THS4521 datasheet(30/43 Pages) TI

30 / 43 page

ADC Driver Performance:

100

120

140

160

24 26

Frequency(kHz)

1-kHzFFT

G=1

R =R =1k

C =1.5nF

V =5V

Load=2x49.9

+2.2nF

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-kHzFFT

G=1

R =R =1k

C =1.5nF

V =5V

Load=2x49.9

+2.2nF

THS4521

THS4522

THS4524

SBOS458B – DECEMBER 2008 – REVISED MAY 2009.................................................................................................................................................... www.ti.com

THS4521 and ADS1278 Combined

Performance

The THS4521 provides excellent performance when

driving

high-performance

delta-sigma

(

ΔΣ)

and

successive approximation register (SAR) ADCs in

audio and industrial applications using a single 3-V to

5-V power supply. To show 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 71 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

Figure 72. 1-kHz FFT

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

plots showing the spectral performance are given in

Figure 72 and Figure 73; tabulated ac analysis results

are shown in Table 4.

Figure 71. THS4521 and ADS1278 (Ch 1) Test

Circuit

Figure 73. 10-kHz FFT

Table 4. AC Analysis

Tone

Signal

SNR

THD

SINAD

SFDR

(Hz)

(dBFS)

(dBc)

1 k

–0.50

109.1

–107.9

105.5

113.7

10 k

–0.50

101.8

–109.8

101.1

109.8

Submit Documentation Feedback

Product Folder Link(s): THS4521 THS4522 THS4524

THS4521 датащи(PDF) 30 Page - Texas Instruments

THS4521 датащи(HTML) 30 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

датащи скачать

ссылки URL