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ISO 9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP. FEATURES:
ULTRA HIGH SLEW RATE HIGH VOLTAGE AMPLIFIER
611
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088 Low Quiescent Current - 25mA for High Voltage Stage 110V Peak to Peak Output Voltage Swing Slew Rate - 6000V/S Typical @ 100Vpp Small Signal Rise Time - 6nS Typical Power Output Frequency - 7 MHz Typical Output Current - 150mA Peak Adjustable VHV Power Supply Minimizes Power Dissipation Compact Package Offers Superior Power Dissipation
MIL-PRF-38534 QUALIFIED
DESCRIPTION:
The MSK 611 is a high voltage ultra high slew rate amplifier designed to provide large voltage swings in wideband systems. The true inverting op-amp topology employed in the MSK 611 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 611 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 611 stable in this range. The MSK 611 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 Ultra High Performance Video Processing CRT Beam Intensity Control Varactor Tuned VCO Driver Automatic Test Equipment 1 2 3 4 5 6
PIN-OUT INFORMATION
COMP +VCC GROUND N/C -INPUT N/C
1
12 11 10 9 8 7
+VHV +VSC OUTPUT CASE/GROUND -VSC -VCC
Rev. B 8/00
ABSOLUTE MAXIMUM RATINGS

TC TJ
ELECTRICAL SPECIFICATIONS
Group A Subgroup @ +VCC Quiescent Current VIN=0 @ -VCC
7
Parameter STATIC
Test Conditions 1
MSK 611B Min. 12 50 -18 100 5 5500 80 Typ. 1.0 30 25 11 1.0 2.0 50 100 10 15 120 -15 110 7 150 6000 100 100 250 Max. 2.0 40 40 15 5.0 10.0 250 500 50 18 130 0 Min. 12 50 -18 100 4 5500 80 -
MSK 611 Typ. 1.0 30 25 11 1.0 2.0 50 100 10 15 120 -15 110 7 150 6000 100 100 250 Max. 2.0 45 45 20 10 500 18 130 0 -
1,2,3 1,2,3 1,2,3 1,2,3 1 2,3 1 2,3
@ +VHV @ -VSC
Input Offset Voltage
VIN=0
Input Bias Current Input Offset Voltage Drift 2 VIN=0 VCC Power Supply Range 2 DYNAMIC CHARACTERISTICS Output Voltage Swing 6 Peak Output Current 2 Full Power Output Frequency 2 Unity Gain Bandwidth 2 Slew Rate Voltage Gain 2 Settling Time to 1% 2 Settling Time to 0.1% 2 f=1KHz f=1KHz V0=100Vpp V0=1Vpp V0=100Vpp f=1KHz AV=-10V/V VO=50Vpp AV=-10V/V VO=50Vpp +VHV, +VSC -VSC
2,3 4 4 4 4 4 -
125 150
125 150
NOTES:
1 2 3 4 5 Unless otherwise specified, VCC=15VDC, +VHV=+VSC=+120VDC, -VSC=-15VDC, CL=5pF (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 TC=+25C Subgroup 2,5 TJ=+125C Subgroup 3,6 TA=-55C 6 The output voltage swing is typically within 8 volts of each VSC supply setting. 7 Includes +VSC quiescent current.
2
Rev. B 8/00

+VHV,+VSC -VSC VIN VCC JC
Supply Voltage Supply Voltage Input Voltage Range Supply Voltage (Input Stage) Thermal Resistance (Output Devices)
+130VDC -18VDC VCC 18VDC 30C/W
TST TLD
Storage Temperature Range -65C to +150C 300C Lead Temperature Range (10 Seconds) Case Operating Temperature -40C to +125C MSK611 -55C to +125C MSK611B 150C Junction Temperature
Units
mA mA mA mA mV mV nA nA V/C V V V Vpp mA MHz MHz V/S dB nS nS
APPLICATION NOTES FEED FORWARD TOPOLOGY
The MSK 611 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 a composite 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
402 301 100
RF
4.02K 6.04K 5K
CF
0.25-2pF N/A N/A
Table 1
CURRENT LIMIT
Figure 2 is an active short circuit protection scheme for the MSK 611. 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 and -VCC as follows: RBASE = ((+VHV - (-VCC)) - 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. Pin 8 can be tied to ground if swing through zero is not desired.
INTERNAL COMPENSATION
Since the MSK 611 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.
HIGH VOLTAGE SUPPLIES
The positive and negative high voltage supplies on the MSK 611 can be adjusted to reduce power dissipation. The output of the MSK 611 will typically swing to within 8V of either output voltage power supply rail. Therefore, if the system in question only needs the output of the amplifier to swing 0 to 40V peak, the power supply rails could be set to -15V and +50V safely. For best performance, the minimum value of +VHV should be +50VDC. The -VSC pin may be directly connected to ground if the output does not need to swing through zero volts. The high voltage and low voltage power supplies should be decoupled as shown in Figure 1.
TRANSITION TIMES
Transition time optimization of the MSK 611 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 2 Figure 1
3 Rev. B 8/00
MECHANICAL SPECIFICATIONS
NOTE: ESD Triangle indicates Pin 1. ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED
ORDERING INFORMATION
Part Number MSK611 MSK611B 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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