參數(shù)資料
型號(hào)： TLC541IFN
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： ADC
英文描述： 11-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC20
封裝： GREEN, PLASTIC, LCC-20
文件頁(yè)數(shù)： 15/16頁(yè)
文件大小： 296K
代理商： TLC541IFN
TLC540I, TLC541I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 INPUTS
SLAS065B – OCTOBER 1983 – REVISED JUNE 2001
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 1, the time required to charge the analog input capacitance from 0 to VS
within 1/2 LSB can be derived as follows:
The capacitance charging voltage is given by
(1)
where
Rt = Rs + ri
V
C +
V
S
1–e
–tc RtCi
The final voltage to 1/2 LSB is given by
(2)
VC (1/2 LSB) = VS – (VS/512)
Equating equation 1 to equation 2 and solving for time tc gives
(3)
and
tc (1/2 LSB) = Rt × Ci × ln(512)
(4)
V
S *
V
S
512
+ V
S
1–e
–tc RtCi
Therefore, with the values given the time for the analog input signal to settle is
(5)
tc (1/2 LSB) = (Rs + 1 k) × 60 pF × ln(512)
This time must be less than the converter sample time shown in the timing diagrams.
Rs
ri
VS
VC
50 pF MAX
1 k
MAX
Driving Source
TLC540/1
Ci
VI
VI = Input Voltage at INPUT A0 – A10
VS = External Driving Source Voltage
Rs = Source Resistance
ri = Input Resistance
Ci = Equivalent Input Capacitance
Driving source requirements:
Noise and distortion for the source must be equivalent to the
resolution of the converter.
Rs must be real at the input frequency.
Figure 1. Equivalent Input Circuit Including the Driving Source
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLC541IFNG3 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8bit 11Chl A/D 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
TLC541IFNR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8Bit 40kSPS Serial Out 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
TLC541IFNRG3 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8Bit 40kSPS Serial Out 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
TLC541IN 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8bit 11Chl A/D 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
TLC541INE4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8Bit 40kSPS Serial Out 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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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