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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Features
* * * * * 3 ns A-B switching 300 MHz bandwidth Fixed gain of 2, for cable driving > 650V/s slew rate TTL/CMOS compatible switch
General Description
The EL4332C is a triple very high speed 2:1 Multiplexer-Amplifier. It is intended primarily for component video multiplexing and is especially suited for pixel switching. The amplifiers have their gain set to 2 internally, which reduces the need for many external components. The gain-of-2 facilitates driving back terminated cables. All three amplifiers are switched simultaneously from their A to B inputs by the TTL/CMOS compatible, common A/B control pin. A -3 dB bandwidth of 300 MHz together with 3 ns multiplexing time enable the full performance of the fastest component video systems to be realized. The EL4332C runs from standard 5V supplies, and is available in the narrow 16-pin small outline package.
Applications
* * * * * * RGB multiplexing Picture-in-picture Cable driving HDTV processing Switched gain amplifiers ADC input multiplexer
Ordering Information
Part No. EL4332CS Temp. Range -40C to 85C Package SO16 Outline # MDP0027
Connection Diagrams
Demo Board
A demo PCB is available for this product. Request "EL4332/1 Demo Board."
November 12, 1999
(c) 1995 Elantec, Inc.
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Absolute Maximum Ratings (T
VCC to VEE VCC to any GND VEE to any GND Continuous Output Current Any Input
A
= 25 C)
14V 12V 12V 45 mA VEE - 0.3V to VCC + 0.3V
Input Current, Any Input Power Dissipation Operating Temperature Junction Temperature Storage Temperature
5 mA See Curves -40C to 85C 170C -60C to +150C
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, therefor TJ = TC = 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 = 25C and QA sample tested at TA = 25C, 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 = 25C for information purposes only.
DC Electrical Characteristics
VCC = +5V, VEE = -5V, Temperature = 25C, RL = x Parameter VOS dVOS RIN IB dIB AV dAV CIN PSRR VO IOUT XtalkAB XtalkCH-CH VIH VIL IIL IIH IS Description Input Referred Offset Voltage Input Referred Offset Voltage Delta [1] Input Resistance Input Bias Current Input Bias Current Delta [1] Gain Gain Delta [1] Input Capacitance Power Supply Rejection Ratio Output Voltage Swing into 500 load Output Voltage Swing into 150 load Current Output, Measured with 75W Load Crosstalk from Non-selected Input (at DC) Crosstalk from one Amplifier to another Amplifier Input Logic High Level Input Logic Low Level Logic Low Input Current (VIN = 0V) Logic High Input Current (VIN = 0V) Total Supply Current -0.3 -3 38 -40 0 48
[2]
Min
Typ 8 2 30 -7 0.5
Max 20 8 -30 4.0 2.06 2.5
Test Level II II V II II II II V II II V II III V II
Units mV mV k A A V/V % pF dB V V mA dB dB V V A A mA
1.94
2.00 0.5 3.3
50 2.7
70 3.6 +3/-2.7
30 -70 -70 2.0
40 -100 -100 0.8 -80 3 60
II II II II
1. Each channel's A-input to its B-input. 2. There is no short circuit protection on any output.
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
AC Electrical Characteristics
VCC = +5V, VEE = -5V, Temperature = 25C, RL = 150, CL = 3 pF. Parameter BW BW 0.1dB DG DP Pkg SR ts TSW OS ISOab ISOch-ch 10M 100M 10M 100M -3 dB Bandwidth 0.1 dB Bandwidth Differential Gain at 3.58 MHz Differential Phase at 3.58 MHz Peaking with Nominal Load Slew Rate (4V Square Wave, Measured 25%-75%) Settling Time to 0.1% of Final Value Time to Switch Inputs Overshoot, VOUT = 4 VP-P Input to Input Isolation at 10 MHz Input to Input Isolation at 100 MHz Channel to Channel Isolation at 10 MHz Channel to Channel Isolation at 100 MHz Description Min Typ 300 105 0.04 0.08 0.2 650 13 3 8 60 40 61 50 Max Test Level V V V V V V V V V V V V V Units MHz MHz % dB V/s ns ns % dB dB dB dB
Pin Descriptions
Pin Name A1, A2, A3 B1, B2, B3 GND1, GND2, GND3 Out1, Out2, Out3 VCC VEE A/B "A" inputs to amplifiers 1, 2 and 3 respectively "B" inputs to amplifiers 1, 2 and 3 respectively These are the individual ground pins for each channel. Amplifier outputs. Note: there is no short circuit protection on any output. Positive power supply. Typically +5V. Negative power supply. Typically -5V. Common input select pin, a logic high selects the "A" inputs, logic low selects the "B" inputs. CMOS/TTL compatible. Function
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Burn In Schematic
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Typical Performance Curves
Small Signal Transient Response Large Signal Transient Response
Switching to Ground from a Large Signal Uncorrelated Sine Wave
Switching from Ground to a Large Signal Uncorrelated Sine Wave
Switching to Ground from a Small Signal Uncorrelated Sine Wave
Switching from Ground to a Small Signal Uncorrelated Sine Wave
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Switching Glitch (Inputs at Ground)
Switching from a Family of DC Levels to Ground
Switching from Ground to a Family of DC Levels
Channel A/B Switching Delay
Gain vs Frequency
Gain vs Frequency
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
-3 dB BW vs Supply Voltage
Bandwidth vs Die Temperature
Frequency Response with Capacitive Loads
Input Voltage Noise over Frequency
A-Input to B-Input Isolation
Channel-Channel Isolation
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Output Swing vs Supply Voltage
Slew Rate vs Supply Voltage
Supply Current vs Supply Voltage
Slew Rate vs Die Temperature
A-Input to B-Input Isolation
Maximum Power Dissipation
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Applications
Figure 1 shows a typical use for the EL4332C. The circ ui t i s a c o m p o n e n t v i d e o ( R , G , B o r Y , U , V ) multiplexer. Since the gain of the internal amplifiers has been set to 2, the only extra components needed are the supply decoupling capacitors and the back terminating resistors, if transmission lines are to be driven. The EL4332 can drive backmatched 50 or 75 loads.
Figure 1. Typical Connection for a 2:1 Component Video Multiplexer
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Grounds
It will be noticed that each mux-amp channel has its own separate ground pin. These ground pins have been kept separate to keep the channel separation inside the chip as large as possible. The feedback resistors use these ground pins as their reference. The resistors total 400, so there is a significant signal current flowing from these pins to ground. The ground pins should all be connected together, to a ground plane underneath the chip. 1 oz. copper for the ground plane is highly recommended. Further notes and recommended practices for high speed printed circuit board layout can be found in the tutorials in the Elantec databooks. current, typically < 30 A, for a logic "low". If left to float, it will be a logic "high".
Supplies
Supply bypassing should be as physically near the power pins as possible. Chip capacitors should be used to minimize lead inductance. Note that larger values of capacitor tend to have larger internal inductances. So when designing for 3 transmission lines or similar moderate loads, a 0.1 F ceramic capacitor right next to the power pin in parallel with a 22 F tantalum capacitor placed as close to the 0.1 F is recommended. For lighter loadings, or if not all the channels are being used, a single 4.7 F capacitor has been found quite adequate. Note that component video signals do tend to have a high level of signal correlation. This is especially true if the video signal has been derived from 3 synchronously clocked DACs. This corresponds to all three channels drawing large slew currents simultaneously from the supplies. Thus, proper bypassing is critical.
Figure 2. Simplified Logic Input Stage
The input PNP transistors have sufficient gain that a simple level shift circuit (see Figure 3) can be used to provide a simple interface with Emitter Coupled Logic. Typically, 200 mV is enough to switch from a solid logic "low" to a "high."
Logic Inputs
The A/B select, logic input, is internally referenced to ground. It is set at 2 diode drops above ground, to give a threshold of about 1.4V (see Figure 2). The PNP input transistor requires that the driving gate be able to sink
Figure 3. Adapting the Select Pin for ECL Logic Levels
The capacitor Cff is only in the network to prevent the A/B pin's capacitance from slowing the control signal. The network shown level shifts the ECL levels, -0.7V to -1.5V to +1.6V and +1.1V respectively. The terminating resistor, Rtt, is required since the open emitter of the ECL gate can not sink current. If a -2V rail is not being
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
used, a 220 to 330 resistor to the -5.2V rail would have the same effect. When interstage attenuators are used, the values should be kept down in the region of 50-300. This is to prevent a combination of circuit board stray capacitance and the EL4332C's input capacitance forming a significant pole. For example, if instead of 100 as shown, resistors of 1 k had been used, and assuming 3 pF of stray and 3 pF of input capacitance, a pole would be formed at about 53 MHz.
Expanding the Multiplexer
In Figure 4, a 3:1 multiplexer circuit is shown. The expansion to more inputs is very straight forward. Since the EL4332C has a fixed gain of 2, interstage attenuators may be required as shown in Figure 3. The truth table for the 3:1 multiplexer select lines is:
X 0 0 1 Y 0 1 X Mux Output R3, G3, B3 R2, G2, B2 R1, G1, B1
Figure 4. Typical Connection for a 3:1 Component Video Multiplexer
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
A Bandwidth Selectable Circuit
In Figure 5, a circuit is shown that allows three signals to be either low pass filtered or full bandwidth. This could be useful where an input signal is frequently noisy. The component values shown give a Butterworth LPF response, with a -3 dB frequency of 50 MHz. Note again, the resistor values are low, so that stray capacitance does not affect the desired cut-off frequency.
Figure 5. Switched 50 MHz Low Pass Filter for High/Low Resolution Monitors
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
EL4332 Macromodel
* EL4332 Macromodel * Revision A, April 1996 **************************************************************************** *Applications Hints. The EL4332 has two VCC pins, one VEE pin, and three ground *pins. The VCC pins (pins 14 and 15 are internally shorted together in the model, *but the ground pins (GND1, GND2, and GND3 (nodes 2, 7, and 10, respectively) *must be connected to ground (node 0) using a le-6W resistor. Alternatively, * nodes 2, 7, and 10 may be connected to ground through a 25 resistor in parallel * with a 4 nH inductor to simulate package and PCB parasitics. **************************************************************************** * Connections: * OUT1 *| GND1 *| | A1 *| | | B1 *| | | | B2 *| | | | | A2 *| | | | | | GND2 *| | | | | | | OUT2 *| | | | | | | | *| | | | | | | | *1 2 3 4 5 6 7 8 * * OUT3 *| GND3 *| | B3 *| | | A3 *| | | | VEE *| | | | | VCC *| | | | | | VCC *| | | | | | | A/B *| | | | | | | | *| | | | | | | | *9 10 11 12 13 14 15 16 ************A B Switch *************** Rshort 14 15 le-12 rshort1 15 0 100 Meg Isw 14 110 1.5 mA vref 111 0 1.6V q1 101 16 110 qp q2 102 111 110 qp R1 101 13 500 R2 102 13 500 Rd1 107 0 100 Esw 107 0 table {v(102, 101)*100} (0,0) (1,1) * ************Amplifier #1 ************* q131 103 3 112 qp q141 104 114 113 qp q151 105 4 115 qp q161 106 117 116 qp Ia11 14 112 1 mA Ia21 14 113 1 mA Ib11 14 115 1 mA Ib21 14 116 1 mA Rga1 112 113 275 Rgb1 115 116 275 R31 103 13 275 R41 104 13 275 R51 105 13 275 R61 106 13 275 R71 1 114 400 13
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
R81 114 2 400 R911 117 400 R110 117 2 400 Ediff1 108 0 value {(v(104,103)*v(107))+(v(106,105)*(1-v(107)))} rdiff1 108 0 1K * *Compensation Section * ga1 0 134 108 0 1m rh1 134 0 5 Meg cc1 134 0 0.6 pF * *Poles * ep1 141 0 134 0 1.0 rpa1 141 142 200 cpa1 142 0 0.75 pF rpb1 142 143 200 cpb1 143 0 0.75 pF * *Output Stage * i011 15 150 1.0 mA i021 151 13 1.0 mA q71 13 143 150 qp q81 15 143 151 qn q91 15 150 152 qn q101 13 151 153 qp ros11 152 1 2 ros21 153 1 2 * ************Amplifier #2*********** q231 203 6 212 qp q241 204 214 213 qp q251 205 5 215 qp q261 206 217 216 qp Ia12 14 212 1 mA Ia22 14 213 1 mA Ib12 14 215 1 mA Ib22 14 216 1 mA Rga2 212 213 275 Rgb2 215 216 275 R231 203 13 275 R241 204 13 275 R251 205 13 275 R261 206 13 275 R271 8 214 400 R281 214 7 400 R291 8 217 400 R210 217 7 400 Ediff2 208 0 value {(v(204,203)*v(107))+(v(206,205)*(1-v(107)))} rdiff2 208 0 1K * * Compensation Section * ga2 0 234 208 0 1m rh2 234 0 5 Meg cc2 234 0 0.6 pF * * Poles * ep2 241 0 234 0 1.0 rpa2 241 242 200 cpa2 242 0 0.75 pF 14
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
rpb2 242 243 200 cpb2 243 0 0.75 pF * *Output Stage * i0 12 15 250 1.0 mA i022 251 13 1.0 mA q271 13 243 250 qp q281 15 243 251 qn q291 15 250 252 qn q201 13 251 253 qp ros12 252 8 2 ros22 253 8 2 * ************Amplifier #3 ************ q331 303 12 312 qp q341 304 314 313 qp q351 305 11 315 qp q361 306 317 316 qp Ia13 14 312 1 mA Ia23 14 313 1 mA Ib13 14 315 1 mA Ib23 14 316 1 mA Rga3 312 313 275 Rgb3 315 316 275 R331 303 13 275 R341 304 13 275 R351 305 13 275 R361 306 13 275 R371 9 314 400 R381 314 10 400 R391 9 317 400 R310 317 10 400 Ediff3 308 0 value {( v(304,303)*(v(107))+(v(306,305)*(1-v(107)))} rdiff3 308 0 1K * * Compensation * ga3 0 334 308 01m rh3 334 0 5 Meg cc3 334 0 0.6 pF * * Poles * ep3 341 0 3340 1.0 rpa3 341 342 200 cpa3 342 0 0.75 pF rpb3 342 343 200 cpb3 343 0 0.75 pF * * Output Stage * i013 15 350 1.0 mA i023 351 13 1.0 mA q371 13 343 350 qp q381 15 343 351 qn q391 15 350 352 qn q301 13 351 353 qp ros13 352 9 2 ros23 353 9 2 * * Power Supply Current * ips 15 13 22 mA 15
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
* *Models * .model qp pnp(is=1.5e-16 bf=300 tf=0.01 ns) .model qn npn(is=0.8e-18 bf=300 tf=0.01 ns) .ends
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EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
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
November 12, 1999
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
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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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