3 filter outputs alternately
參數(shù)資料
型號(hào)： AD7709BRU-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 4/32頁(yè)
文件大?。?/td> 0K
描述： IC ADC 16BIT SIGMA-DELTA 24TSSOP
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 16
采樣率（每秒）： 105
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 3.75mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 24-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 24-TSSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類(lèi)型： 2 個(gè)差分，單極；2 個(gè)差分，雙極；4 個(gè)偽差分，單極；4 個(gè)偽差分，雙極
REV. A
AD7709
–12–
As shown in the block diagram, the Sinc
3 filter outputs alternately
contain +VOS and –VOS, where VOS is the respective channel offset.
This offset is removed by performing a running average of 2, which
means that the settling time to any change in programming of
the ADC will be twice the normal conversion time, while an
asynchronous step change on the analog input will not be fully
reflected until the third subsequent output.
t
f
t
SETTLE
ADC
=
=
2
The allowable range for SF is 13 to 255, with a default of 69
(45H). The corresponding conversion rates, conversion times,
and settling times are shown in Table I. Note that the conver-
sion time increases by 0.732 ms for each increment in SF.
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
Table I. ADC Conversion and Settling Times for Various
SF Words
Data Update Rate
Settling Time
SF Word
fADC (Hz)
tSETTLE (ms)
13
105.3
19.04
69 (Default)
19.79
101.07
255
5.35
373.54
Normal mode rejection is the major function of the digital filter
on the AD7709. 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 8 show the filter rejection for a selection
of SF words.
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 = 69
OUTPUT DATA RATE = 19.8Hz
INPUT BANDWIDTH = 4.74Hz
FIRST NOTCH = 9.9Hz
50Hz REJECTION = –66dB, 50Hz
1Hz REJECTION = –60dB
60Hz REJECTION = –117dB, 60Hz
1Hz REJECTION = –94dB
Figure 7. Filter Profile with Default SF = 69 Giving Filter
Notches at Both 50 Hz and 60 Hz
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 = 255
OUTPUT DATA RATE = 5.35Hz
INPUT BANDWIDTH = 1.28Hz
50Hz REJECTION = –93dB, 50Hz
1Hz REJECTION = –93dB
60Hz REJECTION = –74dB, 60Hz
1Hz REJECTION = –68dB
Figure 8. Filter Profile with SF = 255
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