REF5020-EP, REF5025-EP, REF5040-EP, REF5050-EP

SBOS471B – APRIL 2010 – REVISED JUNE 2015

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System Example (continued)

Table 3. Data Acquisition Measurement Results for Different Conditions

OPA365

124

Ω, 1 nF

124

Ω, 1 nF

124

Ω, 100 µF

REF5040

10 µF

10 µF + 47 µF

10 µF + 47 µF

UNIT

TRIM

0 µF

1 µF

1 µF

Resolution

16

16

16

Bits

States

65536

65536

65536

4.096

4.096

4.096

V

LSB

62.5

62.5

62.5

µV

4.02

4.02

4.02

V

Data Std

1.07

0.53

0.41

LSB

Noise

67.0

33.4

25.8

Noise

442.3

220.5

170.2

SNR

86.7

92.8

95.0

dB

FTT Points

32768

32768

32768

Noise Flor

–128.8

–134.9

–131.7

dB

Once the correct components for data acquisition system from Figure 33 are selected, measurement results can

be compared to the ADS8326 data sheet specifications.

Table 4. AC Performance for Data Acquisition System from Figure 33

ADS8326

ADS8326B

SYSTEM

SYSTEM

REF5040

DATA SHEET

DATA SHEET

LOW ESR

10 µF + 47 µF

UNIT

TRIM

1µF

SNR

91

91.5

90.6

92.2

dB

SINAD

87.5

88

85.7

89.5

dB

SFDR

94

95

88.3

98.4

dB

THD

–90

–91

–87.3

–92.9

dB

ENOB

14.28

14.35

13.94

14.58

Bits

Table 3 shows improvements on the FFT for a properly designed system.

18

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