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参数资料
| 型号： | FMS6501MSA28 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 3/14页 |
| 文件大小： | 0K |
| 描述： | IC VIDEO SW MATRIX 12X9 28SSOP |
| 标准包装： | 47 |
| 类型： | 视频开关，12 输入，9 输出 |
| 应用： | 机顶盒 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
FMS6501
—
12
Input
/
9
Output
V
ideo
Switch
Matrix
with
I
nput
Clamp,
Input
Bias
Circ
uitry
,and
Output
Drivers
2004 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FMS6501 Rev. 1.0.4
11
Thermal issues are significantly reduced with AC-cou-
pled outputs, alleviating special PC layout requirements.
Each of the outputs can be independently powered down
and placed in a high-impedance state with the ENABLE
bit. This function can be used to mute video signals, to
parallel multiple FMS6501 outputs, or to save power.
When the output amplifier is disabled, the high-imped-
ance output presents a 3k
Ω load to ground. The output
amplifier typically enters and recovers from the power-
down state in less than 300ns after being programmed.
When an output channel is not connected to an input, the
input to that channel’s amplifier is forced to approxi-
mately 150mV. The output amplifier is still active unless
specifically disabled by the I2C interface. Voltage output
levels depend on the programmed gain for that channel.
Crosstalk
Crosstalk is an important consideration when using the
FMS6501. Input and output crosstalk are defined to rep-
resent the two major coupling modes in a typical applica-
tion. Input crosstalk is crosstalk in the input pins and
switches when the interfering signal drives an open
switch. It is dominated by inductive coupling in the pack-
age lead frame between adjacent leads. It decreases
rapidly as the interfering signal moves farther away from
the pin adjacent to the input signal selected. Output
crosstalk is coupling from one driven output to another
active output. It decreases with increasing load imped-
ance, as it is caused mainly by ground and power cou-
pling between output amplifiers. If a signal is driving an
open switch, its crosstalk is mainly input crosstalk. If it is
driving a load through an active output, its crosstalk is
mainly output crosstalk.
Input and output crosstalk measurements are performed
with the test configuration shown in Figure 12.
Figure 12. Test Configuration for Crosstalk
For input crosstalk, the switch is open. All inputs are in
bias mode. Channel 1 input is driven with a 1Vpp signal,
while all other inputs are AC terminated with 75
Ω. All out-
puts are enabled and crosstalk is measured from IN1 to
any output.
For output crosstalk, the switch is closed. Crosstalk from
OUT1 to any output is measured.
Crosstalk from multiple sources into a given channel was
measured with the setup shown in Figure 6. Input IN1 is
driven with a 1Vpp pulse source and is connected to out-
puts Out1 to Out8. Input In9 is driven with a secondary,
asynchronous, gray-field video signal, and is connected
to Out9. All other inputs are AC terminated with 75
Ω.
Crosstalk effects on the gray field are measured and cal-
culated with respect to a standard 1Vpp output measured
at the load.
If not all inputs and outputs are needed, avoid using
adjacent channels, where possible, to reduce crosstalk.
Disable all unused channels to further reduce crosstalk
and power dissipation.
Figure 13. Test Configuration for Multi-Channel
Crosstalk
Bias
IN1
OUT1
Bias
IN12
OUT9
Gain = 6dB
OUT1 = 2.0Vpp
Input crosstalk from IN1
to OUTx
Output crosstalk from
OUT1 to OUTx
TERMINATION
IN2 - IN12 are
AC-Term to
ground with
IN1 = 1Vpp
Open switch
for input
crosstalk
Close switch
for output
crosstalk
75
Bias
IN1
OUT1
Bias
IN12
OUT9
Gain = 6dB
OUT1 = 2.0Vpp
Measure crosstalk from
Channels 1-8 into Channel 9
TERMINATION
Bias
IN9
IN1 driven with
SD videio 1Vpp
IN9 driven with
asynchronous
SD video 1Vpp
IN2-8 + IN10-12
driven with
AC term to GND
with 75
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