Datasheet
Video
DAC
1.8VDAC 0.5VV
REF
Two-Pole
Filter
Shutdown
Control
+
75W
1.8V
Pull-up
10kW
100kW
(2)
3750W
(Seenote1)
G=5.2V/V
75W
TVDetect
TVDetect
GPIO
(3)
GPIO
OMAP3430
OPA362
TWL92230
872W
RegulatorV
AUX
2.5Vor2.8V
10mV
R
SET
+In
Out
V+
GND
Enable
OPA362
SBOS480 –SEPTEMBER 2009 ........................................................................................................................................................................................
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(1) Closed when enabled during normal operation; open when shut down.
(2) Protects GPIO against overvoltage conditions during active video transmission.
(3) GPIO must be able to generate interrupt.
Figure 27. Using TV-Detect Signal to Disable/Enable the OPA362
Disabling the OPA362 also disconnects the internal • Automatic video start by polling the video line
feedback resistor path to GND, and therefore there is periodically.
no current flowing from the logic supply through the
• Automatic video stop if the TV (or other
pull-up resistor to GND if no video load is connected;
equipment) is disconnected.
this architecture helps to conserve battery life. The
Proper implementation allows to significantly simplify
typical leakage when the output is pulled high and
the user interface. For more information, see
OPA362 is disabled is approximately 300pA.
Application Report SBOA109, OPA361 and TV
The following functionality can be achieved by
Detection, available for download at www.ti.com.
implementing TV-detection:
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Product Folder Link(s): OPA362