ISO 9001 CERTIFIED BY DSCC M.S.KENNEDY CORP. 1461 HIGH SPEED/VOLTAGE OP AMP 4707 Dey Road Liverpool, N.Y. 13088 (315) 701-6751 MIL-PRF-38534 CERTIFIED FEATURES: Extremely Fast - 500v/µS 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 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/µS 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 PIN-OUT INFORMATION 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 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 ±VCC IOUT VIN RTH Supply Voltage Output Current Differential Input Voltage Thermal Resistance Junction to Case (Output Devices Only) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ TST Storage Temperature Range TLD Lead Temperature Range (10 Seconds) TC Case Operating Temperature (MSK 1461B) (MSK 1461) TJ Junction Temperature ±45V 800mA ±25V 12°C/W ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ -65°C to +150°C 300°C ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ -55°C to +125°C -40°C to 85°C +175°C ○ ○ ○ ○ ○ ○ ○ ○ ELECTRICAL SPECIFICATIONS MSK 1461B MSK 1461 Group A Subgroup Min. Typ. Max. Min. Typ. Max. - ±15 - ±45 ±15 - ±45 V 1 - ±19 ±25 - ±19 ±28 mA 2,3 - ±21 ±35 - - - mA Junction to Case - - 11 12 - 11 15 °C/W VIN=0V AV=-10V/V 1 - ±1.0 ±5.0 - ±1.0 ±8.0 Bal. Pins=N/C 2,3 - ±6.0 ±50 - ±10 - RPOT=10KΩ to +VCC - - ±8.0 - - ±8.0 - VCM=0V 1 - ±10 ±300 - ±10 ±300 Either Input 2,3 - ±10 ±100 - - - nA - - ±5.0 - - ±5.0 - pA - - ±5.0 - - - - - 3x10 12 - - - ±22 ±24 - F=10KHz VCM=±22V 4 90 100 RL=50Ω AV=-5V/V 4 ±27 RL=1KΩ 4 ±30 RL=33Ω AV=-5V/V TJ<175°C 4 ±600 ±800 0.1% 10V step 4 - 400 800 - VOUT=±10V RL=1KΩ AV=-5V/V 4 200 500 - Open Loop Voltage Gain 3 RL=1KΩ F=100Hz 4 90 106 Gain Bandwidth Product 3 F=100KHz 4 800 1200 Test Conditions Parameter Units STATIC Supply Voltage Range 3 Quiescent Current Thermal Resistance VIN=0V 3 INPUT Input Offset Voltage Input Offset Voltage Drift Input Offset Adjust 3 Input Bias Current Input Offset Current 3 VCM=0V Input Impedance 3 F=DC Common Mode Range 3 Common Mode Rejection Ratio 3 mV µV/°C V pA - nA 3x10 12 - Ω ±22 ±24 - V - 90 100 - dB ±31 - ±27 ±31 - V ±33 - ±30 ±33 - V - ±600 ±800 - mA 400 800 nS 200 500 - V/µS - 90 106 - dB - 800 1200 - MHz OUTPUT Output Voltage Swing Output Current, Peak Settling Time 2 3 TRANSFER CHARACTERISTICS Slew Rate NOTES: 1 2 3 4 5 6 7 RSC=0Ω 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=+25°C Subgroup 2,5 TJ=+125°C Subgroup 3,6 TA=-55°C 2 Rev. B 8/00 APPLICATION NOTES HEAT SINKING To select the correct heat sink for your application, refer to the thermal model and governing equation below. Thermal Model: CURRENT LIMIT The output current of the MSK 1461 is internally limited to approximately ±750mA by two 0.8Ω 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) - 0.8Ω] Since the 0.65V term is obtained from the base to emitter voltage drop of a bipolar transistor, the equation only holds true for +25°C operation. As case temperature increases, the 0.65V term will decrease making the actual current limit set point decrease slightly. Governing Equation: The following schematic illustrates how to connect each current limit resistor: TJ=PD x (RθJC + RθCS + RθSA) + TA Where TJ = Junction Temperature PD = Total Power Dissipation RθJC = Junction to Case Thermal Resistance RθCS = Case to Heat Sink Thermal Resistance RθSA = Heat Sink to Ambient Thermal Resistance TC = Case Temperature TA = Ambient Temperature TS = Sink Temperature Example: In our example the amplifier application requires the output to drive a 20 volt peak sine wave across a 400Ω 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. INPUT OFFSET ADJUST CONNECTION IN POWER SUPPLY BYPASSING 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 0.1µF ceramic capacitor in parallel with a 4.7µF tantalum capacitor from each power supply pin to ground. SAFE OPERATING AREA 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 150°C 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 2.85°C/W to maintain a juncture calculations. tion temperature of no more than +125°C. Rev. B 8/00 3 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=+125°C. 3.) For this example, worst case TA=+50°C 4.) RθJC = 12°C/W from MSK 1461B Data Sheet 5.) RθCS = 0.15°C/W for most thermal greases 6.) Rearrange governing equation to solve for RθSA RθSA = ((TJ - TA)/PD) - (RθJC) - (RθCS) = ((125°C - 50°C) / 5W) - (12°C/W) - (.15°C/W) ≅ 2.85°C/W 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 Screening Level MSK1461 Industrial MSK1461B Military-Mil-PRF-38534 M.S. Kennedy Corp. 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. 5 Rev. B 8/00