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参数资料
| 型号： | THS0842IPFB |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 2-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封装： | GREEN, PLASTIC, TQFP-48 |
| 文件页数： | 13/30页 |
| 文件大小： | 503K |
| 代理商： | THS0842IPFB |
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THS0842
DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER
WITH SINGLE OR DUAL PARALLEL BUS OUTPUT
SLAS246A – DECEMBER 1999 – REVISED AUGUST 2000
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
analog input (continued)
1.5 V
I/Q+
1.5 + 0.25 V
I/Q+
1.5 – 0.25 V
Positive
Analog
Input
1.5 V
I/Q–
1.5 – 0.25 V
I/Q–
1.5 + 0.25 V
Negative
Analog
Input
0 V
+0.5 V
Differential
Input
–0.5 V
1.0 Vp–p
Figure 19. Differential Input Waveform With AVDD = 3 V
The analog input can be dc coupled (see Figure 21) as long as the inputs are within the analog input common
mode voltage range. For example (see Figure 21), V+ and V– are signals centered on GND with a peak-to-peak
voltage of 2 V, and the circuit in Figure 21 is used to interface it with the THS0842. Assume AVDD of the converter
is 3 V. Two problems have to be solved. The first is to shift CML from 0 V to 1.5 V (AVDD/2). To do that, a Vbias
voltage and an adequate ratio of R1 and R2 have to be selected. For instance, if Vbias = 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)) will
be 400
. The values can be changed to match any other input impedance. A capacitor, C, connected from I/Q
IN+ to I/Q IN– will help 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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS0842IPFBG4 | 功能描述:模数转换器 - ADC 8-Bit 40MSPS 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 |
| THS0842PFB | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER WITH SINGLE OR DUAL PARALLEL BUS OUTPUT |
| THS10 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:EURO TERMINAL BLOCKS |
| THS10064 | 制造商:TI 制造商全称:Texas Instruments 功能描述:10-BIT 6 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
| THS10064CDA | 功能描述:模数转换器 - ADC 10-Bit 6 MSPS Quad Ch DSP/uP Ifc 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 |
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