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参数资料
| 型号： | FSM6403MTC |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封装： | LEAD FREE, MO-153AC, TSSOP-20 |
| 文件页数： | 4/14页 |
| 文件大小： | 670K |
| 代理商： | FSM6403MTC |
2005 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FMS6403 Rev. 1.0.4
12
FM
S6403
—
Triple
Video
D
rivers
wit
h
Select
able
H
D
/PS/SD
B
y
pass
Filt
ers
f
o
rR
G
B
and
YPbPr
Signals
Applications Information
Input Circuitry
The DC restore circuit requires a source impedance
(RSOURCE = RS || RT) of less than or equal to 150 for
correct operation. Driving the FMS6403 with a high-
impedance source (e.g. a DAC loaded with 330) does
not yield optimum results. Refer Figure 2 for details.
Output Drive
The FMS6403 is specified to operate with output
currents typically less than 60mA, more than sufficient
for a dual (75) video load. Internal amplifiers are
current limited to approximately 100mA and should
withstand
brief-duration,
short-circuit
conditions;
however, this capability is not guaranteed.
The maximum specified input voltage of 1.5VPP can be
sustained for all inputs. When the input is clamped to
1.125V, this does not result in a meaningful output
signal. With a gain of 6dB, the output should be 1.125V
±1.5V, which is not possible since the output cannot
drive below ground. This condition will not damage the
part; however, the output will be clipped. For signals
clamped to 250mV, this does not occur.
Signals at mid-scale during SYNC (Pb and Pr) must be
clamped to 1.125V. Signals that are at their lowest
during SYNC (Y, R, G, B) must be clamped to 250mV
for proper operation. Clamping a Pr signal to 250mV
results in clipping the bottom of the signal.
The
220F
capacitor
coupled
with
the
150
termination, as shown in the Figure 2, forms a high-
pass filter that blocks the DC while passing the video
frequencies and avoiding tilt. Any value lower than
220μF creates problems, such as video tilt. Higher
values, such as 470μF - 1000μF, are the most optimal
output coupling capacitor. By AC coupling, the average
DC level is zero and the output voltages of all channels
is centered ~zero.
Sync Recovery
The FMS6403 typically recovers bi-level sync with
amplitude greater than 100mV (33% compressed
relative to the nominal 300mV amplitude). The
FMS6403 looks for the lowest signal voltage and
clamps this to approximately 250mV at the output.
Tri-level sync may not be compressed more than 5%
(15mV) for correct operation. Tri-level sync is located by
finding the edges of the tri-level pulse and running a
timer to operate the clamp during the back porch
interval.
The selection of the 8MHz or 15MHz filters enables bi-
level sync recovery. Selection of the 30MHz filter or
bypass mode enables tri-level sync recovery. Bi-level
and tri-level sync recovery are not interchangeable. See
the Sync Processing section for more information.
Power Dissipation
The output drive configuration must be considered
when calculating overall power dissipation. Care must
be taken not to exceed the maximum die junction
temperature. The following example can be used to
calculate the FMS6403’s power dissipation and internal
temperature rise:
TJ = TA + Pd ΘJA
where:
PD = PCH1 + PCH2 + PCH3
and:
PCHx = VS ICH - (VO
2/RL)
where:
VO = 2VIN + 0.280V
ICH = (ICC / 3) + (VO/RL)
VIN = RMS value of input signal
ICC = 90mA
VS = 5V
RL = channel load resistance
(1)
Board layout can also affect thermal characteristics.
Refer to the Layout Considerations Section for more
information.
The FMS6403 is specified to operate with
output currents typically less than 60mA, more than
sufficient for a single (150) video load. Internal
amplifiers are current limited to a maximum of 100mA
and should withstand brief duration short circuit
conditions, however this capability is not guaranteed.
Layout Considerations
General layout and supply bypassing play major roles in
high-frequency
performance
and
thermal
characteristics. Fairchild offers an evaluation board,
FMS6403DEMO, to guide layout and aid device testing
and characterization. The FMS6403DEMO is a four-
layer board with a full power and ground planes. For
optimum results, follow the steps below as a basis for
high-frequency layout:
Include 10μF and 0.1μF ceramic bypass
capacitors.
Place the 10μF capacitor within 0.75 inches of the
power pin.
Place the 0.1μF capacitor within 0.1 inches of the
power pin.
Connect all external ground pins as tightly as
possible, preferably with a large ground plane
under the package.
Layout channel connections to reduce mutual trace
inductance.
Minimize all trace lengths to reduce series
inductances. If routing across a board, place devise
such that longer traces are at the inputs rather than
the outputs.
If using multiple, low-impedance DC-coupled outputs;
special layout techniques can help dissipate heat. For
dual-layer boards, place a 0.5-inch to 1-inch (1.27cm to
2.54cm) square ground plane directly under the device
and on the bottom side of the board. Use multiple vias
to connect the ground planes. For multi-layer boards,
additional planes (connected with vias) can be used for
additional thermal improvements.
Worst-case additional die power due to DC loading can
be estimated at (VCC
2/4Rload) per output channel. This
assumes a constant DC output voltage of VCC
2. For 5V
VCC with a dual DC video load, add 25/(475) = 83mW,
per channel.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSM6403MTC20X | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Triple Video Drivers with Selectable HD/PS/SD Bypass Filters for RGB and YPbPr Signals |
| FSM6J | 功能描述:SWITCH TACTILE SPST-NO 0.05A 12V RoHS:是 类别:开关 >> 触摸 系列:FSMJ 标准包装:2,000 系列:LPH 电路:SPST-NO 开关功能:关-瞬时 触点额定电压:0.05A @ 12VDC 触动器类型:标准 安装类型:通孔 从引脚算起，致动器距离 PCB 的高度:7.00mm 致动器方向:顶部触动 端接类型:PC 引脚 外形:6.00mm x 6.00mm 发光:不发光 发光电压:- 发光类型，颜色:- 操作力:160gf 防护等级:IP40 特点:触摸反馈 包装:带卷 (TR) 触动器材料:- 开关行程:0.25mm 机械寿命:100,000 次循环 工作温度:-20°C ~ 70°C 其它名称:1301.9303-ND486-1943-2 |
| FSM6JA | 功能描述:SWITCH TACTILE SPST-NO 0.05A 12V RoHS:是 类别:开关 >> 触摸 系列:FSMJ 标准包装:2,000 系列:LPH 电路:SPST-NO 开关功能:关-瞬时 触点额定电压:0.05A @ 12VDC 触动器类型:标准 安装类型:通孔 从引脚算起，致动器距离 PCB 的高度:7.00mm 致动器方向:顶部触动 端接类型:PC 引脚 外形:6.00mm x 6.00mm 发光:不发光 发光电压:- 发光类型，颜色:- 操作力:160gf 防护等级:IP40 特点:触摸反馈 包装:带卷 (TR) 触动器材料:- 开关行程:0.25mm 机械寿命:100,000 次循环 工作温度:-20°C ~ 70°C 其它名称:1301.9303-ND486-1943-2 |
| FSM6JAA | 制造商:MACOM 制造商全称:Tyco Electronics 功能描述:Tactile Switches, .138 [3.5] x .236 [6], Through Hole |
| FSM6JAAH | 功能描述:触觉开关 6MM HIGH TEMP TACT SWITCH RoHS:否 制造商:C&K Components 工作力:2 N 执行器:Round 电流额定值:50 mA 电压额定值 DC:32 V 电压额定值 AC: 功率额定值:1 VA 接地端子:Yes 触点形式:SPST-NO 开关功能: 安装风格:SMD/SMT 安装方向:Right 晶体管管座高度: 颜色: 照明:Not Illuminated 照明颜色: 封装: |
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