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參數(shù)資料
型號(hào)： THS1040CPWRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
封裝： GREEN, PLASTIC, TSSOP-28
文件頁(yè)數(shù)： 18/36頁(yè)
文件大小： 751K
代理商： THS1040CPWRG4
THS1040
SLAS290C OCTOBER 2001 REVISED OCTOBER 2004
25
www.ti.com
APPLICATION INFORMATION
C1
8 pF
AVDD
AGND
VCM = AIN+/AIN Common Mode Voltage
AIN
_
+
IIN
R2 = 1/CS fCLK
Figure 33. Equivalent Circuit for the AIN Switched Capacitor Input
AIN input damping
The charging current pulses into AIN+ and AIN can make the signal sources jump or ring, especially if the
sources are slightly inductive at high frequencies. Inserting a small series resistor of 20
or less and a small
capacitor to ground of 20 pF or less in the input path can damp source ringing (see Figure 34). The resistor and
capacitor values can be made larger than 20
and 20 pF if reduced input bandwidth and a slight gain error (due
to potential division between the external resistors and the AIN equivalent resistors) are acceptable.
Note that the capacitors should be soldered to a clean analog ground with a common ground point to prevent
any voltage drops in the ground plane appearing as a differential voltage at the ADC inputs.
AIN
R < 20
VS
C < 20 pF
Figure 34. Damping Source Ringing Using a Small Resistor and Capacitor
driving the VREF pin
Figure 35 shows the equivalent load on the VREF pin when driving the ADC internal references buffer via this
pin (MODE = AVDD/2 or AVDD and REFSENSE = AVDD).
AVDD
AGND
(AVDD + VREF) /4
VREF
RIN
10 k
REFSENSE = AVDD,
MODE = AVDD/2 or AVDD
_
+
MODE = AVDD
Figure 35. Equivalent Circuit of VREF
The nominal input current IREF is given by:
I
REF +
3V
REF *
AV
DD
4
R
IN
(13)
相關(guān)PDF資料
PDF描述
THS1040IDW 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
THS1040IDWR 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
THS1040IPWR 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
THS1040IDWG4 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS1040EVM 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 THS1040 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
THS1040IDW 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10 Bit 40 MSPS Low Power 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
THS1040IDWG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10 Bit 40 MSPS Low Power 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
THS1040IDWR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10 Bit 40 MSPS Low Power 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
THS1040IDWRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10 Bit 40 MSPS Low Power 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
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