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參數資料
| 型號： | TS8388BVFS9NC1ZB9 |
| 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： | CERAMIC, QFP-68 |
| 文件頁數： | 25/43頁 |
| 文件大小： | 825K |
| 代理商： | TS8388BVFS9NC1ZB9 |
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TS8388BFS
31/42
Preliminary Beta Site
7.4.3.
SINGLE ENDED ECL CLOCK INPUT
In single–ended configuration enter on CLK ( resp. CLKB ) pin , with the inverted phase Clock input pin CLKB (respectively CLK) connected to -
1.3V through the 50 ohms termination resistor.
The inphase input amplitude is 1 Volt peak to peak, centered on -1.3 Volt common mode.
Single ended Clock input (ECL):
VCLK common mode = -1.3 Volt.
VCLKB = -1.3 Volt
-0.8V
[V]
t
-1.8V
VCLK
VCLKB = -1.3 V
7.5.
CLOCK SIGNAL DUTY CYCLE ADJUST
At fast sampling rates, ( 1 GSPS and above), the device performance ( especially the SNR ) may be improved by tuning the Clock duty cycle
(CLK,CLKB).
In single ended configuration, when using a sinewave clock generator, the clock signal duty cycle can be easily adjusted by simply offseting the
inphase clock signal using a biasing tee, (as the out of phase clock input is at ground level ).
Single ended Clock input (Inphase clock input common mode shifted)
VCLK common mode = -180mV
VCLKB = 0 Volt
[V]
t
VCLK - 180 mV
VCLKB = ( 0 V )
-0.5V
40 %
60 %
+0.5V
Note 1 : Do not exceed 10 dBm into the 50 ohms termination resistor for single clock input power level.
Note 2 : For an input CLK signal of 4 dBm into 50 ohms, the typical offset value to achieve a 40 / 60 clock duty cycle is -180 mV on CLK.
7.6.
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.
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