參數(shù)資料
型號： EVAL-AD7708EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 8/44頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD7708
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 1.37k
數(shù)據(jù)接口： 串行
輸入范圍： ±2.5 V
在以下條件下的電源（標(biāo)準(zhǔn)）： 3.84mW @ 3V
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7708
已供物品： 板，CD
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AD7708BRZ-REEL7-ND - IC ADC 16BIT R-R 8/10CH 28SOIC
AD7708BRZ-REEL-ND - IC ADC 16BIT R-R 8/10CH 28SOIC
AD7708BRUZ-REEL-ND - IC ADC 16BIT R-R 8/10CH 28TSSOP
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AD7708BRU-REEL-ND - IC ADC 16BIT R-R 8/10CH 28-TSSOP
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更多...
其它名稱： EVAL-AD7708EB
EVAL-AD7708EB-ND
REV. 0
–16–
AD7708/AD7718
Table I. ADC Conversion and Settling Times for Various
SF Words with
CHOP = 0
SF
Data Update Rate
Settling Time
Word
fADC (Hz)
tSETTLE (ms)
13
105.3
19.04
23
59.36
33.69
27
50.56
39.55
45
30.3
65.9
69 (Default)
19.79
101.07
91
15
133.1
182
7.5
266.6
255
5.35
373.54
The overall frequency response is the product of a sinc
3 and a
sinc response. There are sinc
3 notches at integer multiples of
3
× fADC and there are sinc notches at odd integer multiples
of fADC/2. The 3 dB frequency for all values of SF obeys the
following equation:
f (3 dB) = 0.24
× f
ADC
Normal-mode rejection is the major function of the digital filter
on the AD7708/AD7718. The normal mode 50
±1 Hz rejection
with an SF word of 82 is typically –100 dB. The 60
± 1 Hz
rejection with SF = 68 is typically –100 dB. Simultaneous 50 Hz
and 60 Hz rejection of better than 60 dB is achieved with an SF
of 69. Choosing an SF word of 69 places notches at both 50 Hz
and 60 Hz. Figures 5 to 9 show the filter rejection for a selection
of SF words.
The frequency response of the filter H (f) is as follows:
1
8
81
2
3
SF
f f
ff
MOD
OUT
×
×× ×
×
××
×
sin (
/
)
sin (
/
)
sin (
/
)
sin (
/
)
π
where
fMOD = 32,768 Hz,
SF = value programmed into SF Register,
fOUT = fMOD/(SF
× 8 × 3).
The following plots show the filter frequency response for a
variety of update rates from 5 Hz to 105 Hz.
FREQUENCY – Hz
0
–140
–200
0
650
50 100 150 200 250 300 350 400 450 500 550 600
700
A
TTENUA
TION
–
dB
–20
–120
–160
–180
–60
–100
–40
–80
SF = 13
OUTPUT DATA RATE = 105Hz
INPUT BANDWIDTH = 25.2Hz
FIRST NOTCH = 52.5Hz
50Hz REJECTION = –23.6dB, 50Hz 1Hz REJECTION = –20.5dB
60Hz REJECTION = –14.6dB, 60Hz 1Hz REJECTION = –13.6dB
Figure 5. Filter Profile with SF = 13
FREQUENCY – Hz
0
–80
–160
0
100
10
A
TTENUA
TION
–
dB
20
30
40
50
60
70
80
90
–20
–40
–120
–140
–60
–100
SF = 82
OUTPUT DATA RATE = 16.65Hz
INPUT BANDWIDTH = 4Hz
50Hz REJECTION = –171dB, 50Hz 1Hz REJECTION = –100dB
60Hz REJECTION = –58dB, 60Hz 1Hz REJECTION = –53dB
Figure 6. Filter Profile with SF = 82
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