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| 型号： | TLV2543CDBRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 11-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封装： | GREEN, PLASTIC, SSOP-20 |
| 文件页数： | 13/28页 |
| 文件大小： | 553K |
| 代理商： | TLV2543CDBRG4 |
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TLV2543C, TLV2543I
12-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SLAS096C – MARCH 1995 – REVISED JUNE 2000
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATIONS INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 18, 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
(1)
Where:
Rt = Rs + ri
V
C +
V
S
1–e
–tc RtCi
The final voltage to 1/2 LSB is given by
(2)
VC (1/2 LSB) = VS – (VS/8192)
Equating equation 1 to equation 2 and solving for time tc gives
(3)
and
tc (1/2 LSB) = Rt × Ci × ln(8192)
(4)
V
S *
V
S
58192
+ V
S
1–e
–tc RtCi
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(8192)
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
TLV2543
Ci
VI
VI = Input Voltage at AIN
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 18. Equivalent Input Circuit Including the Driving Source
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TLV2543CDW | 功能描述:模数转换器 - ADC 12bit ADC w/11Chl 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 |
| TLV2543CDWG4 | 功能描述:模数转换器 - ADC 12-Bit 66 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 |
| TLV2543CDWR | 功能描述:模数转换器 - ADC 12-Bit 66 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 |
| TLV2543CDWRG4 | 功能描述:模数转换器 - ADC 12-Bit 66 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 |
| TLV2543CN | 功能描述:模数转换器 - ADC 12bit ADC w/11Chl 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 |
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