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參數(shù)資料
型號(hào)： TLC1514ID
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 4-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
封裝： GREEN, PLASTIC, SOIC-16
文件頁(yè)數(shù)： 27/37頁(yè)
文件大小： 572K
代理商： TLC1514ID
TLC1514, TLC1518
5-V, 10-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
SLAS252 – DECEMBER 1999
33
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
simplified analog input analysis
Using the equivalent circuit in Figure 39, 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–EXP
–tc
Rt
Ci
Where
Rt = Rs + Zi
tc = Cycle time
(1)
The input impedance Zi is 0.5 k
at 5 V. The final voltage to 1/2 LSB is given by:
VC (1 2 LSB)
+ VS–
VS
2048
(2)
Equating equation 1 to equation 2 and solving for cycle time tc gives:
Vs–
VS
2048
+ Vs 1–EXP
–tc
Rt
Ci
(3)
and time to change to 1/2 LSB (minimum sampling time) is:
tch (1 2 LSB)
+ Rt
Ci
In(2048)
Where
In(2048) = 7.625
Therefore, with the values given, the time for the analog input signal to settle is:
tch (1 2 LSB)
+ (Rs ) 0.5 kW)
Ci
In(2048)
(4)
This time must be less than the converter sample time shown in the timing diagrams. This is 12
× SCLKs (if the
sampling mode is short normal sampling mode).
tch (1 2 LSB)
v 12
1
f (SCLK)
(5)
Therefore the maximum SCLK frequency is:
max f (SCLK)
+
12
tch 1 2 LSB
+
12
[In(2048)
Rt
Ci]
(6)
相關(guān)PDF資料
PDF描述
TLC1514IPW 4-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
TLC1514IPWRG4 4-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
TLC1514IDR 4-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
TLC1518IPW 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC1518IDWR 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLC1514ID 制造商:Texas Instruments 功能描述:IC 10BIT ADC 400KSPS SMD SOIC16 制造商:Texas Instruments 功能描述:IC, 10BIT ADC, 400KSPS, SMD, SOIC16
TLC1514IDG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 400 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
TLC1514IDR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 400 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
TLC1514IDRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 400 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
TLC1514IPW 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10bit 400kSPS SAR 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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