參數(shù)資料
型號： ADS1286P
元件分類： ADC
英文描述： Analog-to-Digital Converter??? 12-Bit
中文描述： 12位模數(shù)轉換器
文件頁數(shù)： 11/42頁
文件大?。?/td> 872K
代理商： ADS1286P
ADS1212, 1213
SBAS064A
11
f
DATA
=
f
XIN
Turbo Mode
128
Decimation Ratio
+1
(
)
f
MOD
=
f
XIN
Turbo Mode
128
f
XIN
—
The frequency of the crystal oscillator or CMOS
compatible input signal at the X
IN
input of the ADS1212/13.
f
MOD
—
The frequency or speed at which the modulator of the
ADS1212/13 is running, given by the following equation:
f
SAMP
—
The frequency or switching speed of the input
sampling capacitor. The value is given by the following
equation:
f
DATA
, t
DATA
—
The frequency of the digital output data
produced by the ADS1212/13 or the inverse of this (the
period), respectively, f
DATA
is also referred to as the data rate.
Conversion Cycle—
The term “conversion cycle” usually
refers to a discrete A/D conversion operation, such as that
performed by a successive approximation converter. As
used here, a conversion cycle refers to the t
DATA
time period.
However, each digital output is actually based on the modu-
lator results from the last three t
DATA
time periods.
DIGITAL FILTER
The digital filter of the ADS1212/13 computes the output
result based on the most recent results from the delta-sigma
modulator. The number of modulator results that are used
depend on the decimation ratio set in the Command Regis-
ter. At the most basic level, the digital filter can be thought
of as simply averaging the modulator results and presenting
this average as the digital output.
While the decimation ratio determines the number of modu-
lator results to use, the modulator runs faster at higher Turbo
Modes. These two items, together with the ADS1212/13
clock frequency, determine the output data rate:
Also, since the conversion result is essentially an average,
the data rate determines where the resulting notches are in
the digital filter. For example, if the output data rate is 1kHz,
then a 1kHz input frequency will average to zero during the
1ms conversion cycle. Likewise, a 2kHz input frequency
will average to zero, etc.
In this manner, the data rate can be used to set specific notch
frequencies in the digital filter response (see Figure 1 for the
normalized response of the digital filter). For example, if the
rejection of power line frequencies is desired, then the data
rate can simply be set to the power line frequency. Figures
2 and 3 show the digital filter response for a data rate of
50Hz and 60Hz, respectively.
f
SAMP
=
f
XIN
Turbo Mode
Gain Setting
128
FILTER RESPONSE
Frequency (Hz)
–
40
–
60
–
80
–
100
–
120
–
140
–
160
45
46
47
48
49
50
51
52
53
54
55
FILTER RESPONSE
Frequency (Hz)
0
–
20
–
40
–
60
–
80
–
100
–
120
–
140
–
160
0
50
100
150
200
250
300
G
G
NORMALIZED DIGITAL FILTER RESPONSE
Frequency (Hz)
0
–
20
–
40
–
60
–
80
–
100
–
120
–
140
–
160
0
1
2
3
4
5
6
G
FIGURE 3. Digital Filter Response at a Data Rate of 60Hz.
FIGURE 1. Normalized Digital Filter Response.
FIGURE 2. Digital Filter Response at a Data Rate of 50Hz.
If the effective resolution at a 50Hz or 60Hz data rate is not
adequate for the particular application, then power line fre-
quencies could still be rejected by operating the ADS1212/13
at 25/30Hz, 16.7/20Hz, 12.5/15Hz, etc. If a higher data rate
is needed, then power line frequencies must either be rejected
before conversion (with an analog notch filter) or after
conversion (with a digital notch filter running on the main
controller).
FILTER RESPONSE
Frequency (Hz)
–
40
–
60
–
80
–
100
–
120
–
140
–
160
55
56
57
58
59
60
61
62
63
64
65
FILTER RESPONSE
Frequency (Hz)
0
–
20
–
40
–
60
–
80
–
100
–
120
–
140
–
160
0
50
100
150
200
250
300
G
G
f
DATA
=
f
XIN
Turbo Mode
128
Decimation Ratio
+1
(
)
,
t
DATA
=
1
f
DATA
相關PDF資料
PDF描述
ADS1286PA Analog-to-Digital Converter??? 12-Bit
ADS1286PB Analog-to-Digital Converter??? 12-Bit
ADS1286PC Analog-to-Digital Converter??? 12-Bit
ADS1286PK Analog-to-Digital Converter??? 12-Bit
ADS1286PL Analog-to-Digital Converter??? 12-Bit
相關代理商/技術參數(shù)
參數(shù)描述
ADS1286P 制造商:Texas Instruments 功能描述:IC 12BIT ADC 200 KHZ PDIP8 1286
ADS1286PA 功能描述:模數(shù)轉換器 - ADC 12bit 200KHz Unipol RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS1286PA 制造商:BURR-BROWN 功能描述:IC 12BIT ADC 1286 DIP8 制造商:Texas Instruments 功能描述:Analog-Digital Converter IC Number of Bi
ADS1286PAG4 功能描述:模數(shù)轉換器 - ADC 12B Micro Pwr Sampling ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS1286PB 功能描述:模數(shù)轉換器 - ADC 12-Bit Micro Power Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
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