參數資料
型號： THS1207IDA
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 4-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32
封裝： GREEN, PLASTIC, TSSOP-32
文件頁數： 20/32頁
文件大小： 317K
代理商： THS1207IDA
THS1207
SLAS284A – AUGUST 2000 – REVISED DECEMBER 2002
www.ti.com
27
ANALOG INPUT CONFIGURATION AND REFERENCE VOLTAGE
The THS1207 features four analog input channels. These can be configured for either single-ended or
differential operation. Figure 36 shows a simplified model, where a single-ended configuration for channel AINP
is selected. The reference voltages for the ADC itself are VREFP and VREFM (either internal or external reference
voltages). The analog input voltage range is between VREFM to VREFP. This means that VREFM defines the
minimum voltage, and VREFP defines the maximum voltage, which can be applied to the ADC. The internal
reference source provides the voltage VREFM of 1.5 V and the voltage VREFP of 3.5 V (see also section
reference voltage). The resulting analog input voltage swing of 2 V can be expressed by:
V
REFM v
AINP
v V
REFP
12-Bit
ADC
VREFP
VREFM
AINP
Figure 36. Single-Ended Input Stage
A differential operation is desired in many applications due to a better signal-to-noise ration. Figure 37 shows
a simplified model for the analog inputs AINM and AINP, which are configured for differential operation. The
differential operation mode provides in terms of performance benefits over single-ended mode and is therefore
recommended for best performance. The THS1207 offers 2 differential analog inputs and in the single-ended
mode 4 analog inputs. If the analog input architecture is differential, common mode noise and common mode
voltages can be rejected. Additional details for both modes are given below.
12-Bit
ADC
VREFP
VREFM
AINP
Σ
VADC
AINM
+
–
Figure 37. Differential Input Stage
In comparison to the single-ended configuration it can be seen that the voltage, VADC, which is applied at the
input of the ADC is the difference between the input AINP and AINM. The voltage VADC can be calculated as
follows:
V
ADC +
ABS(AINP–AINM)
The advantage to single-ended operation is that the common-mode voltage
V
CM +
AINM
) AINP
2
can be rejected in the differential configuration, if the following condition for the analog input voltages is true:
AGND
v AINM, AINP v AV
DD
1V
v V
CM v
4V
(1)
(2)
(3)
(4)
(5)
相關PDF資料
PDF描述
THS1207CDAR 4-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32
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相關代理商/技術參數
參數描述
THS1207IDAG4 功能描述:模數轉換器 - ADC 12-Bit 6MSPS Simult Sampling Quad Ch 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
THS12082 制造商:TI 制造商全稱:Texas Instruments 功能描述:12-BIT, 8 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTERS
THS12082CDA 功能描述:模數轉換器 - ADC 12bit 8 MSPS ADC 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
THS12082CDAG4 功能描述:模數轉換器 - ADC 12 Bit 8 MSPS Dual Ch 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
THS12082CDAR 功能描述:模數轉換器 - ADC 12 Bit 8 MSPS Dual Ch 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
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