Overview
The LMH6645MFX, produced by Texas Instruments (originally developed by National Semiconductor), is a single-channel, rail-to-rail input and output operational amplifier. This device is renowned for its high speed, low voltage operation, and micro-power consumption, making it ideal for a variety of applications where space and power efficiency are critical.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| -3dB Bandwidth (BW) | 40 | 55 | - | MHz |
| Supply Voltage Range | 2.5 | - | 12 | V |
| Slew Rate | 15 | 22 | - | V/μs |
| Supply Current (per channel) | 650 | - | 1250 | μA |
| Output Short Circuit Current | - | - | 42 | mA |
| Linear Output Current | - | - | ±20 | mA |
| Input Common Mode Voltage | -0.3 | - | V+ + 0.3 | V |
| Input Offset Voltage | -4 | - | 4 | mV |
| Input Bias Current | -0.68 | 0.40 | 2.2 | μA |
| Power Supply Rejection Ratio (PSRR) | 75 | - | 95 | dB |
Key Features
- High Speed Operation: The LMH6645MFX offers a -3dB bandwidth of 55 MHz and a slew rate of 22 V/μs, making it suitable for high-speed applications.
- Low Voltage Operation: It operates within a supply voltage range of 2.5V to 12V, with a typical supply current of 650 μA per channel.
- Rail-to-Rail Input and Output: The input common mode voltage range exceeds the supply rails by 0.3V, and the output voltage swing is within 20 mV of the supply rails.
- Micro-Power Shutdown: The LMH6647 variant of this family includes a shutdown feature with a turn-off current of less than 50 μA, ideal for power-saving and multiplexing applications.
- Compact Packaging: Available in SOT-23, VSSOP-8, and SOIC-8 packages, making it suitable for applications where board space is limited.
Applications
- Active Filters: Ideal for designing high-speed active filters.
- High Speed Portable Devices: Suitable for use in portable devices requiring low power consumption and high speed.
- Multiplexing Applications: The LMH6647 variant is particularly useful in multiplexing applications due to its shutdown capability.
- Current Sense Buffer: Can be used as a buffer in current sensing applications.
- High Speed Transducer Amp: Suitable for high-speed transducer amplification.
Q & A
Q1: What is the typical supply current of the LMH6645MFX?
- The typical supply current of the LMH6645MFX is 650 μA per channel.
Q2: What is the -3dB bandwidth of the LMH6645MFX?
- The -3dB bandwidth of the LMH6645MFX is 55 MHz.
Q3: What is the slew rate of the LMH6645MFX?
- The slew rate of the LMH6645MFX is 22 V/μs.
Q4: What is the input common mode voltage range of the LMH6645MFX?
- The input common mode voltage range exceeds the supply rails by 0.3V.
Q5: What are the available package options for the LMH6645MFX?
- The LMH6645MFX is available in SOT-23, VSSOP-8, and SOIC-8 packages.
Q6: Does the LMH6645MFX have a shutdown feature?
- The LMH6647 variant of this family includes a shutdown feature, but not the LMH6645MFX itself.
Q7: What is the typical output short circuit current of the LMH6645MFX?
- The typical output short circuit current is 42 mA.
Q8: What is the linear output current capability of the LMH6645MFX?
- The linear output current capability is ±20 mA.
Q9: What is the power supply rejection ratio (PSRR) of the LMH6645MFX?
- The PSRR ranges from 75 dB to 95 dB.
Q10: What is the operating temperature range of the LMH6645MFX?
- The operating temperature range is -40°C to 85°C.
