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參數(shù)資料
| 型號(hào)： | OPA623 |
| 英文描述： | Wide Bandwidth, Current-Feedback OPERATIONAL AMPLIFIER |
| 中文描述： | 寬帶，電流反饋運(yùn)算放大器 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大小： | 254K |
| 代理商： | OPA623 |
13
OPA623
APPLICATIONS INFORMATION
The precise pulse response and high slew rate enables the
OPA623 to be used in digital communication systems.
Figure 12 shows the circuit schematic of an output amplifier
with a gain of +2V/V, which can drive a 75
coaxial cable
with a high-speed data stream of 140Mbit/s. Figure 13, for
a binary 0, and Figure 14, for a binary 1, shows the pulse
masks of the CCITT recommendation G.703 and the corre-
sponding pulse responses of the OPA623. The signal code at
the file rate of 139.264Mbit/s is CMI, the signal amplitude
is 1Vp-p with
±
11dB amplitude limits. Naturally, the OPA623
can also be used for HDB3 encoded 34Mbit/s,155Mbit/s,
STM-1, and 155Mbit/s B-ISDN transmission systems.
FIGURE 12. Driver Amplifier for a Digital 140Mbit/s
Transmission system.
FIGURE 13. Mask of a Pulse Corresponding to a Binary 0 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
0.1ns
Nominal
zero level
(2)
= Note 1.
Negative
transitions
Positive transition
at mid-unit interval
1ns
1ns
1ns
1.795ns
1.795ns
T = 7.18ns
1.795ns
1ns
0.1ns
1ns
1.795ns
Nominal
Pulse
0.1ns
0.35ns
0.35ns
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.
OPA623
R
2
R
1
300
R
IN
6
V
OUT
300
180
–V
CC
+V
CC
4
7
2
3
–In
+In
V
IN
G = 1 + R
2
/R
1
= +2V/V
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