AD8021 datasheet(10/28 Pages) AD

10 / 28 page

AD7685

Rev. C | Page 10 of 28

TYPICAL PERFORMANCE CHARACTERISTICS

CODE

65536

16384

32768

49152

2.0

1.5

1.0

0.5

–0.5

–1.0

–1.5

–2.0

POSITIVE INL = +0.33LSB

NEGATIVE INL = –0.50LSB

Figure 7. Integral Nonlinearity vs. Code

CODE IN HEX

80EA 80EB 80EC 80ED

80E5 80E6 80E7 80E8 80E9

250000

200000

150000

100000

50000

204292

27755

29041

VDD = REF = 5V

Figure 8. Histogram of a DC Input at the Code Center

FREQUENCY (kHz)

120

20406080

100

–20

–40

–60

–80

–100

–120

–160

–140

–180

8192 POINT FFT

VDD = REF = 5V

fS = 250kSPS

fIN = 20.45kHz

SNR = 93.3dB

THD = –111.6dB

SFDR = –113.7dB

SECOND HARMONIC = –113.7dB

THIRD HARMONIC = –117.6dB

Figure 9. FFT Plot

CODE

65536

16384

32768

49152

2.0

1.5

1.0

0.5

–0.5

–1.0

–1.5

–2.0

POSITIVE DNL = +0.21LSB

NEGATIVE DNL = –0.30LSB

Figure 10. Differential Nonlinearity vs. Code

CODE IN HEX

8058

804E 804F 8050 8051 8052 8053 8054 8055 8056 8057

140000

120000

100000

80000

60000

40000

20000

213

6956

179

60966

125055

8667

59082

VDD = REF = 2.5V

Figure 11. Histogram of a DC Input at the Code Center

FREQUENCY (kHz)

120

204060

100

–20

–40

–60

–80

–100

–120

–140

–160

–180

16384 POINT FFT

VDD = REF = 2.5V

fS = 250kSPS

fIN = 20.45kHz

SNR = 88.8dB

THD = –103.5dB

SFDR = –104.5dB

SECOND HARMONIC = –112.4dB

THIRD HARMONIC = –105.4dB

Figure 12. FFT Plot

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