THS4521 datasheet(33/58 Pages) TI2

33 / 58 page

−21

−18

−15

−12

−9

−6

−3

100k

10M

100M

Frequency (Hz)

CL = 0 pF, RO = 0 Ω

CL = 15 pF, RO = 200 Ω

CL = 39 pF, RO = 100 Ω

CL = 120 pF, RO = 50 Ω

CL = 470 pF, RO = 20 Ω

CL = 1200 pF, RO = 12 Ω

VS = 2.7 V

G = 1 V/V

RF = 2 k

Ω

RL = 2 k

Ω

VOUT = 100 mVpp

G069

100

200

100

CLOAD (pF)

VS = 2.7 V

G = 1 V/V

RF = 2 k

Ω

RL = 2 k

Ω

G068

THS4531

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SLOS358C – SEPTEMBER 2011 – REVISED APRIL 2020

Product Folder Links: THS4531

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Application Circuits (continued)

Figure 78. Recommended Series Output Resistor vs Capacitive Load for Flat Frequency Response

Figure 79. Frequency Response for Various RO and CL Values

9.2.9 Audio Performance

The THS4531 provides excellent audio performance with very low quiescent power. To show performance in the

audio band, the device was tested with an audio analyzer. THD+N and FFT tests were run at 1 Vrms output

voltage. Performance is the same on both 2.7 V and 5 V supply. Figure 80 is the test circuit used, and Figure 81

and Figure 82 show performance of the analyzer. In the FFT plot the harmonic spurs are at the testing limit of the

analyzer, which means the THS4531 is actually much better than can be directly measured. Because the

THS4531 distortion performance cannot be directly measured in the audio band it is estimated from

measurement in high noise gain configuration correlated with simulation.

THS4521 Datasheet(PDF) 33 Page - Texas Instruments

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