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參數(shù)資料
| 型號(hào)： | TSEV8388BFZA2 |
| 廠商： | Atmel Corp. |
| 元件分類： | ADC |
| 英文描述： | ADC 8-bit 1 GSPS |
| 中文描述： | ADC的8位1 GSPS的 |
| 文件頁數(shù)： | 31/57頁 |
| 文件大?。?/td> | 1276K |
| 代理商： | TSEV8388BFZA2 |
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31
TS8388B
2144C–BDC–04/03
No performance degradation (i.e.: due to timing jitter) is observed in this particular single-
ended configuration up to 1.2 GSPS Nyquist conditions (F
IN
= 600 MHz).
This is true so long as the inverted phase clock input pin is 50
terminated very closely to one
of the neighboring shield ground pins, which constitutes the local Ground reference for the
inphase clock input.
Thus the TS8388B differential clock input buffer will fully reject the local ground noise (and any
capacitively and inductively coupled noise) as common mode effects. Moreover, a very low
phase noise sinewave generator must be used for enhanced jitter performance.
The typical inphase clock input amplitude is 1V peak to peak, centered on 0V (ground) com-
mon mode. This corresponds to a typical clock input power level of 4 dBm into the 50
termination resistor. Do not exceed 10 dBm to avoid saturation of the preamplifier input
transistors.
The inverted phase clock input is grounded through the 50
termination resistor.
Figure 31.
Single-ended Clock Input (Ground common mode):
VCLK Common Mode = 0V; VCLKB = 0V; 4 dBm Typical Clock Input Power Level (into 50
termination resistor)
Note:
Do not exceed 10 dBm into the 50
termination resistor for single clock input power level.
Differential ECL Clock
Input
The clock inputs can be driven differentially with nominal -0.8V/-1.8V ECL levels.
In this mode, a low phase noise sinewave generator can be used to drive the clock inputs, fol-
lowed by a power splitter (hybrid junction) in order to obtain 180 degrees out of phase
sinewave signals. Biasing tees can be used for offseting the common mode voltage to ECL
levels.
Note: As the biasing tees propagation times are not matching, a tunable delay line is required
in order to ensure the signals to be 180 degrees out of phase especially at fast clock rates in
the GSPS range.
Figure 32.
Differential Clock Inputs (ECL Levels)
50
(external or
on package)
1 M
0.4 pF
-0.5V
+0.5V
t
[V]
VCLK
CLK or CLKB double pad (pins 37, 38 or 39, 40)
CLK or CLKB
50
reverse termination
VCLK = 0V
VCLK
50
(external or
on package)
1 M
0.4 pF
CLK or CLKB double pad (pins 37, 38 or 39, 40)
CLK or CLKB
-2V
50
reverse termination
-1.8V
-0.8V
[mV]
VCLK
t
VCLKB
Common mode = -1.3V
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