LMP7717MA vs RC4157M
| Part Number |
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| Category | Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps | Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps |
| Manufacturer | National Semiconductor | Fairchild Semiconductor |
| Description | IC CMOS 1 CIRCUIT 8SOIC | OPERATIONAL AMPLIFIER |
| Package | Bulk | Bulk |
| Series | LMP® | - |
| Operating Temperature | -40°C ~ 125°C | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 8-SOIC (0.154\", 3.90mm Width) | 14-SOIC (0.154\", 3.90mm Width) |
| Supplier Device Package | 8-SOIC | 14-SOIC |
| Current - Supply | 1.15mA | 5mA |
| Output Type | Rail-to-Rail | - |
| Number of Circuits | 1 | 4 |
| Voltage - Supply, Single/Dual (±) | 1.8V ~ 5.5V | 20V |
| Current - Output / Channel | 60 mA | 25 mA |
| -3db Bandwidth | - | - |
| Amplifier Type | CMOS | General Purpose |
| Current - Input Bias | 0.1 pA | 60 nA |
| Voltage - Input Offset | 10 µV | 1 mV |
| Slew Rate | 35V/µs | 1.6V/µs |
| Gain Bandwidth Product | 88 MHz | 19 MHz |
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1. How to choose the right instrumentation amplifier?
The input common-mode voltage range, gain-bandwidth product, noise performance, power consumption, temperature drift, and common-mode rejection ratio (CMRR) should be considered when selecting an instrumentation amplifier to ensure that it meets the accuracy requirements of a particular application.
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2. What is Common Mode Rejection Ratio (CMRR) and why is it important for instrumentation amplifiers?
CMRR indicates an instrumentation amplifier's ability to suppress common mode signals, with higher values being better. A high CMRR is especially important in noisy environments to ensure that the amplifier primarily amplifies differential signals and is not affected by common mode interference.
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3. How to achieve high accuracy and low drift in instrumentation amplifiers?
Select an amplifier with low bias current, low offset voltage, and low noise, and reduce the effect of temperature drift on accuracy through a stable power supply and proper temperature compensation circuit design.
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4. Why do buffer amplifiers have high input impedance and low output impedance?
A high input impedance ensures that no load is applied to the preamplifier circuitry, preventing signal degradation, while a low output impedance provides a large driving capacity, ensuring that the signal can be passed on to subsequent circuits without loss.
