AD9255 Analog Devices, AD9255 Datasheet - Page 20

• Manufacturer Part Number: AD9255
• Description: 14-Bit, 125 MSPS/105 MSPS/80 MSPS, 1.8 V Analog-to-Digital Converter
• Manufacturer: Analog Devices

Specifications of AD9255

• Resolution (bits): 14bit
• # Chan: 1
• Sample Rate: 125MSPS
• Interface: LVDS,Par,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p,1 V p-p,2 V p-p
• Adc Architecture: Pipelined
• Pkg Type: CSP

AD9255
Figure 37. AD9255-125 Single-Tone FFT with f
Figure 38. AD9255-125 Single-Tone FFT with f
Figure 36. AD9255-125 Single-Tone FFT with f
–100
–120
–140
–105
–120
–135
–105
–120
–135
–20
–40
–60
–80
–15
–30
–45
–60
–75
–90
–15
–30
–45
–60
–75
–90
0
0
0
0
+
125MSPS
70.1MHz @ –6dBFS
SNR = 72.6dB (78.6dBFS)
SFDR = 99.7dBc
125MSPS
70.1MHz @ –23dBFS
SNR = 56.4dBc (79.4dBFS)
SFDR = 75.8dBc
125MSPS
70.1MHz @ –23dBFS
SNR = 55.9dBc (78.9dBFS)
SFDR = 86.6dBc
6
6
HARMONIC
+
SECOND
10
12
12
Dither Disabled, 1M Sample
Dither Enabled, 1M Sample
2
2
18
18
20
Dither Enabled
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
24
24
5
5
HARMONIC
30
30
30
4
4
THIRD
36
36
IN
IN
IN
40
= 70.1 MHz @ −23 dBFS with
= 70.1 MHz @ −23 dBFS with
3
= 70.1 MHz @ −6 dBFS with
3
42
42
6
6
48
48
50
54
54
60
60
60
Rev. A | Page 20 of 44
Figure 39. AD9255-125 Single-Tone SNR/SFDR vs. Input Amplitude (A
Figure 40. AD9255-125 Single-Tone SNR/SFDR vs. Input Amplitude (A
Figure 41. AD9255-125 Single-Tone SNR/SFDR vs. Input Amplitude (A
120
100
120
100
120
110
100
80
60
40
20
80
60
40
20
90
80
70
–100
–100
–100
0
0
f
IN
–90
–90
–90
= 30 MHz With and Without Dither Enabled
SNR (dBFS)
SNR (dBFS)
–80
–80
–80
SFDR (dBc)
SFDR (dBc)
–70
–70
–70
INPUT AMPLITUDE (dBFS)
INPUT AMPLITUDE (dBFS)
INPUT AMPLITUDE (dBFS)
SNRFS (DITHER OFF)
f
SNRFS (DITHER ON)
IN
f
IN
–60
–60
= 98.12 MHz
–60
= 2.4 MHz
SFDRFS (DITHER OFF)
SFDR (dBFS)
SFDR (dBFS)
–50
–50
–50
SNR (dBc)
SNR (dBc)
–40
–40
–40
SFDRFS (DITHER ON)
–30
–30
–30
–20
–20
–20
–10
–10
–10
0
0
0
IN
IN
IN
) with
) with
) with