Details, datasheet, quote on part number: MSK111H
PartMSK111H
CategoryAnalog & Mixed-Signal Processing => Amplifiers => Operational Amplifiers
DescriptionOperational Amplifier, Replaces WA-01 High Power High Speed Op-amp
CompanyM.S. Kennedy
DatasheetDownload MSK111H datasheet
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Features, Applications

Replaces Apex WA-01 Internal 1.5K Feedback Resistor High Output Current: 400mA Very Fast Slew Rate: 3000V/S Fast Settling Time Low Offset Voltage: 5mV Offset Null Capability

The MSK is a high speed operational amplifier which utilizes low impedance push-pull circuitry to achieve high speed amplification. Laser trimmed offset voltage provides a high DC accuracy typically less than 2mV. The MSK 111 also offers an external offset null capability for applications in which zero offset is critical. The speed and output current offered by the MSK 111 makes it an excellent choice for video processing circuits and high speed test circuits. The MSK 111 is packaged in a hermetically sealed 8 pin TO-3 package.

TYPICAL APPLICATIONS
Sample and Hold Circuits Video Processing Line Drivers Function Generators
Output +VCC NC Balance -VCC +Input -Input

VCC IOUT VIN Total Supply Voltage Output Current Differential Input Voltage Common Mode Input Voltage

Storage Temperature Range Lead Temperature Range (10 Seconds) Case Operating Temperature MSK111 MSK111H/E Junction Temperature


Parameter STATIC Supply Voltge Range Quiescent Current INPUT Input Offset Voltage Input Bias Current VO=20VPP 10V Step RL=1K TC=25C Junction to Case V mA MHz nS V/S nS C/W V mA Test Conditions 1 Group A Subgroup MSK 111H/E Min. Typ. Max. Min. MSK 111 Typ. Max. Units

Common Mode Rejection 2 Power Supply Rejection 2 OUTPUT Output Voltage Swing Output Current Power Bandwidth 2 Settling Time 2 TRANSFER CHARACTERISTICS Slew Rate Propagation Delay 2 Thermal Resistance 2

1 Unless otherwise specified, VCC=15V AV=10V/V and RL=. 2 Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only. 3 Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise specified. 4 Military grade devices ("H" suffix) shall be 100% tested to subgroups 1,2,3 and 4. 5 Subgroup 5 and 6 testing available upon request. 6 Subgroup 1,4 TA=TC=+25C Subgroup 2,5 TA=TC=+125C Subgroup 3,6 TA=TC=-55C

Both the negative and the positive supplies must be effectively decoupled with a high and low frequency bypass circuit to avoid power supply induced oscillation. An effective decoupling scheme consists a 0.01 microfarad ceramic capacitor in parallel with a 4.7 microfarad tantalum capacitor from each power supply pin to ground. All power supply decoupling capacitors should be placed as close to the package power supply pins as possible. Output, power supply, and bypass leads should be kept as short as possible. Long connections can add significant inductance, raising impedance and limiting output current slew rate. This is especially true in the video frequency range. The case of the MSK 111 is electrically isolated and should be connected to a common ground plane. In addition to the case, the input signal and input resistors should be connected to this common ground plane using a single point grounding scheme. This will help to prevent undesired current feedback that can cause instability in the circuit.

To select the correct heat sink for your application, refer to the thermal model and governing equation below.

PD x (RJC + RCS + RSA) + TA Where TJ PD RJC RCS RSA TA TS Junction Temperature Total Power Dissipation Junction to Case Thermal Resistance Case to Heat Sink Thermal Resistance Heat Sink to Ambient Thermal Resistance Case Temperature Ambient Temperature Sink Temperature

The MSK 111, unlike most operational amplifiers, has an internal feedback resistor. The value of this resistor is 1.5K. Fewer external components are required to configure the MSK 111 in either inverting or non-inverting modes. Using an internal feedback resistor shortens the feedback path, lowering summing node capacitance to ground and stabilizing high frequency characteristics. To determine the value of the input resistor for a desired gain, the following formulas must be used: Inverting - RIN=1.5K/G-1 Non Inverting - RIN=1.5K/G

In our example the amplifier application requires the output to drive a 10 volt peak sine wave across a 50 ohm load for 0.2 amp of output current. For a worst case analysis we will treat the 0.2 amp peak output current as a D.C. output current. The power supplies are 15 VDC. 1.) Find Power Dissipation PD=[(quiescent current) x (+VCC - (VCC))] + [(VS - VO) x IOUT] =(28 mA) =1.84W 2.) For conservative design, set +150C. 3.) For this example, worst case +25C. 4.) RJC 14C/W 5.) Rearrange governing equation to solve for RSA: RSA = (TJ - TA) PD - (RJC) - (RCS) = 54C/W The heat sink in this example must have a thermal resistance of no more than 54C/W to maintain a junction temperature of less than +150C. This calculation assumes a case to sink thermal resistance of 0.15C/W.

Typically,the MSK 111 has an input offset voltage of less than 2mV. The input offset voltage is laser trimmed to less than 5mV, but in applications where offset is critical, the balance pins may be used to null the offset to zero. A 20K potentiometer may be placed between pins 4 and 8 with the wiper arm connected to +VCC. If the balance function is not used pins 4 and 8 should not be connected (floating). However, if settling time is extremely important, pin 8 should be tied to the AC ground with a 100-150pF capacitor.

The safe operating area curve is a graphical representation of the power handling capability of the amplifier under various conditions. The wire bond current carrying capability, transistor junction temperature and secondary breakdown limitations are all incorporated into the safe operating area curves. All applications should be checked against the S.O.A. curves to ensure high M.T.B.F.


 

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