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參數(shù)資料
| 型號： | TLC2558QDW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | PLASTIC, SOIC-20 |
| 文件頁數(shù)： | 26/45頁 |
| 文件大小： | 1039K |
| 代理商： | TLC2558QDW |
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TLC2554, TLC2558
5-V, 12-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
SLAS220A –JUNE 1999
32
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
8192
(2)
Equating equation 1 to equation 2 and solving for cycle time tc gives:
Vs–
VS
8192
+ 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(8192)
Where
In(8192) = 9.011
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(8192)
(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(8192)
Rt
Ci]
(6)
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TLC2558QDWR | 制造商:Texas Instruments 功能描述:12-BIT, 400 KSPS ADC, 8-CH. SERIAL WITH POWERDOWN - Tape and Reel |
| TLC2574EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 TLC2574 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| TLC2574IDW | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Serial Out Low Power 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLC2574IDWG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Serial Out LO PWR 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLC2574IDWR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Serial Out Low Power 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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