參數(shù)資料
型號： TLC542IFNG3
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 11-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC20
封裝： GREEN, PLASTIC, LCC-20
文件頁數(shù)： 11/12頁
文件大?。?/td> 172K
代理商： TLC542IFNG3
TLC542C, TLC542I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 INPUTS
SLAS075C – FEBRUARY 1989 – REVISED JUNE 2001
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 8, 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
– tc/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)
– tc/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.
Rs
ri
VS
VC
50 pF MAX
1 k
MAX
Driving Source
TLC542
Ci
VI
VI = Input Voltage at INPUT A0 – A10
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.
Figure 8. Equivalent Input Circuit Including the Driving Source
相關(guān)PDF資料
PDF描述
TLC542CDWRG4 11-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC542IN 11-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP20
TLC542IDW 11-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC542CN 11-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP20
TLC542CDWR 11-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLC542IFNR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8bit 25ksps 11ch 5V 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
TLC542IFNRG3 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 25 kSPS 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
TLC542IN 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8bit A/D w/Osc 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
TLC542INE4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 25 kSPS 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
TLC545 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
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