THS4521 datasheet(37/58 Pages) TI2

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−115

−113

−111

−109

−107

−105

−103

−101

−99

−97

−95

100

10k

20k

Frequency (Hz)

G075

2 kΩ

0.22 μF

THS4531

VOUT+

40.2 Ω

VOUT–

40.2 Ω

From Analyzer

VIN+

VIN–

–

VOCM

100 pF

2 kΩ

1 nF

100 pF

2.7 nF

2 kΩ

To Analyzer

PCM4204

THS4531

www.ti.com

SLOS358C – SEPTEMBER 2011 – REVISED APRIL 2020

Product Folder Links: THS4531

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Audio ADC Driver Performance: THS4531 AND PCM4204 Combined Performance (continued)

Figure 86. THS4531 and PCM4204 Test Circuit

An audio analyzer is used to provide an analog audio input to the EVM and the PCM formatted digital output is

read by the digital input on the analyzer. Data was taken at fS = 96 kHz, and audio output uses PCM format.

Other data rates and formats are expected to show similar performance in line with that shown in the data sheet.

Figure 87 shows the THD+N vs Frequency with no weighting and Figure 88 shows an FFT with 1 kHz input tone.

Input signal to the PCM4204 for these tests is -0.5 dBFS. Table 6 summarizes results of testing using the

THS4531 + PCM4204 versus typical Data Sheet performance, and show it make an excellent drive amplifier for

this ADC.

Figure 87. THS4531 + PCM4204 THD+N vs Frequency with No Weighting

THS4521 Datasheet(PDF) 37 Page - Texas Instruments

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