參數資料
| 型號： | SX8725CWLTDT |
| 廠商： | Semtech |
| 文件頁數： | 43/68頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAS ADC 16BIT I2C/SRL |
| 標準包裝： | 1 |
| 系列： | ZoomingADC™ |
| 類型： | 數據采集系統(tǒng)（DAS） |
| 輸入類型： | 差分 |
| 輸出類型： | 數字 |
| 接口： | I²C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 12-WDFN 裸露焊盤 |
| 供應商設備封裝： | 12-MLPD-EP（4x4） |
| 包裝： | 標準包裝 |
| 其它名稱： | SX8725CWLTDTDKR |
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Page 48
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
11.1.1 Switched Capacitor Principle
Basically, a switched capacitor is a way to emulate a resistor by using a capacitor. The capacitors are much easier to
realize on CMOS technologies and they show a very good matching precision.
A resistor is characterized by the current that flows through it (positive current leaves node V1):
One can verify that the mean current leaving node V1 with a capacitor switched at frequency f is:
Therefore as a mean value, the switched capacitor 1/(f x C) is equivalent to a resistor.
It is important to consider that this is only a mean value. If the current is not integrated (low impedance source), the
impedance is infinite during the whole time but the transition.
What does it mean for the ZoomingADC?
If the fs clock is reduced, the mean impedance is increased. By dividing the fs clock by a factor 10, the impedance is
increased by a factor 10.
One can reduce the capacitor that is switched by using an amplifier set to its minimal gain. In particular if PGA1 is used
with gain 1, its mean impedance is 10x bigger than when it is used with gain 10.
One can increase the effective impedance by increasing the electrical bandwidth of the sensor node so that the
switching current is absorbed through the sensor before the switching period is over. Measuring the sensor node will
Figure 26. The Switched Capacitor Principle
Equation 25
Equation 26
Figure 27. The Switched Capacitor Principle
V
1
V
2
R
V
1
f
fV
2
]
[
2
1
A
R
V
I
=
(
)
]
[
2
1
A
C
f
V
I
=
Sensor
C
ZoomingADC (model)
V
1
f
fV
2
Sensor
impedence
Node
Capacitance
Current
integration
Not
Recommended
for
New
Designs
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| SY10E446JC TR | IC CONV 4-BIT SER/PAR 28-PLCC |
| SY54017ARMG TR | IC MULTIPLEXER DUAL 1X1 16MLF |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SX8725E083TDT | 功能描述:IC DAS PRESS/TEMP SENS 12MLPD RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:ZoomingADC™ 其它有關文件:Automotive Product Guide 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數字 輸出類型:數字 接口:JTAG，串行 電流 - 電源:100µA 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 |
| SX8725E083TRT | 功能描述:IC DAS PRESSURE/TEMP SENS 12MLPD RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:ZoomingADC™ 其它有關文件:Automotive Product Guide 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數字 輸出類型:數字 接口:JTAG，串行 電流 - 電源:100µA 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 |
| SX8725S | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:ZoomingADC for sensing data acquisition ADVANCED COMMUNICATIONS & SENSING |
| SX8725SWLTDT | 制造商:Semtech Corporation 功能描述: 制造商:Semtech Corporation 功能描述:1 INPUTS ZOOMING ADC WITH SPI |
| SX8733 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Precision Diode Digital Temperature For Up To 3 External Sensors |
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