9.2.2.1.1 Measurement Results

The THP210 and the filter combination listed in Section 9.2.2.1 allow for the best trade-off between harmonic

distortion and maintaining stability of the FDA. Table 9-1 and Figure 9-13 through Figure 9-15 showcase the

device performance.

Table 9-1. THP210 + ADS891x: FFT Data Summary

ADC VERSION

ADC SPECIFICATION

SAMPLING RATE

SNR

THD(1)

SINAD

ADS8910B

1-MSPS max, 18 bit

800 kSPS

100.37 dB

–118.4 dB

100.31 dB

ADS8912B

500 kSPS, 18 bit

500 kSPS

100.4 dB

–118.44 dB

100.33 dB

ADS8914B

250 kSPS, 18 bit

250 kSPS

100.37 dB

–118.72 dB

100.33 dB

(1)

THD can further be improved by providing a bipolar power supply for more headroom for the negative voltage swing. In the given

circuit, a negative supply of VS– = 0.23 V improved the THD to –120.5 dB.

Frequency (Hz)

0

100000

200000

300000

400000

-200

-175

-150

-125

-100

-75

-50

-25

0

fIN = 2 kHz, 100.37 dB SNR, –118.4 dB THD

Figure 9-13. Noise Performance FFT Plot:

THP210 + ADS8910B, 800 kSPS, 18-Bit

Frequency (Hz)

0

50000

100000

150000

200000

250000

-200

-180

-160

-140

-120

-100

-80

-60

-40

-20

0

fIN = 2 kHz, 100.4 dB SNR, –118.44 dB THD

Figure 9-14. Noise Performance FFT Plot:

THP210 + ADS8912B, 500 kSPS, 18-Bit

Frequency (Hz)

0

25000

50000

75000

100000

125000

-200

-150

-100

-50

0

fIN = 2 kHz, 100.37 dB SNR, –118.72 dB THD

Figure 9-15. Noise Performance FFT Plot:

THP210 + ADS8914B, 250 kSPS, 18-Bit

THP210

SBOS932C – JANUARY 2020 – REVISED MARCH 2021

www.ti.com

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