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參數資料
| 型號： | AD9200JST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Complete 10-Bit, 20 MSPS, 80 mW CMOS A/D Converter |
| 中文描述： | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | PLASTIC, LQFP-48 |
| 文件頁數： | 17/24頁 |
| 文件大小： | 338K |
| 代理商： | AD9200JST |
AD9200
–17–
REV. E
Figures 35–38 combine the dual-tone SFDR as well as single
tone SFDR and SNR performance at IF frequencies of 45 MHz,
70 MHz, 85 MHz and 135 MHz. Note, the SFDR vs. ampli-
tude data is referenced to dBFS while the single tone SNR data
is referenced to dBc. The performance characteristics in these
figures are representative of the AD9200 without the AD8009.
The AD9200 was operated in the differential mode (via trans-
former) with a 1 V span at 20 MSPS. The analog supply
(AVDD) and the digital supply (DRVDD) were set to +5 V and
3.3 V, respectively.
90
80
0
–60
0
–40
–20
70
60
30
20
INPUT POWER LEVEL – dBFS
50
40
10
–10
–50
–30
W
S
SINGLE TONE SFDR
DUAL TONE SFDR
SNR
CLK = 20MSPS
SINGLE TONE – 45.52MHz
DUAL TONE– F
1
= 44.49MHz
– F
2
= 45.52MHz
Figure 35. SNR/SFDR for IF @ 45 MHz
90
80
0
–60
0
–40
–20
70
60
30
20
INPUT POWER LEVEL – dBFS
50
40
10
–10
–50
–30
W
S
SINGLE TONE SFDR
DUAL TONE SFDR
SNR
CLK = 21.538MSPS
SINGLE TONE – 70.55MHz
DUAL TONE– F
1
= 69.50MHz
– F
2
= 70.55MHz
Figure 36. SNR/SFDR for IF @ 70 MHz
Although not presented, data was also taken with the insertion
of an AD8009 gain stage of 32 dB in the signal path. No
degradation in two-tone SFDR vs. amplitude was noted at an
IF of 45 MHz, 70 MHz and 85 MHz. However, at 135 MHz,
the AD8009 became the limiting factor in the distortion perfor-
mance until the two input tones were decreased to –15dBFS
from their full-scale level of –6.5 dBFS. Note: the SNR perfor-
mance in each case degraded by approximately 0.5 dB due to
the AD8009’s in-band noise contribution.
90
80
0
0
–40
–20
70
60
30
20
INPUT POWER LEVEL – dBFS
50
40
10
–10
–50
–30
W
S
SINGLE TONE SFDR
DUAL TONE SFDR
SNR
CLK = 20MSPS
SINGLE TONE – 85.52MHz
DUAL TONE– F
1
= 84.49MHz
– F
2
= 85.52MHz
Figure 37. SNR/SFDR for IF @ 85 MHz
W
S
90
80
060
0
–40
–20
70
60
30
20
INPUT POWER LEVEL – dBFS
50
40
10
–10
–50
–30
SINGLE TONE SFDR
DUAL TONE SFDR
SNR
CLK = 20MSPS
SINGLE TONE – 135.52MHz
DUAL TONE – F
1
= 134.44MHz
– F
2
= 135.52MHz
Figure 38. SNR/SFDR for IF @ 135 MHz
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