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ISO 9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP. FEATURES:
WIDE BANDWIDTH HIGH VOLTAGE AMPLIFIER
601
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088 Ultra Low Quiescent Current - 15mA for High Voltage 220V Peak to Peak Output Voltage Swing Slew Rate - 3000V/S Typical Gain Bandwidth Product - 200 MHz Typical Full Power Output Frequency - 1 MHz Typical Output Current - 100mA Peak Adjustable VHV Power Supplies Minimizes Power Dissipation Compact Package Offers Superior Power Dissipation
MIL-PRF-38534 QUALIFIED
DESCRIPTION:
The MSK 601(B) is a high voltage wideband amplifier designed to provide very large voltage swings at high slew rates in wideband systems. The true inverting op-amp topology employed in the MSK 601 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 601 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 601 stable in this range. The MSK 601 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 Very High Voltage Amplifier High Resolution CRT Monitor 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. A 8/00
ABSOLUTE MAXIMUM RATINGS

TC TJ
ELECTRICAL SPECIFICATIONS
Parameter STATIC VIN=0 @ +VCC Quiescent Current VIN=0 @ -VCC VIN=0 @ +VHV VIN=0 @ -VHV Input Offset Voltage VIN=0 1,2,3 1,2,3 1,2,3 1,2,3 1 2,3 1 2,3 VIN=0 VCC VHV f=1KHz f=1KHz V0=100V V0=1.0V V0=90V f=1KHz AV=-10V/V AV=-10V/V 2,3 4 4 4 12 50 1.5 15 20 20 1.0 2.0 50 100 10 15 2.0 25 30 30 5.0 10.0 250 350 50 18 12 1.8 20 25 25 1.0 2.0 50 100 10 15 120 2.5 30 35 35 10 500 18 150 mA mA mA mA mV mV nA nA V/C V V V mA MHz MHz V/S dB nS nS Test Conditions 1 Group A Subgroup Min. MSK 601B Typ. Max. Min. MSK 601 Typ. Max. Units
Input Bias Current Input Offset Voltage Drift 2 Power Supply Range DYNAMIC CHARACTERISTICS Output Voltage Swing Peak Output Current 2 Full Power Output 2 Unity Gain Bandwidth 2 Slew Rate Voltage Gain 2 Settling Time to 1% 2 Settling Time to 0.1% 2
120 150 50 -
110 115 200 250 1 50 2000 90 2 70 3000 95 250 1200
110 115 200 250 1 50 1500 90 2 70 3000 95 250 1200
NOTES:
1 2 3 4 5 Unless otherwise specified, VCC=15VDC, VHV=120VDC, 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. A 8/00

VHV VIN VCC JC
Supply Voltage Input Voltage Range Supply Voltage (Input Stage) Thermal Resistance (Output Devices)
150VDC VCC 18VDC 18C/W
TST TLD
Storage Temperature Range -65C to +150C Lead Temperature Range 300C (10 Seconds) Case Operating Temperature MSK601 -40C to +85C MSK601B -55C to +125C Junction Temperature 150C
APPLICATION NOTES FEED FORWARD TOPOLOGY
The MSK 601 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 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. 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.
INTERNAL COMPENSATION
Since the MSK 601 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 601. 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 positive and negative high voltage supplies on the MSK 601 can be adjusted to reduce power dissipation. The output of the MSK 601 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. For best performance, the minimum value of VHV should be 50VDC. Unbalanced power supply rails are also allowed as long as one or the other is not decreased to below 30V or above 150V. The high voltage and low voltage power supplies should be decoupled as shown in Figure 1.
TRANSITION TIMES
Transition time optimization of the MSK 601 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.
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
Figure 1
3
Figure 2
Rev. A 8/00
MECHANICAL SPECIFICATIONS
MSK601
NOTE: ESD Triangle indicates Pin 1. ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED
ORDERING INFORMATION
Part Number MSK601 MSK601B 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. A 8/00

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