the msk 613 is a high voltage/high speed amplifier designed to provide large voltage swings at high slew rates in wideband systems. the true inverting op-amp topology employed in the msk 613 provides excellent d.c. specifica- tions such as input offset voltage and input bias current. these attributes are important in amplifiers that will be used in high gain configurations since the input error voltages will be multiplied by the system gain. the msk 613 achieves impressive settling time specifications by employing a feed forward a.c. path through the amplifier, however, the device is internally configured in inverting mode to utilize this benefit. internal compensation for gains of -5v/v or greater keeps the msk 613 stable in this range. the msk 613 is packaged in a space efficient, hermetically sealed, 36 pin flatpack. 4707 dey road liverpool, n.y. 13088 m.s.kennedy corp. (315) 701-6751 features: ultra low quiescent current - 10ma for high voltage 80v peak to peak output voltage swing slew rate - 3500v/s typical input offset voltage only - 1mv typ. output current - 150ma peak typ. adjustable vhv power supply minimizes power dissipation high voltage/high speed surface mount amplifier 613 iso 9001 certified by dscc rev. b 8/00 1 mil-prf-38534 qualified description: fast settling high voltage amplifier high resolution crt monitor ultra high performance video processing crt beam intensity control varactor tuned vco driver automatic test equipment typical applications 1 2 3 4 5 6 7 8 9 n/c comp n/c +vcc n/c n/c case gnd gnd n/c pin-out information 10 11 12 13 14 15 16 17 18 n/c -vcc n/c n/c input n/c n/c n/c n/c 19 20 21 22 23 24 25 26 27 n/c -vhv -vhv -vsc -vsc gnd gnd n/c vout 28 29 30 31 32 33 34 35 36 vout n/c case gnd gnd +vsc +vsc +vhv +vhv n/c equivalent schematic
65v dc v cc 18v dc 25c/w v in =0 @ +v cc v in =0 @ -v cc v in =0 @ +v hv v in =0 @ -v hv v in =0 v cc v hv f=1khz f=1khz v 0 =40v v 0 =1.0v v 0 =40v v o =40v f=1khz a v =-10v/v v o =40v a v =-10v/v v o =40v a v =-10v/v v o =40v static input offset voltage drift dynamic characteristics output voltage swing peak output current full power output unity gain bandwidth slew rate voltage gain settling time to 1% settling time to 0.1% settling time to 0.05% group a subgroup 1,2,3 1,2,3 1,2,3 1,2,3 1 2,3 1 2,3 2,3 - - 4 - - - 4 4 - - - -65c to +150c 300c -40 c to +85c -55c to +125c 150c absolute maximum ratings t st t ld t c t j storage temperature range lead temperature range (10 seconds) case operating temperature msk613 msk613h junction temperature supply voltage input voltage range supply voltage (input stage) thermal resistance (output devices) v hv v in v cc q jc typ. 1.0 12 10 12 0.2 1.0 50 100 15 15 55 45 150 12 100 3500 100 100 400 750 min. - - - - - - - - - 12 40 40 100 5 80 2000 90 - - - max. 3.5 30 15 15 5.0 10.0 250 500 50 18 65 - - - - - - - - 1.5 min. - - - - - - - - - 12 40 40 100 4 80 2000 90 - - - max. 4.0 32 15 15 5.0 - 500 - - 18 65 - - - - - - - - 1.6 msk 613h msk 613 parameter test conditions electrical specifications 1 ma ma ma ma mv mv na na v/c v v v ma mhz mhz v/s db ns ns s units typ. 1.0 15 10 10 1.0 2.0 50 100 15 15 55 45 150 12 100 3500 100 100 400 750 1 2 3 4 5 unless otherwise specified, v cc =15v dc , v hv =55v dc , c l =8pf (probe capacitance) and a v =10v/v. this parameter is guaranteed by design but not tested. typical parameters are representative of actual device performance but are for reference only. industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise specified. military grade devices ('h' suffix) shall be 100% tested to subgroups 1,2,3 and 4. subgroup 1,4 t a =t c =+25c subgroup 2,5 t a =t c =+125c subgroup 3,6 t a =t c =-55c notes: quiescent current input offset voltage input bias current v in =0 power supply range 2 2 2 2 2 2 2 2 rev. b 8/00 2 2 3 2
application notes feed forward topology transition time optimization of the msk 613 follows the same basic rules as most any other amplifier. best transition times will be realized with minimum load capacitance, minimum ex- ternal feedback resistance and lowest circuit gain. transition times will degrade if the output is driven too close to either supply rail. feedback and input resistor values will affect tran- sition time as well. see figure 1 and table 1 for recommended component values. current limit figure 2 is a possible active short circuit protection scheme for the msk 613. the following formula may be used for set- ting current limit: current limit ? 0.6v / rsc r base must be selected based on the value of v hv as fol- lows: r base = ((+v hv - (-v hv )) - 1.2v) / 4ma this formula guarantees that q2 and q4 will always have suf- ficient base current to be in operation. this circuit can be made tolerant of high frequency output current spikes with the addi- tion of c sc . the corresponding time constant would be: t = (r sc ) (c sc ) a common value for c sc is approximately 1000pf. if current limit is unnecessary, short pins20 & 21 to pins 22 & 23 and pins 34 & 35 to pins 32 & 33 as shown in figure 1. 1k w w w w w 249 w w w w w 100 w w w w w -r in -10v/v -20v/v -50v/v c f 0.5-5pf n/a n/a 10k w w w w w 5k w w w w w 5k w w w w w voltage gain r f table 1 figure 2 internal compensation since the msk 613 is a high voltage amplifier, it is com- monly used in circuits employing large gains. therefore, the internal compensation was chosen for gains of -5v/v or greater. in circuits running at gains of less than -5v/v, the user can further compensate the device by adding compensation net- works at the input or feedback node. pin 2 (comp) should be bypassed with a 1.0uf ceramic capacitor to +v hv for all appli- cations. transition times high voltage supplies the positive and negative high voltage supplies on the msk 613 can be adjusted to reduce power dissipation. the output of the msk 613 will typically swing to within 8v of either high voltage power supply rail. therefore, if the system in question only needs the output of the amplifier to swing 40v peak, the power supply rails could be set to 50v safely. for best performance, the minimum value of v hv should be 40v dc . unbalanced power supply rails are also allowed as long as one or the other is not decreased to below 30v or above 80v. the high voltage and low voltage power supplies should be decoupled as shown in figure 1. the msk 613 employs a circuit topology known as "feed forward". this inverting configuration allows the user to real- ize the excellent d.c. input characteristics of a differential am- plifier without losing system bandwidth. the incoming signal is split at the input into its a.c. and d.c. component. the d.c. component is allowed to run through the differential amplifier where any common mode noise is rejected. the a.c. compo- nent is "fed forward" to the output section through a very high speed linear amplifier where it is mixed back together with the d.c. component. the result is an amplifier with most of the benefits of a differential amplifier without the loss in system bandwidth. rev. b 8/00 3 figure 1
ordering information screening level msk613 industrial the information contained herein is believed to be accurate at the time of printing. msk reserves the right to make changes to its products or specifications without notice, however, and assumes no liability for the use of its products. mechanical specifications m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com msk613h all dimensions are 0.010 inches unless otherwise labeled part number note: esd triangle indicates pin 1. military-mil-prf-38534 rev. b 8/00 4 please contact factory for lead form options if desired
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