AD6644 Analog Devices, AD6644 Datasheet - Page 9

• Manufacturer Part Number: AD6644
• Description: 14-Bit, 40 MSPS/65 MSPS Analog-to-Digital Converter
• Manufacturer: Analog Devices

Specifications of AD6644

• Resolution (bits): 14bit
• # Chan: 1
• Sample Rate: 65MSPS
• Interface: Par
• Analog Input Type: Diff-Uni
• Ain Range: 2.2 V p-p
• Adc Architecture: Pipelined
• Pkg Type: QFP

TYPICAL PERFORMANCE CHARACTERISTICS
–100
–110
–120
–130
–100
–110
–120
–130
–100
–110
–120
–130
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
0
0
0
0
0
ENCODE = 65MSPS
AIN = 2.2MHz @ –1dBFS
SNR = 74.5dB
SFDR = 92dBc
ENCODE = 65MSPS
AIN = 30MHz @ –1dBFS
SNR = 73.5dB
SFDR = 85dBc
5
5
5
Figure 5. Single Tone at 15.5 MHz
Figure 4. Single Tone at 2.2. MHz
Figure 6. Single Tone at 30 MHz
10
10
10
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
15
15
15
ENCODE = 65MSPS
AIN = 15.5MHz @ –1dBFS
SNR = 74dB
SFDR = 90dBc
20
20
20
25
25
25
30
30
30
Rev. D | Page 9 of 24
75.0
74.5
74.0
73.5
73.0
72.5
72.0
75
74
73
72
71
70
69
68
94
92
90
88
86
84
82
80
0
0
0
Figure 8. Harmonics vs. Analog Frequency (Nyquist)
Figure 7. Noise vs. Analog Frequency (Nyquist)
10
PHASE NOISE OF ANALOG SOURCE
DEGRADES PERFORMANCE
Figure 9. Noise vs. Analog Frequency (IF)
T = –25°C, +85°C
5
5
20
ANALOG INPUT FREQUENCY (MHz)
T = +85°C
ANALOG FREQUENCY (MHz)
30
10
10
FREQUENCY (MHz)
ENCODE = 65MSPS, AIN = –1dBFS
TEMP = –25°C, +25°C, +85°C
40
LOW NOISE ANALOG SOURCE
ENCODE = 65MSPS, AIN = –1dBFS
TEMP = –25°C, +25°C, +85°C
50
15
15
T = +25°C
60
AIN = –1dBFS
ENCODE = 65MSPS
20
20
70
80
T = +25°C
T = –25°C
25
25
90
AD6644
100
30
30