LME49710HABD National Semiconductor, LME49710HABD Datasheet - Page 24
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LME49710HABD
Manufacturer Part Number
LME49710HABD
Description
BOARD EVALUATION LME49710HA
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheet
1.LME49710HABD.pdf
(28 pages)
Specifications of LME49710HABD
Channels Per Ic
1 - Single
Amplifier Type
Audio
Output Type
Single-Ended
Slew Rate
20 V/µs
Current - Output / Channel
26mA
Operating Temperature
-40°C ~ 85°C
Current - Supply (main Ic)
4.8mA
Voltage - Supply, Single/dual (±)
±2.5 V ~ 17 V
Board Type
Fully Populated
Utilized Ic / Part
LME49710
Lead Free Status / RoHS Status
Not applicable / Not applicable
-3db Bandwidth
-
www.national.com
Application Information
DISTORTION MEASUREMENTS
The vanishingly low residual distortion produced by
LME49710 is below the capabilities of all commercially avail-
able equipment. This makes distortion measurements just
slightly more difficult than simply connecting a distortion me-
ter to the amplifier’s inputs and outputs. The solution, how-
ever, is quite simple: an additional resistor. Adding this
resistor extends the resolution of the distortion measurement
equipment.
The LME49710’s low residual distortion is an input referred
internal error. As shown in Figure 2, adding the 10Ω resistor
connected between the amplifier’s inverting and non-inverting
FIGURE 2. THD+N and IMD Distortion Test Circuit
24
inputs changes the amplifier’s noise gain. The result is that
the error signal (distortion) is amplified by a factor of 101. Al-
though the amplifier’s closed-loop gain is unaltered, the feed-
back available to correct distortion errors is reduced by 101,
which means that measurement resolution increases by 101.
To ensure minimum effects on distortion measurements,
keep the value of R1 low as shown in Figure 2.
This technique is verified by duplicating the measurements
with high closed loop gain and/or making the measurements
at high frequencies. Doing so produces distortion compo-
nents that are within the measurement equipment’s capabili-
ties. This datasheet’s THD+N and IMD values were generat-
ed using the above described circuit connected to an Audio
Precision System Two Cascade.
20210407