Overview
The LMH6551MMX/NOPB, produced by Texas Instruments, is a fully differential amplifier designed to provide low distortion amplification to wide bandwidth differential signals. This device is part of the LMH integrated circuits family and is optimized for high-speed and low-distortion applications. It features a unique architecture that includes two signal path channels and a common-mode feedback circuit, enabling single-ended to differential operation and ensuring that the output signals are of equal magnitude and opposite phase.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| 0.1-dB Bandwidth | VOUT = 2 VPP | 50 | MHz | ||
| Slew Rate | 4-V Step | 1800 | V/μs | ||
| Settling Time to 0.05% | 4-V Step | 17 | ns | ||
| Harmonic Distortion (HD2/HD3) | f = 5 MHz, RL = 800 Ω | -94/-96 | dBc | ||
| Input Offset Voltage (Differential Mode) | VID = 0, VCM = 0 | ±4 | ±6 | mV | |
| Common-Mode Rejection Ratio (CMRR) | DC, VCM = 0 V, VID = 0 V | 72 | 80 | dBc | |
| Supply Voltage | 3 | 12 | V | ||
| Operating Temperature Range | -40 | 125 | °C |
Key Features
- High-Speed Operation: The LMH6551 offers a 0.1-dB bandwidth of 50 MHz and a slew rate of 1800 V/μs, making it suitable for high-frequency applications.
- Low Distortion: With harmonic distortion as low as -94/-96 dBc at 5 MHz, this amplifier is ideal for applications requiring minimal signal distortion.
- Flexible Gain Setting: The device can be configured for any desired gain using external resistors, enhancing its versatility in various applications.
- Single-Ended to Differential Conversion: The LMH6551 can convert single-ended inputs to differential outputs, which is crucial for driving balanced transmission lines and high-performance ADCs.
- Compact Packaging: Available in space-saving SOIC and VSSOP packages, making it suitable for dense PCB designs.
- Power Management: The device includes a power-down feature that shuts off the quiescent current when not in use, helping to conserve power.
Applications
- Differential AD Driver: Ideal for driving high-performance analog-to-digital converters (ADCs).
- Video Over Twisted-Pair: Suitable for video transmission over twisted-pair cables.
- Differential Line Driver: Used for driving signals over balanced transmission lines like CAT 5 data cables.
- Single End to Differential Converter: Converts single-ended signals to differential signals, useful in various communication systems.
- IF/RF Amplifier: Can be used as an intermediate frequency (IF) or radio frequency (RF) amplifier in high-performance communications equipment.
- SAW Filter Buffer/Driver: Suitable for buffering and driving surface acoustic wave (SAW) filters.
Q & A
- What is the typical 0.1-dB bandwidth of the LMH6551?
The typical 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 1800 V/μs for a 4-V step.
- How does the LMH6551 handle single-ended to differential conversion?
The LMH6551 includes a common-mode feedback circuit that allows it to convert single-ended inputs to differential outputs.
- What are the typical harmonic distortion values for the LMH6551 at 5 MHz?
The typical harmonic distortion values are -94/-96 dBc at 5 MHz.
- What is the operating temperature range of the LMH6551?
The operating temperature range is from -40°C to +125°C.
- Can the gain of the LMH6551 be adjusted?
Yes, the gain of the LMH6551 can be adjusted using external resistors.
- What are the available package options for the LMH6551?
The LMH6551 is available in SOIC and VSSOP packages.
- Does the LMH6551 have a power-down feature?
Yes, the LMH6551 includes a power-down feature that can be activated by asserting the PD pin low.
- What is the typical supply current of the LMH6551?
The typical supply current is around 11-12.5 mA, depending on the supply voltage.
- What are some common applications of the LMH6551?
Common applications include differential AD drivers, video over twisted-pair, differential line drivers, single end to differential converters, IF/RF amplifiers, and SAW filter buffers/drivers.
