參數資料
型號： ADS1259IPW
廠商： Texas Instruments
文件頁數： 11/48頁
文件大小： 0K
描述： IC ADC 24BIT 14KSPS LN 20TSSOP
產品培訓模塊： Industrial Automation Overview
標準包裝： 70
位數： 24
采樣率（每秒）： 14k
數據接口： 串行，SPI?
轉換器數目： 1
電壓電源： 模擬和數字，雙 ±
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 20-TSSOP（0.173"，4.40mm 寬）
供應商設備封裝： 20-TSSOP
包裝： 管件
輸入數目和類型： 2 個單端，單極；2 個單端，雙極；1 個差分，單極；1 個差分，雙極
其它名稱： 296-27184-5
0
-
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120
140
Magnitude(dB)
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10
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60
Frequency(kHz)
0
-
20
40
60
80
100
120
140
Magnitude(dB)
0
10
20
30
40
50
60
Frequency(kHz)
sinc
1
sinc
2
0
10
-
20
30
40
50
60
70
80
90
100
Magnitude(dB)
55
56
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60
65
Frequency(Hz)
61
62
63
64
sinc
1
sinc
2
SBAS424D
– JUNE 2009 – REVISED AUGUST 2011
The sinc5 filter produces wide notches at fCLK/512 and
multiples thereof. At these frequencies the filter has
zero gain. Figure 40 shows the response data rate =
14.4kSPS.
With decimation of the second stage, the wide
notches produced by the sinc5 filter remain, but a
number of narrow notches are superimposed in the
response. The first of the notches occur at the data
rate. The number of superimposed notches is
determined by the decimation ratio, minus 1.
The second stage filter has notches (or zeroes) at the
data rate and multiples thereof. Figure 41 shows the
response of the second stage filter combined with the
sinc5
stage.
Decimation
of
4
produces
three
equally-spaced notches between each main notch of
Figure 40. Frequency Response
the sinc5 filter. The frequency response of the other
for Data Rate = 14.4kSPS
data rates (higher decimation ratios) produces a
similar pattern, but with more equally-spaced notches
between the main sinc5 notches. Table 4 lists the first
notch frequency and the
–3dB bandwidth.
Figure 42 illustrates the detail of the magnitude
response with data rate = 60SPS. Note that input
frequencies within the
±1% 60Hz bandwidth are
attenuated 40dB by the sinc1 filter and 80dB by the
sinc2 filter.
Table 4. First Notch Frequency and
–3dB Filter
Bandwidth(1)
–3dB BANDWIDTH (Hz)
DATA RATE
FIRST NOTCH
(SPS)
(Hz)
sinc1
sinc2
10
4.3
3.1
16.6
7.3
5.2
50
22
16
Figure 41. Frequency Response
60
27
19
(Data Rate = 3600SPS, R = 4)
400
177
127
1200
525
380
3600
1440
1100
14400
2930
See (4)
(1) fCLK = 7.3728MHz.
(2) Notch at 50Hz and 60Hz.
(3) Notch at 50Hz.
(4) Same as sinc1.
Figure 42. Magnitude Response
for Data Rate = 60SPS
Copyright
2009–2011, Texas Instruments Incorporated
19
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