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| 型號： | ADS1225IRGVTG4 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator |
| 中文描述： | 24位模擬數(shù)字轉(zhuǎn)換器與單和雙通道差分輸入和內(nèi)部振蕩器 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 398K |
| 代理商： | ADS1225IRGVTG4 |
www.ti.com
TEMPERATURE SENSOR
VOLTAGE REFERENCE INPUTS
(VREFP, VREFN)
AVDD
Zeff= 500k
W
VREFP
VREFN
AVDD
ESD
Protection
16pF
GND
100mV
(VREFP, VREFN)
VDD
100mV
AINP
AINP1
AINN1
AINP2
AINN2
8I
1I
1X
8X
AINN
TEMPEN
AVDD
MUX
ADS1225
ADS1226
SBAS346–MAY 2006
Internal
capability. By setting the TEMPEN pin high, the
selected analog inputs are disconnected and the
inputs to the A/D converter are connected to the
anodes of two diodes scaled to 1x and 64x in current
and size inside the MUX, as shown in
Figure 24
. By
measuring the difference in voltage of these diodes,
temperature changes can be inferred from a baseline
temperature.
Typically,
the
voltages is 106mV at +25
°
C, with a temperature
coefficient of 360
μ
V/
°
C. A similar structure is used in
the MSC1210 for temperature measurement. For
more
information,
see
SBAA100
,
Using the MSC121x as a High-Precision
Intelligent
Temperature
download at
www.ti.com
.
diodes
provide
temperature-sensing
The voltage reference used by the modulator is
generated from the voltage difference between
VREFP and VREFN: V
= VREFP – VREFN. The
reference inputs use a structure similar to that of the
analog inputs. A simplified diagram of the circuitry on
the reference inputs is shown in
Figure 25
. The
switches and capacitors can be modeled with an
effective impedance of 250k
.
difference
in
diode
TI
application
report
Sensor
,
available
for
Figure 25. Simplified Reference Input Circuitry
ESD diodes protect the reference inputs. To prevent
these diodes from turning on, make sure the
voltages on the reference pins do not go below GND
by more than 100mV, and likewise, do not exceed
VDD
by
100mV.
This
Equation 2
:
limitation
is
shown
in
(2)
For best performance, bypass the voltage reference
inputs with a 0.1
μ
F capacitor between VREFP and
VREFN. Place the capacitor as close as possible to
the pins.
Figure 24. Measurement of the Temperature
Sensor in the Input
The differential voltage reference inputs and the wide
range of operation (V
REF
can support up to AVDD)
make ratiometric measurements easy to implement.
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS1226 | 制造商:AD 制造商全稱:Analog Devices 功能描述:24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator |
| ADS1226IRGVR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit 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 |
| ADS1226IRGVRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit 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 |
| ADS1226IRGVT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit 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 |
| ADS1226IRGVT | 制造商:Texas Instruments 功能描述:A/D Converter (A-D) IC |
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