MSK690 MSK | Alldatasheet
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4707 Dey Road Liverpool, N.Y. 13088 (315) 701-6751 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 MIL-PRF-38534 CERTIFIED 690 ISO-9001 CERTIFIED BY DSCC High Voltage Op-Amp CRT Display Driver High Voltage ATE Pin Driver Level Shifter Inverting Input -VCC Ground Output Non-Inverting Input Ground +VHV Case Connection M.S.KENNEDY CORP. HIGH VOLTAGE AMPLIFIER PIN-OUT INFORMATION TYPICAL APPLICATIONS EQUIVALENT SCHEMATIC 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/µS. 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. Rev. A 8/00
-VCC +VHV VOUT=+50VDC Nominal AV=100V/V RL=10KΩ RL=10KΩ RL=10KΩ f=1KHz VO=24Vpp Group A Subgroup 2,3 2,3 2,3 2,3 2,3 Output Offset Voltage Input Offset Current Input Bias Current Supply Voltage Range Storage Temperature Lead Temperature (10 Seconds) Case Operating Temperature (MSK690B) (MSK690) Junction Temperature Supply Voltage High Voltage Supply Differential Input Voltage Output Current Thermal Resistance (Output Devices) -65°C to +150°C 300°C -55°C to +125°C -40°C to +85°C 150°C -20V +75V 15V 100mA 42°C/W ABSOLUTE MAXIMUM RATINGS TST TLD TC TJ -VCC +VHV VIND IOUT RθJC 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 NOTES: STATIC INPUT OUTPUT Output Voltage (High) Output Voltage (Low) Output Current TRANSFER CHARACTERISTICS Slew Rate Open Loop Voltage Gain Bandwidth (-3dB) Typ. -15 +65 ±50 ±100 ±50 ±50 ±0.1 ±0.1 5.0 100 2000 Min. -12 +40 1200 Max. -18 +75 ±250 ±150 ±0.7 7.0 Typ. -15 +65 ±50 ±50 ±0.1 5.0 100 2000 MSK690B MSK690 Parameter Max. -18 +75 ±195 ±250 ±100 ±200 ±0.7 ±1.0 7.0 Test Conditions ELECTRICAL SPECIFICATIONS Min. -12 +40 1200 Units V V mA mA mA mA µA µA µA µA V V V V mA V/µS dB MHz Quiescent Current -VCC=-15V VIN=0V +VHV=+65V VIN=0V Rev. A 8/00
ADJUSTABLE HIGH VOLTAGE POWER SUPPLY The high voltage power supply of the MSK 690 can be ad- justed 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. 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 de- pending 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 compo- nent values" and the typical connection diagram for compo- nent selection vs. closed loop gain. CASE CONNECTION 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 re- duce noise and improve overall circuit stability. DECOUPLING AND LAYOUT Since the MSK 690 is a high voltage amplifier, it is com- monly 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 pack- age 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. SOURCE RESISTOR SELECTION When driving reactive loads, such as the effective capaci- tance 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/(2π(RISO + RO) CLOAD) TYPICAL INVERTING CONNECTION DIAGRAM AV -5V/V -10V/V -50V/V -100V/V Rf 2.7KΩ 2.7KΩ 25KΩ 50KΩ Cf 0.5-2.0pF 0.5-2.0pF N/A N/A -RIN 510Ω 270Ω 500Ω 500Ω RECOMMENDED COMPONENT VALUES +RIN 499Ω 249Ω 495Ω 499Ω SOURCE RESISTOR CONNECTION Rev. A 8/00
Rev. A 8/00 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.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751 FAX (315) 701-6752 www.mskennedy.com
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ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.