- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98216 > THS0842IPFB (TEXAS INSTRUMENTS INC) 2-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 PDF資料下載
參數(shù)資料
| 型號： | THS0842IPFB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 2-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | GREEN, PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 13/30頁 |
| 文件大小： | 503K |
| 代理商： | THS0842IPFB |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁當前第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| THS0842IPFBG4 | 2-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| THS10064CDA | 4-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| THS10064IDA | 4-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| THS10064CDAR | 4-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| THS10064IDAR | 4-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS0842IPFBG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 40MSPS Dual Ch RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| THS0842PFB | 制造商:TI 制造商全稱: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:未知廠家 制造商全稱:未知廠家 功能描述:EURO TERMINAL BLOCKS |
| THS10064 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT 6 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
| THS10064CDA | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 6 MSPS Quad Ch DSP/uP Ifc RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。