THS4524MDBTREP datasheet(36/48 Pages) NSC

36 / 48 page

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

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

THS4524

ADS1278 (CH 1)

OCM

5 V

COM

2.2 nF

AINN1

AINP1

1/2

OPA2350

1.5 nF

IN+

IN-

1 kW

49.9 W

0.1 mF

1 kW

THS4524-EP

SBOS609A – JUNE 2012 – REVISED AUGUST 2013

www.ti.com

ADC Driver Performance:

modes from 10 kSPS to 128 kSPS to enable the user

THS4524 and ADS1278 Combined

to fine-tune performance and power for specific

Performance

application needs. The circuit shown in Figure 82 was

The THS4524 provides excellent performance when

used to test the performance. Data were taken using

driving

high-performance

ΔΣ

and

successive

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

approximation register (SAR) ADCs in audio and

with input frequencies at 1 kHz and 10 kHz and

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

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

supply.

show

achievable

performance,

the

plots showing the spectral performance are given in

THS4524 is tested as the drive amplifier for the

Figure 83 and Figure 84; tabulated ac analysis results

ADS1278 24-bit ADC. The ADS1278 offers excellent

are shown in Table 6 and compared to the ADS1278

ac and dc performance, with four selectable operating

data sheet typical performance specifications.

Figure 82. THS4524 and ADS1278 (Ch 1) Test Circuit

Figure 83. 1-kHz FFT

Figure 84. 10-kHz FFT

Table 6. AC Analysis

Configuration

Tone

Signal (dBFS)

SNR (dBc)

THD (dBc)

SINAD (dBc)

SFDR (dBc)

THS4524 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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