AD9708
–6–
rev. b
典型 交流 描绘 曲线
频率 – mhz
sinad/thd – db
70
60
40
0.1 1 100
10
50
65
55
45
thd @ 10msps
thd @ 50msps
THD
@ 100msps
sinad @ 10msps
sinad @ 100msps
sinad @ 50msps
图示 3. sinad/thd vs. f
输出
(avdd
和 dvdd = 5.0 v)
频率 – mhz
sinad/thd – db
70
60
40
0.1 1 100
10
50
65
55
45
thd @ 10msps
thd @ 50msps
THD
@ 100msps
sinad @ 10msps
sinad @ 100msps
sinad @ 50msps
图示 6. sinad/thd vs. f
输出
(avdd
和 dvdd = 3.0 v)
f
时钟
= 25msps
f
输出
= 7.81mhz
sfdr = +60.7dbc
振幅 = 0dbfs
0
–100
开始: 0hz 停止: 12.5mhz
10db – div
图示 9. 单独的-声调 谱的 plot
@ 25 msps
频率 – mhz
sinad/thd – db
70
60
40
0.1 1 100
10
50
65
55
45
thd @ 10msps
thd @ 50msps
THD
@ 100msps
sinad @ 10msps
sinad @ 100msps
sinad @ 50msps
图示 4. sinad/thd vs. f
输出
(differ-
ential 输出, avdd 和dvdd = 5.0 v)
频率 – mhz
sinad/thd – db
70
60
40
0.1 1 100
10
50
65
55
45
THD
@ 10msps
THD
@ 50msps
thd @ 100msps
sinad @ 10msps
sinad @ 100msps
sinad @ 50msps
图示 7. sinad/thd vs. f
输出
(differ-
ential 输出, avdd 和dvdd = 3.0 v)
f
时钟
= 125msps
f
输出
= 27.0mhz
sfdr = +52.7dbc
振幅 = 0dbc
0
开始: 0hz 停止: 62.5mhz
–100
10db – div
图示 10. 单独的-声调 谱的
plot @ 125 msps
频率 – mhz
sinad – db
55
50
30
1 100
10
40
45
35
I
OUTFS
= 20ma
I
OUTFS
= 10ma
I
OUTFS
= 5ma
I
OUTFS
= 2.5ma
图示 5. sinad vs. i
OUTFS
@ 100 msps
频率 – mhz
sinad – db
52
50
42
0.1 10
1
46
48
44
I
OUTFS
= 20ma
I
OUTFS
= 5ma
I
OUTFS
= 2.5ma
I
OUTFS
= 10ma
图示 8. Sinad vs. i
OUTFS
@ 20 msps
时间 – 5ns/div
伏特
0.5
0.4
0.3
0.2
0.1
0.0
–0.1
0.6
–0.2
图示 11. 步伐 回馈
(avdd = +5 v 或者 +3 v,dvdd = +5 v 或者 +3 v, 50
doubly terminated 加载,
单独的-结束 输出, i
OUTA
, i
OUTFS
= 20 毫安, t
一个
= +25
c, 除非 否则 指出)
: 点此下载
