THS4521 datasheet(34/48 Pages) TI

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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

100

120

140

160

24 26

Frequency (kHz)

10-kHz FFT

G = 1

R = R = 1 k

C = 1.5 nF

V = 5 V

Load = 2 x 49.9

+ 2.2 nF

100

120

140

160

24 26

Frequency (kHz)

1-kHz FFT

G = 1

R = R = 1 k

C = 1.5 nF

V = 5 V

Load = 2 x 49.9

+ 2.2 nF

THS4521

THS4522

THS4524

SBOS458D – DECEMBER 2008 – REVISED AUGUST 2010

www.ti.com

ADC Driver Performance:

modes from 10 kSPS to 128 kSPS to enable the user

THS4521 and ADS1278 Combined

to fine-tune performance and power for specific

Performance

application needs. The circuit shown in Figure 81 was

used to test the performance. Data were taken using

The THS4521 provides excellent performance when

the High-Resolution mode (52 kSPS) of the ADS1278

driving

high-performance

ΔΣ

and

successive

with input frequencies at 1 kHz and 10 kHz and

approximation register (SAR) ADCs in audio and

signal levels 1/2 dB below full-scale (–0.5 dBFS). FFT

industrial applications using a single 3-V to 5-V power

plots showing the spectral performance are given in

supply.

show

achievable

performance,

the

Figure 82 and Figure 83; tabulated ac analysis results

THS4521 is tested as the drive amplifier for the

are shown in Table 6 and compared to the ADS1278

ADS1278 24-bit ADC. The ADS1278 offers excellent

data sheet typical performance specifications.

ac and dc performance, with four selectable operating

Figure 81. THS4521 and ADS1278 (Ch 1) Test Circuit

Figure 82. 1-kHz FFT

Figure 83. 10-kHz FFT

Table 6. AC Analysis

Configuration

Tone

Signal (dBFS)

SNR (dBc)

THD (dBc)

SINAD (dBc)

SFDR (dBc)

THS4521and

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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