Overview
The LMH6551MM/NOPB, produced by Texas Instruments, is a high-performance voltage feedback differential amplifier. This device is part of the LMH integrated circuits family and is designed to offer high speed and low distortion, making it suitable for various high-frequency applications. The LMH6551 combines a core differential I/O block with an output common-mode sense and feedback mechanism to control the average output voltage, ensuring stable and precise operation.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Operating Temperature Range | -40 | 85 | °C | |
| Total Supply Voltage | 3 | 12 | V | |
| Small Signal -3 dB Bandwidth | 350 | MHz | ||
| Large Signal -3 dB Bandwidth | 300 | MHz | ||
| 0.1 dB Bandwidth | 50 | MHz | ||
| Slew Rate | 1800 | V/μs | ||
| Rise/Fall Time, 10% to 90% | 2 | ns | ||
| Settling Time to 0.05% | 17 | ns | ||
| Input Offset Voltage (Differential Mode) | ±4 | ±6 | mV | |
| Input Bias Current | -4 | 0 | μA | |
| Common-Mode Rejection Ratio (DC) | 78 | dBc |
Key Features
- 370 MHz small signal -3 dB bandwidth (VOUT = 0.5 VPP)
- 50 MHz 0.1 dB bandwidth
- 2400 V/μs slew rate (though typically specified as 1800 V/μs in detailed datasheets)
- 18 ns settling time to 0.05%
- 94/96 dB HD2/HD3 at 5 MHz, indicating low harmonic distortion
- Differential I/O block with high open-loop gain and internal averaging resistor network for output common-mode voltage sensing
- Output common-mode voltage control via VOCM pin, which can be set to a target voltage or left open to default to an internal midsupply value
- Power-down feature with PD pin to disable the amplifier and reduce quiescent current
Applications
- Driving high-performance Analog-to-Digital Converters (ADCs)
- Driving signals over balanced transmission lines such as CAT5/6 cables
- High-frequency signal processing and amplification in various communication and industrial systems
- Professional audio equipment and high-fidelity audio systems requiring low distortion and high bandwidth
- Medical imaging and diagnostic equipment where high-speed and low-noise amplification is critical
Q & A
- What is the operating temperature range of the LMH6551MM/NOPB?
The operating temperature range is -40°C to 85°C
- What is the typical small signal -3 dB bandwidth of the LMH6551MM/NOPB?
The typical small signal -3 dB bandwidth is 350 MHz
- How does the LMH6551MM/NOPB control the output common-mode voltage?
The output common-mode voltage is controlled via the VOCM pin, which can be set to a target voltage or left open to default to an internal midsupply value
- What is the slew rate of the LMH6551MM/NOPB?
The slew rate is typically 1800 V/μs
- Can the LMH6551MM/NOPB be powered down to reduce quiescent current?
- What is the common-mode rejection ratio (CMRR) of the LMH6551MM/NOPB?
The CMRR is 78 dBc in DC conditions
- What is the input offset voltage of the LMH6551MM/NOPB in differential mode?
The input offset voltage in differential mode is ±4 mV, with a maximum of ±6 mV at extreme temperatures
- What is the settling time of the LMH6551MM/NOPB to 0.05%?
The settling time to 0.05% is 17 ns
- What are some typical applications of the LMH6551MM/NOPB?
Typical applications include driving high-performance ADCs, driving signals over balanced transmission lines, and use in high-frequency signal processing and amplification in various systems
- Is the LMH6551MM/NOPB RoHS compliant?
