Overview
The LME49990MAX/NOPB, produced by Texas Instruments, is an ultra-low distortion, ultra-low noise operational amplifier. This device is part of the Overture™ E-Series and is optimized for high-performance, high-fidelity applications. It combines exceptional low voltage noise density of 0.9 nV/√Hz with vanishingly low total harmonic distortion plus noise (THD+N) of 0.00001%. The LME49990 is known for its high slew rate of ±22 V/μs and its ability to drive 600Ω loads to within 2V of either power supply voltage, making it ideal for demanding audio and signal processing tasks.
Key Specifications
| Parameter | Typical | Maximum |
|---|---|---|
| Input Noise Density (f = 1kHz) | 0.9 nV/√Hz | 1.3 nV/√Hz |
| THD+N (AV = 1, VOUT = 3VRMS, fIN = 1kHz, RL = 600Ω) | 0.00001% | |
| Slew Rate | ±22 V/μs | |
| Gain Bandwidth (AV = 104, RL = 2kΩ, f = 90kHz) | 110 MHz | |
| PSRR | 144 dB | |
| CMRR | 137 dB | |
| Power Supply Voltage Range | ±5V to ±18V | |
| Output Current Capability | ±27mA | |
| Quiescent Current (VCC = ±15V) | 9 mA | 11 mA |
| Offset Voltage (VCC = ±18V) | 130 μV | 1000 μV |
Key Features
- Ultra-low noise density of 0.9 nV/√Hz
- Vanishingly low THD+N of 0.00001%
- High slew rate of ±22 V/μs
- Output current capability of ±27mA
- Unity gain stable
- Output short circuit protection
- Wide supply voltage range of ±5V to ±18V
- Available in 8-lead narrow body SOIC and VQFN packages
Applications
- Ultra-high quality audio signal processing
- Active filters
- Preamplifiers
- Spectrum analyzers
- Ultrasound preamplifiers
- Sigma-Delta ADC/DAC buffers
Q & A
- What is the typical input noise density of the LME49990 at 1 kHz?
The typical input noise density is 0.9 nV/√Hz at 1 kHz. - What is the maximum THD+N for the LME49990 when driving a 600Ω load?
The maximum THD+N is 0.00001% when driving a 600Ω load. - What is the slew rate of the LME49990?
The slew rate is ±22 V/μs. - What is the gain bandwidth of the LME49990?
The gain bandwidth is 110 MHz (typical) at AV = 104, RL = 2kΩ, and f = 90kHz. - What is the power supply rejection ratio (PSRR) of the LME49990?
The PSRR is 144 dB (typical). - What is the common-mode rejection ratio (CMRR) of the LME49990?
The CMRR is 137 dB (typical). - What is the output current capability of the LME49990?
The output current capability is ±27mA. - What are the package options for the LME49990?
The LME49990 is available in 8-lead narrow body SOIC and VQFN packages. - What are some typical applications of the LME49990?
Typical applications include ultra-high quality audio signal processing, active filters, preamplifiers, spectrum analyzers, ultrasound preamplifiers, and Sigma-Delta ADC/DAC buffers. - How should capacitive loads be handled with the LME49990?
Capacitive loads up to 100pF are allowable, but loads greater than 100pF must be isolated from the output using a series resistor to prevent stability issues.
