4707 dey road liverpool, n.y. 13088 (315) 701-6751 features: mil-prf-38534 qualified iso-9001 certified by dscc equivalent schematic m.s.kennedy corp. the msk 164 is an ultra high voltage monolithic mosfet operational amplifier ideally suited for electrostatic transducer and electrostatic deflection applications. with a total supply voltage rating of 350 volts and 60ma of available output current, the msk 164 is also an excellent low cost choice for high voltage piezo drive circuits. the mosfet output frees the msk 164 from secondary breakdown limitations and power dissipation is kept to a mini- mum with a quiescent current rating of only 2ma. the msk 164 has user adjustable compensation and output null pins and is packaged in a 14 pin power dip with bolt down tabs. description: monolithic mos technology external compensation and null capability high voltage operation : 350v low quiescent current : 2ma max. high output current : 60ma min. no second breakdown high speed : 40v/s typ. low cost 14 13 12 11 10 9 8 pin-out information 1 2 3 4 5 6 7 typical applications piezo electric positioning electrostatic deflection computer to vacuum tube interface ultra high voltage op-amp applications balance 1 balance 2 -vcc +vcc output drive comp 1 comp 2 non-inverting input inverting input n/c n/c n/c n/c current sense ultra high voltage operational amplifier 164 MSK164 rev. a 8/00 1
350v 60ma 120ma 16v vcc 150c storage temperature lead temperature case operating temperature (MSK164b) (MSK164) thermal resistance (dc) junction to case -65c to +150c 300c -55c to +125c -40c to +85c 12c/w total supply voltage output current (within s.o.a.) output current peak input voltage (differential) input voltage (common mode) junction temperature 1 2 3 4 5 6 7 8 9 absolute maximum ratings t st t ld t c r th v cc i out i outp v ind v in t j unless otherwise noted c c =18pf, r c =2.2k w , v cc = 150vdc, null pins 1 and 2 are n/c. derate maximum supply voltage 0.5v/c below t c =+25c. no derating is needed above t c =25c. a v =-10v/v measured in false summing junction circuit. devices shall be capable of meeting the parameter, but need not be tested. typical parameters are for reference only. industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise requested. military grade devices ('b' suffix) shall be 100% tested to subgroups 1,2,3 and 4. subgroup 5 and 6 testing available upon request. subgroup 1,4 t c =+25c subgroup 2,5 t c =+125c subgroup 3,6 t a =-55c electrical specifications are derated for power supply voltages less than 50vdc. v in =0v v in =0v v in =0v v in =0v v cm =0v (dc) v cm =90vdc 1hz f 10hz i out =40ma peak v out =max c c =10pf v out =280v pp no load r cl =0 w c c =10pf 10v step a v =+1v/v c c =open f=15hz r l =5k w group a subgroup - 1 2 3 1 2,3 1 1,3 2 - - - - 4 4 - - - - 4 4 static supply voltage range quiescent current input offset voltage offset voltage drift offset voltage vs vcc input bias current input impedance input capacitance common mode rejection noise output output voltage swing output current power bandwidth resistance settling time to 0.1% capacitive load transfer characteristics slew rate open loop voltage gain typ. 150 1.4 2.0 1.0 15 40 20 5 - 10 5 94 50 141 120 26 150 12 - 40 106 min. 50 - - - - - - - - - - 84 - 138 60 - - - 10 20 94 min. 50 - - - - - - - - - - 84 - 138 60 - - - 10 20 94 max. 175 2.0 - - 30 - 32 100 - - - - - - - - - - - - - typ. 150 1.4 - - 15 40 20 5 - 10 5 94 50 141 120 26 150 12 - 40 106 units v ma ma ma mv v/c v/v pa na w pf db v rms v ma khz w s nf v/s db MSK164b MSK164 2 parameter max. 175 2.0 3.0 2.1 30 65 32 50 50 - - - - - - - - - - - - 4 test conditions electrical specifications 4 4 1 4 4 3 4 notes: 4 4 4 2 9 4 4 11 11 rev. a 8/00 2
application notes r cl =3/i lim v r =i o r cl * current limit resistor value can be calculated as follows: it is recommended that the user set up the value of current limit as close as possible to the maximum expected output current to protect the amplifier. the minumum value of current limit resistance is 33 ohms. the maximum practical value is 500 ohms. current limit will vary with case temperature. refer to the typical performance graphs as a guide. since load current passes through the current limit resistor, a loss in output volt- age swing will occur. the following formula approximates out- put voltage swing reduction: when the device is in current limit, there will be spurious oscil- lations present on the negative half cycle. the frequency of the oscillation is application dependent and can not be pre- dicted. oscillation will cease when the device comes out of current limit. current limit input protection input protection circuitry within the msk 164 will clip differ- ential input voltages greater than 16 volts. the inputs are also protected against common mode voltages up to the supply rails as well as static discharge. there are 300 ohm current limiting resistors in series with each input. these resistors may be- come damaged in the event the input overload is capable of driving currents above 1ma. if severe overload conditions are expected, external input current limiting resistors are recom- mended. output snubber network a 100 ohm resistor and a 330pf capacitor connected in se- ries from the output of the amplifier to ground is recommended for applications where load capacitance is less than 330pf. for larger values of load capacitance, the output snubber net- work may be omitted. if loop stability becomes a problem due to excessively high load capacitance, a 100 ohm resistor may be added between the output of the amplifier (the junction of r cl and pin 8) and the load. a small tradeoff with bandwidth must be made in this configuration. the graph below illus- trates the effect of capacitive load on open loop gain. note that the snubber capacitor must have a voltage rating greater than or equal to the total rail to rail power supply voltage. safe operating area (soa) the mosfet output stage of this power operational ampli- fier has two distinct limitations: 1. the current handling capability of the die metallization. 2. the junction temperature of the output mosfet's. note: the output stage is protected against transient flyback. however, for protection against sustained, high energy flyback, external fast-recovery reverse biased diodes should be connected from the output to ground. the msk 164 has sufficient phase margin when compen- sated for unity gain to be stable with capacitive loads of at least 10nf. however, it is recommended that the parallel sum of the input and feedback resistor be 1000 ohms or less for closed loop gains of ten or less to minimize phase shift caused by the r-c network formed by the input resistor, feedback re- sistor and input capacitance. the user can tailor the perfor- mance of the msk 164 to their application using the external compensation pins. the graphs of small signal gain and phase as well as the graphs of slew rate and power response demon- strate the effect of various forms of compensation. the com- pensation capacitor must be rated at 350 volts working voltage if maximum power supply voltages are used. the compensa- tion resistor and capacitor lead lengths must be kept as short as possible to minimize spurious oscillations. a high quality npo capacitor is recommended for the compensation capaci- tor. stability external compensation is only necessary at gains of 30v/v or less. for larger gains, the compensation resistor and capaci- tor may be omitted. an effective method of checking amplifier stability is to apply the worst case capacitive load to the output of the amplifier and drive a small signal square wave across it. if overshoot is less than 25%, the system will generally be stable. external compensation rev. a 8/00 3
typical performance curves rev. a 8/00 4
mechanical specifications esd triangle indicates pin 1. all dimensions are 0.010 inches unless otherwise labeled. rev. a 8/00 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. m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com screening level part number MSK164 MSK164b industrial military-mil-prf-38534 ordering information MSK164 5
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