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ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
HIGH VOLTAGE AMPLIFIER
690
(315) 701-6751
FEATURES:
Adjustable High Voltage Power Supply to +75V Low Cost TO-3 Package High Slew Rate - 2000V/S Typical Wide Bandwidth - 30MHz Typical Low Transition Time - 20nS Typical at Full Swing
MIL-PRF-38534 CERTIFIED
DESCRIPTION:
The MSK 690 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 MSK 690 can swing from +5 volts to +60 volts at a rate of 2000 v/S. The MSK 690 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 MSK 690 is available in both industrial and military grades.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
High Voltage Op-Amp CRT Display Driver High Voltage ATE Pin Driver Level Shifter 1 2 3 4
PIN-OUT INFORMATION
Inverting Input -VCC Ground Output
1
8 7 6 5
Non-Inverting Input Ground +VHV Case Connection
Rev. A 8/00
ABSOLUTE MAXIMUM RATINGS

ELECTRICAL SPECIFICATIONS
Parameter STATIC Supply Voltage Range
2
Test Conditions 1
Group A Subgroup 1 2,3 1 2,3 1 2,3 1 2,3 1 2,3 4 4 Min. -12 +40 55 75 1200 55 20
MSK690B Typ. -15 +65 20 20 40 45 50 100 50 50 0.1 0.1 60 5.0 100 2000 65 35 Max. -18 +75 27 30 55 60 195 250 100 200 0.7 1.0 7.0 Min. -12 +40 55 75 1200 55 20
MSK690 Typ. -15 +65 20 40 50 50 0.1 60 5.0 100 2000 65 35 Max. -18 +75 27 55 250 150 0.7 7.0 Units V V mA mA mA mA A A A A V V V V mA V/S dB MHz
-VCC +VHV -VCC=-15V
Quiescent Current +VHV=+65V INPUT Input Bias Current VIN=0V
Input Offset Current Output Offset Voltage OUTPUT Output Voltage (High) Output Voltage (Low) Output Current Slew Rate Open Loop Voltage Gain 2 Bandwidth (-3dB)
2 2
VIN=0V VOUT=+50VDC Nominal AV=100V/V RL=10K RL=10K
TRANSFER CHARACTERISTICS RL=10K f=1KHz VO=24Vpp 4 -
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=+25C Subgroup 2,5 TC=+125C Subgroup 3,6 TA=-55C
2
Rev. A 8/00

42C/W
-55C to +125C -40C to +85C 150C

-VCC +VHV VIND IOUT RJC
Supply Voltage High Voltage Supply Differential Input Voltage Output Current Thermal Resistance (Output Devices)
-20V +75V 15V 100mA
TST Storage Temperature TLD Lead Temperature (10 Seconds) TC Case Operating Temperature (MSK690B) (MSK690) TJ Junction Temperature
-65C to +150C 300C
APPLICATION NOTES ADJUSTABLE HIGH VOLTAGE POWER SUPPLY CASE CONNECTION
The high voltage power supply of the MSK 690 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: +VHV = VOUTMAX + 5.0V This will ensure that the transistion times are not degraded due to the output transistor temporarily going into saturation. The case of the MSK 690 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.
DECOUPLING AND LAYOUT
Since the MSK 690 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.
FEEDBACK CAPACITANCE
The gain range of the MSK 690 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.
RECOMMENDED COMPONENT VALUES AV -5V/V -10V/V -50V/V -100V/V -RIN 510 270 500 500 Rf 2.7K 2.7K 25K 50K +RIN 499 249 495 499 Cf 0.5-2.0pF 0.5-2.0pF N/A N/A
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. fZERO = 1/(2(RISO + RO) CLOAD)
TYPICAL INVERTING CONNECTION DIAGRAM 3
SOURCE RESISTOR CONNECTION Rev. A 8/00
MECHANICAL SPECIFICATIONS
ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
Part Number MSK690 MSK690B Screening Level Industrial Military-Mil-PRF-38534
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.
M.S. Kennedy Corp.
4
Rev. A 8/00

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