Texas Instruments ADS868 Series, Руководство пользователя

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88
89
90
91
92
93
94
±
40
±
7
26 59 92 125
S
ign
a
l-
to
-Noise
Rat
io
(d
B
)
Free-Air Temperature (
o
C)
C036
-----
± 2.5*V
REF
----- ± 1.25*V
REF
----- ± 0.625*V
REF
------ +2.5*V
REF
------+1.25*V
REF
88
89
90
91
92
93
94
100 1000 10000
S
ign
a
l-
to
-Noise
+ Di
sto
rtio
n
Rat
io
(d
B
)
Input Frequency (Hz)
C037
-----
± 2.5*V
REF
----- ± 1.25*V
REF
----- ± 0.625*V
REF
------ +2.5*V
REF
------+1.25*V
REF
±
200
±
160
±
120
±
80
±
40
0
0 50000 100000 150000 200000 250000
A
m
p
litu
d
e
(
d
B
)
Input Frequency (Hz)
C034
87.5
88
88.5
89
89.5
90
90.5
91
91.5
92
92.5
100 1000 10000
S
ign
a
l-
to
-Noise
Rat
io
(d
B
)
Input Frequency (Hz)
C035
-----
± 2.5*V
REF
-----
± 1.25*V
REF
----- ± 0.625*V
REF
------ +2.5*V
REF
------+1.25*V
REF
±
200
±
160
±
120
±
80
±
40
0
0 50000 100000 150000 200000 250000
A
m
p
litu
d
e
(
d
B
)
Input Frequency (Hz)
C032
±
200
±
160
±
120
±
80
±
40
0
0 50000 100000 150000 200000 250000
A
m
p
litu
d
e
(
d
B
)
Input Frequency (Hz)
C033
ADS8684, ADS8688
www.ti.com SBAS582C – JULY 2014 – REVISED APRIL 2015
Typical Characteristics (continued)
At T
A
= 25°C, AVDD = 5 V, DVDD = 3 V, internal reference V
REF
= 4.096 V, and f
SAMPLE
= 500 kSPS, unless otherwise noted.
Number of points = 64k, f
IN
= 1 kHz, SNR = 89.6 dB, Number of points = 64k, f
IN
= 1 kHz, SNR = 90.93 dB,
SINAD = 89.5 dB, THD = 106 dB, SFDR = 107 dB SINAD = 90.48 dB, THD = 100 dB, SFDR = 102 dB
Figure 32. Typical FFT Plot (±0.625 × V
REF
) Figure 33. Typical FFT Plot (2.5 × V
REF
)
Number of points = 64k, f
IN
= 1 kHz, SNR = 89.55 dB,
SINAD = 89.4 dB, THD = 104 dB, SFDR = 107 dB
Figure 34. Typical FFT Plot (1.25 × V
REF
)
Figure 35. SNR vs Input Frequency
f
IN
= 1 kHz
Figure 36. SNR vs Temperature Figure 37. SINAD vs Input Frequency
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