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| 型号： | TLC1514IPWG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 4-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| 封装： | GREEN, PLASTIC, TSSOP-16 |
| 文件页数： | 28/37页 |
| 文件大小： | 572K |
| 代理商： | TLC1514IPWG4 |
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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
34
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
Rs
ri
VS
VC
Driving Source
TLC1514/18
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 38. 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 0.571
s. Since the sampling
time requires 12 SCLKs, the fastest SCLK frequency is 12/tch = 20 MHz.
The minimal total cycle time is given as:
tc
+ tcommand ) tch ) tconv ) td(EOCH–CSL) + 4
1
f (SCLK)
) 12
1
f (SCLK)
) 1.4 ms ) 0.1 ms
+ 16
1
20
MHz
) 1.5 ms + 2.3 ms
This is equivalent to a maximum throughput of 400 KSPS. The throughput can be even higher with a smaller
source impedance.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TLC1514IPWR | 功能描述:模数转换器 - ADC 10-Bit 400 kSPS Serial Out RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TLC1514IPWRG4 | 功能描述:模数转换器 - ADC 10-Bit 400 kSPS Serial Out RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TLC1514PW | 制造商:TI 制造商全称:Texas Instruments 功能描述:5-V, 10-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER, SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN |
| TLC1518 | 制造商:TI 制造商全称:Texas Instruments 功能描述:5-V, 10-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER, SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN |
| TLC1518D | 制造商:TI 制造商全称:Texas Instruments 功能描述:5-V, 10-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER, SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN |
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