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EL4421C 22C 41C 42C 43C 44C
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Features
Unity or a 2-gain bandwidth of 80 MHz 70 dB off-channel isolation at 4 MHz Directly drives high-impedance or 75X loads 02% and 02 differential gain and phase errors 8 ns switching time k 100 mV switching glitch 0 2% loaded gain error Compatible with g3V to g15V supplies 160 mW maximum dissipation at g5V supplies
General Description
The EL44XX family of video multiplexed-amplifiers offers a very quick 8 ns switching time and low glitch along with very low video distortion The amplifiers have good gain accuracy even when driving low-impedance loads To save power the amplifiers do not require heavy loading to remain stable The EL4421 and EL4422 are two-input multiplexed amplifiers The -inputs of the input stages are wired together and the device can be used as a pin-compatible upgrade from the MAX453 The EL4441 and EL4442 have four inputs also with common feedback These may be used as upgrades of the MAX454 The EL4443 and EL4444 are also 4-input multiplexed amplifiers but both positive and negative inputs are wired separately A wide variety of gain- and phase-switching circuits can be built using independent feedback paths for each channel The EL4421 EL4441 and EL4443 are internally compensated for unity-gain operation The EL4422 EL4442 and EL4444 are compensated for gains of a 2 or more especially useful for driving back-matched cables The amplifiers have an operational temperature of b 40 C to a 85 C and are packaged in plastic 8- and 14-pin DIP and 8- and 14-pin SO The EL44XX multiplexed-amplifier family is fabricated with Elantec's proprietary complementary bipolar process which gives excellent signal symmetry and is very rugged
Ordering Information
Part No Temp Range C to C to C to C to C to C to C to C to C to C to C to C to
a 85 a 85 a 85 a 85 a 85 a 85 a 85 a 85 a 85 a 85 a 85 a 85
Package
Outline MDP0031 MDP0027 MDP0031 MDP0027
EL4421CN b 40 EL4421CS b 40 EL4422CN b 40 EL4422CS b 40 EL4441CN b 40 EL4441CS b 40 EL4442CN b 40 EL4442CS b 40 EL4443CN b 40 EL4443CS b 40 EL4444CN b 40 EL4444CS b 40
C 8-Pin PDIP C 8-Pin SO C 8-Pin PDIP C 8-Pin SO
C 14-Pin PDIP MDP0031 C 14-Pin SO MDP0027 C 14-Pin PDIP MDP0031 C 14-Pin SO MDP0027 C 14-Pin PDIP MDP0031 C 14-Pin SO MDP0027 C 14-Pin PDIP MDP0031 C 14-Pin SO MDP0027
Connection Diagrams
EL4421 EL4422 EL4441 EL4442 EL4443 EL4444
January 1996 Rev C
4421 - 1
4421 - 2
4421 - 3
Manufactured under U S Patent No 5 352 987
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
1994 Elantec Inc
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Absolute Maximum Ratings
Va VS VIN DVIN Positive Supply Voltage V a to Vb Supply Voltage Voltage at any Input or Feedback Difference between Pairs of Inputs or Feedback 16 5V 33V V a to Vb 6V VLOGIC IIN IOUT PD Voltage at A0 or A1 Current into any Input Feedback or Logic Pin Output Current Maximum Power Dissipation
b 4V to 6V
4 mA 30 mA 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
Open-Loop DC Electrical Characteristics
Power supplies at g5V TA e 25 C RL e 500X unless otherwise specified Parameter VOS IB Description Input Offset Voltage 21 41 and 43 22 42 and 44 Min
b9 b7
Typ
g3 g2
Max 9 7 0
Test Level I I I
Units mV
Input Bias Current Positive Inputs Only of the 21 22 41 42 and All Inputs of the 43 and 44 Input Bias Currents of Common Feedback b 21 and 22 b 41 and 42 Input Offset Currents of the 43 and 44 Gain Error of the 21 and 41 and 43 (Note 1) 22 42 and 44 Open-Loop Gain (Note 1) EL4443 EL4444
b 12
b5
mA
IFB
b 24 b 48
b 10 b 20
0 0 350 06 06
I I I I I I I I I
mA mA nA % VV VV VV V dB TD is 3 3in
IOS EG AVOL VIN CMRR PSRR
60 02 01 350 500
g2 5
500 750
g3
Input Signal Range EL4421 and EL4441 (Note 2) Common-Mode Rejection Ratio EL4443 and EL4444 Power Supply Rejection Ratio Vs from g5V to g15V
70
90
60
70
I
dB
2
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Open-Loop DC Electrical Characteristics
Power supplies at g5V TA e 25 C Parameter CMIR VOUT ISC FT ILOGIC VLOGIC IS Description Common-Mode Input Range (Note 3) EL4443 and EL4444 Output Swing Output Short-Circuit Current Unselected Channel Feedthrough '21 '41 '43 Attenuation (Note 1) '22 '42 '44 Input Current at A0 and A1 with Input e 0V and 5V Logic Valid High and Low Input Levels Supply Current EL4421 and EL4422 EL4441 EL4442 EL4443 and EL4444 Min
g2 5 g2 5 g40
Contd
Typ Max Test Level I I I I I 0 20 11 13 14 16 I I I Units V V mA dB dB mA V mA TD is 2 2in TD is 2 6in
g3 g3 5 g80
70 55
b 16
80 64
b8
08
Note 1 The 21 41 and 43 devices are connected for unity-gain operation with 75X load and an input span of g1V The 22 42 and 44 devices are connected for a gain of a 2 with a 150X load and a g1V input span with RF e RG e 270X Note 2 The 21 and 41 devices are connected for unity gain with a g3V input span while the output swing is measured Note 3 CMIR is assured by passing the CMRR test at input voltage extremes
Closed-Loop AC Electrical Characteristics
Power supplies at g5V TA e 25 C for EL4421 EL4441 and EL4443 AV e a 1 and RL e 500X for EL4422 EL4442 and EL4444 AV e a 2 and RL e 150X with RF e RG e 270X and CF e 3 pF for all CL e 15 pF Parameter BW b 3 dB BW g 0 1 dB Peaking SR Description
b 3 dB Small-Signal Bandwidth EL4421 '41 '43 EL4422 '42 '44
Min
Typ 80 65 10 05
Max
Test Level V V V V I I V V V V V V
Units MHz MHz MHz dB V msec V msec nV rt-hz nV rt-hz % % % %
0 1 dB Flatness Bandwidth Frequency Response Peaking Slewrate VOUT between b2 5V and a 2 5V VS e g12V EL4421 EL4441 EL4443 EL4422 EL4442 EL4444 Input-Referred Noise Voltage Density EL4421 EL4441 EL4443 EL4422 EL4442 EL4444 Differential Gain Error VOFFSET between b0 7V and a 0 7V EL4421 EL4441 EL4443 (VS e g12V) EL4421 EL4441 EL4443 (VS e g5V) EL4422 EL4442 EL4444 (VS e g12V) EL4422 EL4442 EL4444 (VS e g5V) 150 180
200 240 18 14 0 01 0 10 0 02 0 11
Vn
dG
3
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Closed-Loop AC Electrical Characteristics
Power supplies at g5V TA e 25 C for EL4421 EL4441 and EL4443 AV e a 1 and RL e 500X for EL4422 EL4442 and EL4444 Contd AV e a 2 and RL e 150X with RF e RG e 270X and CF e 3 pF for all CL e 15 pF Parameter dO Description Differential Phase Error VOFFSET between b0 7V and a 0 7V EL4421 EL4441 EL4443 (VS e g12V) EL4421 EL4441 EL4443 (VS e g5V) EL4422 EL4442 EL4444 (VS e g12V) EL4422 EL4442 EL4444 (VS e g5V) Multiplex Delay Time Logic Threshold to 50% Signal Change EL4421 '22 EL4441 '42 '43 '44 Peak Multiplex Glitch EL4421 '22 EL4441 '42 '43 '44 Channel Off Isolation at 3 58 MHz (See Text) EL4421 EL4441 EL4443 EL4422 EL4442 EL4444 Min Typ Max Test Level V V V V V V V V V V nsec nsec mV mV dB dB TD is 2 4in Units
0 01 01 0 02 0 15 8 12 70 100 76 63
TMUX
VGLITCH
ISO
Typical Performance Curves
EL4421 EL4441 and EL4443 Small-Signal Transient Response VS e g5V RL e 500X EL4421 EL4441 and EL4443 Large-Signal Response VS e g12V RL e 500X
4421 - 5
4421 - 6
EL4421 EL4441 and EL4443 Frequency Response for Various Gains
EL4422 EL4442 and EL4444 Frequency Response for Various Gains
4421 - 7
4421 - 8
4
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Typical Performance Curves
Contd
EL4422 EL4442 and EL4444 Frequency Response for Various Loads VS e g5V AV e a 2
EL4421 EL4441 and EL4443 Frequency Response for Various Loads VS e g5V AV e a 1
4421 - 10
Frequency Response for Various Loads VS e g15V AV e a 1
4421 - 9
EL4422 EL4442 and EL4444 Frequency Response for Various Loads VS e g15V AV e a 2
4421 - 11
4421 - 12
EL4443 Open-Loop Gain and Phase vs Frequency
EL4444 Open-Loop Gain and Phase vs Frequency
4421 - 13
4421 - 37
5
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Typical Performance Curves
EL4421 EL4441 and EL4443 b 3 dB Bandwidth Slewrate and Peaking vs Supply Voltage
Contd
EL4422 EL4442 and EL4444 b 3 dB Bandwidth Slewrate and Peaking vs Supply Voltage
4421 - 14
4421 - 15
EL4421 EL4441 and EL4443 Bandwidth Slewrate and Peaking vs Temperature AV e a 1 RL e 500X
EL4422 EL4442 and EL4444 Bandwidth Slewrate and Peaking vs Temperature AV e a 2 RL e 150X RI e RG e 270X CF e 3 pF
4421 - 16
4421 - 17
EL4421 EL4441 and EL4443 b 3 dB Bandwidth and Gain Error vs Load Resistance
Input Noise vs Frequency
4421 - 18
4421 - 19
6
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Typical Performance Curves
EL4421 EL4441 and EL4443 Differential Gain and Phase Errors vs Input Offset AV e a 1 RL e 500X F e 3 58 MHz
Contd
EL4422 EL4442 and EL4444 Differential Gain and Phase Error vs Input Offset AV e a 2 RL e 150X F e 3 58 MHz
4421 - 20
4421 - 21
EL4421 EL4441 and EL4443 Differential Gain and Phase Error vs Load Resistance AV e a 1 F e 3 58 MHz VOFFSET e 0 714V
x0
EL4443 and EL4444 Open-Loop Gain vs Load Resistance
4421 - 22
4421 - 23
Change in VOS AV and IB with Supply Voltage
Change in VOS IB and AV vs Temperature
4421 - 24
4421 - 25
7
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Typical Performance Curves
Switching Waveforms Switching from Grounded Input to Uncorrelated Sinewave and Back
Contd
Channel-to-Channel Switching Glitch
4421 - 26
4421 - 27
EL4421 EL4441 and EL4443 Unselected Channel Feedthrough vs Frequency
EL4422 EL4442 and EL4444 Unselected Channel Feedthrough vs Frequency
4421 - 28
4421 - 29
EL4443 and EL4444 Input and Output Range vs Supply Voltage (Output Unloaded)
4421 - 30
8
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Typical Performance Curves
Supply Current vs Supply Voltage
Contd
Supply Current vs Temperature
8-Pin Package Power Dissipation vs Ambient Temperature
4421 - 31
14-Pin Package Power Dissipation vs Ambient Temperature
4421 - 32
4421 - 33
4421 - 34
Applications Information General Description
The EL44XX family of video mux-amps are composed of two or four input stages whose inputs are selected and control an output stage One of the inputs is active at a time and the circuit behaves as a traditional voltage-feedback op-amp for that input rejecting signals present at the unselected inputs Selection is controlled by one or two logic inputs The EL4421 EL4422 EL4441 and EL4442 have all b inputs wired in parallel allowing a single feedback network to set the gain of all inputs These devices are wired for positive gains The EL4443 and EL4444 on the other hand have all a inputs and b inputs brought out separately so that the input stage can be wired for independent gains and gain polarities with separate feedback networks The EL4421 EL4441 and EL4443 are compensated for unity-gain stability while the EL4422 EL4442 and EL4444 are compensated for a fedback gain of a 2 ideal for driving back-terminated cables or maintaining bandwidth at higher fed-back gains
9
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Applications Information Switching Characteristics
The logic inputs work with standard TTL levels of 0 8V or less for a logic 0 and 2 0V or more for a logic 1 making them compatible for TTL and Contd CMOS drivers The ground pin is the logic threshold biasing reference The simplified input circuitry is shown below
4421 - 35
Figure 1 Simplified Logic Input Circuitry
The ground pin draws a maximum DC current of 6 mA and may be biased anywhere between (V b ) a 2 5V and (V a ) b 3 5V The logic inputs may range from (V b ) a 2 5V to V a and are additionally required to be no more negative than
V(Gnd pin) b 4V and no more positive than V(Gnd pin) a 6V For example within these constraints we can power the EL44XX's from a 5V and a 12V without a negative supply by using these connections
4421 - 36
Figure 2 Using the EL44XX Mux Amps with a 5V and a 12V Supplies
10
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Applications Information
Contd is again g3V and the output swing is g6V The EL4443 or EL4444 can be wired for inverting gain with even more amplitude possible The output and positive inputs respond to overloading amplitudes correctly that is they simply clamp and remain monotonic with increasing a input overdrive A condition exists however where the b input of an active stage is overdriven by large outputs This occurs mainly in unitygain connections and only happens for negative inputs The overloaded input cannot control the feedback loop correctly and the output can become non-monotonic A typical scenario has the circuit running on g5V supplies connected for unity gain and the input is the maximum g3V Negative input extremes can cause the output to jump from b 3V to around b 2 3V This will never happen if the input is restricted to g2 5V which is the guaranteed maximum input compliance with g5V supplies and is not a problem with greater supply voltages Connecting the feedback network with a divider will prevent the overloaded output voltage from being large enough to overload the b input and monotonic
The logic input(s) and ground pin are shifted 2 5V above system ground to correctly bias the mux-amp Of course all the signal inputs and output will have to be shifted 2 5V above system ground to ensure proper signal path biasing A final caution the ground pin is also connected to the IC's substrate and frequency compensation components The ground pin must be returned to system ground by a short wire or nearby bypass capacitor In figure 2 the 22 KX resistors also serve to isolate the bypassed ground pin from the a 5V supply noise
Signal Amplitudes
Signal input and output voltages must be between (V b ) a 2 5V and (V a ) b 2 5V to ensure linearity Additionally the differential voltage on any input stage must be limited to g6V to prevent damage In unity-gain connections any input could have g3V applied and the output would be at g3V putting us at our 6V differential limit Higher-gain circuit applications divide the output voltage and allow for larger outputs For instance at a gain of a 2 the maximum input
11
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Applications Information
Contd The maximum dissipation a package support is PD max e (TD max-TA max) RTH Where TD max is the maximum die temperature 150 C for reliability less to retain optimum electrical performance TA max is the ambient temperature 70 for commercial and 85 C for industrial range RTH is the thermal resistance of the mounted package obtained from data sheet dissipation curves The most difficult case is the SO-8 package With a maximum die temperature of 150 C and a maximum ambient temperature of 85 the 65 temperature rise and package thermal resistance of 170 W gives a maximum dissipation of 382 mW This allows a maximum supply voltage of g9 2V for the EL4422 operated in our example If the %) EL4421 were driving a light load (RPAR it could operate on g15V supplies at a 70 maximum ambient
behavior is assured In any event keeping signals within guaranteed compliance limits will assure freedom from overload problems The input and output ranges are substantially constant with temperature
Power Supplies
The mux-amps work well on any supplies from g3V to g15V The supplies may be of different voltages as long as the requirements of the Gnd pin are observed (see the Switching Characteristics section for a discussion) The supplies should be bypassed close to the device with short leads 4 7 mF tantalum capacitors are very good and no smaller bypasses need be placed in parallel Capacitors as small as 0 01 mF can be used if small load currents flow Single-polarity supplies such as a 12V with a 5V can be used as described in the Switching Characteristics section The inputs and outputs will have to have their levels shifted above ground to accommodate the lack of negative supply The dissipation of the mux-amps increases with power supply voltage and this must be compatible with the package chosen This is a close estimate for the dissipation of a circuit PD e 2VS c Is max a (VS - VO) c VO RPAR Where Is max is the maximum supply current VS is the g supply voltage (assumed equal) VO if the output voltage RPAR is the parallel of all resistors loading the output
x
The EL4441 through EL4444 can operate on g12V supplies in the SO package and all parts can be powered by g15V supplies in DIP packages
Output Loading
The output stage of the mux-amp is very powerful and can source 80 mA and sink 120 mA Of course this is too much current to sustain and the part will eventually be destroyed by excessive dissipation or by metal traces on the die opening The metal traces are completely reliable while delivering the 30 mA continuous output given in the Absolute Maximum Ratings table in this data sheet or higher purely transient currents Gain or gain accuracy degrades only 10% from no load to 100X load Heavy resistive loading will degrade frequency response and video distortion only a bit becoming noticeably worse for loads k 100X
For instance the EL4422 draws a maximum of 14 mA and we might require a 2V peak output into 150X and a 270X a 270X feedback divider The RPAR is 117X The dissipation with g5V supplies is 191 mW The maximum Supply voltage that the device can run on for a given PD and the other parameter is VS max e (PD a VO2 RPAR) 2Is a VO RPAR)
12
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Applications Information
Contd The other major concern about the divider concerns unselected-channel crosstalk The differential input impedance of each input stage is around 200 KX The unselected input's signal sources thus drive current through that input impedance into the feedback divider inducing an unwanted output The gain from unselected input to output the crosstalk attenuation if RF RIN In unity-gain connection the feedback resistor is 0X and very little crosstalk is induced For a gain of a 2 the crosstalk is about b 60 dB
Capacitive loads will cause peaking in the frequency response If capacitive loads must be driven a small-valued series resistor can be used to isolate it 12X to 51X should suffice A 22X series resistor will limit peaking to 2 5 dB with even a 220 pF load
Input Connections
The input transistors can be driven from resistive and capacitive sources but are capable of oscillation when presented with an inductive input It takes about 80 nH of series inductance to make the inputs actually oscillate equivalent to four inches of unshielded wiring or about 6 of unterminated input transmission line The oscillation has a characteristic frequency of 500 MHz Often simply placing one's finger (via a metal probe) or an oscilloscope probe on the input will kill the oscillation Normal high-frequency construction obviates any such problems where the input source is reasonably close to the mux-amp input If this is not possible one can insert series resistors of around 51X to de-Q the inputs
Feedthrough Attenuation
The channels have different crosstalk levels with different inputs Here is the typical attenuation for all combinations of inputs for the mux-amps at 3 58 MHz
Feedthrough of EL4441 and EL4443 at 3 58 MHz
In1 00 Select Inputs A1A0 01 10 11 Selected
b 80 dB b 101 dB b 96 dB
In2
b 77 dB
In3
b 90 dB b 77 dB
In4
b 92 dB b 90 dB b 66 dB
Selected
b 76 dB b 84 dB
Selected
b 66 dB
Feedback Connections
A feedback divider is used to increase circuit gain and some precautions should be observed The first is that parasitic capacitance at the b input will add phase lag to the feedback path and increase frequency response peaking or even cause oscillation One solution is to choose feedback resistors whose parallel value is low The pole frequency of the feedback network should be maintained above at least 200 MHz For a 3 pF parasitic this requires that the feedback divider have less than 265X impedance equivalent to two 510X resistors when a gain of a 2 is desired Alternatively a small capacitor across RF can be used to create more of a frequency-compensated divider The value of the capacitor should match the parasitic capacitance at the b input It is also practical to place small capacitors across both the feedback resistors (whose values maintain the desired gain) to swamp out parasitics For instance two 10 pF capacitors across equal divider resistors will dominate parasitic effects and allow a higher divider resistance
Selected
Feedthrough of EL4421 at 3 58 MHz
TD is 0 5in In1 Channel Select Input A0 0 1 Selected
b 93 dB
In2
b 88 dB
Selected
Switching Glitches
The output of the mux-amps produces a small ``glitch'' voltage in response to a logic input change A peak amplitude of only about 90 mV occurs and the transient settles out in 20 ns The glitch does not change amplitude with different gain settings With the four-input multiplexers when two logic inputs are simultaneously changed the glitch amplitude doubles The increase can be a avoided by keeping transitions at least 6 ns apart This can be accomplished by inserting one gate delay in one of the two logic inputs when they are truly synchronous
13
TD is 0 5in
BLANK
14
BLANK
15
EL4421C 22C 41C 42C 43C 44C
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video 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 1996 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
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
Printed in U S A
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