ISO 9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
NEGATIVE OUTPUT
WIDE BANDWIDTH
HIGH VOLTAGE AMPLIFIER
604
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
FEATURES:
Negative Going Output Voltage
Ultra Low Quiescent Current - ±10mA for High Voltage
95V Peak to Peak Output Voltage Swing
Slew Rate - 3000V/µS 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.
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
PIN-OUT INFORMATION
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
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
±VHV
±VIN
±VCC
θJC
Supply Voltage
Input Voltage Range
Supply Voltage (Input Stage)
Thermal Resistance
(Output Devices)
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TST
TLD
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+20,-120VDC
±VCC
±18VDC
18°C/W
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Storage Temperature Range -65°C to +150°C
Lead Temperature Range
300°C
(10 Seconds)
Case Operating Temperature
MSK604
-40°C to +85°C
MSK604B
-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
MSK 604B 4
MSK 604 3
Units
Subgroup
Min.
Typ.
Max.
Min.
Typ.
Max.
VIN=0 @ +VCC
1,2,3
-
1.5
2.0
-
1.8
2.5
mA
VIN=0 @ -VCC
1,2,3
-
15
25
-
20
30
mA
STATIC
Quiescent Current
VIN=0 @ +VHV
VIN=0 @ -VHV
Input Offset Voltage
VIN=0
Input Bias Current
Input Offset Voltage Drift
2
Power Supply Range
1
-
10
15
-
10
20
mA
2,3
-
14
17
-
-
-
mA
1
-
10
15
-
10
20
mA
2,3
-
14
17
-
-
-
mA
±5.0
-
±1.0
±10
mV
-
±2.0
-
mV
1
-
±1.0
2,3
-
±2.0 ±10.0
1
-
50
250
-
50
500
nA
2,3
-
100
350
-
100
-
nA
VIN=0
2,3
-
±10
±50
-
±10
-
µV/°C
±VCC
-
±12
±15
±18
±12
±15
±18
V
+VHV
-
0
+15
+20
0
+15
+20
V
-VHV
-
-50
-100
-120
-50
-100
-120
V
DYNAMIC CHARACTERISTICS
Output Voltage Swing
2
f=1KHz
4
-90/+5 -95/8
-
-90/+5 -95/8
-
V
Peak Output Current
2
f=1KHz
-
±100 ±250
-
±100 ±250
-
mA
VO=70V
-
MHz
Full Power Output
2
1
2
-
1
2
-
-
50
100
-
50
100
-
MHz
4
2000
3000
-
2000
3000
-
V/µS
-
94
100
-
90
100
-
dB
AV=-10V/V VO=50V
-
-
200
-
-
200
-
nS
AV=-10V/V VO=50V
-
-
1000
-
-
1000
-
nS
Unity Gain Bandwidth
VO=1.0V
Slew Rate
VO=80V
f=1KHz
Voltage Gain
2
2
Settling Time to 1%
Settling Time to 0.1%
2
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=+25°C
Subgroup 2,5
TA=TC=+125°C
Subgroup 3,6
TA=TC=-55°C
2
Rev. B 8/00
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
-RIN
RF
CF
-10V/V
1KΩ
Ω
10KΩ
Ω
0.5-5pF
-20V/V
499Ω
Ω
10KΩ
Ω
N/A
-50V/V
402Ω
Ω
Ω
20KΩ
N/A
Table 1
INTERNAL COMPENSATION
CURRENT LIMIT
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.
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:
HIGH VOLTAGE SUPPLIES
RBASE = ((+VHV - (-VHV)) - 1.2V) / 4mA
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.
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 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
Screening Level
MSK604
Industrial
MSK604B
Military-Mil-PRF-38534
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.
4
Rev. B 8/00