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| (R) EL4331 Data Sheet May 12, 2004 FN7162.1 Triple 2:1 Mux-Amp AV = 1 The EL4331 is a triple, very high speed, 2:1 Multiplexing Amplifier. It is intended primarily for component video multiplexing, and is especially suited for pixel switching. The amplifiers have their gain set to 1, internally. All three amplifiers are switched simultaneously from their A to B inputs by the TTL/CMOS compatible, common A/B control pin. The EL4331 has a power-down mode, in which the total supply current drops to less than 1mA. In this mode, each output will appear as a high impedance. The EL4331 runs from standard 5V supplies, and is available in the narrow 16-pin small outline package. The package is specified for operation over the full -40C to +85C temperature range. Features * 3ns A-B switching * 300MHz bandwidth * Power-down mode * TTL/CMOS compatible controls * Fixed gain of 1 * 400V/s slew rate * Pb-free available Applications * RGB multiplexing * Picture-in-picture * Cable driving * HDTV processing * Switched gain amplifiers * ADC input multiplexer Pinout EL4331 (16-PIN SO) TOP VIEW Ordering Information PART NUMBER EL4331CS EL4331CS-T7 EL4331CS-T13 EL4331CSZ (Note) EL4331CSZ-T7 (Note) PACKAGE 16-Pin SO (0.150") 16-Pin SO (0.150") 16-Pin SO (0.150") 16-Pin SO (0.150") (Pb-Free) 16-Pin SO (0.150") (Pb-Free) TAPE & REEL 7" 13" 7" 13" PKG. DWG. # MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 EL4331CSZ-T13 16-Pin SO (0.150") (Note) (Pb-Free) NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J Std-020B. 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners. EL4331 Absolute Maximum Ratings (TA = 25C) VCC to VEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14V VCC to Any GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12V VEE to Any GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12V Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 45mA Any Input (except PD) . . . . . . . . . . . . . . . . . VEE-0.3V to VCC+0.3V PD Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .VCC-7V to VCC+0.3V Input Current, Any Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See curves Ambient Operating Temperature . . . . . . . . . . . . . . . .-40C to +85C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA DC Electrical Specifications PARAMETER VOS dVOS IB dIB AVOL PSRR VOUT_500 VOUT_150 IOUT XTALK VIH VIL IIL_AB IIH_AB IIL_PD IIH_PD IS IS(PD) NOTES: 1. Any channel's A-input to its B-input. VCC = +5V, VEE = -5V, Ambient Temperature = 25C, RL = 500, PD = 5V DESCRIPTION MIN TYP -12 1 -7 0.5 54 60 2.7 70 3.2 +3/-2.7 30 -70 2.0 0.8 -1 -5 -10 0.5 38 -20 0 0 1.0 48 0.01 -100 5 10 1.6 60 1.0 40 -85 MAX 30 8 -30 4.0 UNIT mV mV A A dB dB V V mA dB V V A A A mA mA mA Input Referred Offset Voltage Input A to Input B Offset Voltage (Note 1) Input Bias Current Input A to Input B Bias Current (Note 1) Open Loop Gain (from Gain Error Calculation) Power Supply Rejection Ratio Output Voltage Swing into 500 Load Output Voltage Swing into 150 Load Current Output, Measured with 75 load (Note 2) Crosstalk from Non-Selected Input (at DC) Input Logic High Level (A/B and PD) Input Logic Low Level (A/B and PD) Logic Low Input Current (VIN = 0.8V), A/B Pin Logic High Input Current (VIN = 2.0V), A/B Pin Logic Low Input Current (VIN = 0.8V), PD Pin Logic High Input Current (VIN = 5.0V), PD Pin Total Supply Current Powered Down Supply Current 2. There is no short circuit protection on any output. AC Electrical Specifications PARAMETER BW -3dB Bandwidth VCC = +5V, VEE = -0.5V, Ambient Temperature = 25C, RL = 150 and CL = 5pF DESCRIPTION MIN TYP 300 400 400 13 3 8 MAX UNIT MHz MHz V/s ns ns % -3dB BW with 250 and 10pF Load SR TS TAB OS Slew Rate (4V Square Wave, Measured 25%-75%) Settling Time to 0.1% of Final Value Time to Switch Inputs Overshoot, VOUT = 4Vpk-pk 2 EL4331 AC Electrical Specifications PARAMETER ISO-AB-10M ISO-AB-100M ISO-CH-10M ISO-CH-CH-100M Pkg TON_PD TOFF_PD VCC = +5V, VEE = -0.5V, Ambient Temperature = 25C, RL = 150 and CL = 5pF (Continued) DESCRIPTION Input to Input Isolation at 10MHz Input to Input Isolation at 100MHz Channel to Channel Isolation at 10MHz Channel to Channel Isolation at 100MHz Peaking with Nominal Load Power-Down Turn-On Time Power-Down Turn-Off Time MIN TYP 53 33 56 33 0 150 1 MAX UNIT dB dB dB dB dB ns s Typical Performance Curves 3dB Bandwidth Small Signal Transmit Response Large Signal Transient Response Switching from Ground to An Uncorrelated Sine Wave and Back Switching a Family of DC Levels to Ground and Back Switching Glitch, 0V to 0V with 2ns AB edges Switching Glitch, 0V to 0V with 10ns AB Edges 3 EL4331 Typical Performance Curves (Continued) Switching a Family of DC Levels to a Sine Wave and Back Output Response In and Out of Power-Down with a Family of DC Inputs Output Power-Down Turn-Off Response Output Power-Down Turn-On Response Frequency Response with 150 and 5pF Load Frequency Response with 240 and 5pF Load 4 EL4331 Typical Performance Curves (Continued) Frequency Response with 150 and Various Values of Capacitive Load Frequency Response with 240 and Various Values of Capacitive Load A-Input to B-Input Isolation Channel to Channel Isolation Supply Current vs Power-Down Voltage -3dB BW vs Supply Voltage 5 EL4331 Typical Performance Curves (Continued) Slew Rate vs Temperature Slew Rate vs Supply Voltage Total Harmonic Distortion Voltage Noise Spectral Density Output Voltage Swing vs Supply Voltage 1.8 POWER DISSIPATION (W) 1.6 JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD POWER DISSIPATION (W) 1.2 JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD SO16 (0.150") JA=110C/W 1.4 1.563W 1.2 1 0.8 0.6 0.4 0.2 0 0 25 50 SO16 (0.150") JA=80C/W 1 1.136W 0.8 0.6 0.4 0.2 0 0 25 50 75 85 100 125 150 75 85 100 125 150 AMBIENT TEMPERATURE (C) AMBIENT TEMPERATURE (C) 6 EL4331 Pin Descriptions PIN NAME A1, A2, A3 B1, B2, B3 GND1, GND2, GND3 OUT1, OUT2, OUT3 VCC VEE A/B PD "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. 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. If left to float, this pin will float high and the "A" channels will be selected. A logic low puts the part into its power-down mode. Note that when this pin is at a logic high (+5V), it will sink typically 1mA. When pulled low, it will source a few A, typically < 25A. This pin should not be left floating. PIN DESCRIPTION Applications Information Circuit Operation Each multiplexing amplifier has two input stages. The multiplexing amplifiers switch from their "A" inputs to their "B" inputs under control of the common A/B select pin. The switching has a make before break action. Each amplifier is internally connected for unity gain, allowing larger switching matrixes to be built up. Note however, that each amplifier likes to see a load of 250 or less; load resistances higher than this, can lead to excessive peaking. Load capacitance should be kept down below 40pF, and 40pF requires a load resistance of 150 to keep the output from excessive peaking. Higher capacitive loads can best be driven using a series resistor to isolate the amplifier from the reactive load. The ground pins are used as a reference for the logic controls. Both A/B and PD are referenced to ground. The supplies do not have to be symmetrical around ground, but the logic inputs are referred to the ground pins, and the logic swing must not exceed the +V supply. Due to the fact that all three channels share common control pins, the three grounds have to be at the same potential. One third of the 1mA that PD will sink (at 5V) will be seen at each ground pin. Also, the individual grounds are internally connected to their channel compensation capacitor in an effort to keep crosstalk low. Power-Down Referring to the photographs of the power-down function and Figure 4, it will be noted that there is a considerable glitch in the output as the part powers down. It will also be noted that the power-down time is considerably longer than power up, 1s compared to 150ns. In power-down mode, the whole amplifier, its reference and bias lines are all powered down. At the same time, the output stage has been configured so that the powered down output appears as a high impedance. This allows circuits such as the multiplexer shown in application #4 to be realized, although the price is the significant output disturbance as one part turns on before the other has fully turned off. Single Supply Operation Due to the fact that video signals often have negative sync levels and invariably require ground to be within the signal swing, running the EL4331 on a single supply rail compromises many aspects of its performance. It is difficult to generate a solid, clean, pseudo ground a few volts away from ground without using more power, and components than simply providing a negative power rail. A signal ground has to be capable of handling all the return currents from all the inputs, as well as the outputs, from DC to frequencies in excess of 400MHz. While this is by no means impossible, a negative rail can be generated from a standard +5V rail for a couple of dollars and a square inch, or less, of board space. However, a pseudo ground can be derived with for example an LM336, to give an "AC ground" 2.5V above 0V. The logic inputs will need some form of level shifting to ensure that the logic "1" and "0" specifications can be met. The pseudo ground must be well bypassed to the real ground; note that the pseudo ground will have to sink/source all the current that flows in the internal compensation capacitors during slewing. This can easily be several milliamps in a few nanoseconds. If the pseudo ground "moves" because one channel is forcing current into the derived ground, cross-talk into the other two channels will become very significant. A/B Switching Referring to the photographs showing the 0V-0V switching glitches, it will be noted that slower edges on the A/B control pin result in switching glitches of somewhat less total energy. The switching action is a make-before-break, so the two inputs essentially get mixed at the output for a few nanoseconds. Note that the two inputs are buffered, so there is no component of one input injected into the other input. The input impedance does not depend on whether an input has been selected. 7 EL4331 Application Circuit #1 Figure 1 shows a very high speed RGB (or YUV) multiplexer. Two video sources can be displayed on one monitor with the only stipulation that the video sources have to be synchronous. An example is a picture-in-picture, or "window" is generated with one video source (e.g. RGB TV) in a window, and a computer application around it. Multiplexing synchronous RGB signals has the advantage that the video signals do not have to be digitized, and an image stored in RAM prior to being displayed. FIGURE 2. A BANDWIDTH-SELECTABLE FILTER Application Circuit #3 Figure 3 shows one of the three channels of a component video, 8:1 multiplexer. The A/B select pins naturally allow binary coded addressing--allowing simple microprocessor or state machine control. Note that each amplifier output is loaded, to keep the amplifier outputs damped. Photograph A1 shows a staircase generated by having all the inputs (sig0 through sig7) connected to a resistive divider chain, and the select bits were driven by a binary counter. Photograph A2 shows the glitch between steps 4 and 5; this is the worst glitch since all three banks of EL4331s are switching together. The magnitude of this glitch is affected by the timing skew of the select lines, the physical length of the traces, and the difference in amplitude of the two signals. This particular circuit was bread-boarded using EL4331s on their adapter boards (available from Elantec for those who can not breadboard with SOICs), and the binary counter was an 'LS163. FIGURE 1. TWO RGB SOURCES MULTIPLEXED TO ONE RGB OUTPUT When the monitor is switched off, or goes into its powersaving blanked mode, the EL4331 can be powered down to further save power. The input impedance does not change appreciably between powered up and down modes, although the bias current does drop to near zero. A demonstration board with this circuit on it is available from Elantec. Application Circuit #2 Figure 2 shows a circuit that has either a very wide bandwidth, or an 11MHz low pass response. The EL4331's "A" inputs are connected to the one frequency determining set of components, while the "B" inputs are connected directly. The A/B select pin therefore selects the desired bandwidth. This would allow appropriate filtering to clean up noisy low bandwidth video signals when displaying them on a high quality wide bandwidth monitor. 8 EL4331 Note: No supply bypass capacitors shown and only one of three channels shown. BIT2 0 0 0 0 1 1 1 1 TABLE 1. CHANNEL SELECTION TABLE BIT1 0 0 1 1 0 0 1 1 BIT0 0 1 0 1 0 1 0 1 OUTPUT SIG0 SIG1 SIG2 SIG3 SIG4 SIG5 SIG6 SIG7 FIGURE 3. A HIGH SPEED, 8:1 COMPONENT VIDEO MULTIPLEXER PHOTOGRAPH A1 PHOTOGRAPH A2 PHOTOGRAPH A3 PHOTOGRAPH A4 9 EL4331 Photograph A3 shows the same circuit, with the counter running at 25MHz. This turns out to be close to the limit of the TTL counter used in the breadboard, rather than the limit of the EL4331. Here the different glitches are easily recognizable - a small glitch for one of the 4 input EL4331s A/B switching, somewhat larger glitches when two banks switch together, and the biggest glitch when all three banks switch. Photograph A4 shows the big glitch in detail. A good PCB and equal length and matched traces would clean up these glitches. Note: No supply bypass capacitors shown. Only one of three channels shown. TABLE 2. CHANNEL SELECTION TABLE BIT2 0 0 0 0 1 1 1 1 BIT1 0 0 1 1 0 0 1 1 BIT0 0 1 0 1 0 1 0 1 OUTPUT SIG0 SIG1 SIG2 SIG3 SIG4 SIG5 SIG6 SIG7 Figure 4 shows one of the three channels of a component video, 8:1 multiplexer. In this example, the power-down capability is used to save on EL4331s, but as can be seen, the control part does become more complicated. Using the power-down mode for multiplexing does, of course, slow down the speed with which one can select a given input channel. However, if input channel selection can be done during a blanking period, the couple of microseconds that it takes to power-down one chip may be no problem. Note that some external logic is needed in this application, both to select the appropriate amplifier, and also to force a breakbefore-make action by pulling the T_OFF line low. All this logic would best be incorporated inside a PAL or gate array, and is shown in gate form just to illustrate the idea. Note that the BIT0 line would have the 3ns response time, since it is switching the muxamps directly. 8-to-1 Multiplexer using Power-Down FIGURE 4. A SIMPLE 8:1 COMPONENT VIDEO MULTIPLEXER All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 10 |
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