AD648CH vs HA7-2548-9
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| Category | Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps | Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps |
| Manufacturer | Analog Devices Inc. | Harris Corporation |
| Description | DUAL OP AMP | OPERATIONAL AMPLIFIER |
| Package | Bulk | Bulk |
| Series | - | - |
| Operating Temperature | 0°C ~ 70°C | -55°C ~ 125°C |
| Mounting Type | Surface Mount | Through Hole |
| Package / Case | 8-SOIC (0.154\", 3.90mm Width) | 8-CDIP (0.300\", 7.62mm) |
| Supplier Device Package | 8-SOIC | 8-CERDIP |
| Current - Supply | 340µA (x2 Channels) | 12mA |
| Output Type | - | - |
| Number of Circuits | 2 | 1 |
| Voltage - Supply, Single/Dual (±) | ±4.5V ~ 18V | 40V |
| Current - Output / Channel | 15 mA | 33 mA |
| -3db Bandwidth | 1 MHz | - |
| Amplifier Type | J-FET | General Purpose |
| Current - Input Bias | 3 pA | 5 nA |
| Voltage - Input Offset | 300 µV | 300 µV |
| Slew Rate | 1.8V/µs | 120V/µs |
| Gain Bandwidth Product | 1 MHz | 150 MHz |
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1. 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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2. 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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3. What is the effect of the op amp's out-of-range voltage on accuracy?
An out-of-phase voltage is the difference in voltage at which the output is not zero when the signal at the input is zero. A large out-of-phase voltage reduces the accuracy of a system, especially in high-gain applications, and selecting an op amp with a low out-of-phase voltage can improve accuracy.
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4. What are the application scenarios of buffer amplifiers?
Buffer amplifiers are commonly used in signal isolation, impedance matching, voltage follower and power amplification scenarios, and are suitable for protecting weak signal sources from load effects in signal processing chains.
