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TYPICALCHARACTERISTICSADS7868
−90
−80
−70
−60
−50
−40
−30
−20
−10
0
0 5
10 15
20 25 30 35 40 45 50
Normalized振幅 − db
V
DD
= 1.2 v,
f
样本
= 100 ksps,
f
i
= 30 khz,
snr = 48.669 db,
sinad = 48.605 db,
thd (9) = −66.910 db,
sfdr = 67.041 db
f
i
− 输入 频率 − khz
−90
−80
−70
−60
−50
−40
−30
−20
−10
0
0 10 20 30 40 50 60 70 80 90 100
Normalized振幅 − db
V
DD
= 1.6 v,
f
样本
= 200 ksps,
f
i
= 30 khz,
snr = 49.420 db,
sinad = 49.413 db,
thd (9) = −77.085 db,
sfdr = 67.893 db
f
i
− 输入 频率 − khz
150
175
200
225
250
275
300
1.2 1.4 1.6 1.8
V
DD
− 供应 voltage − v
throughput 比率 − ksps
8-位 nmc, t
一个
= 25
°
c,
t
样本
= 2.375/f
SCLK
,
t
dis(eoc-sdoz)
+t
su(lsbz-csf)
= 0.375/f
SCLK
,
throughput 比率 = 12 sclk 循环
300
325
350
375
400
425
450
475
500
525
550
575
1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6
V
DD
− 供应 voltage − v
throughput 比率 − ksps
8-位 nmc, t
一个
= 25
°
c,
t
样本
= 2.25/f
SCLK
,
t
dis(eoc-sdoz)
+t
su(lsbz-csf)
= 0.25/f
SCLK
,
throughput 比率 = 12 sclk 循环
ADS7866
ADS7867
ADS7868
SLAS465–JUNE2005
fft(8192points)
figure23.
fft(8192points)
figure24.
THROUGHPUTRATETHROUGHPUTRATE
vsvs
SUPPLYVOLTAGESUPPLYVOLTAGE
figure25.figure26.
16
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