THS4522IPW datasheet(47/71 Pages) TI2

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THS4521

ADS1278 (CH1)

OCM

COM

2.2nF

AINN1

AINP1

1/2

OPA2350

1.5nF

IN+

IN-

1kW

49.9 W

0.1 F

1kW

THS4521, THS4522, THS4524

www.ti.com

SBOS458H – DECEMBER 2008 – REVISED JUNE 2015

9.2.2 ADC Driver Performance: THS4521 and ADS1278 Combined Performance

The THS4521 provides excellent performance when driving high-performance

ΔΣ and successive approximation

achievable performance, the THS4521 is tested as the drive amplifier for the ADS1278 24-bit ADC. The

ADS1278 offers excellent ac and DC performance, with four selectable operating

modes from 10 kSPS to 128 kSPS to enable the user to fine-tune performance and power for specific application

needs. The circuit shown in Figure 85 was used to test the performance. Data were taken using the High-

Resolution mode (52 kSPS) of the ADS1278 with input frequencies at 1 kHz and 10 kHz and signal levels 1/2 dB

below full-scale (–0.5 dBFS). FFT plots showing the spectral performance are given in Figure 87 and Figure 88;

tabulated ac analysis results are shown in Table 11 and compared to the ADS1278 data sheet typical

performance specifications.

Figure 85. THS4521 and ADS1278 (Ch 1) Test Circuit

9.2.2.1 Design Requirements

Table 11. AC Analysis

Configuration

Tone

Signal (dBFS)

SNR (dBc)

THD (dBc)

SINAD (dBc)

SFDR (dBc)

THS4521 and

1 kHz

–0.5

109

–108

105

114

ADS1278

10 kHz

–0.5

102

–110

101

110

ADS1278 Data

1 kHz

–0.5

110

–108

—

109

sheet (typ)

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