vs DC Input Voltage RL e 150
Small Signal Pulse Response
Differential Gain vs DC Input Voltage RL e 500
Differential Phase vs DC Input Voltage RL e 500
Large Signal Pulse Response
Slew Rate vs Supply Voltage
Slew Rate vs Temperature
2360 - 6
8
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Contd
Settling Time vs Settling Accuracy
Long Term Settling Error
2360 - 16 2360 - 15
16-Lead Plastic SO Maximum Power Dissipation vs Ambient Temperature
16-Lead Plastic DIP Maximum Power Dissipation vs Ambient Temperature
2360 - 7
2360 - 8
9
EL2360C
Triple 130 MHz Current Feedback Amplifier
Differential Gain And Phase Test Circuit
2360 - 9
Simplified Schematic (One Amplifier)
2360 - 10
10
EL2360C
Triple 130 MHz Current Feedback Amplifier
Applications Information
Product Description
The EL2360C is a triple current feedback amplifier that offers wide bandwidth and good video specifications at moderately low supply currents It is built using Elantec's proprietary complimentary bipolar process and is offered in both a 16 pin PDIP and SOIC packages Due to the current feedback architecture the EL2360C closed b loop b 3 dB bandwidth is dependent on the value of the feedback resistor First the desired bandwidth is selected by choosing the feedback resistor RF and then the gain is set by picking a gain resistor RG The curves at the beginning of the Typical Performance Curves section show the effect of varying both RF and RG The b 3 dB bandwidth is somewhat dependent on the power supply voltage As the supply voltage is decreased internal junction capacitances increase causing a reduction in the closed loop bandwidth To compensate for this smaller values of feedback resistor can be used at lower supply voltages
Capacitance at the Inverting Input
Any manufacturer's high-speed voltage- or current-feedback amplifier can be affected by stray capacitance at the inverting input The characteristic curve of gain vs frequency with variations in CIN b emphasizes this effect The curve illustrates how the bandwidth can be extended to beyond 200 MHz with some additional peaking with an additional 2pF of capacitance at the VIN b pin For inverting gains this parasitic capacitance has little effect because the inverting input is a virtual ground but for non-inverting gains this capacitance (in conjunction with the feedback and gain resistors) creates a pole in the feedback path of the amplifier This pole if low enough in frequency has the same destabilizing effect as a zero in the forward open-loop response The use of large value feedback and gain resistors further exacerbates the problem by further lowering the pole frequency
Feedback Resistor Values
The EL2360C has been designed and specified at a gain of a 2 with RF e 560X This value of feedback resistor yields relatively flat frequency response with little to no peaking out to 130 MHz Since the EL2360C is a current-feedback amplifier it is also possible to change the value of RF to get more bandwidth As seen in the curve of Frequency Response For Various RF and RG bandwidth and peaking can be easily modified by varying the value of the feedback resistor For example by reducing RF to 430X bandwidth can be extended to 170 MHz with under 1 dB of peaking Further reduction of RF to 360X increases the bandwidth to 195 MHz with about 2 5 dB of peaking
Power Supply Bypassing and Printed Circuit Board Layout
As with any high-frequency device good printed circuit board layout is necessary for optimum performance Ground plane construction is highly recommended Lead lengths should be as short as possible preferably below '' The power supply pins must be well bypassed to reduce the risk of oscillation The combination of a 1 0 mF tantalum capacitor in parallel with a 0 01 mF ceramic capacitor has been shown to work well when placed at each supply pin For good AC performance parasitic capacitance should be kept to a minimum especially at the inverting input (see the Capacitance at the Inverting Input section) This implies keeping the ground plane away from this pin Carbon or Metal-Film resistors are acceptable with the MetalFilm resistors giving slightly less peaking and bandwidth because of their additional series inductance Use of sockets particularly for the SO package should be avoided if possible Sockets add parasitic inductance and capacitance which will result in some additional peaking and overshoot
11
Bandwidth vs Temperature
Whereas many amplifier's supply current and consequently b 3 dB bandwidth drop off at high temperature the EL2360C was designed to have little supply current variation with temperature An immediate benefit from this is that the b 3 dB bandwidth does not drop off drastically with temperature With VS e g15V and AV e a 2 the bandwidth varies only from 150 MHz to 110 MHz over the entire die junction temperature range of b 50 C k T k 150 C
EL2360C
Triple 130 MHz Current Feedback Amplifier
Applications Information
Contd caused by a power dissipation differential (before and after the voltage step) For AV e b 1 due to the inverting mode configuration this tail does not appear since the input stage does not experience the large voltage change as in the non-inverting mode With AV e b 1 0 01% settling time is slightly greater than 100 ns
Supply Voltage Range and Single Supply Operation
The EL2360C has been designed to operate with supply voltages from g2V to g15V Optimum bandwidth slew rate and video characteristics are obtained at higher supply voltages However at g2V supplies the b 3 dB bandwidth at AV e a 2 is a respectable 70 MHz The following figure is an oscilloscope plot of the EL2360C at g2V supplies AV e a 2 RF e RG e 560X driving a load of 150X showing a clean g600 mV signal at the output
Power Dissipation
The EL2360C amplifier combines both high speed and large output current capability at a moderate supply current in very small packages It is possible to exceed the maximum junction temperature allowed under certain supply voltage temperature and loading conditions To ensure that the EL2360C remains within it's absolute maximum ratings the following discussion will help to avoid exceeding the maximum junction temperature The maximum power dissipation allowed in a package is determined according to 1
PDMAX e TJMAX b TAMAX iJA
1
2360 - 11
where TJMAX e Maximum Junction Temperature TAMAX e Maximum Ambient Temperature iJA e Thermal Resistance of the Package PDMAX e Maximum Power Dissipation in the Package The maximum power dissipation actually produced by an IC is the total quiescent supply current times the total power supply voltage plus the power in the IC due to the load or 2
PDMAX e N (VS ISMAX a (VS bVOUT) VOUT RL )
If a single supply is desired values from a 4V to a 30V can be used as long as the input common mode range is not exceeded When using a single supply be sure to either 1) DC bias the inputs at an appropriate common mode voltage and AC couple the signal or 2) ensure the driving signal is within the common mode range of the EL2360C which is typically 1 5V from each supply rail
Settling Characteristics
The EL2360C offers superb settling characteristics to 0 1% typically in the 35 ns to 40 ns range There are no aberrations created from the input stage which often cause longer settling times in other current feedback amplifiers The EL2360C is not slew rate limited therefore any size step up to g10V gives approximately the same settling time As can be seen from the Long Term Settling Error curve for AV e a 1 there is approximately a 0 035% residual which tails away to 0 01% in about 40 ms This is a thermal settling error
12
2
where Ne Number of amplifiers VS e Total Supply Voltage ISMAX e Maximum Supply Current per amplifier VOUT e Maximum Output Voltage of the Application RL e Load Resistance tied to Ground
EL2360C
Triple 130 MHz Current Feedback Amplifier
Applications Information
Contd
If we set the two PDMAX equations 1 and 2 equal to each other and solve for VS we can get a family of curves for various loads and output voltages according to 3
RL (TJMAX b TAMAX) VS e N iJA
a (VOUT)2
Current Limit
The EL2360C has internal current limits that protect the circuit in the event of an output being shorted to ground This limit is set at 100 mA nominally and reduces with the junction temperature At TJ e 150 C the current limits at about 65 mA If any one output is shorted to ground the power dissipation could be well over 1W and much greater if all outputs are shorted Heat removal is required in order for the EL2360C to survive an indefinite short
(IS RL) a VOUT
3
The figures below show total supply voltage VS vs RL for various output voltage swings for the PDIP and SOIC packages The curves assume WORST CASE conditions of TA e a 85 C and IS e 11 3 mA per amplifier The curves do not include heat removal or forcing air or the simple fact that the package will be attached to a circuit board which can also provide some form of heat removal Larger temperature and voltage ranges are possible with heat removal and forcing air past the part
Supply Voltage vs RL for Various VOUT (PDIP Package)
Driving Cables and Capacitive Loads
When used as a cable driver double termination is always recommended for reflection-free performance For those applications the back-termination series resistor will de-couple the EL2360C from the cable and allow extensive capacitive drive However other applications may have high capacitive loads without a back-termination resistor In these applications a small series resistor (usually between 5X and 50X) can be placed in series with the output to eliminate most peaking The gain resistor (RG) can then be chosen to make up for any gain loss which may be created by this additional resistor at the output In many cases it is also possible to simply increase the value of the feedback resistor (RF) to reduce the peaking
2360 - 12
Supply Voltage vs RL for Various VOUT (SOIC Package)
2360 - 13
13
EL2360C
Triple 130 MHz Current Feedback Amplifier
EL2360C Macromodel
EL2360C Macromodel Revision A June 1996 AC characteristics used Rf e Rg e 560 ohms Pin numbers reflect a standard single opamp a input Connections b input l a Vsupply l l Transimpedance Stage g1 0 18 17 0 1 0 rol 18 0 2Meg cdp 18 0 2 285pF Output Stage output q1 4 18 19 qp q2 7 18 20 qn q3 7 19 21 qn q4 4 20 22 qp r7 21 6 4 r8 22 6 4 ios1 7 19 2mA ios2 20 4 2mA Supply Current ips 7 4 2 5mA Error Terms ivos 0 23 2mA vxx 23 0 0V e4 24 0 3 0 1 0 e5 25 0 7 0 1 0 e6 26 0 4 0 b1 0 r9 24 23 562 r10 25 23 1K r11 26 23 1K Models model qn npn(is e 5eb15 bf e 100 tf e 0 1 ns) model qp pnp(is e 5eb15 bf e 100 tf e 0 1 ns) model dclamp d(is e 1eb30 ibv e 0 266 a bv e 2 24v n e 4) ends TD is 5 1in 4 8in TD is
l l l
l l l
l l l
b Vsupply
l l
4
l
6
subckt EL2360 EL Input Stage e1 10 0 3 0 1 0 vis 10 9 0V h2 9 12 vxx 1 0 r1 2 11 130 l1 11 12 25nH iinp 3 0 0 5mA iinm 2 0 5mA r12 3 0 2 Meg
3
2
7
Slew Rate Limiting h1 13 0 vis 600 r2 13 14 1K d1 14 0 dclamp d2 0 14 dclamp High Frequency Pole e2 30 0 14 0 0 00166666666 l3 30 17 0 43mH c5 17 0 0 27pF r5 17 0 500
14
EL2360C
Triple 130 MHz Current Feedback Amplifier
EL2360C Macromodel
Contd
2360 - 14
15
EL2360C
EL2360C
Triple 130 MHz Current Feedback 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
June 1996 Rev A
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
16
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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