OPA830 datasheet(39/66 Pages) TI2

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9.2.1.3 Application Curves

Figure 9-12 shows the THD+N performance with 100-kΩ and 300-Ω loads, and with A-weighting and with no

weighting. Both loads show similar performance. With no weighting, the THD+N performance is dominated by

the noise for both loads. A-weighting provides filtering that improves the noise, revealing the increased distortion

with RL = 300 Ω.

Figure 9-13 and Figure 9-14 show the FFT output with a 1-kHz tone and 100-kΩ and 300-Ω loads. To show

relative performance of the device versus the test set, one channel has the OPA836 device in-line between the

generator output and the analyzer. The other channel is in “Gen Mon” loopback mode, which internally connects

the signal generator to the analyzer input. With 100-kΩ load, Figure 9-13, the curves are indistinguishable from

each other except for noise, which means the OPA836 device cannot be directly measured. With 300-Ω load, as

shown in Figure 9-14, the main difference between the curves is that the OPA836 device shows slightly higher

even-order harmonics, but the performance of the test set masks the odd-order harmonics.

100

10k

100k

f - Frequency - Hz

No weighting

R = 300

R = 100 k

-120

-115

-110

-105

-100

-95

-90

V = 5 V,

= 1 V

G = 1,

R = 0

BW = 80 kHz

OUT

RMS

A-weighting

R = 300

R = 100 k

Figure 9-12. OPA836 1 VRMS 20-Hz to 80-kHz

THD+N

10k

12k

16k

18k

20k

f - Frequency - Hz

-140

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

R = 100k

Gen Mon - 100k

V = 5 V,

= 1 V

G = 1,

R = 0

OUT

RMS

Figure 9-13. OPA836 and AP Gen Mon 10-kHz FFT

Plot; VOUT = 1 VRMS, RL = 100 kΩ

-140

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

10k

12k

16k

18k

20k

f - Frequency - Hz

V = 5 V,

= 1 V

G = 1,

R = 0

OUT

RMS

R = 300

Gen Mon - 300

Figure 9-14. OPA836 and AP Gen Mon 10-kHz FFT Plot; VOUT = 1 VRMS, RL = 300 Ω

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OPA836, OPA2836

SLOS712J – JANUARY 2011 – REVISED MARCH 2021

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OPA830 Datasheet(PDF) 39 Page - Texas Instruments

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