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EL2260C EL2460C
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Features
130 MHz 3 dB bandwidth (AV e a 2) 180 MHz 3 dB bandwidth (AV e a 1) 0 01% differential gain RL e 500X 0 01 differential phase RL e 500X Low supply current 7 5 mA per amplifier Wide supply range g2V to g15V 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%
General Description
The EL2260C EL2460C are dual quad current feedback operational amplifiers with b 3 dB bandwidth of 130 MHz at a gain of a 2 Built using the Elantec proprietary monolithic complementary bipolar process these amplifers use current mode feedback to achieve more bandwidth at a given gain than a conventional voltage feedback operational amplifier The EL2260C EL2460C are designed to drive a double terminated 75X coax cable to video levels Differential gain and phase are excellent when driving both loads of 500X ( k 0 01% k 0 01 ) and double terminated 75X cables (0 025% 0 1 ) The amplifiers can operate on any supply voltage from 4V (g2V) to 33V (g16 5V) yet consume only 7 5 mA per amplifier at any supply voltage Using industry standard pinouts the EL2260C is available in 8-pin P-DIP and 8-pin SO packages while the EL2460C is available in 14-pin P-DIP and 14-pin SO packages Elantec's facilities comply with MIL-I-45208A and offer applicable quality specifications For information on Elantec's processing see the Elantec document QRA-1 Elantec's Processing Monolithic Products
Applications
Video amplifiers Cable drivers RGB amplifiers Test equipment amplifiers Current to voltage converter
Connection Diagrams
EL2260C SO P-DIP Packages EL2460C SO P-DIP Packages
Ordering Information
Part No Temp Range Package Outline MDP0031 MDP0027 EL2260CN b 40 C to a 85 C 8-Pin P-DIP EL2260CS b 40 C to a 85 C 8-Pin SOIC
EL2460CN b 40 C to a 85 C 14-Pin P-DIP MDP0031 EL2460CS b 40 C to a 85 C 14-Pin SOIC MDP0027
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Top View
January 1995 Rev B
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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
1992 Elantec Inc
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Absolute Maximum Ratings (TA e 25 C)
Voltage between VS a and VSb Voltage between a IN and bIN Current into a IN or bIN Internal Power Dissipation
a 33V
g6V
10 mA See Curves
Operating Ambient Temperature Range Operating Junction Temperature Plastic Packages Storage Temperature Range Output Current
b 40 C to a 85 C
150 C
b 65 C to a 150 C
g50 mA
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
Open Loop DC Electrical Characteristics
VS e g15V RL e 150X TA e 25 C unless otherwise specified Limits Parameter Description Conditions Temp Min VOS Input Offset Voltage VS e g5V g15V 25 C TMIN TMAX TC VOS
a IIN
Test Level Max 10 15 EL2260C EL2460C I III V 5 10 I III I III II 5 5 I III II 5 5 I III Units
Typ 2
mV mV mV C mA mA mA mA dB mA V mA V dB mA V mA V TD is 3 3in
Average Offset Voltage Drift (Note 1)
a Input Current
Full VS e g5V g15V 25 C TMIN TMAX
10 05
b IIN
b Input Current
VS e g5V g15V
25 C TMIN TMAX
5
25 35
CMRR
b ICMR
Common Mode Rejection Ratio (Note 2)
b Input Current Common Mode Rejection (Note 2)
VS e g5V g15V VS e g5V g15V
Full 25 C TMIN TMAX Full 25 C TMIN TMAX
50
55 02
PSRR
b IPSR
Power Supply Rejection Ratio (Note 3)
b Input Current Power Supply Rejection (Note 3)
75
95 02
2
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Open Loop DC Electrical Characteristics
VS e g15V RL e 150X TA e 25 C unless otherwise specified Limits Parameter Description Conditions Temp Min ROL Transimpedance (Note 4) VS e g15V RL e 400X VS e g5V RL e 150X
a RIN a CIN a Input Resistance a Input Capacitance
Contd
Test Level Max EL2260C EL2460C I III I III II V V V I III V I III 150 11 0 11 0 85 85 I I III I III Units
Typ 2000 1800 30 25
g13 5 g3 5
25 C TMIN TMAX 25 C TMIN TMAX Full 25 C
500 250 500 250 15
kX kX kX kX MX pF V V V V V V V mA mA mA mA mA
CMIR
Common Mode Input Range
VS e g15V VS e g5V
25 C 25 C 25 C TMIN TMAX 25 C 25 C TMIN TMAX 25 C 25 C TMIN TMAX 25 C TMIN TMAX
g3 0 g2 5 g12 g11
VO
Output Voltage Swing
RL e 400X VS e g15V RL e 150X VS e g15V RL e 150X VS e g5V
g13 5
g12 g3 7
ISC IS
Output Short Circuit Current (Note 5) Supply Current (Per Amplifier)
VS e g5V VS e g15V VS e g15V VS e g5V
60
100 75 54
3
TD is 3 8in
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Closed Loop AC Electrical Characteristics
VS e g15V AV e a 2 RF e 560X RL e 150X TA e 25 C unless otherwise noted Limits Parameter Description Test Conditions Min BW
b 3 dB Bandwidth (Note 8)
Test Level Max EL2260C EL2460C V V V V IV V V V V V V V V V Units
Typ 130 180 100 110
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
MHz MHz MHz MHz V ms V ms ns ns % ns % TD is 3 7in % deg ( ) deg ( )
SR
Slew Rate (Notes 6 8)
RL e 400X RF e 1KX RG e 110X RL e 400X VOUT e g500mV
1000
1500 1500 27 32
tr tf tpd OS ts dG
Rise Time Fall Time (Note 8) Propagation Delay (Note 8) Overshoot (Note 8) 0 1% Settling Time (Note 8) Differential Gain (Notes 7 8) Differential Phase (Notes 7 8)
VOUT e g500 mV VOUT e g10V AV e b1 RL e 1K RL e 150X RL e 500X RL e 150X RL e 500X
0 35 0 025 0 006 01 0 005
dP
Note 1 Measured from TMIN to TMAX Note 2 VCM e g10V for VS e g15V and TA e Full VCM e g3V for VS e g5V and TA e 25 C VCM e g2V for VS e g5V and TA e TMIN TMAX Note 3 The supplies are moved from g2 5V to g15V Note 4 VOUT e g7V for VS e g15V and VOUT e g2V for VS e g5V Note 5 A heat sink is required to keep junction temperature below absolute maximum when an output is shorted Note 6 Slew Rate is with VOUT from a 10V to b10V and measured at the 25% and 75% points Note 7 DC offset from b0 714V through a 0 714V AC amplitude 286 mVp-p f e 3 58 MHz Note 8 All AC tests are performed on a ``warmed up'' part except for Slew Rate which is pulse tested
4
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
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
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5
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
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
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6
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
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
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7
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
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
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8
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
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
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9
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Typical Performance Curves
Settling Time vs Settling Accuracy
Contd
14-Lead Plastic DIP Maximum Power Dissipation vs Ambient Temperature 14-Lead Plastic SO Maximum Power Dissipation vs Ambient Temperature
Long Term Settling Error
8-Lead Plastic DIP Maximum Power Dissipation vs Ambient Temperature
8-Lead Plastic SO Maximum Power Dissipation vs Ambient Temperature
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Burn-In Circuits
EL2260C
EL2460C
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10
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Differential Gain and Phase Test Circuit
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Simplified Schematic (One Amplifier)
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11
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Applications Information
Product Description
The EL2260C EL2460C are dual and quad current mode feedback amplifiers that offer wide bandwidths and good video specifications at moderately low supply currents They are built using Elantec's proprietary complimentary bipolar process and are offered in industry standard pin-outs Due to the current feedback architecture the EL2260C EL2460C closed-loop 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 the gain resistor RG The curves at the beginning of the Typical Performance Curves section show the effect of varying both RF and RG The 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 closed loop bandwidth To compensate for this smaller values of feedback resistor can be used at lower supply voltages
Capacitance at the Inverting Input
Due to the topology of the current feedback amplifier stray capacitance at the inverting input will affect the AC and transient performance of the EL2260C EL2460C when operating in the non-inverting configuration The characteristic curve of gain vs frequency with variations of 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 2 pF of capacitance at the VIN b pin for the case of AV e a 2 Higher values of capacitance will be required to obtain similar effects at higher gains In the inverting gain mode added capacitance at the inverting input has little effect since this point is at a virtual ground and stray capacitance is therefore not ``seen'' by the amplifier
Feedback Resistor Values
The EL2260C and EL2460C have been designed and specified with RF e 560X for AV e a 2 This value of feedback resistor yields extremely flat frequency response with little to no peaking out to 130 MHz As is the case with all current feedback amplifiers wider bandwidth at the expense of slight peaking can be obtained by reducing the value of the feedback resistor Inversely larger values of feedback resistor will cause rolloff to occur at a lower frequency 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 See the curves in the Typical Performance Curves section which show 3 dB bandwidth and peaking vs frequency for various feedback resistors and various supply voltages
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 below The power supply pins must be well bypassed to reduce the risk of oscillation A 1 0 mF tantalum capacitor in parallel with a 0 01 mF ceramic capacitor is adequate for each supply pin For good AC performance parasitic capacitances should be kept to a minimum especially at the inverting input (see Capacitance at the Inverting Input section) This implies keeping the ground plane away from this pin Carbon resistors are acceptable while use of wire-wound resistors should not be used because of their parasitic inductance Similarly capacitors should be low inductance for best performance Use of sockets particularly for the SO packages should be avoided Sockets add parasitic inductance and capacitance which will result in peaking and overshoot
Bandwidth vs Temperature
Whereas many amplifier's supply current and consequently 3 dB bandwidth drop off at high temperature the EL2260C EL2460C were designed to have little supply current variations with temperature An immediate benefit from this is that the 3 dB bandwidth does not drop off drastically with temperature With VS e g15V and AV e a 2 the bandwidth only varies from 150 MHz to 110 MHz over the entire die junction temperature range of 0 C k T k 150 C
12
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Applications Information
Supply Voltage Range
The EL2260C EL2460C 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 3 dB bandwidth at AV e a 2 is a respectable 70 MHz The following figure is an oscilloscope plot of the EL2260C 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 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 noninverting mode With AV e b 1 0 01% settling time is slightly greater than 100 ns
Power Dissipation
The EL2260C EL2460C amplifiers combine both high speed and large output current drive 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 EL2260C EL2460C remain within their 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 by its thermal resistance and the amount of temperature rise according to PDMAX e TJMAX b TAMAX iJA
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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 EL2260C EL2460C
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
PDMAX e N
2
VS IS a (VS b VOUT)
VOUT RL
J
Settling Characteristics
The EL2260C EL2460C offer 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 EL2260 EL2460 are 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
where N is the number of amplifiers per package and IS is the current per amplifier (To be more accurate the quiescent supply current flowing in the output driver transistor should be subtracted from the first term because under loading and due to the class AB nature of the output stage the output driver current is now included in the second term ) In general an amplifier's AC performance degrades at higher operating temperature and lower supply current Unlike some amplifiers such as the LT1229 and LT1230 the EL2260C EL2460C
13
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Applications Information
Contd maintain almost constant supply current over temperature so that AC performance is not degraded as much over the entire operating temperature range Of course this increase in performance doesn't come for free Since the current has increased supply voltages must be limited so that maximum power ratings are not exceeded The curves do not include heat removal or forcing air or the simple fact that the package will probably 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
Current Limit
The EL2260C EL2460C have internal current limits that protect the circuit in the event of the output being shorted to ground This limit is set at 100 mA nominally and reduces with junction temperature At a junction temperature of 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 EL2260C EL2460C to survive an indefinite short
Each amplifier in the EL2260C EL2460C consume typically 7 5 mA and maximum 10 0 mA The worst case power in an IC occurs when the output voltage is at half supply if it can go that far or its maximum value if it cannot reach half supply If we assume that the EL2260C EL2460C is used for double terminated video cable driving applications (RL e 150X) and the gain e a 2 then the maximum output voltage is 2V and the average output voltage is 1 4V If we set the two PDmax equations equal to each other and solve for VS we can get a family of curves for various packages and conditions according to RL (TJMAX b TAMAX) a (VOUT)2 N iJA VS e (2 IS RL) a VOUT The following curve shows supply voltage (gVS) vs temperature for the various packages assuming AV e a 2 RL e 150 and VOUT peak e 2V The curves include worst case conditions (IS e 10 mA and all amplifiers operating at VOUT peak e 2V)
Supply Voltage vs Ambient Temperature for All Packages of EL2260C EL2460C
Channel to Channel Isolation
Due to careful biasing connections within the internal circuitry of the EL2260C EL2460C exceptionally good channel to channel isolation is obtained Isolation is over 70 dB at video frequencies of 4 MHz and over 65 dB up to 10 MHz The EL2460C isolation is improved an additional 10 dB up to about 5 MHz for amplifiers A to B and amplifiers C to D Isolation is improved another 8 dB for amplifiers A to C and amplifiers B to D See the curve in the Typical Performance Curves section for more detail
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 decouple the EL2260C and EL2460C from the capacitive cable and allow extensive capacitive drive However other applications may have high capacitive loads without termination resistors In these applications an additional small value (5X -50X) resistor in series with the output will eliminate most peaking The gain resistor RG can be chosen to make up for the gain loss created by this additional series resistor at the output
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14
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
EL2260C EL2460C Macromodel
Revision A March 1993 AC Characteristics used CINb (pin 2) e 1 pF RF e 560X a input Connections b input l a Vsupply l l b Vsupply l l l output l l l l
TAB WIDE
l
subckt EL2260C EL 3 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 2Meg 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 Transimpedance Stage g1 0 18 17 0 1 0 ro1 18 0 2Meg cdp 18 0 2 285pF Output Stage 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
l
2
l
7
l
4
l
6
15
TD is 6 5in
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
EL2260C EL2460C Macromodel
Supply Current ips 7 4 2mA 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 1 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 1ns) model qp pnp (is e 5eb15 bf e 100 tf e 0 1ns) model dclamp d (is e 1eb30 ibv e 0 266 bv e 2 24 n e 4) ends TD is 2 6in
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Contd
16
BLANK
17
BLANK
18
BLANK
19
EL2260C EL2460C
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
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
January 1995 Rev B
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
20
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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