參數(shù)資料
型號： TLC545IFNR
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 19-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC28
封裝： LCC-28
文件頁數(shù)： 15/15頁
文件大?。?/td> 202K
代理商： TLC545IFNR
TLC545C, TLC545I, TLC546C, TLC546I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 19 INPUTS
SLAS066B – DECEMBER 1985 – REVISED OCTOBER 1996
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT 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
VC = VS 1–e
–t c/RtCi
(
)
(1)
where
Rt = Rs + ri
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
VS –(VS/512) = VS 1–e
(
)
(3)
–t c/RtCi
and
tc (1/2 LSB) = Rt × Ci × ln(512)
(4)
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.
VI = Input Voltage at INPUT A0 – A18
VS = External Driving Source Voltage
Rs = Source Resistance
ri = Input Resistance
Ci = 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.
Rs
ri
VS
VC
50 pF MAX
1 k
MAX
Driving Source
TLC545 / 6
Ci
VI
Figure 1. Equivalent Input Circuit Including the Driving Source
相關(guān)PDF資料
PDF描述
TLC545CNG4 19-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP28
TLC545ING4 19-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP28
TLC545CFN 19-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC28
TLC546IN 19-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP28
TLC545IFN 19-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLC545IN 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8bit 20Chl 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
TLC545ING4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8B 76 kSPS ADC 19Ch 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
TLC546C 制造商:TI 制造商全稱:Texas Instruments 功能描述:8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 19 INPUTS
TLC546I 制造商:TI 制造商全稱:Texas Instruments 功能描述:8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 19 INPUTS
TLC546IFN 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:
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