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參數資料
| 型號： | THS1209CDA |
| 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： | 21/33頁 |
| 文件大小： | 312K |
| 代理商： | THS1209CDA |
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THS1209
SLAS288B – JULY 2000 – REVISED DECEMBER 2002
www.ti.com
28
ANALOG INPUT CONFIGURATION AND REFERENCE VOLTAGE
The THS1209 features two analog input channels. These can be configured for either single-ended or differential
operation. Figure 33 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 voltage). The analog
input voltage range goes from 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. 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 33. Single-Ended Input Stage
A differential operation is desired for many applications due to a better signal-to-noise ratio. Figure 34 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 the single-ended mode and is therefore
recommended for best performance. The THS1209 offers 1 differential analog input and in the single-ended mode
2 analog inputs. If the analog input architecture id 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 34. 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)
An 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
SINGLE-ENDED MODE OF OPERATION
The THS1209 can be configured for single-ended operation using dc or ac coupling. In every case, the input of the
THS1209 should be driven from an operational amplifier that does not degrade the ADC performance. Because the
THS1209 operates from a 5-V single supply, it is necessary to level-shift ground-based bipolar signals to comply with
its input requirements. This can be achieved with dc- and ac-coupling.
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相關代理商/技術參數 |
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| THS1209CDAG4 | 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 |
| THS1209IDA | 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 |
| THS1209IDAG4 | 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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| 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 |
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