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| 型号： | THS1031IDWG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封装： | GREEN, PLASTIC, SOIC-28 |
| 文件页数： | 6/41页 |
| 文件大小： | 728K |
| 代理商： | THS1031IDWG4 |
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THS1031
3-V TO 5.5-V, 10-BIT, 30 MSPS
CMOS ANALOG-TO-DIGITAL CONVERTER
SLAS242E – NOVEMBER 1999 – REVISED MARCH 2002
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
sample-and-hold
The analog input signal AIN is applied to the AIN pin, either dc-coupled, ac-coupled, or ac-coupled with dc
restoration using the THS1031 clamp circuit.
The differential sample and hold processes AIN with respect to the voltages applied to the REFTS and REFBS
pins, to give a differential output VP+ – VP– = VP given by:
VP = AIN – VM
Where:
VM
+
(REFTS
) REFBS)
2
For single-ended input signals, VM is a constant voltage; usually the AIN mid-scale input voltage. However if
MODE = AVDD/2 then REFTS and REFBS can be connected together to operate with AIN as a complementary
pair of differential inputs (see Figures 15 and 16).
programmable gain amplifier
VP is amplified by the PGA and fed into the ADC as a differential voltage VQ+ – VQ– = VQ
VQ
= Gain
× VP = Gain × [AIN – VM]
The default PGA gain at power up is 1, but can be programmed from 0.5 to 4.0 via the control register.
analog-to-digital converter
In all operating configurations, VQ is digitized against ADC reference voltages REFTF and REFBF, full-scale
values of VQ being given by
VQFS
)+
) (REFTF * REFBF)
2
VQFS
*+
* (REFTF * REFBF)
2
VQ voltages outside the range VQFS– to VQFS+ lie outside the conversion range of the ADC. Attempts to
convert out-of-range inputs are signalled to the application by driving the OVR output pin high. VQ voltages less
than VQFS – give ADC output code 0. VQ voltages greater than VQFS+ give output code 1023.
complete system
Combining equations 1 to 3, the analog full-scale input voltages at AIN which give VQFS+ and VQFS– at the
PGA output are:
A
IN +
FS
)+ VM )
(REFTF
* REFBF)
(2
Gain)
and
A
IN +
FS
*+ VM *
(REFTF
* REFBF)
(2
Gain)
The analog input span (voltage range) that lies within the ADC conversion range is:
Input span
+ [(FS )) * (FS *)] + (REFTF * REFBF) Gain
(1)
(2)
(3)
(4)
(5)
(6)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS1031IDWR | 功能描述:模数转换器 - ADC 10-Bit 30 MSPS 1-Ch 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 |
| THS1031IDWRG4 | 功能描述:模数转换器 - ADC 10-Bit 30 MSPS 1-Ch 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 |
| THS1031IPW | 功能描述:模数转换器 - ADC _ 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 |
| THS1031IPWG4 | 功能描述:模数转换器 - ADC 10B 30 MSPS ADC Sgl Ch. Integ. Pgmable 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 |
| THS1031IPWR | 功能描述:模数转换器 - ADC 10-Bit 30 MSPS 1-Ch 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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