|ADV7182||10-Bit, SDTV Video Decoder with Differential Inputs|
|ADV7182 Datasheet PDF : 96 Pages |
POWER SUPPLY SEQUENCING
The recommended power-up sequence of the ADV7182 is
1. 3.3 V supply (DVDDIO)
2. 1.8 V supplies (DVDD, PVDD, AVDD)
Note the following:
Power up the DVDDIO supply first. This is true regardless
if DVDDIO is powered up to 3.3 V or 1.8 V.
Power up the 1.8 V supplies only after DVDDIO has been
Assert (pull low) the PWRDWN and RESET pins while the
supplies are being powered up. A 5 ms reset operation is
needed after power-up. See the Power-On RESET section
for further details.
After all the power supplies and the PWRDWN and
RESET pins are powered-up and stable, a further 5 ms
delay is needed before I2C communication can be
performed with the ADV7182.
During power-up, all supplies must adhere to the
specifications listed in the Absolute Maximum Ratings
The ADV7182 can be alternatively powered up by asserting all
supplies simultaneously. In this case, care must be taken to
ensure that a lower rated supply does not go above a higher
rated supply level as the supplies are being established.
After power-up, it is necessary to execute a reset operation. For
correct operation, RESET should remain asserted (pulled low)
for 5 ms after power supplies are stable and within specification,
and PWRDWN is deasserted (pulled high).
The ADV7182 supplies can be deasserted simultaneously as long
as DVDDIO does not go below a lower rated supply.
UNIVERSAL POWER SUPPLY
It is possible to power all the supplies (DVDD, PVDD, AVDD,
and DVDDIO) to 1.8 V.
In this setup, note the following:
Follow the power-up sequence described in the Power
Supply Sequencing section. Power up the DVDDIO supply
to 1.8 V instead of 3.3 V. Also, power up the PWRDWN
and RESET pins to 1.8 V instead of 3.3 V.
Set the drive strengths of the digital outputs of the
ADV7182 to their maximum setting. See the Global Pin
Connect any pull-up resistors connected to pins on the
ADV7182 (such as the SCLK and SDATA pins) to 1.8 V
and not 3.3 V.
Figure 5. Recommended Power-Up Sequence
Rev. A | Page 11 of 96
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