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Hello, Please ask a question about MSK738_15 Datasheet
# Example questions:
➢ What are the two primary considerations when selecting external components for optimal performance of the msk 738(b)?
➢ The datasheet mentions a formula for calculating the change in input offset voltage drift (∆vosd) when trimming the offset. if a trimmed offset voltage (vos) is 150µv, what is the expected change in offset voltage drift?
➢ What is the maximum allowable power dissipation (pd) if the ambient temperature (ta) is 90°c, the junction temperature (tj) must not exceed 125°c, and a heat sink with a thermal resistance (rθsa) of 8.5°c/w is used, given rθjc = 46°c/w and rθcs = 0.15°c/w?
| Part No. | MSK738_15 |
| Manufacturer | MSK |
| Size | 421 Kbytes |
| Pages | 5 pages |
| Description | Wide Bandwidth |
1. General Information & Purpose:
️· Product: MSK 738 Operational Amplifier
️· Purpose: This datasheet provides specifications, application notes, and ordering information for the MSK 738 Op Amp. It focuses on heat sinking and offset nulling.
️· Manufacturer: M.S. Kennedy Corp.
️· Contact: Phone (315) 701-6751, FAX (315) 701-6752, www.mskennedy.com
2. Key Specifications (From Tables - Partial List):
️· Supply Voltage (Vcc): ±16VDC (used in the example calculation)
️· Output Voltage Swing: ±10V (at RL=100 ohms, Av = -3V/V, F≤20MHz)
️· Output Current: ±100 mA
️· Slew Rate: 3500 V/µs
️· Full Power Bandwidth: 20 MHz
️· Bandwidth (Small Signal): 190 MHz
️· Input Offset Voltage: Typically < ±25 µV
️· Input Noise Voltage: 0.15 µVp-p (at 0.1 Hz to 10 Hz)
️· Input Noise Voltage Density: 3.8 nV/√Hz (at 1 kHz)
️· Input Offset Current: <2nA (typical)
️· Input Bias Current: <20nA (typical)
️· Input Impedance: 5 MΩ
3. Heat Sinking & Thermal Considerations:
️· Governing Equation for Heat Dissipation: T<sub>J</sub> = P<sub>D</sub> x (R<sub>θJC</sub> + R<sub>θCS</sub> + R<sub>θSA</sub>) + T<sub>A</sub>
- T<sub>J</sub> = Junction Temperature
- P<sub>D</sub> = Total Power Dissipation
- R<sub>θJC</sub> = Junction-to-Case Thermal Resistance
- R<sub>θCS</sub> = Case-to-Heat Sink Thermal Resistance
- R<sub>θSA</sub> = Heat Sink-to-Ambient Thermal Resistance
- T<sub>A</sub> = Ambient Temperature
️· Example Calculation (Worst-Case Output Stage):
- Conditions: Vcc = ±16V, Sine Wave Output (8Vp) at 1 kHz, RL = 100Ω
- Power Dissipation (P<sub>D</sub>) = 0.64 W
- Required Heat Sink Thermal Resistance (R<sub>θSA</sub>) = 8.5 °C/W (to maintain T<sub>J</sub> = +125°C with T<sub>A</sub> = +90°C)
️· R<sub>θJC</sub> = 46 °C/W (from MSK 738B Data Sheet)
️· R<sub>θCS</sub> = 0.15 °C/W (typical)
4. Offset Nulling:
️· Purpose: To adjust the input offset voltage (typically < ±25 µV).
️· Method: Use a ten-turn 10KΩ potentiometer.
️· Drift Consideration: Using a potentiometer introduces a small amount of drift. The drift is approximated by the formula: ∆V<sub>OSD</sub> = V<sub>OS (trimmed)</sub> / 250
️· Potentiometer Values: 1KΩ to 1MΩ can be used.
5. Ordering Information:
️· Part Numbering: General Part Number, Screening Code (e.g., Blank = Industrial, B = MIL-PRF-38534 Class H, E = Extended Reliability)
️· MIL-PRF-38534: Available (B Suffix)
6. Notes:
️· The example uses worst case assumptions for design.
️· Continuous operation beyond absolute maximum ratings can affect performance and life.
1. General Information & Purpose:
️· Product: MSK 738 Operational Amplifier
️· Purpose: This datasheet provides specifications, application notes, and ordering information for the MSK 738 Op Amp. It focuses on heat sinking and offset nulling.
️· Manufacturer: M.S. Kennedy Corp.
️· Contact: Phone (315) 701-6751, FAX (315) 701-6752, www.mskennedy.com
2. Key Specifications (From Tables - Partial List):
️· Supply Voltage (Vcc): ±16VDC (used in the example calculation)
️· Output Voltage Swing: ±10V (at RL=100 ohms, Av = -3V/V, F≤20MHz)
️· Output Current: ±100 mA
️· Slew Rate: 3500 V/µs
️· Full Power Bandwidth: 20 MHz
️· Bandwidth (Small Signal): 190 MHz
️· Input Offset Voltage: Typically < ±25 µV
️· Input Noise Voltage: 0.15 µVp-p (at 0.1 Hz to 10 Hz)
️· Input Noise Voltage Density: 3.8 nV/√Hz (at 1 kHz)
️· Input Offset Current: <2nA (typical)
️· Input Bias Current: <20nA (typical)
️· Input Impedance: 5 MΩ
3. Heat Sinking & Thermal Considerations:
️· Governing Equation for Heat Dissipation: T<sub>J</sub> = P<sub>D</sub> x (R<sub>θJC</sub> + R<sub>θCS</sub> + R<sub>θSA</sub>) + T<sub>A</sub>
- T<sub>J</sub> = Junction Temperature
- P<sub>D</sub> = Total Power Dissipation
- R<sub>θJC</sub> = Junction-to-Case Thermal Resistance
- R<sub>θCS</sub> = Case-to-Heat Sink Thermal Resistance
- R<sub>θSA</sub> = Heat Sink-to-Ambient Thermal Resistance
- T<sub>A</sub> = Ambient Temperature
️· Example Calculation (Worst-Case Output Stage):
- Conditions: Vcc = ±16V, Sine Wave Output (8Vp) at 1 kHz, RL = 100Ω
- Power Dissipation (P<sub>D</sub>) = 0.64 W
- Required Heat Sink Thermal Resistance (R<sub>θSA</sub>) = 8.5 °C/W (to maintain T<sub>J</sub> = +125°C with T<sub>A</sub> = +90°C)
️· R<sub>θJC</sub> = 46 °C/W (from MSK 738B Data Sheet)
️· R<sub>θCS</sub> = 0.15 °C/W (typical)
4. Offset Nulling:
️· Purpose: To adjust the input offset voltage (typically < ±25 µV).
️· Method: Use a ten-turn 10KΩ potentiometer.
️· Drift Consideration: Using a potentiometer introduces a small amount of drift. The drift is approximated by the formula: ∆V<sub>OSD</sub> = V<sub>OS (trimmed)</sub> / 250
️· Potentiometer Values: 1KΩ to 1MΩ can be used.
5. Ordering Information:
️· Part Numbering: General Part Number, Screening Code (e.g., Blank = Industrial, B = MIL-PRF-38534 Class H, E = Extended Reliability)
️· MIL-PRF-38534: Available (B Suffix)
6. Notes:
️· The example uses worst case assumptions for design.
️· Continuous operation beyond absolute maximum ratings can affect performance and life.
| Part No. | MSK738_15 |
| Manufacturer | MSK |
| Size | 421 Kbytes |
| Pages | 5 pages |
| Description | Wide Bandwidth |
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