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參數資料
| 型號： | THS1009IDA |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 2-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| 封裝： | GREEN, PLASTIC, TSSOP-32 |
| 文件頁數： | 19/30頁 |
| 文件大小： | 294K |
| 代理商： | THS1009IDA |
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THS1009
SLAS287A – AUGUST 2000 – REVISED DECEMBER 2002
www.ti.com
26
ANALOG INPUT CONFIGURATION AND REFERENCE VOLTAGE
The THS1009 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 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
10-Bit
ADC
VREFP
VREFM
AINP
Figure 33. Single-Ended Input Stage
A differential operation is desired for many applications due to better signal-to-noise ration. 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 THS1009 offers 1 differential analog input and in the single-ended mode
2 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.
10-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
(1)
(2)
(3)
(4)
(5)
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| THS1009IDAG4 | 功能描述:模數轉換器 - ADC 10-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 |
| THS1009IDAR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT, 2 ANALOG INPUT, 8 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
| THS1009IDARG4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT, 2 ANALOG INPUT, 8 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
| THS10100RJ | 功能描述:線繞電阻器 - 底架安裝 100 Ohms 10W 50PPM RoHS:否 制造商:Vishay/Dale 電阻:7 Ohms 容差:1 % 功率額定值:100 W 溫度系數:50 PPM / C 系列:RH 工作溫度范圍:- 55 C to + 250 C 尺寸:46.02 mm Dia. x 46.02 mm W x 88.9 mm L x 44.45 mm H 封裝:Bulk 產品:Power Resistors Wirewound Aluminum Housed |
| THS10100RJ | 制造商:TE Connectivity 功能描述:RESISTOR WIREWOUND 100OHM 10W 5% |
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