Single Channel, 2.7V, 650µA, 55MHz, Rail-to-Rail Input and Output Amplifier
Product details
Parameters
Package | Pins | Size
Features
- (VS = 2.7V, TA = 25°C, RL = 1kΩ to V+/2, AV = +1.
Typical Values Unless Specified. - −3dB BW 55 MHz
- Supply Voltage Range 2.5 V to 12 V
- Slew Rate 22 V/µs
- Supply Current 650 µA/channel
- Output Short Circuit Current 42 mA
- Linear Output Current ±20 mA
- Input Common Mode Voltage 0.3 V Beyond Rails
- Output Voltage Swing 20 mV from Rails
- Input Voltage Noise 17 nV/√Hz
- Input Current Noise 0.75 pA/√Hz
Description
The LMH6645 (single) and LMH6646 (dual), rail-to-rail input and output voltage feedback amplifiers, offer high speed (55 MHz), and low voltage operation (2.7 V) in addition to micro-power shutdown capability (LMH6647, single).
Input common mode voltage range exceeds either supply by 0.3 V, enhancing ease of use in multitude of applications where previously only inferior devices could be used. Output voltage range extends to within 20 mV of either supply rails, allowing wide dynamic range especially in low voltage applications. Even with low supply current of 650 µA/amplifier, output current capability is kept at a respectable ±20 mA for driving heavier loads. Important device parameters such as BW, Slew Rate and output current are kept relatively independent of the operating supply voltage by a combination of process enhancements and design architecture.
In portable applications, the LMH6647 provides shutdown capability while keeping the turn-off current to less than 50 µA. Both turn-on and turn-off characteristics are well behaved with minimal output fluctuations during transitions. This allows the part to be used in power saving mode, as well as multiplexing applications. Miniature packages (SOT-23, VSSOP-8, and SOIC-8) are further means to ease the adoption of these low power high speed devices in applications where board area is at a premium.
Same functionality and pinout but is not an equivalent to the compared device:
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | LMH664x 2.7 V, 650 uA, 55 MHz, Rail-to-Rail I/O Amplifiers w/Shutdown Option datasheet (Rev. D) | Nov. 25, 2014 |
| Technical articles | How to reduce distortion in high-voltage, high-frequency signal generation for AWGs | Oct. 30, 2018 | |
| Technical articles | What are the advantages of using JFET-input amplifiers in high-speed applications? | Jun. 18, 2018 | |
| Technical articles | Unique active mux capability combines buffer and switch into one solution | Oct. 10, 2017 | |
| E-book | The Signal e-book: A compendium of blog posts on op amp design topics | Mar. 28, 2017 | |
| Technical articles | How to minimize filter loss when you drive an ADC | Oct. 20, 2016 | |
| Application note | AN-1515 A Comprehensive Study of the Howland Current Pump (Rev. A) | Apr. 26, 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
Texas Instruments offers this unpopulated Evaluation Board to aid in the evaluation and testing of high-speed Op Amps that are offered in the 5-/6-pin SOT-23 package. Resistors, capacitors, or any other surface-mount components can be easily mounted on this board in the desired circuit (...)
Features
- Accommodates various high-speed Op Amp
- Allows quick and easy evaluation
- Serves as reference design to aid in high-speed PCB layout
- Utilizes surface-mount components
Description
Texas Instruments offers this unpopulated Evaluation Board to aid in the evaluation and testing of high-speed Op Amp that are offered in the 8-Pin SOIC package. Resistors, capacitors, or any other surface-mount components can be easily mounted on this board in the desired circuit configuration. The (...)
Features
- Accommodates various high-speed Op Amp
- Allows quick and easy evaluation
- Serves as reference design to aid in high-speed PCB layout
- Utilizes surface-mount components
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Features
- Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
- Noise calculations
- Common unit translation
- Solves common amplifier circuit design problems
- Gain selections using standard resistors
- Filter configurations
- Total noise for common amplifier configurations
- (...)
(...)
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| SOIC (D) | 8 | View options |
| SOT-23 (DBV) | 5 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Support & training
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