Overview
The LMH6551, produced by Texas Instruments, is a fully differential amplifier designed to provide low distortion amplification to wide bandwidth differential signals. This amplifier combines a core differential I/O, high-gain block with an output common-mode sense, allowing for precise control over the output common-mode voltage. It is particularly suited for high-speed applications requiring minimal distortion and high signal integrity.
The LMH6551 features a unique architecture that includes a common-mode feedback circuit, enabling single-ended to differential operation and ensuring that the output signals are of equal magnitude and opposite phase. This makes it highly versatile for various high-performance applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| 0.1 dB Bandwidth | VOUT = 2 VPP | - | 50 | - | MHz |
| Slew Rate | 4-V Step | - | 2400 | - | V/μs |
| Settling Time to 0.05% | 4-V Step | - | 18 | - | ns |
| Harmonic Distortion (HD2/HD3) at 5 MHz | - | -94/-96 | - | - | dBc |
| Input Offset Voltage (Differential Mode) | VID = 0, VCM = 0 | - | ±4 | - | mV |
| Input Bias Current | - | -4 | 0 | -10 | μA |
| Operating Temperature Range | - | -40 | - | 125 | °C |
| Total Supply Voltage | - | 3 | - | 12 | V |
| Package Types | - | SOIC (8), VSSOP (8) | - | - | - |
Key Features
- High-Speed Operation: The LMH6551 offers a 50 MHz 0.1 dB bandwidth and a slew rate of 2400 V/μs, making it suitable for high-speed applications.
- Low Distortion: With harmonic distortion (HD2/HD3) of −94/−96 dB at 5 MHz, this amplifier ensures minimal signal distortion.
- Flexible Gain Setting: The amplifier can be used at any desired gain with external gain set resistors.
- Common-Mode Feedback Circuit: This circuit allows for single-ended to differential operation and precise control over the output common-mode voltage.
- Compact Packaging: Available in space-saving SOIC and VSSOP packages.
- Wide Operating Range: Operates over a temperature range of −40°C to +125°C and with total supply voltages from 3 V to 12 V.
Applications
- Differential AD Driver: Ideal for driving high-performance ADCs.
- Video Over Twisted Pair: Suitable for video transmission over twisted-pair cables.
- Differential Line Driver: Can drive signals over balanced transmission lines like CAT 5 data cables.
- Single End to Differential Converter: Converts single-ended signals to differential signals.
- High-Speed Differential Signaling: Used in high-speed differential signaling applications.
- IF/RF Amplifier: Suitable for use as an IF amplifier in high-performance communications equipment.
- SAW Filter Buffer/Driver: Can be used as a buffer or driver for SAW filters.
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.
- What is the settling time of the LMH6551 to 0.05%?
The settling time of the LMH6551 to 0.05% is 18 ns.
- What are the harmonic distortion levels (HD2/HD3) at 5 MHz for the LMH6551?
The harmonic distortion levels (HD2/HD3) at 5 MHz are −94/−96 dB.
- What is the input offset voltage of the LMH6551 in differential mode?
The input offset voltage of the LMH6551 in differential mode is ±4 mV.
- What are the package types available 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 of the LMH6551 is −40°C to +125°C.
- What is the total supply voltage range for the LMH6551?
The total supply voltage range for the LMH6551 is 3 V to 12 V.
- Can the LMH6551 be used as a single-ended to differential converter?
Yes, the LMH6551 can be used as a single-ended to differential converter.
- What are some common applications of the LMH6551?
The LMH6551 is commonly used in applications such as differential AD drivers, video over twisted pair, differential line drivers, high-speed differential signaling, IF/RF amplifiers, and SAW filter buffers/drivers.
