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_______________general description the max463?ax470 series of two-channel, triple/quad buffered video switches and video buffers combines high-accuracy, unity-gain-stable amplifiers with high-performance video switches. fast switching time and low differential gain and phase error make this series of switches and buffers ideal for all video appli- cations. the devices are all specified for ?v supply operation with inputs and outputs as high as ?.5v when driving 150 loads (75 back-terminated cable). input capacitance is typically only 5pf, and channel-to- channel crosstalk is better than 60db, accomplished by surrounding all inputs with ac ground pins. the on- board amplifiers feature a 200v/? slew rate (300v/? for a v = 2v/v amplifiers), and a bandwidth of 100mhz (90mhz for a v = 2v/v buffers). channel selection is controlled by a single ttl-compatible input pin or by a microprocessor interface, and channel switch time is only 20ns. for design flexibility, devices are offered with buffer- amplifier gains of 1v/v or 2v/v for 75 back-terminated applications. output amplifiers have a guaranteed out- put swing of ?v into 75 . devices offered in this series are as follows: ________________________applications broadcast-quality color-signal multiplexing rgb multiplexing rgb color video overlay editors rgb color video security systems rgb medical imaging coaxial-cable line drivers ____________________________features ? 100mhz unity-gain bandwidth ? 90mhz bandwidth with 2v/v gain ? 0.01%/0.03 differential gain/phase error ? drives 50 and 75 back-terminated cable directly ? wide output swing: ?v into 75 ?.5v into 150 ? 300v/? slew rate (2v/v gain) ? 20ns channel switching time ? logic disable mode: high-z outputs reduced power consumption ? outputs may be paralleled for larger networks ? 5pf input capacitance (channel on or off) ______________ordering information ordering information continued on last page. * dice are specified at t a = +25?, dc parameters only. max463?ax470 two-channel, triple/quad rgb video switches and buffers ________________________________________________________________ maxim integrated products 1 top view pin configurations continued at end of data sheet. in0a gnd in1a gnd in2a v- v- in0b gnd in1b gnd in2b dip/so 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 gnd le en a0 cs v- out0 v+ out1 gnd v+ out2 max463 max465 3p2t switch _________________pin configurations call toll free 1-800-998-8800 for free samples or literature. part temp. range pin-package max463 cng 0? to +70? 24 narrow plastic dip max463cwg 0? to +70? 24 wide so max463c/d 0? to +70? dice* part description voltage gain (v/v) max463 triple rgb switch & buffer 1 max464 quad rgb switch & buffer 1 max465 triple rgb switch & buffer 2 MAX466 quad rgb switch & buffer 2 max467 triple video buffer 1 max468 quad video buffer 1 max469 triple video buffer 2 max470 quad video buffer 2 max463eng 24 narrow plastic dip max463ewg -40? to +85? 24 wide so -40? to +85? 19-0219; rev 2; 6/94 typical operating circuit appears at end of data sheet. evaluation kit manual follows data sheet
max463?ax470 two-channel, triple/quad rgb video switches and buffers 2 _______________________________________________________________________________________ power-supply ranges v+ to v- ................................................................................12v analog input voltage ..........................(v- - 0.3v) to (v+ + 0.3v) digital input voltage ...................................-0.3v to (v+ + 0.3v) output short-circuit duration (to gnd)........................1 minute input current into any pin, power on or off...................?0ma continuous power dissipation (t a = +70?) 16-pin plastic dip (derate 22.22mw/? above +70?) ....1778mw 16-pin wide so (derate 20.00mw/? above +70?) .......1600mw 24-pin narrow plastic dip (derate 20.2mw/? above +70?)..................................1620mw 24-pin wide so (derate 19.3mw/? above +70?) .........1590mw 28-pin narrow plastic dip (derate 20.2mw/? above +70?)..................................1620mw 28-pin wide so (derate 18.1mw/? above +70?) .........1440mw operating temperature ranges max4_ _c_ _.........................................................0? to +70? max4_ _e_ _ ......................................................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10sec) .............................+300? electrical characteristics (v+ = 5v, v- = -5v, -2v v in +2v, r load = 75 , unless otherwise noted.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. parameter symbol units voltage-gain accuracy 0.2 0.5 % input capacitance c in 5 pf on input resistance r in 300 700 k on input bias current i bias ? ? ? 0.3 1.0 output voltage swing v out ?.5 ?.8 v ?.0 ?.4 output impedance r out 5 input voltage range operating supply voltage v s ?.75 ? ?.25 v v in -2 2 v power-supply rejection ratio psrr 50 60 db 0.05 0.1 r outd 150 250 k 0.7 1 k c outd 10 pf positive supply current i+ 65 80 ma 85 100 35 45 40 50 conditions channel off or on r load = 150 max463/max464 max465/MAX466 r load = 75 f in = dc max463?ax466 max463/max465, disabled mode max464/MAX466, disabled mode absolute maximum ratings t a = t min to t max min max 1.0 150 ? 2.0 ?.5 100 -1.5/+2 0.7 100 120 ?.75 ?.25 50 -2 2 55 50 output resistance, disabled mode output capacitance, disabled mode offset voltage v os ? ?0 mv ?5 max463/max464, max467/max468 (note 1) max465/MAX466, max469/max470, r load = 150 , (note 2) f in = 10mhz max463/max465/max467/max469, v in = 0v max464/MAX466/max468/max470, v in = 0v t a = +25? min typ max max463/max464, max467/max468 max465/MAX466, max469/max470
max463?ax470 two-channel, triple/quad rgb video switches and buffers _______________________________________________________________________________________ 3 electrical characteristics (continued) (v+ = 5v, v- = -5v, -2v v in +2v, r load = 75 , unless otherwise noted.) parameter differential phase error (note 3) symbol 0.03 units deg. 300 dp v/? slew rate 0.14 sr 200 input noise density en 20 nv/ h z 25 35 settling time to 0.1% -3db bandwidth bw 100 mhz 90 t s 50 ns xtalk 0.01 60 % differential gain error (note 3) db dg 0.12 all-hostile crosstalk (note 5) xtalk 50 db iso negative supply current 70 i- 50 65 db ma t pd 15 ns 65 80 t sw 20 ns switching transient 300 mv p-p 20 30 t off 80 ns logic input high threshold v ih 2 v logic input low threshold v il 0.8 v conditions max463/max464, max467/max468 max465/MAX466, max469/max470 max465/MAX466, max469/max470 max463/max464, max467/max468 f in = 10khz max464/MAX466, disabled mode max463/max464, max467/max468 max465/MAX466, max469/max470 v in = 2v-to-0v step f in = 10mhz max463/max464, max467/max468 max465/MAX466, max469/max470 f in = 10mhz f in = 10mhz, max463?ax466 max463?ax466 max463?ax466 v ina = v inb = 0v, max463?ax466 max463/max465, disabled mode max463?ax466 e n , a0, c s , le; max463?ax466 e n , a0, c s , le; max463?ax466 t a = t min to t max min max 40 75 95 35 2 0.8 max463/max465/max467/max469, v in = 0v max464/MAX466/max468/max470, v in = 0v adjacent channel crosstalk (note 4) all-hostile off isolation (note 6) channel switching propagation delay (note 7) logic input current high i inhi 200 ? e n , a0, c s , le; max463?ax466 200 logic input current low i inlo 200 ? e n , a0, c s , le; max463?ax466 200 channel switching time (note 8) amplifier switching off-time (note 9) amplifier switching on-time (note 10) t on 100 ns max463?ax466 t a = +25? min typ max
10k 100k max468 gain and phase responses 0 max463/470 -01 frequency (hz) gain (db) 1m 100m ? ? ? 1 2 180 108 36 144 72 0 phase (degrees) 10m gain phase 1g 100k max464 output impedance vs. frequency 1 max463/470 -02 frequency (hz) output impedance ( ) 1m 100m 0.01 0.1 10 100 10m 10k w 1k 100k max468 power-supply rejection ratio vs. frequency 40 max463/470 -03 frequency (hz) psrr (db) 1m 100m 10 20 30 50 60 10m 10k v+ v max463?ax470 two-channel, triple/quad rgb video switches and buffers 4 _______________________________________________________________________________________ electrical characteristics (continued) (v+ = 5v, v- = -5v, -2v v in +2v, r load = 75 , unless otherwise noted.) parameter symbol units address setup time (note 11) t su conditions t a = t min to t max min max 30 ns e n , a0, c s , le; max463?ax466 30 address hold time (note 11) t h 0 ns e n , a0, c s , le; max463?ax466 0 c s pulse width low (note 11) t cs 15 ns e n , a0, c s , le; max463?ax466 15 note 1: voltage gain accuracy for the unity-gain devices is defined as [(v out - v in ) at v in = 1v - (v out - v in ) at v in = -1v]/2. note 2: voltage gain accuracy for the gain-of-two devices is defined as [(v out /2 - v in ) at v in = 1v - (v out /2 - v in ) at v in = -1v]/2. note 3: tested with a 3.58mhz sine wave of amplitude 40ire superimposed on a linear ramp (0ire to 100ire), r l = 150 to ground. note 4: tested with the selected input connected to ground through a 75 resistor, and a 4v p-p sine wave at 10mhz driving adjacent input. note 5: tested in the same manner as described in note 4, but with all other inputs driven. note 6: tested with le = 0v, e n = v+, and all inputs driven with a 4v p-p , 10mhz sine wave. note 7: measured from a channel switch command to measurable activity at the output. note 8: measured from where the output begins to move to the point where it is well defined. note 9: measured from a disable command to amplifier in a non-driving state. note 10: measured from an enable command to the point where the output reaches 90% current out. note 11: guaranteed by design. t a = +25? min typ max __________________________________________typical operating characteristics (t a = +25?, unless otherwise noted.)
max463?ax470 two-channel, triple/quad rgb video switches and buffers _______________________________________________________________________________________ 5 100 voltage gain accuracy vs. temperature max463/470 -04 temperature (?) percentage (%) ?5 0 50 25 75 ?0 0.06 0.08 0.10 0.12 0.14 0.16 max465 max463 100 max463 disabled output resistance vs. temperature max463/470 -05 temperature (?) output resistance (k w ) ?5 0 50 25 75 ?0 200 250 300 350 400 100 max465 disabled output resistance vs. temperature max463/470 -06 temperature (?) output resistance (k w ) ?5 0 50 25 75 ?0 1.10 1.15 1.20 1.25 1.30 10 100 supply current per amplifier vs. temperature max463/470 -09 temperature (?) supply current per amplifier (ma) 20 15 ?5 0 50 25 25 75 ?0 0 30 5 i+ i 10 100 disabled supply current vs. temperature max463/470 -07 temperature (?) supply current (ma) 20 15 ?5 0 50 25 25 75 ?0 35 30 40 i+ i 4 ? 10 100 output voltage swing vs. load resistance 0 max463/470 -08 load resistance ( ) output voltage (v) w 1000 10000 ? ? ? 1 2 3 max463/4/7/8:v in = 4v max465/6/9/70:v in = 2v ____________________________typical operating characteristics (continued) (t a = +25?, unless otherwise noted.)
max463?ax470 two-channel, triple/quad rgb video switches and buffers 6 _______________________________________________________________________________________ max464 small-signal step response gnd gnd 10ns/div a: v in , 100mv/div b: v out , 100mv/div MAX466 small-signal step response gnd gnd 10ns/div a: v in , 100mv/div b: v out , 200mv/div max464 large-signal step response gnd gnd 20ns/div a: v in , 2v/div b: v out , 2v/div max464 output transient when switching between two grounded inputs 50ns/div a: cs, 5v/div b: a0, 5v/div c: out0, 100mv/div gnd gnd gnd MAX466 large-signal step response gnd gnd 20ns/div a: v in , 1v/div b: v out , 2v/div max464 en response time 50ns/div a: cs, 5v/div b: en, 5v/div c: out3, 1v/div gnd gnd gnd t off t on ____________________________typical operating characteristics (continued) (t a = +25?, unless otherwise noted.)
max463?ax470 two-channel, triple/quad rgb video switches and buffers _______________________________________________________________________________________ 7 chip-select?atch control for the digital inputs. when c s is low, a0 and e n input registers are transparent. when c s goes high, the a0 input register latches. if le is high, the e n input register also latches when c s goes high (see le). digital latch-enable input. when le is low, the e n register is transparent; when le is high, the e n register is transparent only when c s is low. hard- wire to v+ or gnd for best crosstalk performance. channel-select input. when c s is low, driving a0 low selects channel a and driving a0 high selects channel b. e n 27 le 23 26 buffer-enable input. when c s is low or le is low, driving e n low enables all output buffers and driving e n high disables all output buffers. 22 25 a0 21 2, 4, 9, 11, 15, 24 12 channel b, analog input 2 in2b 12 14 channel b, analog input 3 in3b 15 buffered analog output 3 out3 17 buffered analog output 2 out2 13 16, 18 positive power-supply input. connect to +5v. v+ 14, 17 20 buffered analog output 1 out1 16 22 buffered analog output 0 out0 18 24 c s 20 6 channel a, analog input 3 in3a 7, 9, 21, 23 negative power-supply input. connect to -5v. thermal path. v- 6, 7, 19 8 channel b, analog input 0 in0b 8 10 channel b, analog input 1 in1b 10 2 channel a, analog input 1 in1a 3 4 channel a, analog input 2 in2a 5 1, 3, 5, 11, 13, 19 analog ground gnd max464/MAX466 max463/max465 name 28 channel a, analog input 0 in0a 1 function pin _____________________________________________________________pin descriptions 14 buffered analog output 1 out1 14 16 buffered analog output 0 out0 16 10 positive power-supply input. connect to +5v. v+ 10 11 buffered analog output 2 out2 11 max468/max470 max467/max469 4, 5, 12, 13 negative power-supply input. connect to -5v. thermal path. v- 4, 5, 12, 13 6 analog input 2 in2 6 8 analog input 3 in3 9 buffered analog output 3 out3 2, 7, 15 analog ground gnd 2, 7, 8, 9, 15 3 1 analog input 1 in1 3 analog input 0 in0 1 function pin name
_______________detailed description the max463?ax470 have a bipolar construction, which results in a typical channel input capacitance of only 5pf, whether the channel is on or off. this low input capacitance allows the amplifiers to realize full ac performance, even with source impedances as great as 250 . it also minimizes switching transients because the driving source sees the same load whether the channel is on or off. low input capaci- tance is critical, because it forms a single-pole rc low- pass filter with the output impedance of the signal source, and this filter can limit the system? signal bandwidth if the rc product becomes too large. the max465/MAX466/max469/max470? amplifiers are internally configured for a gain of two, resulting in an over- all gain of one at the cable output when driving back-ter- minated coaxial cable (see the section driving coaxial cable ). the max463/max464/max467/max468 are internally configured for unity gain. power-supply bypassing and board layout to realize the full ac performance of high-speed ampli- fiers, pay careful attention to power-supply bypassing and board layout, and use a large, low-impedance ground plane. with multi-layer boards, the ground plane should be located on the layer that is not dedi- cated to a specific signal trace. to prevent unwanted signal coupling, minimize the trace area at the circuit's critical high-impedance nodes, and surround the analog inputs with an ac ground trace (analog ground, bypassed dc power supply, etc). the analog input pins to the max463?ax470 have been separated with ac ground pins (gnd, v+, v-, or a hard-wired logic input) to minimize parasitic coupling, which can degrade crosstalk and/or stability of the amplifier. keep signal paths as short as possible to minimize inductance, and ensure that all input channel traces are of equal length to maintain the phase relationship between the r, g, and b signals. connect the coaxial-cable shield to the ground side of the 75 terminating resistor at the ground plane to further reduce crosstalk (see figure 1). bypass all power-supply pins directly to the ground plane with 0.1? ceramic capacitors, placed as close to the supply pins as possible. for high-current loads, it may be necessary to include 10? tantalum or alu- minum-electrolytic capacitors in parallel with the 0.1? ceramics. keep capacitor lead lengths as short as possible to minimize series inductance; surface-mount (chip) capacitors are ideal. connect all v- pins to a large power plane. the v- pins conduct heat away from the internal die, aiding thermal dissipation. differential gain and phase errors differential gain and phase errors are critical specifica- tions for an amplifier/buffer in color video applications, because these errors correspond directly to changes in the color of the displayed picture in composite video systems. the max467?ax470 have low differential gain and phase errors, making them ideal in broadcast- quality composite color applications, as well as in rgb video systems where these errors are less significant. the max467?ax470 differential gain and phase errors are measured with the tektronix vm700 video measurement set, with the input test signal provided by the tektronix 1910 digital generator as shown in figure 2. measuring the differential gain and phase of the max469/max470 (figure 2a) is straightforward because the output amplifiers are configured for a gain of two, allowing connection to the vm700 through a back-termi- nated coaxial cable. since the max467/max468 are unity-gain devices, driving a back-terminated coax would result in a gain of 1/2 at the vm700. figure 2b shows a test method to measure the differen- tial gain and phase for the max467/max468. first, measure and store the video signal with the device under test (dut) removed and replaced with a short circuit, and the 150 load resistor omitted. then do another measurement with the dut and load resistor in the circuit, and calculate the differential gain and phase errors by subtracting the results. max463?ax470 two-channel, triple/quad rgb video switches and buffers 8 _______________________________________________________________________________________ r t r t ground plane return current return current coax coax figure 1. low-crosstalk layout. return current from the termination resistor does not flow through the ground plane.
max463?ax470 two-channel, triple/quad rgb video switches and buffers _______________________________________________________________________________________ 9 driving coaxial cable high-speed performance, excellent output current capability, and an internally fixed gain of two make the max465/MAX466/max469/max470 ideal for driving 50 or 75 back-terminated coaxial cables. the max465/MAX466/max469/max470 will drive a 150 load (75 back-terminated cable) to ?.5v. the typical operating circuit shows the max465/MAX466 driving four back-terminated 75 video cables. the back-termination resistor (at each amplifier output) pro- vides impedance matching at the driven end of the cable to eliminate signal reflections. it forms a voltage divider with the load impedance, which attenuates the signal at the cable output by one-half. the amplifier operates with an internal 2v/v closed-loop gain to pro- vide unity gain at the cable? output. driving capacitive loads driving large capacitive loads increases the likelihood of oscillation in most amplifier circuits. this is especially true for circuits with high loop-gains, like voltage follow- ers. the amplifier? output impedance and the capaci- tive load form an rc filter that adds a pole to the loop response. if the pole frequency is low enough, as when driving a large capacitive load, the circuit phase margin is degraded and oscillation may occur. the max463?ax470 phase margin and capacitive- load driving performance are optimized by internal compensation. when driving capacitive loads greater than 50pf, connect an isolation resistor between the amplifier output and the capacitive load, as shown in figure 3. 75 w cable 75 w cable 75 w cable 75 w cable 75 w 75 w 75 w 75 w 75 w 75 w cable 75 w 75 w 150 w source: tektronix 1910 digital generator measurement: tektronix vm700 video measurement set a v = 2 max469/max470 max467/max468 dut dut (a) (b) figure 2. differential phase and gain error test circuits (a) for the max469/max470 gain-of-two amplifiers, (b) for the max467/max468 unity-gain amplifiers max468 a v = 1 12 w 100pf out_ in_ figure 3a. using an isolation resistor with a capacitive load
max463?ax470 two-channel, triple/quad rgb video switches and buffers 10 ______________________________________________________________________________________ t cs t su t h t su t h t off high-z t on t pd t sw outputs en a0 cs le = v+ figure 4. logic timing diagram digital interface the max463?ax466 multiplexer architecture provides an input transistor buffer, ensuring that no input chan- nels are ever connected together. select a channel by changing a0's state (a0 = 0 for channel a, and a0 = 1 for channel b) and pulsing c s low (see tables 1a, 1b). figure 4 shows the logic timing diagram. output disable (max463?ax466) when the enable input (e n ) is driven to a ttl low state, it enables the max463?ax466 amplifier outputs. when e n is driven high, it disables the amplifier outputs. the disabled max463/max464 outputs exhibit a 250k typical resistance. because their internal feedback resistors are required to produce a gain of two, the max465/MAX466 exhibit a 1k disabled output resis- tance. le determines whether e n is latched by c s or operates independently. when the latch-enable input (le) is con- nected to v+, c s becomes the latch control for the e n input register. if c s ? is low, both the e n and a0 registers are transparent; once c s ? returns high, both registers are latched. max468 (no isolation resistor) gnd gnd a b 1 m s/div c load = 100pf a: v in , 500mv/div b: v out , 500mv/div figure 3b. step response without an isolation resistor max468 (with isolation resistor) gnd gnd a b 1 m s/div c load = 100pf, r isolation = 12 w a: v in , 500mv/div b: v out , 500mv/div figure 3c. step response with an isolation resistor
max463?ax470 two-channel, triple/quad rgb video switches and buffers ______________________________________________________________________________________ 11 when le is connected to ground, the e n register is transparent and independent of c s activity. this allows all max463?ax466 devices to be simultaneously shut down, regardless of the c s input state. simply connect le to ground and connect all e n inputs together (figure 5a). for the max464 and MAX466, le must be hard- wired to either v+ or ground (rather than driving le with a gate) to prevent crosstalk from the digital inputs to in0a. another option for output disable is to connect le to v+, parallel the outputs of several max463-MAX466s, and use e n to individually disable all devices but the one in use (figure 5b). when the outputs are disabled, the off isolation from the analog inputs to the amplifier outputs is typically 70db at 10mhz, all inputs driven with a 4v p-p sine wave and a 150 load impedance. figure 6 shows the test circuits used to measure isolation and crosstalk. table 1a. amplifier and channel selection with le = v+ table 1b. amplifier and channel selection with le = gnd disables amplifiers. outputs high-z. a0 register = channel b 1 1 0 disables amplifiers. outputs high-z. x 1 1 enables amplifier outputs, latches a0 register, programs outputs to output a or b, according to the setting of a0 at c s 's last edge. x 0 1 disables amplifiers. outputs high-z. a0 register = channel a 0 1 0 enables amplifier outputs. selects channel b. 1 0 0 enables amplifier outputs. selects channel a. 0 0 0 function a0 e n c s latches all input registers. changes nothing. enables amplifier outputs. selects channel b. enables amplifier outputs. selects channel a. x x 1 disables amplifiers. outputs high-z. x 1 0 1 0 0 0 0 0 function a0 e n c s max463? MAX466 max463? MAX466 max463? MAX466 max463? MAX466 shutdown le le en en cs en +5v +5v ao le en cs ao le (a) (b) figure 5. (a) simultaneous shutdown of all max463?ax466, (b) enable ( e n ) register latched by c s note: isolation resistors, if required, not shown.
max463?ax470 two-channel, triple/quad rgb video switches and buffers 12 ______________________________________________________________________________________ max463?ax466 max463?ax466 v in = 4v p-p at 10mhz, r s = 75 w * max467?ax470 max467?ax470 v in = 4v p-p at 10mhz, r s = 75 w * 150 w 75 w v in = 4v p-p at 10mhz, r s = 75 w * v in = 4v p-p at 10mhz, r s = 75 w * 150 w 75 w 150 w 75 w (a) (b) (c) (d) 150 w 150 w 150 w +5v en le 150 w 150 w 150 w 150 w * max464/MAX466/max468/max470 only figure 6. (a) max467?ax470 adjacent channel crosstalk, (b) max467?ax470 all-hostile crosstalk, (c) max463?ax466 all-hostile off isolation, (d) max463?ax466 all-hostile crosstalk
figure 7. higher-order rgb + sync video multiplexer max463?ax470 two-channel, triple/quad rgb video switches and buffers ______________________________________________________________________________________ 13 max464 ?v 4p2t video switch 75 w 75 w 75 w 75 w 75 w 75 w 75 w 75 w 10 11 12 13 8 9 6 7 4 5 2 3 1 ?v 14 23 24 25 26 27 28 ?v +5v +5v ?v +5v 22 21 20 19 18 17 16 15 gnd in3b gnd in2b v in1b v in0b gnd in3a gnd in2a gnd in1a v cs a0 en le in0a out0 v out1 gnd v+ out2 v+ out3 75 w 75 w max464 ?v 4p2t video switch 75 w 75 w 75 w 75 w 75 w 75 w 75 w 75 w 10 11 12 13 8 9 6 7 4 5 2 3 1 ?v 14 23 24 25 26 27 28 ?v +5v +5v ?v +5v 22 21 20 19 18 17 16 15 gnd in3b gnd in2b v in1b v in0b gnd in3a gnd in2a gnd in1a v cs a0 en le in0a out0 v out1 gnd v+ out2 v+ out3 75 w 75 w 75 w 75 w 75 w 75 w max470 out0 out1 out2 out3 in0 in1 in2 in3 ?v ?v ?v ?v v+ 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 v v v v v+ gnd gnd gnd 75 w 75 w 75 w 75 w 75 w 75 w 75 w 75 w from other max464s
max463?ax470 two-channel, triple/quad rgb video switches and buffers 14 ______________________________________________________________________________________ MAX466 ?v quad spdt video switch 75 w 75 w 75 w 75 w 75 w 75 w 75 w 75 w 10 11 12 13 8 9 6 7 4 5 2 3 1 ?v 14 23 24 25 26 27 28 ?v +5v +5v ?v +5v 22 21 20 19 18 17 16 15 gnd in3b gnd in2b v in1b v in0b gnd in3a gnd in2a gnd in1a v cs a0 en le in0a out0 v out1 gnd v+ out2 v+ out3 50 w 75 w MAX466 ?v quad spdt video switch 75 w 75 w 75 w 75 w 75 w 75 w 75 w 75 w 10 11 12 13 8 9 6 7 4 5 2 3 1 ?v 14 23 24 25 26 27 28 ?v +5v +5v ?v +5v 22 21 20 19 18 17 16 15 gnd in3b gnd in2b v in1b v in0b gnd in3a gnd in2a gnd in1a v cs a0 en le in0a out0 v out1 gnd v+ out2 v+ out3 50 w 75 w 50 w 75 w 50 w 75 w 22 w 22 w 22 w 22 w 22 w 22 w 22 w 22 w a1 a0 cs figure 8. 1-of-4 rgb + sync video multiplexer
max463?ax470 two-channel, triple/quad rgb video switches and buffers ______________________________________________________________________________________ 15 __________applications information higher-order rgb + sync video multiplexing higher-order rgb video multiplexers can be realized by paralleling several max463/max464s. connect le to v+ and use c s ? and e n to disable all devices but the one in use. since the disabled output resistance of the max463/max464 is 250k , several devices may be paralleled to form larger rgb video multiplexer arrays without signal degradation. connect series resistors at each amplifier's output to isolate the disabled output capacitance of each paralleled device, and use a max469 or max470 to drive the output coaxial cables (see figure 7). paralleling MAX466s to switch 1-of-4 rgb + sync signal inputs figure 8 shows a 1-of-4 rgb + sync video mux/amp circuit. the 1k disabled output resistance limits the number of paralleled max465/MAX466s to no more than two. the amplifier outputs are connected after a 22 isolation resistor and ahead of a 50 back-termi- nation resistor, which isolates the active amplifier out- put from the capacitive load (5pf typ) presented by the inactive output of the second MAX466. impedance mismatching is minimal, and the signal gain at the cable end is near 1. this minimizes ringing in the out- put signals. for multiplexing more than two devices, see the section higher order rgb + sync video multiplexing, above. 28 27 26 25 24 23 22 21 20 19 18 17 16 15 top view gnd in1a gnd in2a gnd in3a v- in0b v- in1b gnd in2b gnd in3b dip/so 1 2 3 4 5 6 7 8 9 10 11 12 13 14 in0a le en a0 cs v- out0 v- out1 gnd v+ out2 v+ out3 max464 MAX466 4p2t switch in0 gnd in1 v- v- in2 gnd in3 dip/so 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 out0 gnd out1 v- v- out2 v+ out3 max468 max470 quad buffers in0 gnd in1 v- v- in2 gnd gnd dip/so max467 max469 triple (rgb) buffers 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 out0 gnd out1 v- v- out2 v+ gnd _____________________________________________pin configurations (continued)
max463?ax470 two-channel, triple/quad rgb video switches and buffers 16 ______________________________________________________________________________________ in0a in0b max465 MAX466 out0 logic MAX466 only in1a in1b out1 in2a in2b out2 in3a in3b out3 10? 0.1? -5v 75 w 75 w 75 w 75 w 75 w 75 w 75 w 75 w a0 10? 0.1? +5v a v = 2 a v = 2 a v = 2 a v = 2 __________typical operating circuit _ordering information (continued) * dice are specified at t a = +25?, dc parameters only. part temp. range pin-package max464 cni 0? to +70? 28 narrow plastic dip max464cwi 0? to +70? 28 wide so max464c/d 0? to +70? dice* max464eni -40? to +85? 28 narrow plastic dip max465 cng 0? to +70? 24 narrow plastic dip max465cwg 0? to +70? 24 wide so max465c/d 0? to +70? dice* max465eng -40? to +85? 24 narrow plastic dip max465ewg -40? to +85? 24 wide so max467ewe -40? to +85? 16 wide so max467epe -40? to +85? 16 plastic dip max467c/d 0? to +70? dice* max467cwe 0? to +70? 16 wide so max467 cpe 0? to +70? 16 plastic dip MAX466eni -40? to +85? 28 narrow plastic dip MAX466c/d 0? to +70? dice* MAX466cwi 0? to +70? 28 wide so MAX466 cni 0? to +70? 28 narrow plastic dip max470epe -40? to +85? 16 plastic dip max470c/d 0? to +70? dice* max470cwe 0? to +70? 16 wide so max470 cpe 0? to +70? 16 plastic dip max469ewe -40? to +85? 16 wide so max469epe -40? to +85? 16 plastic dip max469c/d 0? to +70? dice* max469cwe 0? to +70? 16 wide so max469 cpe 0? to +70? 16 plastic dip max468epe -40? to +85? 16 plastic dip max468c/d 0? to +70? dice* max468cwe 0? to +70? 16 wide so max468 cpe 0? to +70? 16 plastic dip max464ewi -40? to +85? 28 wide so MAX466ewi -40? to +85? 28 wide so max468ewe -40? to +85? 16 wide so max470ewe -40? to +85? 16 wide so

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