Features
| • | Optimized for superior audio signal fidelity |
| • | Output short circuit protection |
| • | PSRR and CMRR exceed 120dB (typ) |
Description The LME49725 is part of the ultra-low distortion, low noise, high slew rate operational amplifier series optimized and fully
specified for high performance, high fidelity applications. Combining advanced leading-edge process technology with state-of-the-art
circuit design, the LME49725 audio operational amplifiers deliver superior audio signal amplification for outstanding audio
performance. The LME49725 combines extremely low voltage noise density (3.3nV/
√
^Hz) with vanishingly low THD+N (0.00004%) to easily satisfy the most demanding audio applications. To ensure that the most challenging
loads are driven without compromise, the LME49725 has a high slew rate of ±15V/μs and an output current capability of ±22mA.
Further, dynamic range is maximized by an output stage that drives 2kΩ loads to within 1V of either power supply voltage and
to within 1.4V when driving 600Ω loads.
Part of the PowerWise® family of energy efficient solutions, the LME49725 consumes only 3.0mA of supply current per amplifier
while providing superior performance to high performance, high fidelity applications.
The LME49725's outstanding CMRR (120dB), PSRR (120dB), and VOS (0.5mV) give the amplifier excellent operational amplifier DC performance.
The LME49725 has a wide supply range of ±4.5V to ±18V. Over this supply range the LME49725’s input circuitry maintains excellent
common-mode and power supply rejection, as well as maintaining its low input bias current. The LME49725 is unity gain stable.
This audio operational amplifier achieves outstanding AC performance while driving complex loads with values as high as 100pF.
The LME49725 is available in 8–lead narrow body SOIC.
Key Specification
| ■
Power Supply Voltage Range
|
±4.5V to ±18V
|
| ■
THD+N
(AV = 1, VOUT = 3VRMS, fIN = 1kHz)
|
|
| RL = 2kΩ
|
0.00004% (typ)
|
| RL = 600Ω
|
0.00004% (typ)
|
| ■
Quiescent current per Amplifier
|
3.0mA (typ)
|
| ■
Input Noise Density
|
3.3nV/
√
^Hz (typ)
|
| ■
Slew Rate
|
±15V/μs (typ)
|
| ■
Gain Bandwidth Product
|
40MHz (typ)
|
| ■
Open Loop Gain (RL = 600Ω)
|
135dB (typ)
|
| ■
Input Bias Current
|
15nA (typ)
|
| ■
Input Offset Voltage
|
0.5mV (typ)
|
| ■
DC Gain Linearity Error
|
0.000009% (typ)
|
Applications
| • | Audio amplification |
| • | Preamplifiers |
| • | Multimedia |
| • | Phono preamplifiers |
| • | Professional audio |
| • | Equalization and crossover networks |
| • | Line drivers |
| • | Line receivers |
| • | Active filters |
|
|
