參數(shù)資料
型號(hào)： EVAL-AD7731EB
廠商： Analog Devices, Inc.
英文描述： Low Noise, High Throughput 24-Bit Sigma-Delta ADC
中文描述： 低噪聲，高吞吐量的24位Σ-Δ模數(shù)轉(zhuǎn)換器
文件頁(yè)數(shù)： 27/44頁(yè)
文件大?。?/td> 411K
代理商： EVAL-AD7731EB
AD7731
–27–
REV. 0
Nonchop Mode (SKIP = 0, CHP = 0)
With CHOP mode disabled and SK IP mode disabled, the only
function of the second stage filter is to give the overall frequency
response. Figure 11 shows the frequency response for the AD7731
with the second stage filter is set for normal FIR operation, chop
mode disabled, the decimal equivalent of the word in the SF bits
set to 1536 and a master clock frequency of 4.9152 MHz. T he
response is analogous to that of Figure 9 with the three-times
larger SF word producing the same 200 Hz output rate. Once
again, the response will scale proportionally with master clock
frequency. T he response is shown from dc to 100 Hz. T he re-
jection at 50 Hz
±
1 Hz and 60 Hz
±
1 Hz is better than 88 dB.
T he –3 dB frequency for the frequency response of the AD7731
with the second stage filter set for normal FIR operation and
chop mode enabled is determined by the following relationship:
f
3
dB
=
0.039
×
f
MOD
×
1
SF
CHP
=
0
(
)
In this case,
f
3
dB
=
7.8 Hz
and the stop-band, where the attenu-
ation is greater than 64.5 dB, is determined by:
f
STOP
=
0.14
×
f
MOD
×
1
SF
CHP
=
0
(
)
In this case,
f
STOP
=
28 Hz.
FREQUENCY – Hz
0
–60
–100
0
90
G
10
20
30
40
50
60
70
80
–10
–50
–70
–90
–30
–40
–80
–20
–120
–110
100
Figure 11. Detailed Full Frequency Response of AD7731
(SKIP = 0, CHP = 0, SF = 1536)
Figure 12 shows the frequency response for the same set of
conditions as for Figure 11 but in this case the response in shown
out to 600 Hz. T his plot is comparable to that of Figure 10. T he
most notable difference is absence of the peaks in the response
at 200 Hz and 400 Hz. As a result, interference at these fre-
quencies will be effectively eliminated before being aliased back
to dc.
T able X VIII summarizes the settling time and subsequent through-
put rate for the various different modes.
FREQUENCY – Hz
0
–60
–100
0
450
G
50
100 150 200 250 300 350 400
–10
–50
–70
–90
–30
–40
–80
–20
–120
–110
500 550
600
Figure 12. Expanded Full Frequency Response of AD7731
(SKIP = 0, CHP = 0, SF = 1536)
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