ADAQ7980 datasheet(13/35 Pages) AD

13 / 35 page

Data Sheet

ADAQ4003

Rev. 0 | Page 13 of 35

–180

–160

–140

–120

–100

–80

–60

–40

–20

100

10k

FREQUENCY (Hz)

100k

VREF = 2.5V

SNR = 92.4dB

THD = –113.7dB

SINAD = 92.2dB

Figure 17. 1 kHz, −0.5 dBFS Input Tone FFT, Wide View, Differential,

G = 0.909, VREF = 2.5 V, Low Power Mode

14.95

15.15

15.35

15.55

15.75

15.95

16.15

2.5

3.0

3.5

4.0

4.5

5.0

REFERENCE VOLTAGE (V)

G = 0.909 SNR

G = 0.909 SINAD

G = 0.909 ENOB

G = 1.9 SNR

G = 1.9 SINAD

G = 1.9 ENOB

G = 0.454 SNR

G = 0.454 SINAD

G = 0.454 ENOB

Figure 18. SNR, SINAD, and Effective Number of Bits (ENOB) vs. Reference

Voltage for G = 0.454, G = 0.909, and G = 1.9, fIN = 1 kHz

15.80

15.85

15.90

15.95

16.00

16.05

16.10

16.15

97.0

97.2

97.4

97.6

97.8

98.0

98.2

98.4

98.6

98.8

99.0

–40

–20

100

120

TEMPERATURE (°C)

G = 1.9 SNR

G = 1.9 SINAD

G = 1.9 ENOB

G = 0.909 SNR

G = 0.909 SINAD

G = 0.909 ENOB

G = 0.454 SNR

G = 0.454 SINAD

G = 0.454 ENOB

Figure 19. SNR, SINAD, and ENOB vs. Temperature,

G =1.9, G = 0.909, and G = 0.454, fIN = 1 kHz

–20

–40

–60

–80

–100

–120

–140

–160

–180

100

10k

100k

FREQUENCY (Hz)

VREF = 5V

SNR = 88.3dB

THD = –87.6dB

SINAD = 85.7dB

Figure 20. 400 kHz, −0.5 dBFS Input Tone FFT, G = 1, Wide View, VREF = 5 V

100

FREQUENCY (Hz)

100k

10k

16.5

16.0

15.5

15.0

14.5

14.0

13.5

G = 1.9 SNR

G = 1.9 SINAD

G = 0.909 SNR

G = 0.909 SINAD

G = 1.9 ENOB

G = 0.909 ENOB

Figure 21. SNR, SINAD, and ENOB vs. Frequency for G = 1.9 and G = 0.909,

VREF = 5 V

–126

–124

–122

–120

–118

–116

–114

–112

2.5

3.0

3.5

4.0

4.5

5.0

REFERENCE VOLTAGE (V)

G = 0.454

G = 0.909

G = 1.9

Figure 22. THD vs. Reference Voltage, G = 0.454, G = 0.909, and G = 1.9,

fIN = 1 kHz

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