LME49724 Datasheet, PDF (19/30 Pages) National Semiconductor (TI) – High Performance, High Fidelity, Fully-Differential Audio Operational Amplifier

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LME49724
SNAS438A – NOVEMBER 2008 – REVISED APRIL 2013
Figure 54. THD+N and IMD Distortion Test Circuit
PERFORMANCE VARIATIONS
The LME49724 has excellent performance with little variation across different supply voltages, load impedances,
and input configuration (single-ended or differential). Inspection of the THD+N vs Frequency and THD+N vs
Output Voltage performance graphs (See Typical Performance Characteristics reveals only minimal differences
with different load values. Figure 55 and Figure 56 below show the performance across different supply voltages
with the same output signal level and load. Figure 55 has plots at ±5V, ±12V, ±15V, and ±18V with a 3V_RMS
output while Figure 56 has plots at ±12V, ±15V, and ±18V with a 10V_RMS output. Both figures use a 600Ω load.
The performance for each different supply voltage under the same conditions is so similar it is nearly impossible
to discern the different plots lines.
Figure 55. THD+N vs FREQUENCY with R_L = 600Ω
V_OUT = 3V_RMS, Differential Input, 80kHz BW
V_S = ±5V, ±12V, ±15V, and ±18V
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