adv7718 Analog Devices, Inc., adv7718 Datasheet - Page 9

• Manufacturer Part Number: adv7718
• Description: Integrated Digital Ccir-601 Pal/ntsc Video Encoder
• Manufacturer: Analog Devices, Inc.

ABSOLUTE MAXIMUM RATINGS
V
Voltage on Any Digital Input Pin . . GND – 0.5 V to V
Storage Temperature (T
Junction Temperature (T
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . . 260°C
Analog Outputs to GND
NOTES
1
2
Model
ADV7178KS
ADV7177KS
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADV7177/ADV7178 feature proprietary ESD protection circuitry, permanent
damage may occur on devices subjected to high-energy electrostatic discharges. Therefore,
proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
(continued from page 1)
compatible with worldwide standards. The 4:2:2 YUV video data
is interpolated to two times the pixel rate. The color-difference
components (UV) are quadrature modulated using a subcarrier
frequency generated by an on-chip 32-bit digital synthesizer
(also running at two times the pixel rate). The two times pixel
rate sampling allows for better signal-to-noise ratio. A 32-bit
DDS with a 9-bit look-up table produces a superior subcarrier in
terms of both frequency and phase. In addition to the composite
output signal, there is the facility to output S-Video (Y/C) video,
YUV or RGB video.
Each analog output is capable of driving the full video-level
(34.7 mA) signal into an unbuffered, doubly terminated 75 Ω load.
With external buffering, the user has the additional option to scale
back the DAC output current to 5 mA min, thereby significantly
reducing the power dissipation of the device.
The ADV7177/ADV7178 also supports both PAL and NTSC
square pixel operation.
Stresses above those listed under Absolute Maximum Ratings may cause permanent
Analog output short circuit to any power supply or common can be of an
damage to the device. This is a stress rating only; functional operation of the device
at these or any other conditions above those listed in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
indefinite duration.
AA
to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Temperature Package
Range
0°C to 70°C
0°C to 70°C
ORDERING GUIDE
S
2
) . . . . . . . . . . . . . . –65°C to +150°C
J
) . . . . . . . . . . . . . . . . . . . . . . . 150°C
. . . . . . . . . . . . GND – 0.5 V to V
Description
Plastic Quad Flatpack S-44
Plastic Quad Flatpack S-44
1
AA
Package
Option
+ 0.5 V
AA
PACKAGE THERMAL PERFORMANCE
The 44-lead PQFP package used for this device has a junction-
to-ambient thermal resistance (θ
PCB of 53.2°C/W. The junction-to-case thermal resistance (θ
is 18.8°C/W.
Care must be taken when operating the part in certain condi-
tions to prevent overheating. Table I illustrates what conditions
are to be used when using the part.
Condition
3 DACs ON, Double 75R
3 DACs ON, Low Power
3 DACs ON, Buffered
2 DACs ON, Double 75R
2 DACs ON, Low Power
2 DACs ON, Buffered
NOTES
1
2
3
The output video frames are synchronized with the incoming data
timing reference codes. Optionally, the encoder accepts (and can
generate) HSYNC, VSYNC, and FIELD timing signals. These
timing signals can be adjusted to change pulsewidth and position
while the part is in the master mode. The encoder requires a
single two times pixel rate (27 MHz) clock for standard operation.
Alternatively, the encoder requires a 24.5454 MHz clock for
NTSC or 29.5 MHz clock for PAL square pixel mode operation.
All internal timing is generated on-chip.
The ADV7177/ADV7178 modes are set up over a two-wire serial
bidirectional port (I
Functionally the ADV7178 and ADV7177 are the same with the
exception that the ADV7178 can output the Macrovision anticopy
algorithm, and OSD is only supported on the ADV7177.
The ADV7177/ADV7178 is packaged in a 44-lead thermally
enhanced PQFP package.
DAC ON, Double 75R refers to a condition where the DACs are terminated
DAC ON, Low Power refers to a condition where the DACs are terminated in a
DAC ON, Buffered refers to a condition where the DAC current is reduced to
into a double 75R load and low power mode is disabled.
double 75R load and low power mode is enabled.
5 mA and external buffers are used to drive the video loads.
Table I. Allowable Operating Conditions for ADV7177/
ADV7178 in 44-Lead PQFP Package
2
C-Compatible) with two slave addresses.
3
2
1
ADV7177/ADV7178
JA
WARNING!
) in still air on a four-layer
5 V
No
Yes
Yes
No
Yes
Yes
ESD SENSITIVE DEVICE
3 V
Yes
Yes
Yes
Yes
Yes
Yes
JC
)