Datasheet

Video
DAC
1.8VDAC
Shutdown
Control
+
75W
(4)
1.8V
Pull-up
10kW
100kW
(2)
3750W
(Seenote1)
G=5.2V/V
75W
TVDetect
TVDetect
GPIO
(3)
GPIO
OMAP3430
OPA362
TWL92230
872W
2.8V
10mV
+In
Out
V+
GND
Enable
R
SET
Two-Pole
Filter
RegulatorV
AUX
0.5VV
REF
OPA362
SBOS480 –SEPTEMBER 2009 ........................................................................................................................................................................................ www.ti.com
APPLICATION INFORMATION
consumption.
The OPA362 video amplifier has been optimized to fit
• A two-pole filter is incorporated for DAC signal
seamlessly with Texas Instruments’ OMAP343x
reconstruction.
multimedia processor. The following features have
• The OPA362 employs an internal level shift circuit
been integrated to provide excellent video
that avoids sync pulse clipping and allows
performance:
dc-coupled output.
• Internal gain setting resistors (G = 5.2V/V) reduce
• A shutdown feature reduces quiescent current to
the number of external components needed in the
less than 1.5μA—crucial for portable applications.
video circuit.
• Integration of the 872Ω video encoder load
Although the OPA362 is optimized for the OMAP343x
resistor and 3750Ω R
SET
resistor used by the
processor, it is also well-suited to interface with any
OMAP343x helps minimize the number of external
digital media processor that outputs a video signal on
components and also ensures excellent ratio and
the order of 0.4V
PP
to 0.5V
PP
.
temperature tracking. This feature helps to keep
Figure 18 shows a typical application drawing with
the overall gain accurate and stable over
the OMAP343x processor and the TWL92230 Energy
temperature.
Management Chip.
• TV-detection support in connection with an
OMAP343x multimedia processor. This feature
helps to automate start/stop operation of the
TV-out function and minimizes power
(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 an interrupt.
(4) External 75Ω resistor is necessary when driving 75Ω terminated loads.
Figure 18. Typical Application Using the OMAP343x and the TWL92230
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Product Folder Link(s): OPA362