AD7991 datasheet(14/28 Pages) AD

14 / 28 page

AD7991/AD7995/AD7999

Rev. 0 | Page 14 of 28

CODE

500

1000

1500

2000

2500

3000

3500

4000

–1.0

–0.8

–0.6

–0.4

–0.2

0.2

0.4

0.6

0.8

1.0

VDD = 5V

VREF = 2.5V

fSCL = 1.7MHz

Figure 10. DNL Error, VDD = 5 V, VREF = 2.5 V, fSCL = 1.7 MHz

Without Clock Stretching

800

VDD (V)

345

fSCL = 1.7MHz

+125°C

+85°C

+25°C

–40°C

600

400

200

Figure 11. IDD Supply Current vs. Supply Voltage, fSCL = 1.7 MHz

Without Clock Stretching, −40°C to +125°C

1000

VDD (V)

800

600

400

200

345

fSCL = 3.4MHz

+125°C

+85°C

+25°C

–40°C

Figure 12. IDD Supply Current vs. Supply Voltage, f SCL = 3.4 MHz

with Clock Stretching, −40°C to +125°C

–70

–100

100

INPUT FREQUENCY (kHz)

–80

–90

fSCL = 1.7MHz

VDD = 5V

VDD = 3V

Figure 13. THD vs. Input Frequency, VREF = 2.5 V, fSCL = 1.7 MHz

Without Clock Stretching

fNOISE (kHz)

VDD = 3V

VDD = 5V

VREF = VDD

fSCL = 1.7MHz

TEMPERATURE = TA

1020

3040

50607080

100

Figure 14. AD7991 Channel-to-Channel Isolation , fSCL = 1.7 MHz

Without Clock Stretching

–120

–100

–80

–60

–40

–20

468

FREQUENCY (kHz)

16384 POINT FFT

fS = 22.5kSPS

fSCL = 405kHz

fIN = 5.13kHz

SNR = 71.83dB

SINAD = 71.39dB

THD = –81.26dB

SFDR = –93.71dB

Figure 15. Dynamic Performance, fSCL = 405 kHz

Without Clock Stretching, VDD = 5 V, Full-Scale Input,

Seven-Term Blackman-Harris Window

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