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參數資料
| 型號： | THS1215CDWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | GREEN, PLASTIC, SOIC-28 |
| 文件頁數： | 6/22頁 |
| 文件大小： | 391K |
| 代理商： | THS1215CDWR |
www.ti.com
VIN+
VIN
R1
R3
THS1215
AIN+
REFT
REFB
AIN
R2
VBIAS
V IN
AVDD
2
THS1215
AIN+
AIN
REFT
REFB
THS1215
SLAS292A – MARCH 2001 – REVISED MARCH 2004
of the converter is 3 V. Two problems have to be solved. The first is to shift common mode level (CML) from 0 V
to 1.5 V (AVDD/2). To do that, a V bias voltage and an adequate ratio of R1 and R2 have to be selected. For
instance, if V bias = AVDD = 3 V, then R1 = R2. The second is that the differential voltage has to be reduced from
4 V (2 x 2 V) to 1 V, and for that an attenuation of 4 to1 is needed. The attenuation is determined by the relation:
(R3||2R2)/((R3||2R2) + 2R1). One possible solution is R1 = R2 = R3 = 150
. In this case, moreover, the input
impedance (2R1 + (R3||2R2)) is 400
. The values can be changed to match any other input impedance. A
capacitor, C, connected from AIN+ to AIN- helps filter any high frequency noise on the inputs, also improving
performance. Note that the chosen value of capacitor C must take into account the highest frequency component
of the analog input signal.
Figure 18. DC-Coupled Differential Input Circuit
A single-ended source may give better overall system performance when it is converted to a differential signal
before driving the THS1215. The configuration in Figure 19 takes a VIN of 1 V and drives the 1:1 transformer
ratio so that value of AIN+ and AIN– converts to full-scale value at the ADC digital output. With VIN at –1 V the
value at AIN+ and AIN– converts to 0 at the ADC digital outputs.
Figure 19. Transformer Coupled Single-Ended Input
14
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS1215CDWRG4 | 功能描述:模數轉換器 - ADC 12-Bit 15 MSPS w/Low Pwr & exc ENOB 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 |
| THS1215CPW | 功能描述:模數轉換器 - ADC 12bit 15MSPS 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 |
| THS1215CPWG4 | 功能描述:模數轉換器 - ADC 12bit 15MSPS 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 |
| THS1215CPWR | 功能描述:模數轉換器 - ADC 12-Bit 15 MSPS w/Low Pwr & exc ENOB 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 |
| THS1215CPWRG4 | 功能描述:模數轉換器 - ADC 12-Bit 15 MSPS w/Low Pwr & exc ENOB 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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