THS4522IPW datasheet(48/71 Pages) TI2

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THS4521

ADS8321

OCM

1nF

-IN

+IN

IN+

IN-

1kW

49.9 W

0.22 F

68pF

1kW

Open

THS4521, THS4522, THS4524

SBOS458H – DECEMBER 2008 – REVISED JUNE 2015

www.ti.com

9.2.2.2 Detailed Design Procedure

9.2.2.2.1

ADC Driver Performance: THS4521 and ADS8321 Combined Performance

To demonstrate achievable performance, the THS4521 is tested as the drive amplifier for the ADS8321 16-bit

SAR ADC. The ADS8321 offers excellent ac and dc performance, with ultra-low power and small size. The circuit

shown in Figure 86 was used to test the performance.

Data were taken using the ADS8321 at 100 kSPS with input frequencies of 2 kHz and 10 kHz and signal levels

that were -0.5 dBFS. FFT plots that illustrate the spectral performance are given in Figure 89 and Figure 90.

Tabulated ac analysis results are listed in Table 12 and compared to the ADS8321 data sheet typical

performance. Note the significant improvement in SFD using the THS4521 driver over just the ADC by itself.

Figure 86. THS4521 and ADS8321 Test Circuit

Table 12. AC Analysis

Configuration

Tone

Signal (dBFS)

SNR (dBc)

THD (dBc)

SINAD (dBc)

SFDR (dBc)

THS4521 and

2 kHz

–0.5

86.7

–97.8

86.4

100.7

ADS8321

10 kHz

–0.5

85.2

–98.1

85.2

102.2

ADS8321 Data

10 kHz

–0.5

–86

sheet (typ)

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