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AD9984AKSTZ-170 Folha de dados(PDF) 10 Page - Analog Devices

Nome de Peças AD9984AKSTZ-170
Descrição Electrónicos  High Performance 10-Bit Display Interface
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Fabricante Electrônico  AD [Analog Devices]
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AD9984AKSTZ-170 Folha de dados(HTML) 10 Page - Analog Devices

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AD9984A
Rev. 0 | Page 10 of 44
Mnemonic
Function
Description
FILT
External Filter Connection
For proper operation, the pixel clock generator PLL requires an external filter. Connect the
filter shown in Figure 8 to this pin. For optimal performance, minimize noise and parasitics
on this node. For more information, see the PCB Layout Recommendations section.
HSOUT
Horizontal Sync Output
This pin is a reconstructed and phase-aligned version of the Hsync input. Both the
polarity and duration of this output can be programmed via serial bus registers. By
maintaining alignment with DATACK and the main data outputs (RED[9:0], GREEN[9:0],
BLUE[9:0]), data timing with respect to Hsync can always be determined.
VSOUT/A0
Vertical Sync Output
(VSOUT)
This pin has dual functionality.
VSOUT can either be a separated Vsync from a composite signal or a direct pass through
of the Vsync signal. The polarity of this output can be controlled via a serial bus bit. The
placement and duration in all modes can be set by the graphics transmitter or the
duration can be set by Register 0x14, Bit 1 and Register 0x15, Bits[7:0]. This VSOUT function
does not affect the A0 function.
Serial Port Address Input 0
(A0)
A0 selects the LSB of the serial port device address, allowing two parts from Analog
Devices, Inc., to be on the same serial bus. A high impedance (10 kΩ), external pull-up
resistor enables this pin to be read at power-up as 1. This A0 function does not interfere
with the VSOUT function. For more details on A0, see the description in the 2-Wire Serial
Control Port section.
SOGOUT
Sync-On-Green Slicer Output
This pin outputs one of four possible signals (controlled by Register 0x1D, Bits[1:0]): raw
SOGINx, raw HSYNCx, regenerated Hsync from the filter, or the filtered Hsync. See Figure 9
to view how this pin is connected. Other than slicing off SOG, the output from this pin
receives no additional processing on the AD9984A. Vsync separation is performed via the
sync separator.
O/E FIELD
Odd/Even Field Bit for
Interlaced Video
This output identifies whether the current field (in an interlaced signal) is odd or even.
SDA
Serial Port Data I/O
Data I/O for the I2C® serial port.
SCL
Serial Port Data Clock
Clock for the I2C serial port.
RED[9:0]
Data Output, Red Channel
GREEN[9:0]
Data Output, Green Channel
BLUE[9:0]
Data Output, Blue Channel
The main data outputs. Bit 9 is the MSB. The delay from pixel sampling time to output is
fixed. When the sampling time is changed by adjusting the phase register, the output
timing is shifted as well. The DATACK and HSOUT outputs are also moved to maintain the
timing relationship among the signals.
DATACK
Data Clock Output
This is the main clock output signal used to strobe the output data and HSOUT into
external logic. Four possible output clocks can be selected with Register 0x20, Bits[7:6].
Three of these are related to the pixel clock (pixel clock, 90° phase-shifted pixel clock,
and 2× frequency pixel clock). They are produced by the internal PLL clock generator or
by EXTCK, and are synchronous with the pixel sampling clock. The fourth option for the
data clock output is an internally generated 0.5× pixel clock. The sampling time of the
internal pixel clock can be changed by adjusting the phase register (Register 0x04).
When this is changed, the pixel-related DATACK timing is also shifted. The data (RED[9:0],
GREEN[9:0], BLUE[9:0]), DATACK, and HSOUT outputs are moved to maintain the timing
relationship among the signals.
VD (1.8 V)
Main Power Supply
These pins supply power to the main elements of the circuit. They should be as quiet
and as filtered as possible.
VDD (1.8 V to 3.3 V)
Digital Output Power Supply
A large number of output pins (up to 35) switching at high speed (up to 170 MHz) generates
large amounts of power supply transients (noise). These supply pins are identified separately
from the VD pins. As a result, special care must be taken to minimize output noise transferred
into the sensitive analog circuitry. If the AD9984A is interfacing with lower voltage logic,
VDD can be connected to a lower supply voltage (as low as 1.8 V) for compatibility.
PVD (1.8 V)
Clock Generator Power
Supply
The most sensitive portion of the AD9984A is the clock generation circuitry. These pins
provide power to the clock PLL and help the user design for optimal performance. The
designer should provide quiet, noise-free power to these pins.
DAVDD (1.8 V)
Digital Input Power Supply
This supplies power to the digital logic. It is recommended to connect this pin to
the VD supply.
GND
Ground
The ground return for all on-chip circuitry. It is recommended that the AD9984A be
assembled on a single solid ground plane with careful attention to ground current paths.


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