Details, datasheet, quote on part number: MSK032B
PartMSK032B
CategoryAnalog & Mixed-Signal Processing => Amplifiers => Operational Amplifiers
DescriptionOperational Amplifier, Fet input Differential Op-amp
CompanyM.S. Kennedy
DatasheetDownload MSK032B datasheet
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Features, Applications

4707 Dey Road Liverpool, N.Y. 13088 Fast Slew Rate Fast Settling Time FET Input Wide Bandwidth Electrically Isolated LH0032 Pin Compatible Upgrade

The MSK is a high speed, FET input, differential operational amplifier. Intended to replace the popular LH0032, the MSK 032 offers improved performance, much greater consistency from lot to lot, and improved stability over its operating temperature range. The MSK 032's wide bandwidth, accuracy and output drive capability make it a superior choice for applications such as video amplifiers, buffer amplifiers, comparator circuits and other high frequency signal transfer circuits. As with all MSK products, the MSK 032 is conservatively specified and is available in military and industrial grades.

TYPICAL APPLICATIONS
Video Amplifiers Buffer Amplifiers Comparator Circuits
NC Output Compensation Compensation/Balance Inverting Input Non-Inverting Input
NC Case Connection NC Negative Power Supply Output Positive Power Supply

VCC IOUT VIN TC RTH 18V Supply Voltage 40mA Output Current 30V Differential Input Voltage Case Operating Temperature Range to +125C (MSK to +85C (MSK 032) 187C/W Thermal Resistance

Storage Temperature Range Lead Temperature Range (10 Seconds) Junction Temperature

Parameter STATIC Supply Voltage Range 2 7 Quiescent Current INPUT Input Offset Voltage Input Offset Voltage Drift Input Offset Adjust Input Bias Current Input Offset Current Input Impedance 2 Power Supply Rejection Ratio 2 Common Mode Rejection Ratio 2 Input Noise Voltage Equivalent Input Noise OUTPUT Output Voltage Swing Output Current Settling Time 1% 1 Settling Time 0.1% 2 Full Power Bandwidth (Small Signal) 2 TRANSFER CHARACTERISTICS Slew Rate Limit Open Loop Voltage Gain RL=1K 4

Bal.Pins=NC VIN=0V AV=-10V/V Bal.Pins=NC RPOT=10K To +VCC VCM=0V Either Input VCM=0V F=DC VCC=5V F=DC RL=1K 10V step RL=1K 10V step Vo=10V RL=510

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 and "E" suffix 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. Subgroup 5 and 6 testing available upon request. Subgroup 1,4 TA=TC=+25C Subgroup 2,5 TA=TC=+125C Subgroup TA=TC=-55C 7 Electrical specifications are derated for power supply voltages other than 15VDC.

To determine if a heat sink is necessary for your application and if so, what type, refer to the thermal model and governing equation below.

RSA= ((TJ - TA)/PD ) - (RJC) - (RCS). - 187 C/W 0.15C/W 5.2C/W The heat sink in this example must have a thermal resistance of no more than 5.2C/W to maintain a junction temperature of no more than+125C.

= 2VpF: Slew rate is based upon the sinusoidal linear response of the amplifier and is calculated from the full power bandwidth frequency.

SLEW RATE LIMIT dv/dt: The slew rate limit is based upon the amplifier's response to a step input and is measured between 10% and 90%. MSK measures TR orTF, whichever is greater at10VouT, RL=510 SRL= or TF

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 MSK 032, can be frequency compensated by connecting an R-C snubber circuit from pin 3 to pin 4 as shown below.

This example demonstrates a worst case analysis for the opamp output stage. This occurs when the output voltage is 1/2 the power supply voltage. Under this condition, maximum power transfer occurs and the output is under maximum stress. Conditions: Vcc=16VDC Vo=8Vp Sine Wave, Freq.= 1KHz RL=510 For a worst case analysis we treat the +8Vp sine wave an 8 VDC output voltage. 1.) Find driver power dissipation PD = (Vcc-Vo) (Vo/RL) 125.5mW 2.) For conservative design, set TJ=+125C 3.) For this example, worst caseTA=+100C 4.) RJC= 187C/W from MSK 032B Data Sheet 5.) RCS= 0.15C/W for most thermal greases 6.) Rearrange governing equation to solve for RSA

The recommended capacitor value is 0.01F and the resistor value can range from to 500. The effects of this R-C snubber can be seen on the typical performance curve labeled Slew Rate VS. Compensation Resistance. The graph clearly illustrates the decrease in transition time as snubber resistance increases. This occurs because the high frequency components of the input square wave are above the corner frequency of the R-C snubber and are applied common mode to the bases of the second differential pair, (pins 3 and 4). There is no differential gain for these higher frequencies since the input signal is applied common mode. Without the high frequency components appearing at the output, the slew rate and bandwidth of the opamp are limited. However, at the cost of speed and bandwidth the user gains circuit stability. A good design rule to follow is: as closed loop gain decreases, circuit stability decreases, therefore snubber resistance should decrease to maintain stability and avoid oscillation. The MSK 032 can also be compensated using the standard LH0032 techniques.

Both the negative and 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 a 0.1 microfarad ceramic capacitor in parallel with a 4.7 microfarad tantalum capacitor from each power supply pin to ground. 3 Rev. B 5/02


 

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