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| ISO 9001 CERTIFIED BY DSCC M.S.KENNEDY CORP. FEATURES: NEGATIVE OUTPUT WIDE BANDWIDTH HIGH VOLTAGE AMPLIFIER 4707 Dey Road Liverpool, N.Y. 13088 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. 604 (315) 701-6751 MIL-PRF-38534 QUALIFIED DESCRIPTION: 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. EQUIVALENT SCHEMATIC TYPICAL APPLICATIONS 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 1 2 3 4 5 6 1 PIN-OUT INFORMATION COMP +VCC GROUND -VCC -INPUT NO CONNECTION 12 11 10 9 8 7 +VHV +VSC OUTPUT CASE/GROUND -VSC -VHV Rev. B 8/00 ABSOLUTE MAXIMUM RATINGS TC TJ ELECTRICAL SPECIFICATIONS Parameter STATIC VIN=0 @ +VCC VIN=0 @ -VCC Quiescent Current VIN=0 @ +VHV 1,2,3 1,2,3 1 2,3 1 2,3 1 2,3 1 2,3 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 2 2 2 2 2 2 2 Test Conditions Group A Subgroup MSK 604B 4 Min. 12 0 -50 Typ. 1.5 15 10 14 10 14 1.0 50 100 10 15 +15 -100 Max. 2.0 25 15 17 15 17 5.0 250 350 50 18 +20 -120 - MSK 604 3 Min. 12 0 -50 Typ. 1.8 20 10 10 1.0 2.0 50 100 10 15 +15 -100 Max. 2.5 30 20 20 10 500 18 +20 -120 - VIN=0 @ -VHV Input Offset Voltage Input Bias Current VIN=0 VCC +VHV -VHV f=1KHz f=1KHz VO=70V VO=1.0V VO=80V f=1KHz AV=-10V/V VO=50V AV=-10V/V VO=50V VIN=0 2.0 10.0 2,3 4 4 - -90/+5 -95/8 100 250 1 50 2000 94 2 100 3000 100 200 1000 -90/+5 -95/8 100 250 1 50 2000 90 2 100 3000 100 200 1000 Settling Time to 1% Settling Time to 0.1% NOTES: 1 2 3 4 5 Unless otherwise specified, VCC=15VDC, +VHV=+15VDC, -VHV=-100V CL=8pF (probe capacitance) and AV=-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 TA=TC=+25C Subgroup 2,5 TA=TC=+125C Subgroup 3,6 TA=TC=-55C 2 Rev. B 8/00 VHV VIN VCC JC Supply Voltage Input Voltage Range Supply Voltage (Input Stage) Thermal Resistance (Output Devices) +20,-120VDC VCC 18VDC 18C/W TST TLD Storage Temperature Range -65C to +150C Lead Temperature Range 300C (10 Seconds) Case Operating Temperature MSK604 -40C to +85C MSK604B -55C to +125C Junction Temperature 150C Units mA mA mA mA mA mA mV mV nA nA V/C V V V V mA MHz MHz V/S dB nS nS APPLICATION NOTES FEED FORWARD TOPOLOGY The MSK 604 employs a circuit topology known as "feed forward". This inverting configuration allows the user to realize the excellent D.C. input characteristics of a differential amplifier 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 amplifier 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. VOLTAGE GAIN -10V/V -20V/V -50V/V -RIN 1K 499 402 RF 10K 10K 20K CF 0.5-5pF N/A N/A Table 1 INTERNAL COMPENSATION Since the MSK 604 is a high voltage amplifier, it is commonly 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 networks at the input or feedback node. Pin 1 (comp) should be bypassed with a 0.1uF ceramic capacitor to +VHV for all applications. 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 RBASE must be selected based on the value of VHV as follows: RBASE = ((+VHV - (-VHV)) - 1.2V) / 4mA This formula guarantees that Q2 and Q4 will always have sufficient base current to be in operation. This circuit can be made tolerant of high frequency output current spikes with the addition of CSC. The corresponding time constant would be: T = (RSC) (CSC) A common value for CSC 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. 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 -VHV 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 -VHV should be -50VDC. The high voltage and low voltage power supplies should be decoupled as shown in Figure 1. The +VHV supply can range from ground to +20VDC depending on application requirements. TRANSITION TIMES 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 external 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 transition time as well. See Figure 1 and Table 1 for recommended component values. Figure 1 3 Figure 2 Rev. B 8/00 MECHANICAL SPECIFICATIONS MSK604 NOTE: ESD Triangle indicates Pin 1. ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED ORDERING INFORMATION Part Number MSK604 MSK604B Screening Level Industrial Military-Mil-PRF-38534 4707 Dey Road, Liverpool, New York 13088 Phone (315) 701-6751 FAX (315) 701-6752 www.mskennedy.com 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. 4 Rev. B 8/00 |
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