Page 1
ISO 9001 CERTIFIED BY DSCC
NEGATIVE OUTPUT
WIDE BANDWIDTH
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
HIGH VOLTAGE AMPLIFIER
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.
604
(315) 701-6751
EQUIVALENT SCHEMATIC
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
PIN-OUT INFORMATION
1
COMP
2
+VCC
3
GROUND
4
-VCC
5
-INPUT
6
NO CONNECTION
1
12
+VHV
11
+VSC
10
OUTPUT
9
CASE/GROUND
8
-VSC
7
-VHV
Rev. B 8/00
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ABSOLUTE MAXIMUM RATINGS
±VHV
±VIN
±VCC
θJC
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
Unity Gain Bandwidth
Slew Rate
Voltage Gain
2
2
Settling Time to 1%
Settling Time to 0.1%
2
2
2
2
2
+20,-120VDC
±VCC
○○○○○
±18VDC
18°C/W
Test Conditions
VIN=0 @ +VCC
VIN=0 @ -VCC
VIN=0 @ +VHV
VIN=0 @ -VHV
VIN=0
VIN=0
±VCC
+VHV
-VHV
f=1KHz
f=1KHz
VO=70V
VO=1.0V
VO=80V
f=1KHz
AV=-10V/V VO=50V
AV=-10V/V VO=50V
TST
Storage Temperature Range
TLD
Lead Temperature Range
(10 Seconds)
TC
Case Operating Temperature
MSK604
MSK604B
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
-
-
-
○○○○○○○○○○○○
○○○○○○○○○○○
MSK 604B MSK 604
Min.
Typ.
-
1.5
-
15
-
10
-
14
-
10
-
14
-
±1.0
-
±2.0
-
50
-
100
-
±10
±12
±15
0
+15
-50
-100
-90/+5
±100
1
50
2000
94
-
-
-95/8
±250
2
100
3000
100
200
1000
-65°C to +150°C
○○○○○○○○○○
-40°C to +85°C
-55°C to +125°C
○○○○○○○○○○○○
4
Max.
2.0
±5.0
±10.0
250
350
±50
±18
+20
-120
25
15
17
15
17
-
-
-
-
-
-
-
-
Min.
-
-
-
-
-
-
-
-
-
-
-
±12
0
-50
-90/+5
±100
1
50
2000
90
-
-
Typ.
±1.0
±2.0
±10
±15
+15
-100
-95/8
±250
3000
1000
1.8
20
10
-
10
-
50
100
2
100
100
200
3
Max.
2.5
30
20
-
20
-
±10
-
500
-
-
±18
+20
-120
-
-
-
-
-
-
-
-
300°C
150°C
Units
mA
mA
mA
mA
mA
mA
mV
mV
nA
nA
µV/°C
V
V
V
V
mA
MHz
MHz
V/µS
dB
nS
nS
NOTES:
1
Unless otherwise specified, ±VCC=±15VDC, +VHV=+15VDC, -VHV=-100V CL=8pF (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 TA=TC=+25°C
Subgroup 2,5 TA=TC=+125°C
Subgroup 3,6 TA=TC=-55°C
2
Rev. B 8/00
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APPLICATION NOTES
FEED FORWARD TOPOLOGY
The MSK 604 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 it's A.C. and D.C. components. The
D.C. component is allowed to run through the differential am-
plifier 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 604 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
1K
499
402
Ω
ΩΩ
ΩΩ
Ω
ΩΩ
ΩΩ
Ω
ΩΩ
10K
10K
20K
ΩΩ
Ω
ΩΩ
ΩΩ
Ω
ΩΩ
ΩΩ
Ω
ΩΩ
0.5-5pF
N/A
N/A
-10V/V
-20V/V
-50V/V
Table 1
CURRENT LIMIT
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 fol-
lows:
HIGH VOLTAGE SUPPLIES
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 mini-
mum 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.
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 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.
RBASE = ((+VHV - (-VHV)) - 1.2V) / 4mA
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 = (R
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.
SC) (CSC)
Figure 1
Figure 2
Rev. B 8/003
Page 4
Page 5
Page 6
MECHANICAL SPECIFICATIONS
MSK604
NOTE: ESD Triangle indicates Pin 1.
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED
Number
MSK604
MSK604B
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.
Rev. B 8/004
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