OPA354-Q1_15 Datasheet, PDF (14/36 Pages) Texas Instruments – OPAx354-Q1 250-MHz, Rail-to-Rail I/O, CMOS Operational Amplifiers

OPA354-Q1, OPA2354-Q1, OPA4354-Q1
SBOS492B – JUNE 2009 – REVISED DECEMBER 2014
Feature Description (continued)
R₁
100k W
R₃
100k W
+
-
2V In = 200mA
Out, as Shown
R₂
10k W
C₁
200pF
+5V
1mF
R₅
1W
OPA2354-Q1
R₆
1W
OPA2354-Q1
R₄
10k W
R_SHUNT
1W
Laser Diode
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Figure 31. Parallel Operation
The OPAx354-Q1 family of devices provides peak currents up to 200 mA, which corresponds to the typical short-
circuit current. Therefore, an on-chip thermal shutdown circuit protects the OPAx354-Q1 family of devices from
dangerously high junction temperatures. At 160°C, the protection circuit shuts down the amplifier. Normal
operation resumes when the junction temperature cools below 140°C.
7.3.5 Video
The OPAx354-Q1 output stage is capable of driving standard back-terminated 75-Ω video cables (see
Figure 32). A back-terminated transmission line does not exhibit a capacitive load to its driver. A properly back-
terminated 75-Ω cable does not appear as capacitance; it presents only a 150-Ω resistive load to the OPAx354-
Q1 output.
+5V
Video
In
75W
OPA354-Q1
75W
Video
Output
+2.5V
+2.5V
604W
604W
Figure 32. Single-Supply Video Line Driver
A use of the OPAx354-Q1 family of devices is as an amplifier for RGB graphic signals, which have a voltage of
zero at the video black level, by offsetting and ac-coupling the signal (see Figure 33).
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