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參數(shù)資料
| 型號(hào)： | ADS1250U |
| 英文描述： | 20-Bit Data Acquisition System ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 20位數(shù)據(jù)采集系統(tǒng)的模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 196K |
| 代理商： | ADS1250U |
19
ADS1250
LAYOUT
POWER SUPPLIES
The analog supply should be well regulated and low noise.
For designs requiring very high resolution from the ADS1250,
power supply rejection will be a concern. Avoid running
digital lines under the device as they may couple noise onto
the die. The requirements for the digital supply are not as
strict, however, high frequency noise on V
D
can capacitively
couple into the analog portion of the ADS1250. This noise
can originate from switching power supplies, very fast
microprocessors, or digital signal processors. For either
supply, high frequency noise will alias back into the pass-
band of the digital filter, affecting the conversion result. If
one supply must be used to power the ADS1250, the V
S
supply should be used to power V
D
. This connection can be
made via a 10
resistor which, along with the decoupling
capacitors, will provide some filtering between V
D
and V
S
.
In some systems, a direct connection can be made. Experi-
mentation may be the best way to determine the appropriate
connection between V
S
and V
D
.
GROUNDING
The analog and digital sections of the design should be
carefully and cleanly partitioned. Each section should have
its own ground plane with no overlap between them. AGND
+V
D
Digital
Filter
Serial
Output
ADS1250
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
+V
IN
–V
IN
+V
S
AGND
V
REF
DSYNC
10
μ
F
0.1
μ
F
DGND
G1
G0
CS
DRDY
CLK
SCLK
DOUT
Σ
Modulator
PGA
+
–
10
μ
F
0.1
μ
F
DGND
FIGURE 25. Connection Diagram.
TYPICAL CONNECTION
should be connected to the analog ground plane as well as all
other analog grounds. DGND should be connected to the
digital ground plane and all digital signals referenced to this
plane. The ADS1250 pinout is such that the converter is
cleanly separated into an analog and digital portion. This
should allow simple layout of the analog and digital sections
of the design. For a single converter system, AGND and
DGND of the ADS1250 should be connected together,
underneath the converter. Do not join the ground planes, but
connect the two with a moderate signal trace. For multiple
converters, connect the two ground planes at one location as
central to all of the converters as possible. In some cases,
experimentation may be required to find the best point to
connect the two planes together. The printed circuit board
can be designed to provide different analog/digital ground
connections via short jumpers. The initial prototype can be
used to establish which connection works best.
DECOUPLING
Good decoupling practices should be used for the ADS1250
and for all components in the design. All decoupling capaci-
tors, but specifically the 0.1
μ
F ceramic capacitors, should be
placed as close as possible to the pin being decoupled. A
1
μ
F to 10
μ
F capacitor, in parallel with a 0.1
μ
F ceramic
capacitor, should be used to decouple V
S
to AGND. At a
minimum, a 0.1
μ
F ceramic capacitor should be used to
decouple V
D
to DGND, as well as for the digital supply on
each digital component.
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| ADS1250U/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC SpeedPlus 20-Bit Data Acq System 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 |
| ADS1250U/1KG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC SpeedPlus 20-Bit Data Acq System 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 |
| ADS1250UG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC SpeedPlus 20-Bit Data Acq System 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 |
| ADS1251 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:24-Bit, 20kHz, Low-Power ANALOG-TO-DIGITAL CONVERTER |
| ADS1251EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS1251 ADC Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
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