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| 型號： | OPA623AU |
| 英文描述： | Wide Bandwidth, Current-Feedback OPERATIONAL AMPLIFIER |
| 中文描述： | 寬帶，電流反饋運算放大器 |
| 文件頁數(shù)： | 14/15頁 |
| 文件大小： | 254K |
| 代理商： | OPA623AU |
14
OPA623
FIGURE 14. Mask of a Pulse Corresponding to a Binary 1 per CCITT Recommendation G.703.
0.60
0.55
0.50
0.45
0.40
0.05
–0.05
–0.40
–0.45
–0.50
–0.55
–0.60
V
1ns
0.1ns
Nominal
zero level
(2)
= Note 1.
Negative
transition
Positive transition
1ns
1ns
1.795ns
T = 7.18ns
1.795ns
3.59ns
1.35ns
1.35ns
3.59ns
1ns
0.5ns
Nominal
Pulse
0.5ns
0.1ns
NOTE: (1) The maximum “steady state” amplitude should not exceed the 0.55V limit. Overshoots and other transients are permitted to
fall into the dotted area, bounded by the amplitude levels 0.55V and 0.6V, provided that they do not exceed the steady state level by
more than 0.05V. The possibility of relaxing the amount by which the overshoot may exceed the steady state level is under study.
(2) For all measurements using these masks, the signal should be AC coupled, using a capacitor of not less than 0.01μF, to the input of
the oscilloscope used for measurements.
The nominal zero level for both masks should be aligned with the oscilloscope trace with no input signal. With the signal then applied,
the vertical position of the trace can be adjusted with the objective of meeting the limits of the masks. Any such adjustment should be
the same for both masks and should not exceed
±
0.05V. This may be checked by removing the input signal again and verifying that the
trace lies within
±
0.05V of the nominal zero level of masks.
(3) Each pulse in a coded pulse sequence should meet the limits of the relevant mask, irrespective of the state of the preceding and
succeeding pulses. For actual verification, if a 139264kHz timing signal associated with the source of the interface signal is available, its
use as a timing reference for an oscilloscope is preferred. Otherwise, compliance with the relevant mask may be tested by means of all-
0s and all-1s signals, respectively. (In practice, the signal may contain frame alignment bits per Rec. G.751.)
(4) For the purpose of these masks, the rise time and decay time should be measured between –0.4V and 0.4V, and should not exceed
2ns.
(5) The inverse pulse will have the same characteristics. Note that the timing tolerance at the zero level of the negative and positive
transitions are ±0.1ns and ±0.5n, respectively.
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