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參數資料
| 型號： | TS8388BCG |
| 元件分類： | ADC |
| 英文描述： | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CBGA72 |
| 封裝： | CBGA-72 |
| 文件頁數： | 29/46頁 |
| 文件大小： | 499K |
| 代理商： | TS8388BCG |
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TS8388BG
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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 INFORMATION
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 per-
turbations 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 immu-
nity 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 shield 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 TS8388BG device have been surrounded by ground pins, which must be
directly connected to the external ground plane.
7.7.
DIGITAL OUTPUTS
The TS8388BG 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).
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