參數(shù)資料
型號: MAX9218EVKIT+
廠商: Maxim Integrated Products
文件頁數(shù): 5/15頁
文件大小: 0K
描述: KIT PCB EVALUATION FOR MAX9218
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 1
系列: *
MAX9218
27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Deserializer
______________________________________________________________________________________
13
Staggered and Transition Time Adjusted
Outputs
RGB_OUT[17:0] are grouped into three groups of six,
with each group switching about 1ns apart in the video
phase
to
reduce
EMI
and
ground
bounce.
CNTL_OUT[8:0] switch during the control phase. Output
transition times are slower in the 3MHz-to-7MHz and
7MHz-to-15MHz ranges and faster in the 15MHz-to-
35MHz range.
Data Enable Output (DE_OUT)
The MAX9218 deserializes video and control data at dif-
ferent times. Control data is deserialized during the video
blanking time. DE_OUT high indicates that video data is
being deserialized and output on RGB_OUT[17:0].
DE_OUT low indicates that control data is being deserial-
ized and output on CNTL_OUT[8:0]. When outputs are
not being updated, the last data received is latched on
the outputs. Figure 13 shows the DE_OUT timing.
Power-Supply Circuits and Bypassing
There are separate on-chip power domains for digital
circuits and LVTTL/LVCMOS inputs (VCC supply and
GND), outputs (VCCO supply and VCCO GND), PLL
(VCCPLL supply and VCCPLL GND), and the LVDS input
(VCCLVDS supply and VCCLVDS GND). The grounds are
isolated by diode connections. Bypass each VCC,
VCCO, VCCPLL, and VCCLVDS pin with high-frequency,
surface-mount ceramic 0.1F and 0.001F capacitors
in parallel as close to the device as possible, with the
smallest value capacitor closest to the supply pin. The
outputs are powered from VCCO, which accepts a
1.71V to 3.6V supply, allowing direct interface to inputs
with 1.8V to 3.3V logic levels.
Cables and Connectors
Interconnect for LVDS typically has a differential
impedance of 100
Ω. Use cables and connectors that
have matched differential impedance to minimize
impedance discontinuities.
Twisted-pair and shielded twisted-pair cables offer
superior signal quality compared to ribbon cable and
tend to generate less EMI due to magnetic field cancel-
ing effects. Balanced cables pick up noise as common
mode, which is rejected by the LVDS receiver.
Board Layout
Separate the LVTTL/LVCMOS outputs and LVDS inputs
to prevent crosstalk. A four-layer PCB with separate lay-
ers for power, ground, and signals is recommended.
PCLK_OUT
CNTL_OUT
DE_OUT
RGB_OUT
= OUTPUT DATA HELD
PCLK_OUT TIMING SHOWN FOR R/F = HIGH (RISING OUTPUT LATCH EDGE)
CONTROL DATA
VIDEO DATA
Figure 13. Output Timing
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