Data Sheet

AD7694

TYPICAL PERFORMANCE CHARACTERISTICS

4

–4

–3

–2

–1

0

1

2

3

0

32768

16384

49152

65536

CODE

POSITIVE INL = +0.68 LSB

NEGATIVE INL = –1.14 LSB

Figure 5. Integral Nonlinearity vs. Code

12000

10000

8000

6000

4000

2000

0

24E0

24E1

24E2

24E3

24E4

24E5

24E6

24E7

24E8

CODE IN HEX

0

0

1

0

0

12500

10003

0

108568

VDD = REF = 5V

Figure 6. Histogram of a DC Input at the Code Center

0

–180

–160

–140

–120

–100

–80

–60

–40

–20

0

20

40

60

80

100

120

FREQUENCY (kHz)

16384 POINT FFT

VDD = REF = 5V

SNR = 92.5dB

THD = –109.9dB

SFDR = –111.0dB

Figure 7. FFT Plot

2.0

–2.0

–1.5

–1.0

–0.5

0

0.5

1.0

1.5

0

32768

16384

49152

65536

CODE

POSITIVE DNL = +0.59 LSB

NEGATIVE DNL = –0.56 LSB

Figure 8. Differential Nonlinearity vs. Code

8000

7000

6000

5000

4000

3000

2000

1000

0

251B 251C 251D 251E 251F 2520 2521 2522 2523 2524 2525 2526

CODE IN HEX

VDD = REF = 2.5V

0

0

27

2808

50

1

0

0

28148

65487

2133

32418

Figure 9. Histogram of a DC Input at the Code Center

0

–180

–160

–140

–120

–100

–80

–60

–40

–20

0

10

20

30

40

50

60

70

FREQUENCY (kHz)

16384 POINT FFT

VDD = REF = 2.5V

SNR = 88.5dB

THD = –102.7dB

SFDR = –105.1dB

Figure 10. FFT Plot

Rev. B | Page 9 of 16