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參數(shù)資料
| 型號： | EVAL-AD9393-AKZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 39/40頁 |
| 文件大小： | 0K |
| 描述： | EVAL KIT 9393 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 視頻，開關(guān)，HDMI |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD9393 |
| 已供物品： | 板 |
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AD9393
Rev. 0 | Page 8 of 40
DESIGN GUIDE
GENERAL DESCRIPTION
The AD9393 is a fully integrated solution for receiving DVI/
HDMI signals and is capable of decoding HDCP-encrypted
signals through connections to an external EEPROM. The
circuit is ideal for providing an interface for HDTV monitors
or as the front end to high performance video scan converters.
Implemented in a high performance CMOS process, the
interface can capture signals with pixel rates of up to 80 MHz.
The AD9393 includes all necessary circuitry for decoding
TMDS signaling including those encrypted with HDCP.
Included in the output formatting is a color space converter
(CSC), which accommodates any input color space and can
output any color space. All controls are programmable via a
2-wire serial interface. Full integration of these sensitive mixed
signal functions makes system design straight forward and less
sensitive to the physical and electrical environment.
DIGITAL INPUTS
The digital control inputs (I2C) on the AD9393 operate to 3.3 V
CMOS levels. In addition, all digital inputs except the TMDS
inputs (HDMI/DVI) are 5 V tolerant. Applying 5 V to them
does not cause any damage. The TMDS input pairs (Rx0±,
Rx1±, Rx2±, and RxC±) must maintain a 100 Ω differential
impedance (through proper PCB layout) from the connector to
the input where they are internally terminated (50 Ω to 3.3 V).
If additional ESD protection is desired, using a low capacitance
ESD protection varistor offers 8 kV of protection to the HDMI
TMDS lines.
SERIAL CONTROL PORT
The serial control port is designed for 3.3 V logic. However, it is
tolerant of 5 V logic signals.
OUTPUT SIGNAL HANDLING
The digital outputs operate from 1.8 V to 3.3 V (VDD).
POWER MANAGEMENT
To determine the correct power state, the AD9393 uses the
activity detect circuits, the active interface bits in the serial bus,
the active interface override bits, the power-down bit, and the
power-down ball. There are three power modes: full power,
auto power-down, and power-down.
Table 5 summarizes how the AD9393 determines which power
mode to use and which circuitry is powered on/off in each of
these modes. The power-down command has first priority and
the automatic circuitry second priority. The power-down ball
(Ball B8—polarity set by Register 0x26[3]) can drive the chip
into two power-down options. Bit 2 of Register 0x26 controls
these two options. Bit 0 controls whether the chip is powered
down or the outputs are placed in high impedance mode. Bit 7
to Bit 4 of Register 0x26 control whether the outputs, Sony/
Philips digital interface (S/PDIF), or Inter-IC Sound bus (I2S or
IIS) outputs are in high impedance mode or not. See the 2-Wire
Serial Control Register Detail section for the details.
Table 5. Power-Down Mode Descriptions
Mode
Inputs
Power-On/Comments
Power-Down1
Auto PD Enable2
Full Power
1
X
Everything
Auto Power-Down
1
Serial bus, sync activity detect, band gap reference
Power-Down
0
X
Serial bus, sync activity detect, band gap reference
1 Power-down is controlled via Bit 0 in Register 0x26.
2 Auto power-down is controlled via Bit 7 in Register 0x27.
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