THS4521 datasheet(29/43 Pages) TI

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Audio Performance

-50

100

110

120

Frequency(kHz)

TOTALHARMONICDISTORTION+NOISE

THS4521MeasuredonAPAnalyzer

THS4521

SignalGenerator

THS452x

24.9 W

1kW

24.9 W

OCM

Open

From

Analyzer

OUT+

IN+

ToAP

Analyzer

S+

IN-

S-

0.22 F

OUT-

100

110

120

130

140

10k

15k

20k

25k

30k

35k

Frequency(Hz)

Generator

THS4521

=5.0V

G=1V/V

R =1k

=1V

S+

OUT

RMS

10-kHzOUTPUTSPECTRUM

THS4521onAPAnalyzer

THS4521

THS4522

THS4524

www.ti.com.................................................................................................................................................... SBOS458B – DECEMBER 2008 – REVISED MAY 2009

The

THS4521,

THS4522,

and

THS4524

family

provide excellent audio performance with very low

quiescent power. To show performance in the audio

band, the device was tested with a SYS-2722 audio

analyzer from Audio Precision. THD+N and FFT tests

were

performed

1-VRMS

output

voltage.

Performance is the same on both 3.3-V and 5-V

supplies. Figure 68 shows the test circuit used;

Figure 69 and Figure 70 show the performance of the

analyzer using internal loopback mode (generator)

together with the THS4521. Note that the harmonic

distortion performance is very close to the same with

and without the device meaning the THS4521

performance is actually much better than can be

directly measured by this meathod. Using these

measurements

and

simuation,

estimate

the

second-order harmonic distortion to be –133 dBc and

Figure 69. THS4521 1-VRMS 20-Hz to 20-kHz

the third-order harmonic distortion to be –140 dBc at

THD+N

10 kHz. Note that the circuit of Figure 68 is also used

to measure crosstalk between channels on the

THS4522 and THS4524 using the crosstalk meter

function of the AP audio analyzer.

Figure 68. THS4521 AP Analyzer Test Circuit

Figure 70. THS4521 1-VRMS 10-kHz FFT Plot

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Product Folder Link(s): THS4521 THS4522 THS4524

THS4521 Datasheet(PDF) 29 Page - Texas Instruments

THS4521 Datasheet(HTML) 29 Page - Texas Instruments

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