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ISO 9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
HIGH SPEED/VOLTAGE OP AMP
1461
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
FEATURES:
Extremely Fast - 500v/S Wide Supply Range 15V to 45V VMOS Output, No S.O.A. Restrictions Large Gain-Bandwidth Product FET Input Electrically Isolated Case 800mA Typical Output Current
MIL-PRF-38534 CERTIFIED
DESCRIPTION:
The MSK 1461 is a state of the art high speed FET input operational amplifier. The distinguishing characteristic of the MSK 1461 is its unique VMOS output stage which completely eliminates the safe operating area restrictions associated with secondary breakdown of bipolar transistor output stage op-amps. Freedom from secondary breakdown allows the 1461 to handle large output currents at any voltage level limited only by transistor junction temperature. 115 dB of open loop gain gives the 1461 high closed loop gain accuracy and the typical 1.0mV of input offset voltage will fit well in any error budget. A 500 V/S slew rate and 1200 MHz gain bandwidth product make the 1461 an outstanding high-speed op-amp. A single external capacitor is used for compensation and output current limiting is user programmable through the selection of two external resistors.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
Video Yoke Drivers Video Distribution Amplifiers High Accuracy Audio Amplification High Speed ATE Pin Drivers 1 2 3 4 5 6 7
1
PIN-OUT INFORMATION
Inverting Input Non-Inverting Input No Connection No Connection Negative Power Supply Negative Current Limit No Connection 8 9 10 11 12 13 14 Output Positive Current Limit Positive Power Supply Compensation Compensation Offset Adjust Offset Adjust
Rev. B 8/00
ABSOLUTE MAXIMUM RATINGS

-55C to +125C -40C to 85C +175C

ELECTRICAL SPECIFICATIONS
Parameter STATIC Supply Voltage Range 3 Quiescent Current Thermal Resistance INPUT Input Offset Voltage Input Offset Voltage Drift Input Offset Adjust 3 Input Bias Current Input Offset Current 3 Input Impedance 3 Common Mode Range 3 Common Mode Rejection Ratio 3 OUTPUT Output Voltage Swing Output Current, Peak Settling Time 2 3 TRANSFER CHARACTERISTICS Slew Rate Open Loop Voltage Gain 3 Gain Bandwidth Product 3 VOUT=10V RL=1K AV=-5V/V RL=1K F=100Hz F=100KHz 4 4 4 200 90 800 500 106 1200 200 90 800 500 106 1200 V/S dB MHz RL=50 AV=-5V/V RL=1K RL=33 AV=-5V/V TJ<175C 0.1% 10V step 4 4 4 4 27 30 31 33 400 800 27 30 31 33 400 800 V V mA nS F=10KHz VCM=22V VIN=0V AV=-10V/V Bal. Pins=N/C RPOT=10K to +VCC VCM=0V Either Input VCM=0V F=DC 1 2,3 1 2,3 4 22 90 1.0 5.0 6.0 8.0 50 22 90 1.0 8.0 10 8.0 5.0 3x10 12 24 100 mV V/C V pA nA pA nA V dB
3
Test Conditions
Group A Subgroup
MSK 1461B Min. 15 Typ. 19 21 11 Max. 45 25 35 12
MSK 1461 Min. 15 Typ. 19 11 Max. 45 28 15
VIN=0V Junction to Case 1 2,3 -
10 300 10 100 5.0 5.0 3x10 12 24 100 -
10 300
600 800
600 800
NOTES:
1 2 3 4 5 6 7 RSC=0 and VCC=36VDC unless otherwise specified. AV=-1, measured in false summing junction circuit. Devices shall be capable of meeting the parameter, but need not be tested. Typical parameters 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. Subgroups 5 and 6 testing available upon request. Subgroup 1,4 TC=+25C Subgroup 2,5 TJ=+125C Subgroup 3,6 TA=-55C
2
Rev. B 8/00

VCC IOUT VIN RTH
Supply Voltage Output Current Differential Input Voltage Thermal Resistance Junction to Case (Output Devices Only)
45V 800mA 25V 12C/W
TST Storage Temperature Range TLD Lead Temperature Range (10 Seconds) TC Case Operating Temperature (MSK 1461B) (MSK 1461) TJ Junction Temperature
-65C to +150C 300C
Units
V mA mA C/W
APPLICATION NOTES HEAT SINKING
To select the correct heat sink for your application, refer to the thermal model and governing equation below. The output current of the MSK 1461 is internally limited to approximately 750mA by two 0.8 internal current limit resistors. Additional current limit can be achieved through the use of two external current limit resistors. One resistor (+RSC) limits the positive output current and the other (-RSC) limits the negative output current. The value of the current limit resistors can be determined as follows: RSC = [(0.65V/ILIM) - 0.8] Since the 0.65V term is obtained from the base to emitter voltage drop of a bipolar transistor, the equation only holds true for +25C operation. As case temperature increases, the 0.65V term will decrease making the actual current limit set point decrease slightly.
CURRENT LIMIT
Thermal Model:
Governing Equation:
TJ=PD x (RJC + RCS + RSA) + TA Where TJ = Junction Temperature PD = Total Power Dissipation RJC = Junction to Case Thermal Resistance RCS = Case to Heat Sink Thermal Resistance RSA = Heat Sink to Ambient Thermal Resistance TC = Case Temperature TA = Ambient Temperature TS = Sink Temperature
The following schematic illustrates how to connect each current limit resistor:
INPUT OFFSET ADJUST CONNECTION
IN
Both the negative and the positive power supplies must be effectively decoupled with a high and low frequency bypass circuit to avoid power supply induced oscillation. An effective decoupling scheme consists of a 0.1F ceramic capacitor in parallel with a 4.7F tantalum capacitor from each power supply pin to ground.
Example:
In our example the amplifier application requires the output to drive a 20 volt peak sine wave across a 400 load for 50mA of peak output current. For a worst case analysis we will treat the 50mA peak output current as a D.C. output current. The power supplies shall be set to 40VDC.
POWER SUPPLY BYPASSING
1.) Find Driver Power Dissipation PD = [(quiescent current) x (+VS - (-VS))] + [(+VS-VO) x IOUT] = [(50mA) x (80V)] + [(20V) x (0.05A)] = 4W + 1.0W = 5Watts 2.) For conservative design, set TJ=+125C. 3.) For this example, worst case TA=+50C 4.) RJC = 12C/W from MSK 1461B Data Sheet 5.) RCS = 0.15C/W for most thermal greases 6.) Rearrange governing equation to solve for RSA RSA = ((TJ - TA)/PD) - (RJC) - (RCS) = ((125C - 50C) / 5W) - (12C/W) - (.15C/W) 2.85C/W
Any designer who has worked with power operational amplifiers is familiar with Safe Operating Area (S.O.A.) curves. S.O.A. curves are a graphical representation of the following three power limiting factors of any bipolar transistor output op-amp. 1. Wire Bond Current Carrying Capability 2. Transistor Junction Temperature 3. Secondary Breakdown Limitations Since the MSK 1461 utilizes a MOSFET output, there are no secondary breakdown limitations and therefore no need for S.O.A. curves. The only limitation on output power is the junction temperature of the output drive transistors. Whenever possible, junction temperature should be kept below 150C to ensure high reliability. See "Heat The heat sink in this example must have a thermal Sinking" for more information involving junction temperaresistance of no more than 2.85C/W to maintain a juncture calculations. tion temperature of no more than +125C. Rev. B 8/00 3
SAFE OPERATING AREA
TYPICAL PERFORMANCE CURVES
4
Rev. B 8/00
MECHANICAL SPECIFICATIONS
ESD Triangle Indicates Pin 1. NOTE: ALL DIMENSIONS ARE 0.010 UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
Part Number MSK1461 MSK1461B Screening Level Industrial Military-Mil-PRF-38534
4707 Dey Road, Liverpool, New York 13088 Phone (315) 701-6751 FAX (315) 701-6752 www.mskenndy.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.
5
Rev. B 8/00

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