Overview
The LMH6551, produced by 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 to offer ultimate balance and distortion performance, making it suitable for various high-performance applications. The device includes three functional channels: two signal path channels similar to inverting mode operational amplifiers and a common-mode feedback circuit that sets the output common mode and ensures the outputs are of equal magnitude and opposite phase.
Key Specifications
| Parameter | Typical Value | Unit |
|---|---|---|
| 0.1 dB Bandwidth | 50 MHz | |
| Slew Rate | 2400 V/µs | |
| Settling Time to 0.05% | 18 ns | |
| Harmonic Distortion (HD2/HD3) at 5 MHz | −94/−96 dB | |
| Input Referred Voltage Noise (Freq ≥ 1 MHz) | 6.0 nV/√Hz | |
| Input Referred Noise Current (Freq ≥ 1 MHz) | 1.5 pA/√Hz | |
| Input Offset Voltage (Differential Mode) | ±4 mV | |
| Supply Voltage Range | 3 V to 12 V | |
| Operating Temperature Range | −40°C to +125°C | |
| Package Types | SOIC (8), VSSOP (8) |
Key Features
- High-speed operation with 50 MHz 0.1 dB bandwidth and 2400 V/µs slew rate.
- Low distortion, with −94/−96 dB HD2/HD3 at 5 MHz.
- Fast settling time of 18 ns to 0.05%.
- Gain flexibility with external gain set resistors.
- Common-mode feedback circuit for single-ended to differential operation.
- High open-loop gain stage with internal averaging resistor network.
- Power-down feature to reduce quiescent current.
- Available in 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 0.1 dB bandwidth of the LMH6551?
The 0.1 dB bandwidth of the LMH6551 is 50 MHz.
- What is the slew rate of the LMH6551?
The slew rate of the LMH6551 is 2400 V/µs.
- How long does the LMH6551 take to settle to 0.05%?
The LMH6551 settles to 0.05% in 18 ns.
- What are the typical harmonic distortion values for the LMH6551 at 5 MHz?
The typical harmonic distortion values are −94/−96 dB for HD2/HD3 at 5 MHz.
- What is the input referred voltage noise of the LMH6551?
The input referred voltage noise is 6.0 nV/√Hz for frequencies greater than or equal to 1 MHz.
- Can the LMH6551 be used in single-ended to differential conversion?
- What are the available package types for the LMH6551?
The LMH6551 is available in SOIC (8) and VSSOP (8) packages.
- What is the operating temperature range of the LMH6551?
The operating temperature range is −40°C to +125°C.
- Does the LMH6551 have a power-down feature?
- What are some common applications of the LMH6551?
