- 您現在的位置：買賣IC網 > PDF目錄98237 > TLC2554CDG4 (TEXAS INSTRUMENTS INC) 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 PDF資料下載
參數資料
| 型號： | TLC2554CDG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | GREEN, PLASTIC, MS-012AC, SOIC-16 |
| 文件頁數： | 27/48頁 |
| 文件大小： | 1072K |
| 代理商： | TLC2554CDG4 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁當前第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁
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
33
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
Rs
ri
VS
VC
Driving Source
TLC2554/58
Ci
VI
VI = Input Voltage at AIN
VS = External Driving Source Voltage
Rs = Source Resistance
ri = Input Resistance (MUX on Resistance)
Ci = Input Capacitance
VC= Capacitance Charging Voltage
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 37. Equivalent Input Circuit Including the Driving Source
maximum conversion throughput
For a supply voltage of 5 V, if the source impedance is less than 1 k
, and the ADC analog input capacitance
Ci is less than 50 pF, this equates to a minimum sampling time tch(0.5 LSB) of 0.676
s. Since the sampling
time requires 12 SCLKs, the fastest SCLK frequency is 12/tch = 18 MHz.
The minimal total cycle time is given as:
tc
+ tcommand ) tch ) tconv ) td(EOCH–CSL) + 4
1
f (SCLK)
) 12
1
f (SCLK)
) 1.6 ms ) 0.1 ms
+ 16
1
18
MHz
) 1.7 ms + 2.59 ms
This is equivalent to a maximum throughput of 386 KSPS. The throughput can be even higher with a smaller
source impedance.
When source impedance is 100
, the minimum sampling time becomes:
tch (1 2 LSB)
+ Rt
Ci
In(8192)
+ 0.27 ms
The maximum SCLK frequency possible is 12/tch = 44 MHz. Then a 20 MHz clock (maximum SCLK frequency
for the TLC2554/2548 ) can be used. The minimal total cycle time is then reduced to:
tc
+ tcommand ) tch ) tconv ) td(EOCH–CSL) + 4
1
f (SCLK)
) 12
1
f (SCLK)
) 1.6 ms ) 0.1 ms
+ 0.8 ms ) 1.6 ms ) 0.1 ms + 2.5 ms
The maximum throughput is 1/2.5
s = 400 KSPS for this case.
相關PDF資料 |
PDF描述 |
|---|---|
| TLC2554IDG4 | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| TLC2558IPW | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| TLC2558IDW | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| TLC2558IPWG4 | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| TLC2558IPWR | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TLC2554CDR | 功能描述:模數轉換器 - ADC 12-bit 400 KSPS 4-Ch Serial w/Powerdown RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 |
| TLC2554CDRG4 | 功能描述:模數轉換器 - ADC 12-bit 400 KSPS 4-Ch Serial w/Powerdown RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 |
| TLC2554CPW | 功能描述:模數轉換器 - ADC 12-bit 400 KSPS 4-Ch Serial w/Powerdown RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 |
| TLC2554CPWG4 | 功能描述:模數轉換器 - ADC 12-bit 400 KSPS 4-Ch Serial w/Powerdown RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 |
| TLC2554CPWR | 功能描述:模數轉換器 - ADC 12-bit 400 KSPS 4-Ch Serial w/Powerdown RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 |
發布緊急采購，3分鐘左右您將得到回復。