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参数资料
| 型号： | THS1009IDA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 2-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| 封装： | GREEN, PLASTIC, TSSOP-32 |
| 文件页数： | 20/30页 |
| 文件大小： | 294K |
| 代理商： | THS1009IDA |
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THS1009
SLAS287A – AUGUST 2000 – REVISED DECEMBER 2002
www.ti.com
27
SINGLE-ENDED MODE OF OPERATION
The THS1009 can be configured for single-ended operation using dc or ac coupling. In either case, the input of the
THS1009 should be driven from an operational amplifier that does not degrade the ADC performance. Because the
THS1009 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.
DC COUPLING
An operational amplifier can be configured to shift the signal level according to the analog input voltage range of the
THS1009. The analog input voltage range of the THS1009 goes from 1.5 V to 3.5 V. An operational amplifier can
be used as shown in Figure 35.
Figure 35 shows an example with the analog input signal in the range between –1 V and 1 V. The signal is shifted
by an operational amplifier to the analog input range of the THS1009 (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 THS1009 by using a resistor divider. Therefore, the
operational amplifier output voltage is centered at 2.5 V. The 10
F tantalum capacitor is required for bypassing
REFOUT. REFIN of the THS1009 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
THS1009
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.
THS1009
AINP
AINM
REFOUT
C
R
200
49.9
Mini Circuits
T4–1
+
10
F
Figure 36. Transformer Coupled Input
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| THS1009IDAG4 | 功能描述:模数转换器 - ADC 10-Bit 8 MSPS Dual Ch RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| THS1009IDAR | 制造商:TI 制造商全称:Texas Instruments 功能描述:10-BIT, 2 ANALOG INPUT, 8 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
| THS1009IDARG4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:10-BIT, 2 ANALOG INPUT, 8 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
| THS10100RJ | 功能描述:线绕电阻器 - 底架安装 100 Ohms 10W 50PPM RoHS:否 制造商:Vishay/Dale 电阻:7 Ohms 容差:1 % 功率额定值:100 W 温度系数:50 PPM / C 系列:RH 工作温度范围:- 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 封装:Bulk 产品:Power Resistors Wirewound Aluminum Housed |
| THS10100RJ | 制造商:TE Connectivity 功能描述:RESISTOR WIREWOUND 100OHM 10W 5% |
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