MIL-PRF-38534 CERTIFIED
612
FAST SETTLING
HIGH VOLTAGE AMPLIFIER
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
FEATURES:
Ultra Low Quiescent Current - ±13mA for High Voltage
140V Peak to Peak Output Voltage Swing
Slew Rate - 5000V/µS Typical
Settling Time to 0.05% - 1.5µS Max.
Input Offset Voltage Only - ±5mV Max.
Output Current - 250mA Peak
Adjustable VHV Power Supply Minimizes Power Dissipation
Compact Package Offers Superior Power Dissipation Capability
Contact MSK for MIL-PRF-38534 Qualification Status
DESCRIPTION:
The MSK 612 is a high voltage fast settling amplifier designed to provide large voltage swings at high slew rates
in wideband systems. The true inverting op-amp topology employed in the MSK 612 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 612
achieves impressive settling time 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 612 stable in this range. The MSK 612 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
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
Fast Settling 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
COMP
+VCC
GROUND
-VCC
-INPUT
NO CONNECTION
12
11
10
9
8
7
+VHV
+VSC
OUTPUT
CASE/GROUND
-VSC
-VHV
Rev. B 3/06
6
ABSOLUTE MAXIMUM RATINGS
±VHV
±VIN
±VCC
θJC
Supply Voltage
Input Voltage Range
Supply Voltage (Input Stage)
Thermal Resistance
(Output Devices)
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±80VDC
±VCC
±18VDC
30°C/W
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TST
TLD
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Storage Temperature Range -65°C to +150°C
Lead Temperature Range
300°C
(10 Seconds)
Case Operating Temperature
MSK612
-40°C to +85°C
MSK612B/E
-55°C to +125°C
Junction Temperature
150°C
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TC
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TJ
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ELECTRICAL SPECIFICATIONS
Parameter
Group A
Test Conditions 1
MSK 612B/E
MSK 612
Units
Subgroup
Min.
Typ.
Max.
Min.
Typ.
Max.
VIN=0 @ +VCC
1,2,3
-
1.0
3.5
-
1.0
4.0
mA
VIN=0 @ -VCC
1,2,3
-
12
30
-
15
32
mA
VIN=0 @ +VHV
1,2,3
-
12
20
-
12
22
mA
VIN=0 @ -VHV
1,2,3
-
12
20
-
12
22
mA
STATIC
Quiescent Current
Input Offset Voltage
VIN=0
Input Bias Current
Input Offset Voltage Drift 2
Power Supply Range 2
1
-
±0.2
±5.0
-
±1.0
±10
mV
2,3
-
±1.0
±10
-
±2.0
-
mV
1
-
50
500
-
50
750
nA
2,3
-
100
750
-
100
-
nA
VIN=0
2,3
-
±5
±50
-
±5
-
µV/°C
±VCC
-
±12
±15
±18
±12
±15
±18
V
±VHV
-
±50
±65
±80
±50
±65
±80
V
f=1KHz
4
±50
±58
-
±50
±58
-
V
-
±200 ±250
-
mA
DYNAMIC CHARACTERISTICS
Output Voltage Swing
Peak Output Current 2
±200 ±250
f=1KHz
-
Full Power Output 2
V0=±50V
-
5
12
-
4
12
-
MHz
Unity Gain Bandwidth 2
V0=±1.0V
-
80
100
-
80
100
-
MHz
Slew Rate
V0=±50V
4
-
2000
5000
-
V/µS
VO=±50V f=1KHz
4
90
100
-
90
100
-
dB
Settling Time to 1% 2
AV=-10V/V VO=±50V
-
-
100
-
-
100
-
nS
Settling Time to 0.1% 2
AV=-10V/V VO=±50V
-
-
400
-
-
400
-
nS
Settling Time to 0.05%
AV=-10V/V VO=±50V
4
-
750
1.5
-
750
1.6
µS
Voltage Gain 2
2000 5000
NOTES:
1
2
3
4
5
Unless otherwise specified, ±VCC=±15VDC, ±VHV=±65VDC, 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 and "E" suffix 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=+25°C
Subgroup 2,5
TA=TC=+125°C
Subgroup 3,6
TA=TC=-55°C
6 Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
2
Rev. B
3/06
APPLICATION NOTES
FEED FORWARD TOPOLOGY
The MSK 612 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.
VOLTAGE
GAIN
-RIN
RF
CF
-10V/V
1KΩ
Ω
10KΩ
Ω
0.5-5pF
-20V/V
249Ω
Ω
5KΩ
Ω
N/A
-50V/V
100Ω
Ω
Ω
5KΩ
N/A
Table 1
INTERNAL COMPENSATION
CURRENT LIMIT
Since the MSK 612 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 1.0uF ceramic capacitor to +VHV for all applications.
Figure 2 is a possible active short circuit protection scheme
for the MSK 612. 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:
HIGH VOLTAGE SUPPLIES
RBASE = ((+VHV - (-VHV)) - 1.2V) / 4mA
The positive and negative high voltage supplies on the MSK
612 can be adjusted to reduce power dissipation. The output
of the MSK 612 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 safely. 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 80V. The
high voltage and low voltage power supplies should be decoupled
as shown in Figure 1.
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.
TRANSITION TIMES
Transition time optimization of the MSK 612 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
3/06
MECHANICAL SPECIFICATIONS
WEIGHT=21 GRAMS TYP.
NOTE: ESD Triangle indicates Pin 1.
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED
ORDERING INFORMATION
Part
Number
Screening Level
MSK612
Industrial
MSK612E
Extended Reliability
MSK612B
Mil-PRF-38534 Class H
M.S. Kennedy Corp.
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.
Please visit our website for the most recent revision of this datasheet.
Contact MSK for MIL-PRF-38534 qualification status.
4
Rev. B
3/06