AD7722AS datasheet(11/24 Pages) AD

11 / 24 page

(AVDD = DVDD = 5.0 V, TA = +25 C; CLKIN = 12.5 MHz, AIN = 20 kHz, Bipolar Mode; VIN(+) = 0 V to 2.5 V, VIN(–) = 1.25 V unless otherwise noted)

Typical Characteristics–AD7722

INPUT LEVEL – dB

110

100

–40

–30

–20

–10

SFDR

S/ (N+D)

Figure 9. S/(N+D) and SFDR vs.

Analog Input Level

INPUT FREQUENCY – kHz

–85

–90

–115

100

–95

–100

–105

–110

THD

SNR

SFDR

VIN (+) = VIN(–) = 1.25Vpk–pk

VCM = 2.5V

Figure 12. SNR, THD, and SFDR vs.

Input Frequency

TEMPERATURE –

°C

–94

–116

–50

–25

100

025

–96

–108

–110

–112

–114

–100

–102

–106

–104

–98

THD

3RD

4TH

2ND

Figure 15. THD vs. Temperature

–11–

REV. 0

OUTPUT DATA RATE – kSPS

300

100

150

200

250

AIN = 1/5

· BW

Figure 10. S/(N+D) vs. Output

Sample Rate

OUTPUT DATA RATE – kSPS

300

100

150

200

250

AIN = 1/5

· BW

VIN (+) = VIN(–) = 1.25Vpk–pk

VCM = 2.5V

Figure 13. S/(N+D) vs. Output

Sample Rate

CODES

5000

n–3

n–2

n+3

n–1

n+1

n+2

4500

2000

1500

1000

500

4000

3500

2500

3000

VIN(+) = VIN(–)

CLKIN = 12.5MHz

8k SAMPLES

Figure 16. Histogram of Output

Codes with DC Input

INPUT FREQUENCY – kHz

–85

–90

–115

100

–95

–100

–105

–110

SNR

SFDR

THD

Figure 11. SNR, THD, and SFDR vs.

Input Frequency

TEMPERATURE –

°C

92.0

91.5

88.0

–50

100

90.0

89.5

88.5

89.0

91.0

90.5

Figure 14. SNR vs. Temperature

CODE

1.0

0.8

–1.0

20000

65535

40000

–0.4

–0.8

–0.6

–0.2

0.6

0.2

0.4

Figure 17. Differential Nonlinearity

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