AD6644ST datasheet(9/19 Pages) AD

Part #	AD6644ST

Description	14-Bit, 40 MSPS/65 MSPS A/D Converter

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Manufacturer	AD [Analog Devices]

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AD6644

–9–

REV. 0

Typical Performance Characteristics–

FREQUENCY – MHz

0

–120

0

5

101520

–130

25

30

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

ENCODE = 65MSPS

AIN = 2.2MHz @ –1dBFS

SNR = 74.5dB

SFDR = 92dBc

Figure 8. Single Tone at 2.2 MHz

FREQUENCY – MHz

0

–120

0

5

101520

–130

25

30

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

ENCODE = 65MSPS

AIN = 15.5MHz @ –1dBFS

SNR = 74dB

SFDR = 90dBc

Figure 9. Single Tone at 15.5 MHz

FREQUENCY – MHz

0

–120

0

5

101520

–130

25

30

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

ENCODE = 65MSPS

AIN = 30MHz @ –1dBFS

SNR = 73.5dB

SFDR = 85dBc

Figure 10. Single Tone at 30 MHz

FREQUENCY – MHz

0

30

5

10

152025

74.5

73.5

72.5

72.0

74.0

T = –25 C

T =

25 C

73.0

75.0

ENCODE = 65MSPS, AIN = –1dBFS

TEMP = –25 C,

25 C,

85 C

T =

85 C

Figure 11. Noise vs. Analog Frequency (Nyquist)

ANALOG INPUT FREQUENCY – MHz

0

30

510

15

20

25

92

86

82

80

90

T =

25 C

T =

25 C,

85 C

ENCODE = 65MSPS, AIN = –1dBFS

TEMP =

25 C,

85 C

84

88

94

Figure 12. Harmonics vs. Analog Frequency (Nyquist)

ANALOG FREQUENCY – MHz

0

100

10

20

50

70

80

74

71

69

68

73

70

72

75

30

40

60

90

AIN = –1dBFS

ENCODE = 65MSPS

PHASE NOISE OF ANALOG SOURCE

DEGRADES PERFORMANCE

LOW NOISE ANALOG SOURCE

Figure 13. Noise vs. Analog Frequency (IF)

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