參數(shù)資料
型號(hào)： MAX3845UCQ+D
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 3/19頁(yè)
文件大?。?/td> 0K
描述： IC SW/CBL DRVR DVI/HDMI 100TQFP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 90
類型： HDMI/DVI 開關(guān)
應(yīng)用： HDMI，DVI，接收器
安裝類型： 表面貼裝
封裝/外殼： 100-TQFP 裸露焊盤
供應(yīng)商設(shè)備封裝： 100-TQFP-EP（14x14）
包裝： 管件
產(chǎn)品目錄頁(yè)面： 1423 (CN2011-ZH PDF)
MAX3845
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
______________________________________________________________________________________
11
Temperature Sense
Pin 14, TEMP, allows the on-die temperature to be
sensed as an analog voltage output. To sense the die
temperature, measure the DC voltage at TEMP. The
approximate die temperature can be determined using
the following equation:
TJ = (VTEMP - 0.93) x 297
Also see the
Typical Operating Characteristics section
for more information.
Power-Down
The power-down inputs (PWRDWN_1 and PWRDWN_2)
reduce power consumption by powering down the cho-
sen input and all outputs that are selected to that input.
For example, when output channels 1 and 4 are select-
ed to transmit input channel 2, and channel 2 is pow-
ered down, both outputs 1 and 4 are also powered
down.
Hotplug Detect
Each output channel has a HOTPLUGx detection pin
associated with it. This pin is designed to detect
whether a monitor’s hotplug connection is attached. If
HOTPLUGx is low (less than 1.5V), the associated out-
put is powered down. If HOTPLUGx is higher than
VCC - 0.2V, up to 5.5V, the associated output is pow-
ered up.
Activating an Output
Several things must occur for an output to be active.
Table 2 lists the required inputs to enable an output.
Cable Selection
Good quality cable is recommended for good perfor-
mance. Deterministic jitter (DJ) can be caused by dif-
ferential-to-common-mode conversion (or vice versa)
within a twisted pair (STP or UTP), usually a result of
cable twist or dielectric imbalance. Refer to Application
Note
HFAN-4.5.4: ‘Jitter Happens’ when a Twisted Pair
is Unbalanced for more information.
VOLTAGES AT THE INPUT OF THE TMDS RECEIVER (TYPICAL)
CONDITIONS
VDIFF
VCM
VH
VL
PREEMPHx = LOW, OUT_LEVEL = LOW (Output Drive Current = 11mA)
No back termination
1100mVP-P
VCC - 275mV
VCC
VCC - 550mV
PREEMPHx = LOW, OUT_LEVEL = HIGH (Output Drive Current = 14mA)
Differential 200
back terminations (DC-coupled)
950mVP-P
VCC - 350mV
VCC - 120mV
VCC - 585mV
Differential 300
back terminations (DC-coupled)
1050mVP-P
VCC - 350mV
VCC - 90mV
VCC - 615mV
Single-ended, 2x 100
back terminations (AC-coupled)
950mVP-P
VCC
VCC + 240mV
VCC - 240mV
Table 1. Output Levels With and Without Back Termination
OUTPUT x
STATE
IN_SELx
CONDITION
HOTPLUGx
CONDITION
PWRDWN_1
CONDITION
PWRDWN_2
CONDITION
LOS 1
CONDITION
LOS 2
CONDITION
INPUT 1
HIGH
LOW
Don’t care
LOW
Don’t care
INPUT 2
LOW
HIGH
Don’t care
LOW
Don’t care
LOW
Table 2. Output Enable Requirements
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