參數(shù)資料
型號(hào)： 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(zhuǎn)換器
文件頁(yè)數(shù)： 12/42頁(yè)
文件大?。?/td> 872K
代理商： ADS1286P
ADS1212, 1213
SBAS064A
12
Filter Equation
The digital filter is described by the following transfer
function:
where N is the Decimation Ratio.
This filter has a (sin(x)/x)
3
response and is referred to a sinc
3
filter. For the ADS1212/13, this type of filter allows the data
rate to be changed over a very wide range (nearly four orders
of magnitude). However, the –3dB point of the filter is 0.262
times the data rate. And, as can be seen in Figures 1 and 2,
the rejection in the stopband (frequencies higher than the
first notch frequency) may only be –40dB.
These factors must be considered in the overall system
design. For example, with a 50Hz data rate, a significant
signal at 75Hz may alias back into the passband at 25Hz.
The analog front end can be designed to provide the needed
attenuation to prevent aliasing, or the system may simply
provide this inherently. Another possibility is increasing the
data rate and then post filtering with a digital filter on the
main controller.
Filter Settling
The number of modulator results used to compute each
conversion result is three times the Decimation Ratio. This
means that any step change (or any channel change for the
ADS1213) will require at least three conversions to fully
settle. However, if the change occurs asynchronously, then at
least four conversions are required to ensure complete set-
tling. For example, on the ADS1213, the fourth conversion
result after a channel change will be valid (see Figure 4).
| H (f)|
=
sin
π
f
N
f
MOD
π
f
f
MOD
N
sin
3
the effective resolution of the output data at a given data rate,
but there is also an increase in power dissipation. For Turbo
Mode Rates 2 and 4, the increase is slight. For rates 8 and
16, the increase is more substantial. See the Typical Perfor-
mance Curves for more information.
In a Turbo Mode Rate of 16, the ADS1212/13 can offer 16
bits of effective resolution at a 1kHz data rate. A comparison
of effective resolution versus Turbo Mode Rates and output
data rates is shown in Table IV while Table V shows the
corresponding noise level in
μ
Vrms.
TURBO MODE
The ADS1212/13 offers a unique Turbo Mode feature which
can be used to increase the modulator sampling rate by 2, 4,
8, or 16 times normal. With the increase of modulator
sampling frequency, there can be a substantial increase in
Data
Rate
(Hz)
Turbo
Mode
Rate 1
Turbo
Mode
Rate 2
Turbo
Mode
Rate 4
Turbo
Mode
Rate 8
Turbo
Mode
Rate 16
10
20
40
50
60
100
250
1000
20
19
18
17
17
15
12
21
20
20
19
19
17
14
21
21
21
20
20
19
16
12
21
21
21
21
21
19
14
21
21
21
21
20
16
Effective Resolution (Bits rms)
FIGURE 4. Asynchronous ADS1212/13 Analog Input Volt-
age Step or ADS1213 Channel Change to Fully
Settled Output Data.
DRDY
Serial
I/O
Valid
Data
Valid
Data
Valid
Data
Valid
Data
Data
not
Valid
Data
not
Valid
Data
not
Valid
Significant Analog Input Change
or
ADS1213 Channel Change
t
DATA
TABLE IV. Effective Resolution vs Data Rate and Turbo Mode
Rate. (Gain setting of 1 and 1MHz clock.)
DATA
RATE
(Hz)
TURBO
MODE
RATE 1
TURBO
MODE
RATE 2
TURBO
MODE
RATE 4
TURBO
MODE
RATE 8
TURBO
MODE
RATE 16
10
20
40
50
60
100
250
1000
7.6
15
30
60
60
240
1900
3.8
7.6
7.6
15
15
60
480
3.8
3.8
3.8
7.6
7.6
15
120
1900
3.8
3.8
3.8
3.8
3.8
15
480
3.8
3.8
3.8
3.8
7.6
120
NOISE LEVEL (
μ
Vrms)
TABLE V. Noise Level vs Data Rate and Turbo Mode Rate.
(Gain setting of 1 and 1MHz clock.)
The Turbo Mode feature allows trade-offs to be made
between the ADS1212/13 X
IN
clock frequency, power dissi-
pation, and effective resolution. If a 0.5MHz clock is avail-
able but a 1MHz clock is needed to achieve the desired
performance, a Turbo Mode Rate of 2X will result in the
same effective resolution. Table VI provides a comparison
of effective resolution at various clock frequencies, data
rates, and Turbo Mode Rates.
DATA
RATE
(Hz)
X
CLOCK
FREQUENCY
(MHz)
TURBO
MODE
RATE
EFFECTIVE
RESOLUTION
(Bits rms)
60
60
60
100
100
100
2
1
2
4
8
2
4
8
20
20
20
19
19
19
0.5
2
1
0.5
TABLE VI. Effective Resolution vs Data Rate, Clock
Frequency, and Turbo Mode Rate. (Gain set-
ting of 1.)
相關(guān)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(guān)代理商/技術(shù)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(zhuǎn)換器 - ADC 12bit 200KHz Unipol RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)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(zhuǎn)換器 - ADC 12B Micro Pwr Sampling ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS1286PB 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit Micro Power Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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