m.s.kennedy corp. (315) 701-6751 604 +vhv +vsc output case/ground -vsc -vhv 1 2 3 4 5 6 12 11 10 9 8 7 comp +vcc ground -vcc -input no connection wideband high voltage amplifier high resolution crt monitor grid drive ultra high performance video processing crt beam intensity control varactor tuned vco driver automatic test equipment pin-out information typical applications the msk 604(b) is a high voltage wideband amplifier designed to provide large negative voltage swings at high slew rates in wideband systems. the true inverting op-amp topology employed in the msk 604 provides excellent d.c. specifications 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 604 achieves impressive slew rate 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 604 stable in this range. the msk 604 is packaged in a space efficient, hermetically sealed, 12 pin power dual in line package that has a high thermal conductivity for efficient device cooling. description: equivalent schematic mil-prf-38534 qualified iso 9001 certified by dscc 4707 dey road liverpool, n.y. 13088 features: negative going output voltage ultra low quiescent current - 10ma for high voltage 95v peak to peak output voltage swing slew rate - 3000v/s typical full power output frequency - 2 mhz typical output current - 250ma peak adjustable - vhv power supply minimizes power dissipation compact package offers superior power dissipation. negative output wide bandwidth high voltage amplifier rev. b 8/00 1
static input offset voltage drift power supply range 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% v in =0 @ +v cc v in =0 @ -v cc v in =0 v cc +v hv -v hv f=1khz f=1khz v o =70v v o =1.0v v o =80v f=1khz a v =-10v/v v o =50v a v =-10v/v v o =50v +20,-120vdc v cc 18v dc 18c/w -65c to +150c 300c -40c 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 msk604 msk604b junction temperature supply voltage input voltage range supply voltage (input stage) thermal resistance (output devices) v hv v in v cc q jc 1 2 3 4 5 notes: unless otherwise specified, v cc =15v dc , +v hv =+15v dc , -v hv =-100v 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 ('b' 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 max. 2.5 30 20 - 20 - 10 - 500 - - 18 +20 -120 - - - - - - - - max. 2.0 25 15 17 15 17 5.0 10.0 250 350 50 18 +20 -120 - - - - - - - - min. - - - - - - - - - - - 12 0 -50 -90/+5 100 1 50 2000 90 - - typ. 1.8 20 10 - 10 - 1.0 2.0 50 100 10 15 +15 -100 -95/8 250 2 100 3000 100 200 1000 msk 604b msk 604 parameter test conditions electrical specifications ma ma ma ma ma ma mv mv na na v/c v v v v ma mhz mhz v/s db ns ns units 4 3 min. - - - - - - - - - - - 12 0 -50 -90/+5 100 1 50 2000 94 - - typ. 1.5 15 10 14 10 14 1.0 2.0 50 100 10 15 +15 -100 -95/8 250 2 100 3000 100 200 1000 v in =0 2 2 2 2 2 2 2 v in =0 @ +v hv v in =0 @ -v hv input offset voltage quiescent current input bias current 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 - - - rev. b 8/00 2
application notes transition time optimization of the msk 604 follows the same basic rules as most any other amplifier. best transition times will be realized with minumum 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. figure 1 current limit figure 2 is the recommended active short circuit protection scheme for the msk 604. the following formula may be used for setting 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 pin 7 to pin 8 and pin 11 to pin 12 as shown in figure 1. 1k w w w w w 499 w w w w w 402 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 10k w w w w w 20k w w w w w voltage gain r f table 1 figure 2 internal compensation since the msk 604 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 1 (comp) should be bypassed with a 0.1uf ceramic capacitor to +v hv for all appli- cations. high voltage supplies the negative high voltage supply on the msk 604 can be adjusted to reduce power dissipation. the output of the msk 604 will typically swing to within 5v of the -v hv 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 mini- mum value of -v hv should be -50v dc. the high voltage and low voltage power supplies should be decoupled as shown in figure 1. the +v hv supply can range from ground to +20v dc depending on application requirements. transition times feed forward topology the msk 604 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 it's a.c. and d.c. components. the d.c. component is allowed to run through the differential am- plifier where any common mode noise is rejected. the a.c. component 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
ordering information screening level msk604 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 msk604b all dimensions are 0.010 inches unless otherwise labeled part number note: esd triangle indicates pin 1. military-mil-prf-38534 msk604 rev. b 8/00 4
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