- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄98300 > TS8388BMFSB/QNB3 (ATMEL CORP) 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 PDF資料下載
參數(shù)資料
| 型號(hào)： | TS8388BMFSB/QNB3 |
| 廠(chǎng)商： | ATMEL CORP |
| 元件分類(lèi)： | ADC |
| 英文描述： | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
| 封裝： | CERAMIC, QFP-68 |
| 文件頁(yè)數(shù)： | 26/42頁(yè) |
| 文件大?。?/td> | 1307K |
| 代理商： | TS8388BMFSB/QNB3 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)當(dāng)前第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)
32
TS8388BFS
Product Specification
7.5.
NOISE IMMUNITY INFORMATIONS
Circuit noise immunity performance begins at design level.
Efforts have been made on the design in order to make the device as insensitive as possible to chip environment perturbations resulting from
the circuit itself or induced by external circuitry.
(Cascode stages isolation, internal damping resistors, clamps, internal (onchip) decoupling capacitors.)
Furthermore, the fully differential operation from analog input up to the digital outputs provides enhanced noise immunity by common mode
noise rejection.
Common mode noise voltage induced on the differential analog and clock inputs will be canceled out by these balanced differential amplifiers.
Moreover, proper active signals shielding has been provided on the chip to reduce the amount of coupled noise on the active inputs :
The analog inputs and clock inputs of the TS8388BFS device have been surrounded by ground pins, which must be directly connected to the
external ground plane.
7.6.
DIGITAL OUTPUTS
The TS8388BFS differential output buffers are internally 75 ohms loaded. The 75 ohms resistors are connected to the digital ground pins
through a -0.8v level shift diode (see Figures 3,4,5 on next page).
The TS8388BFS output buffers are designed for driving 75 ohms (default) or 50 ohms properly terminated impedance lines or coaxial cables.
An 11 mA bias current flowing alternately into one of the 75 ohms resistors when switching ensures a 0.825 V voltage drop across the resistor
(unterminated outputs).
The VPLUSD positive supply voltage allows the adjustment of the output common mode level from -1.2V (VPLUSD=0V for ECL output
compatibility) to +1.2V (VPLUSD=2.4V for LVDS output compatibility).
Therefore, the single ended output voltages vary approximately between -0.8V and -1.625V, ( outputs unterminated ), around -1.2V common
mode voltage.
Three possible line driving and back-termination scenarios are proposed (assuming VPLUSD=0V) :
1 ) 75 Ohms impedance transmission lines, 75 ohms differentially terminated (Fig. 3) :
Each output voltage varies between -1V and -1.42V (respectively +1.4V and +1V), leading to +/- 0.41V =0.825 V in differential, around -1.21 V
(respectively +1.21V) common mode for VPLUSD=0V (respectively 2.4V).
2 ) 50 ohms impedance transmission lines, 50 ohms differentially termination (Fig. 4) :
Each output voltage varies between -1.02V and -1.35V (respectively +1.38V and +1.05V), leading to +/- 0.33V=660 mV in differential, around -
1.18V (respectively +1.21V) common mode for VPLUSD=0V (respectively 2.4V).
3 ) 75 ohms impedance open transmission lines (Fig. 5) :
Each output voltage varies between -1.6 V and -0.8 V (respectively +0.8V and +1.6V), which are true ECL levels, leading to +/- 0.8V=1.6V in
differential, around -1.2V (respectively +1.2V) common mode for VPLUSD=0V (respectively 2.4V).
Therefore, it is possible to drive directly high input impedance storing registers, without terminating the 75 ohms transmission lines.
In time domain, that means that the incident wave will reflect at the 75 ohms transmission line output and travel back to the generator ( i.e. the
75 ohms data output buffer ). As the buffer output impedance is 75 ohms, no back reflection will occur.
Note : This is no longer true if a 50 ohms transmission line is used, as the latter is not matching the buffer 75 ohms output impedance.
Each differential output termination length must be kept identical .
It is recommended to decouple the midpoint of the differential termination with a 10 nF capacitor to avoid common mode perturbation in case of
slight mismatch in the differential output line lengths.
Too large mismatches ( keep < a few mm ) in the differential line lengths will lead to switching currents flowing into the decoupling capacitor
leading to switching ground noise.
The differential output voltage levels ( 75 or 50 ohms termination ) are not ECL standard voltage levels, however it is possible to drive standard
logic ECL circuitry like the ECLinPS logic line from MOTOROLA.
At sampling rates exceeding 1GSPS, it may be difficult to trigger the HP16500 or any other Acquisition System with digital outputs.
It becomes necessary to regenerate digital data and Data Ready by means of external amplifiers, in order to be able to test the TS8388BFS at
its optimum performance conditions.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TS8388BMFSB/QNC2 | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
| TS8388BMFSB/QQB3 | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
| TS8388BMFSB/QQC1 | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
| TS8388BMFSB/QNC3 | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
| TS8388BMFSB/QQB1 | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS8388BVF | 制造商:e2v technologies 功能描述:ADC 8-BIT 1 GSPS - Trays |
| TS8388BVFS | 制造商:e2v technologies 功能描述:ADC 8-BIT 1 GSPS - Trays |
| TS8388BVGL | 制造商:e2v technologies 功能描述:ADC 8-BIT 1 GSPS - Trays |
| TS8388BVGL (+LID) | 制造商:e2v technologies 功能描述:ADC 8-BIT 1 GSPS - Trays |
| TS83C194 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:16-Bit Microcontroller |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。