參數(shù)資料
型號(hào)： TS(X)8387CF_
廠商： ATMEL CORP
元件分類： ADC
英文描述： 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68
封裝： 24 X 24 MM, CERAMIC, QFP-68
文件頁(yè)數(shù)： 22/38頁(yè)
文件大?。?/td> 617K
代理商： TS(X)8387CF_
TS8387
29/38
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 TS8387 chip have been surrounded by ground pads, which must be directly
connected to the external ground plane.
7.6.
DIGITAL OUTPUTS
The TS8387 differential output buffers are internally 75 ohms loaded. The 75 ohms resistors are connected to the digital
ground pads through a –0.8v level shift diode.
(See Figure below).
The TS8387 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.
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 :
1 ) 75 Ohms impedance transmission lines, 75 ohms differentialy terminated (Fig. 3) :
Each output voltage varies between –1V and –1.42V , leading to +/– 0.41V =0.825 Volt in differential, around –1.21 V
common mode.
2 ) 50 ohms impedance transmission lines, 50 ohms differentialy termination (Fig. 4) :
Each output voltage varies between –1.02V and –1.35V , leading to +/– 0.33V=660 mV in differential, around –1.18V
common mode.
3 ) 75 ohms impedance open transmission lines (Fig. 5) :
Each output voltage varies between –1.6 V and –0.8 V , which are true ECL levels.
Therefore, it is possible to drive directly high input impedance storing registers, without terminating the 75 ohms trans-
mission 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.
相關(guān)PDF資料
PDF描述
TS8387VF 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68
TS8387VF 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68
TS8387MF 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68
TS8387VF_ 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68
TS12A4516P 1-CHANNEL, SGL POLE SGL THROW SWITCH, PDIP8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TSX-8A16MHZ 制造商:Epson Electronics America Inc 功能描述:CODE BCAI
TSX920ILT 功能描述:General Purpose Amplifier 1 Circuit Rail-to-Rail SOT-23-6 制造商:stmicroelectronics 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 壓擺率:17 V/μs 增益帶寬積:10MHz -3db 帶寬:- 電流 - 輸入偏置:10pA 電壓 - 輸入失調(diào):4mV 電流 - 電源:2.9mA 電流 - 輸出/通道:74mA 電壓 - 電源，單/雙（±）:4 V ~ 16 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商器件封裝:SOT-23-6 標(biāo)準(zhǔn)包裝:1
TSX921ILT 制造商:STMicroelectronics 功能描述:ANALOG AND AUDIO SYSTEMS - Tape and Reel 制造商:STMicroelectronics 功能描述:ANALOG and AUDIO SYSTEMS
TSX921IYLT 制造商:STMicroelectronics 功能描述:IC OPAMP R-R 10MHZ SOT23-5
TSX922IDT 功能描述:General Purpose Amplifier 2 Circuit Rail-to-Rail 8-SO 制造商:stmicroelectronics 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 壓擺率:17 V/μs 增益帶寬積:10MHz -3db 帶寬:- 電流 - 輸入偏置:10pA 電壓 - 輸入失調(diào):4mV 電流 - 電源:2.8mA 電流 - 輸出/通道:74mA 電壓 - 電源，單/雙（±）:4 V ~ 16 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商器件封裝:8-SO 標(biāo)準(zhǔn)包裝:1
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*