Overview
The LMH6551MM from Texas Instruments is a fully differential amplifier designed to provide low distortion amplification to wide bandwidth differential signals. This high-speed op-amp is integrated for ultimate balance and distortion performance, making it suitable for various high-performance applications. The device includes three functional channels: two signal path channels and a common-mode feedback circuit, which ensures the output common mode is set and the outputs are equal in magnitude and opposite in phase, even with single-ended input operation.
Key Specifications
| Parameter | Typical Value | Unit |
|---|---|---|
| 0.1 dB Bandwidth | 50 MHz | |
| Slew Rate | 2400 V/µs | |
| Settling Time to 0.05% | 18 ns | |
| Second and Third Harmonic Distortion (HD2/HD3) at 5 MHz | -94/-96 dB | |
| Input Offset Voltage (Differential Mode) | ±4 mV | |
| Input Bias Current | -4 to 0 µA | |
| Common-Mode Rejection Ratio (CMRR) | 78 dB | |
| Operating Temperature Range | -40 to +125 °C | |
| Total Supply Voltage | 3 to 12 V | |
| Package Types | SOIC (8), VSSOP (8) |
Key Features
- High speed and low distortion, making it suitable for driving high-performance ADCs and handling signals over balanced transmission lines like CAT 5 data cables.
- Gain flexibility with external gain set resistors, allowing use at any desired gain.
- Common-mode feedback circuit for single-ended to differential operation.
- Internal averaging resistor network to sense and control output common-mode voltage.
- Low input offset voltage and high common-mode rejection ratio.
- Space-saving SOIC and VSSOP packages.
Applications
- Differential AD Driver
- Video Over Twisted-Pair
- Differential Line Driver
- Single End to Differential Converter
- High-Speed Differential Signaling
- IF/RF Amplifier
- SAW Filter Buffer/Driver
Q & A
- What is the typical 0.1 dB bandwidth of the LMH6551MM?
The typical 0.1 dB bandwidth of the LMH6551MM is 50 MHz.
- What is the slew rate of the LMH6551MM?
The slew rate of the LMH6551MM is 2400 V/µs.
- How long does the LMH6551MM take to settle to 0.05%?
The settling time to 0.05% for the LMH6551MM is 18 ns.
- What are the typical second and third harmonic distortion values at 5 MHz?
The typical second and third harmonic distortion values at 5 MHz are -94/-96 dB.
- What is the input offset voltage of the LMH6551MM in differential mode?
The input offset voltage in differential mode is ±4 mV.
- What is the common-mode rejection ratio (CMRR) of the LMH6551MM?
The CMRR of the LMH6551MM is 78 dB.
- What are the operating temperature and supply voltage ranges for the LMH6551MM?
The operating temperature range is -40 to +125 °C, and the total supply voltage range is 3 to 12 V.
- In what packages is the LMH6551MM available?
The LMH6551MM is available in SOIC (8) and VSSOP (8) packages.
- What are some common applications of the LMH6551MM?
Common applications include differential AD drivers, video over twisted-pair, differential line drivers, single end to differential converters, high-speed differential signaling, IF/RF amplifiers, and SAW filter buffer/drivers.
- How does the LMH6551MM handle single-ended to differential conversion?
The LMH6551MM uses a common-mode feedback circuit to handle single-ended to differential conversion, ensuring the outputs are equal in magnitude and opposite in phase.
