4707 dey road liverpool, n.y. 13088 m.s.kennedy corp. (315) 701-6751 features: ultra low quiescent current - 13ma for high voltage 140v peak to peak output voltage swing slew rate - 5000v/s typical settling time to 0.05% - 1.5s max. input offset voltage only - 5mv max. output current - 250ma peak adjustable vhv power supply minimizes power dissipation compact package offers superior power dissipation capability contact msk for mil-prf-38534 qualification status fast settling high voltage amplifier 612 +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 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 pin-out information typical applications the msk 612 is a high voltage fast settling amplifier designed to provide large voltage swings at high slew rates in wideband systems. the true inverting op-amp topology employed in the msk 612 provides excellent d.c. speci- fications 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 612 achieves impressive settling time specifications by employing a feed forward a.c. path through the amplifier, how- ever, the device is internally configured in inverting mode to utilize this benefit. internal compensation for gains of - 5v/v or greater keeps the msk 612 stable in this range. the msk 612 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 certified rev. b 3/06 1
80v dc v cc 18v dc 30c/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 =50v v 0 =1.0v v 0 =50v v o =50v f=1khz a v =-10v/v v o =50v a v =-10v/v v o =50v a v =-10v/v v o =50v 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 - - 4 -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 msk612 msk612b/e junction temperature supply voltage input voltage range supply voltage (input stage) thermal resistance (output devices) v hv v in v cc jc typ. 1.0 12 12 12 0.2 1.0 50 100 5 15 65 58 250 12 100 5000 100 100 400 750 min. - - - - - - - - - 12 50 50 200 5 80 2000 90 - - - max. 3.5 30 20 20 5.0 10 500 750 50 18 80 - - - - - - - - 1.5 min. - - - - - - - - - 12 50 50 200 4 80 2000 90 - - - max. 4.0 32 22 22 10 - 750 - - 18 80 - - - - - - - - 1.6 msk 612b/e msk 612 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 12 12 1.0 2.0 50 100 5 15 65 58 250 12 100 5000 100 100 400 750 1 2 3 4 5 6 unless otherwise specified, v cc =15v dc , v hv =65v 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 and "e" suffix 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 continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle. 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 3/06 2 6
application notes feed forward topology transition time optimization of the msk 612 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 a possible active short circuit protection scheme for the msk 612. 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 pin 7 to pin 8 and pin 11 to pin 12 as shown in figure 1. 1k ? ? ? ? ? 249 ? ? ? ? ? 100 ? ? ? ? ? -r in -10v/v -20v/v -50v/v c f 0.5-5pf n/a n/a 10k ? ? ? ? ? 5k ? ? ? ? ? 5k ? ? ? ? ? voltage gain r f table 1 figure 2 internal compensation since the msk 612 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 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 612 can be adjusted to reduce power dissipation. the output of the msk 612 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 50v 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 612 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 3/06 3
ordering information screening level msk612 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. please visit our website for the most recent revision of this datasheet. contact msk for mil-prf-38534 qualification status. mechanical specifications m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com msk612e all dimensions are 0.010 inches unless otherwise labeled part number rev. b 3/06 note: esd triangle indicates pin 1. extended reliability 4 weight=21 grams typ. msk612b mil-prf-38534 class h
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