THS4532IPWR datasheet(32/44 Pages) TI

32 / 44 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 kΩ

RL = 2 kΩ

VOUT = 100 mVpp

G069

100

200

100

CLOAD (pF)

VS = 2.7 V

G = 1 V/V

RF = 2 kΩ

RL = 2 kΩ

G068

THS4532

SLOS829 – FEBRUARY 2013

www.ti.com

Figure 82. Recommended Series Output Resistor vs Capacitive Load for Flat Frequency Response

Figure 83. Frequency Response for Various RO and CL Values

Audio Performance

The THS4532 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 1Vrms output

voltage. Performance is the same on both 2.7V and 5V supply. Figure 84 is the test circuit used, and Figure 85

and Figure 86 show performance of the analyzer. In the FFT plot the harmonic spurs are at the testing limit of the

analyzer, which means the THS4532 is actually much better than can be directly measured. Because the

THS4532 distortion performance cannot be directly measured in the audio band it is estimated from

measurement in high noise gain configuration correlated with simulation.

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