AD9380/PCB Analog Devices Inc, AD9380/PCB Datasheet - Page 43

• Manufacturer Part Number: AD9380/PCB
• Description: BOARD EVALUATION FOR AD9380
• Manufacturer: Analog Devices Inc

Specifications of AD9380/PCB

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

0x25—Bits[5:4] Output Drive Strength
These two bits select the drive strength for all the high speed
digital outputs (except VSOUT, A0, and O/E field). Higher
drive strength results in faster rise/fall times and in general
makes it easier to capture data. Lower drive strength results in
slower rise times/fall times and helps to reduce EMI and
digitally generated power supply noise. The power-up default
setting is 11.
Table 18. Output Drive Strength
Output Drive
00
01
10
11
0x25—Bits[3:2] Output Mode
These bits choose between four options for the output mode,
one of which is exclusive to an HDMI input. 4:4:4 mode is
standard RGB; 4:2:2 mode is YCrCb, which reduces the number
of active output pins from 24 to 16; 4:4:4 is double data rate
(DDR) output mode; and the data is RGB mode, but changes on
every clock edge. The power-up default setting is 00.
Table 19. Output Mode
Output Mode
00
01
10
11
0x25—Bit[1] Primary Output Enable
This bit places the primary output in active or high impedance
mode.
The primary output is designated when using either 4:2:2 or
DDR 4:4:4. In these modes, the data on the red and green
output channels is the primary output, while the output data
on the blue channel (DDR YCrCb) is the secondary output.
0 = primary output is in high impedance mode. 1 = primary
output is enabled. The power-up default setting is 1.
0x25—Bit[0] Secondary Output Enable
This bit places the secondary output in active or high
impedance mode.
The secondary output is designated when using either 4:2:2 or
DDR 4:4:4. In these modes, the data on the blue output channel
is the secondary output, while the output data on the red and
green channels is the primary output. Secondary output is
always a DDR YCrCb data mode. 0 = secondary output is in
high impedance mode. 1 = secondary output is enabled. The
power-up default setting is 0.
Result
4:4:4 RGB mode
4:2:2 YCrCb mode + DDR 4:2:2 on blue
(secondary)
DDR 4:4:4: DDR mode + DDR 4:2:2 on blue
(secondary)
12-bit 4:2:2 (HDMI option only)
Result
Low output drive strength
Medium low output drive strength
Medium high output drive strength
High output drive strength
Rev. 0 | Page 43 of 60
0x26—Bit[7] Output Three-State
When enabled, this bit puts all outputs (except SOGOUT) in a
high impedance state. 0 = normal outputs. 1 = all outputs
(except SOGOUT) in high impedance mode. The power-up
default setting is 0.
0x26—Bits[6] SOG Three-State
When enabled, this bit allows the SOGOUT pin to be placed in
a high impedance state. 0 = normal SOG output. 1 = SOGOUT
pin is in high impedance mode. The power-up default setting
is 0.
0x26—Bits[5] S/PDIF Three-State
When enabled, this bit places the S/PDIF audio output
pins in a high impedance state. 0 = normal S/PDIF output.
1 = S/PDIF pins in high impedance mode. The power-up
default setting is 0.
0x26—Bits[4] I
When enabled, this bit places the I
impedance state. 0 = normal I
impedance mode. The power-up default setting is 0.
0x26—Bits[3] Power-Down Polarity
This bit defines the polarity of the input power-down pin.
0 = power-down pin is active low. 1 = power-down pin is active
high. The power-up default setting is 1.
0x26—Bits[2:1] Power-Down Pin Function
These bits define the different operational modes of the power-
down pin. These bits are functional only when the power-down
pin is active; when it is not active, the part is powered up and
functioning. The power-up default setting is 00.
Table 20. Power-Down Pin Function
Function
00
01
10
11
0x26—Bit[0] Power-Down
This bit is used to put the chip in power-down mode. In this
mode, the chip’s power dissipation is reduced to a fraction of
the typical power (see Table 1 for exact power dissipation).
When in power-down, the HSOUT, VSOUT, DATACK, and
all 30 of the data outputs are put into a high impedance state.
Note that the SOGOUT output is not put into high impedance.
Circuit blocks that continue to be active during power-down
include the voltage references, sync processing, sync detection,
and the serial register. These blocks facilitate a fast start-up
from power-down. 0 = normal operation. 1 = power-down
mode. The power-up default setting is 0.
Result
The chip is powered down and all outputs except
SOGOUT are in high impedance mode.
The chip is powered down and all outputs are in
high impedance mode.
The chip remains powered up, but all outputs
except SOGOUT are in high impedance mode.
The chip remains powered up, but all outputs are
in high impedance mode.
2
S Three-State
2
S output. 1 = I
2
S output pins in a high
2
S pins in high
AD9380