Page 1
ISO 9001 CERTIFIED BY DSCC
ULTRA HIGH SLEW RATE
HIGH VOLTAGE AMPLIFIER
611
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
FEATURES:
Low Quiescent Current - ±25mA for High Voltage Stage
110V Peak to Peak Output Voltage Swing
Slew Rate - 6000V/µS 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
(315) 701-6751
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
PIN-OUT INFORMATION
1
COMP
2
+VCC
3
GROUND
4
N/C
5
-INPUT
6
N/C
12
+VHV
11
+VSC
10
OUTPUT
9
CASE/GROUND
8
-VSC
7
-VCC
Rev. B 8/001
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ABSOLUTE MAXIMUM RATINGS
+VHV,+VSC
-VSC
±VIN
±VCC
θJC
Supply Voltage
Supply Voltage
○○○○○○○○○○○○
○○○○○○○○○○○○
Input Voltage Range
Supply Voltage (Input Stage)
Thermal Resistance
(Output Devices)
ELECTRICAL SPECIFICATIONS
Parameter
STATIC
Quiescent Current
Input Offset Voltage
Input Bias Current
Input Offset Voltage Drift
Power Supply Range
DYNAMIC CHARACTERISTICS
Output Voltage Swing
Peak Output Current
Full Power Output Frequency
Unity Gain Bandwidth
Slew Rate
Voltage Gain
2
Settling Time to 1%
Settling Time to 0.1%
2
2
6
2
2
2
2
2
+130VDC
-18VDC
○○○○○○○○○○○
±18VDC
○○○○
○○○○○○○○○○
Test Conditions
VIN=0
VIN=0
VIN=0
±VCC
+VHV, +VSC
-VSC
f=1KHz
f=1KHz
V0=100Vpp
V0=1Vpp
V0=100Vpp
f=1KHz
AV=-10V/V VO=50Vpp
AV=-10V/V VO=50Vpp
30°C/W
±VCC
1
@ +VCC
@ -VCC
@ +VHV
7
@ -VSC
TST
Storage Temperature Range
TLD
Lead Temperature Range
(10 Seconds)
TC
Case Operating Temperature
MSK611
MSK611B
TJ
Junction Temperature
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
4
-
-
○○○○○○○○○○○○
○○○○○○○○○○○
MSK 611B MSK 611
50
-18
5
80
Typ.
1.0
-
30
-
25
-
11
-
±1.0
-
±2.0
-
50
-
100
-
±10
-
±15
120
-15
110
±150
7
150
-
6000
100
100
-
250
-
Min.
±12
100
±125
5500
-65°C to +150°C
○○○○○○○○○○
-40°C to +125°C
-55°C to +125°C
○○○○○○○○○○○○
Max.
2.0
40
40
15
±5.0
±10.0
250
500
±50
±18
130
0
-
-
-
-
-
-
-
-
Min.
±12
100
±125
5500
50
-18
4
80
Typ.
-
1.0
-
-
-
-
±1.0
-
±2.0
-
-
100
-
±10
±15
120
-15
110
±150
-
150
6000
100
-
100
-
250
30
25
11
50
300°C
150°C
2.0
45
45
20
-
500
-
-
130
0
-
-
-
-
-
-
-
-
Units
mA
mA
mA
mA
mV
mV
nA
nA
µV/°C
V
V
V
Vpp
mA
MHz
MHz
V/µS
dB
nS
nS
Max.
±10
±18
7
NOTES:
1
Unless otherwise specified, ±VCC=±15VDC, +VHV=+VSC=+120VDC, -VSC=-15VDC, CL=5pF (probe capacitance) and AV=10V/V.
2
This parameter is guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
3
Industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise specified.
4
Military grade devices ('B' suffix) shall be 100% tested to subgroups 1,2,3 and 4.
5
Subgroup 1,4 TC=+25°C
Subgroup 2,5 TJ=+125°C
Subgroup 3,6 TA=-55°C
6
The output voltage swing is typically within 8 volts of each VSC supply setting.
7
Includes +VSC quiescent current.
Rev. B 8/002
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APPLICATION NOTES
FEED FORWARD TOPOLOGY
The MSK 611 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 a composite amplifier with most
of the benefits of a differential amplifier without the loss in
system bandwidth.
INTERNAL COMPENSATION
Since the MSK 611 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 0.1uF ceramic capacitor to +VHV for all appli-
cations.
VOLTAGE
-RIN
R
F
CF
GAIN
ΩΩ
402
301
100
Ω
ΩΩ
ΩΩ
Ω
ΩΩ
ΩΩ
Ω
ΩΩ
4.02K
6.04K
5K
ΩΩ
Ω
ΩΩ
ΩΩ
Ω
ΩΩ
ΩΩ
Ω
ΩΩ
0.25-2pF
N/A
N/A
-10V/V
-20V/V
-50V/V
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 cur-
rent 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
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 con-
nected 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 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.
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 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.
Figure 1
Figure 2
3
Rev. B 8/00
Page 4
MECHANICAL SPECIFICATIONS
NOTE: ESD Triangle indicates Pin 1.
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED
Number
MSK611
MSK611B
4707 Dey Road, Liverpool, New York 13088
ORDERING INFORMATION
Part
Screening Level
Industrial
Military-Mil-PRF-38534
M.S. Kennedy Corp.
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.
4
Rev. B 8/00
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