MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
690
HIGH VOLTAGE
AMPLIFIER
FEATURES:
Adjustable High Voltage Power Supply to +75V
Low Cost TO-3 Package
High Slew Rate - 2000V/µS Typical
Wide Bandwidth - 30MHz Typical
Low Transition Time - 20nS Typical at Full Swing
DESCRIPTION:
The MSK690 is a high voltage differential ampifier designed for use in CRT displays. With the high voltage power supply
set to +65 volts, the output voltage of the MSK690 can swing from +5 volts to +60 volts at a rate of 2000 v/µS. The MSK690
boasts a 30 MHz typical -3dB bandwidth and 20nS typical transition time making it a good candidate for high speed systems.
The circuit is packaged in a space efficient, hermetically sealed 8 pin TO-3 to achieve good thermal efficiency and low cost. No
isolation washer is necessary when heat sinking this device. The MSK690 is available in both industrial and military grades.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
High Voltage Op-Amp
CRT Display Driver
High Voltage ATE Pin Driver
Level Shifter
1
2
3
4
1
Inverting Input
-VCC
Ground
Output
8
7
6
5
Non-Inverting Input
Ground
+VHV
Case Connection
8548-156 Rev. B 10/15
ABSOLUTE MAXIMUM RATINGS
-VCC
+VHV
VIND
IOUT
RθJC
Supply Voltage
High Voltage Supply
Differential Input Voltage
Output Current
Thermal Resistance
(Output Devices)
TST
TLD
-20V
+75V
15V
100mA
Storage Temperature
Lead Temperature
(10 Seconds)
Junction Temperature
Case Operating Temperature
MSK690B
MSK690
TJ
TC
42°C/W
-65°C to +150°C
300°C
150°C
-55°C to +125°C
-40°C to +85°C
ELECTRICAL SPECIFICATIONS
Parameter
Group A
Test Conditions 1
MSK690
MSK690B
Subgroup
Min.
Typ.
-
-12
-15
-18
Max. Min.
Typ.
Max.
Units
-12
-15
-18
V
STATIC
Supply Voltage Range
-VCC
2
+VHV
-VCC=-15V
Quiescent Current
+VHV=+65V
-
+40
+65
+75
+40
+65
+75
V
1
-
20
27
-
20
27
mA
2,3
-
20
30
-
-
-
mA
1
-
40
55
-
40
55
mA
2,3
-
45
60
-
-
-
mA
1
-
±50
±195
-
±50
±250
µA
2,3
-
±100
±250
-
-
-
µA
INPUT
Input Bias Current
VIN=0V
Input Offset Current
VIN=0V
1
-
±50
±100
-
±50
±150
µA
2,3
-
±50
±200
-
-
-
µA
VOUT=+50VDC Nominal
1
-
±0.1
±0.7
-
±0.1
±0.7
V
AV=100V/V
2,3
-
±0.1
±1.0
-
-
-
V
Output Voltage (High)
RL=10KΩ
4
55
60
-
55
60
-
V
Output Voltage (Low)
RL=10KΩ
4
-
5.0
7.0
-
5.0
7.0
V
-
75
100
-
75
100
-
mA
RL=10KΩ
4
1200
2000
-
1200
2000
-
V/µS
f=1KHz
-
55
65
-
55
65
-
dB
VO=24Vpp
-
20
35
-
20
35
-
MHz
Output Offset Voltage
OUTPUT
Output Current
2
TRANSFER CHARACTERISTICS
Slew Rate
Open Loop Voltage Gain
Bandwidth (-3dB)
2
2
NOTES:
1
2
3
4
5
6
Unless otherwise specified, -VCC=-15V, +VHV=+65V, AV=10V/V.
Guaranteed by design but not tested. Typical parameters are for reference only.
Industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise requested.
Military grade devices ('B' suffix) shall be 100% tested to subgroups 1,2,3 and 4.
Subgroup 5 and 6 testing available upon request.
Subgroup 1,4 TC=+25°C
Subgroup 2,5 TC=+125°C
Subgroup 3,6 TA=-55°C
2
8548-156 Rev. B 10/15
APPLICATION NOTES
ADJUSTABLE HIGH VOLTAGE
POWER SUPPLY
CASE CONNECTION
The case of the MSK690 is internally connected to pin five of the
package. This pin can be left as a no connect but it is recommended
that the user connect this pin to ground to reduce noise and improve
overall circuit stability.
The high voltage power supply of the MSK690 can be adjusted
from +40 volts to +75 volts. To minimize device power dissipation,
the +VHV power supply should be decreased as much as possible
without causing output signal clipping. The following formula can
be used to select a value for +VHV:
DECOUPLING AND LAYOUT
+VHV = VOUTMAX + 5.0V
Since the MSK690 is a high voltage amplifier, it is commonly used
in high gain configurations. Consequently, any noise introduced
into the system through the power supplies will be amplified by the
system gain. It is therefore imperative that proper power supply
decoupling and printed circuit card layout guidelines are adhered to.
Each power supply should be effectively decoupled with a parallel
combination of capacitors as shown in the Typical Inverting Connection Diagram. These capacitors should be connected as close
as possible to the package pins and lead lengths must be kept to
a minimum. On the printed circuit card, the input and output traces
should be kept apart whenever possible to avoid localized feedback.
The power supply lines should be kept as wide as possible to keep
their effective impedance down thereby minimizing pickup.
This will ensure that the transistion times are not degraded due to
the output transistor temporarily going into saturation.
FEEDBACK CAPACITANCE
The gain range of the MSK690 is ±5V/V to ±100V/V. When
configured for low closed loop gains in the range of ±5V/V to
±25V/V, a small 0.5pF to 2.0pF adjustable capacitor should be
placed in parallel with the feedback resistor. This capacitor can be
adjusted to tailor overshoot and minimize ringing depending on
the load. For closed loop gains greater than ±25V/V the user may
omit this capacitor without any loss in circuit stability. See the table
below labeled "recommended component values" and the typical
connection diagram for component selection vs. closed loop gain.
SOURCE RESISTOR SELECTION
When driving reactive loads, such as the effective capacitance of
a cathode ray tube, local oscillations may often occur in the output
transistors of the op-amp. To minimize these oscillations, an output
source resistor may be added in series with the amplifier output and
the capacitive load as seen in the figure below. This R-C combination
acts as a snubber network that lowers the high frequency bandwidth.
The source resistor is typically in the 10 ohm to 100 ohm range. In
exchange for increased overall circuit stability, a minor reduction in
amplifier bandwidth may occur. The following formula may be used
to approximate the frequency at which the zero will occur on the
open loop plot due to the addition of the isolation resistor.
RECOMMENDED COMPONENT VALUES
AV
-RIN
Rf
+RIN
Cf
-5V/V
510Ω
2.7KΩ
499Ω
0.5-2.0pF
-10V/V
270Ω
2.7KΩ
249Ω
0.5-2.0pF
-50V/V
500Ω
25KΩ
495Ω
N/A
-100V/V
500Ω
50KΩ
499Ω
N/A
fZERO = 1/(2π(RISO + RO) CLOAD)
SOURCE RESISTOR CONNECTION
TYPICAL INVERTING CONNECTION DIAGRAM
3
8548-156 Rev. B 10/15
MECHANICAL SPECIFICATIONS
TOP VIEW PIN REFERENCES SHOWN.
WEIGHT=14.1 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
Part
Number
Screening Level
MSK690
Industrial
MSK690B
Military-Mil-PRF-38534
4
8548-156 Rev. B 10/15
REVISION HISTORY
MSK
www.anaren.com/msk
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.
5
8548-156 Rev. B 10/15