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參數(shù)資料
| 型號： | THS1209IDA |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| 封裝： | GREEN, PLASTIC, TSSOP-32 |
| 文件頁數(shù)： | 22/33頁 |
| 文件大小： | 312K |
| 代理商： | THS1209IDA |
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THS1209
SLAS288B – JULY 2000 – REVISED DECEMBER 2002
www.ti.com
29
DC COUPLING
An operational amplifier can be configured to shift the signal level according to the analog input voltage range of the
THS1209. The analog input voltage range of the THS1209 goes from 1.5 V to 3.5 V. An op-amp can be used as
shown in Figure 35.
Figure 35 shows an example where the analog input signal in the range from –1 V up to 1 V is shifted by an
operational amplifier to the analog input range of the THS1209 (1.5 V to 3.5 V). The operational amplifier is configured
as an inverting amplifier with a gain of –1. The required dc voltage of 1.25 V at the noninverting input is derived from
the 2.5-V output reference REFOUT of the THS1209 by using a resistor divider. Therefore, the op-amp output voltage
is centered at 2.5 V. The 10
F tantalum capacitor is required for bypassing REFOUT. REFIN of the THS1209 must
be connected directly to REFOUT in single-ended mode. The use of ratio matched, thin-film resistor networks
minimizes gain and offset errors.
_
+
5 V
R1
RS
3.5 V
2.5 V
1.5 V
THS1209
AINP
REFOUT
R2
1.25 V
1 V
0 V
–1 V
REFIN
+
C
10
F
Figure 35. Level-Shift for DC-Coupled Input
DIFFERENTIAL MODE OF OPERATION
For the differential mode of operation, a conversion from single-ended to differential is required. A conversion to
differential signals can be achieved by using an RF-transformer, which provides a center tap. Best performance is
achieved in differential mode.
THS1209
AINP
AINM
REFOUT
C
R
200
49.9
Mini Circuits
T4–1
+
10
F
Figure 36. Transformer Coupled Input
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| THS1209IDAG4 | 功能描述:模數(shù)轉換器 - ADC 12 Bit 8 MSPS Dual Ch RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| THS121 | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:HIGH STABILITY MOTOR CONTROL. DIGITAL TACHOMETER. CRANK SHAFT POSITION SENSOR. |
| THS1215 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3-V, 12-BIT, 15 MSPS, LOW-POWER ANALOG-TO-DIGITAL CONVERTER WITH POWER DOWN |
| THS1215CDW | 功能描述:模數(shù)轉換器 - ADC 12-Bit 15 MSPS w/Low Pwr & exc ENOB RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| THS1215CDWG4 | 功能描述:模數(shù)轉換器 - ADC 12-Bit 15 MSPS w/Low Pwr & exc ENOB RoHS:否 制造商:Texas Instruments 通道數(shù)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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