参数资料
型号: LT1204CSW#TRPBF
厂商: Linear Technology
文件页数: 8/20页
文件大小: 0K
描述: IC VIDEOMUX CFA 75MHZ 4IN 16SOIC
标准包装: 1,000
应用: 4:1 多路复用器-放大器
电路数: 1
-3db带宽: 75MHz
转换速率: 1000 V/µs
电流 - 电源: 19mA
电流 - 输出 / 通道: 125mA
电压 - 电源,单路/双路(±): 10 V ~ 30 V,±5 V ~ 15 V
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.295",7.50mm 宽)
供应商设备封装: 16-SOIC
包装: 带卷 (TR)
16
LT1204
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
improper cable termination due to feedback resistors
loading the cable.
The limit to the number of expanded inputs is set by the
acceptable error budget of the system.
16-to-1 MUX Response Using Disable vs Shutdown
For a 64-to-1 MUX we need sixteen LT1204s. The
equivalent load resistance due to the feedback resistor
REQ in Disable is 25k/15 = 1.67k. See Figure 3.
VO =
75REQ
75(75) + 150REQ
, VO = 0.489V
This voltage represents a 2.1% loading error. If the
shutdown feature is used instead of the disable feature,
then the LT1204 could expand to only an 8-to-1 MUX for
the same error.
As a practical matter the gain error at frequency is also
set by capacitive loading. The disabled output capaci-
tance of the LT1204 is about 8pF, and in the case of
sixteen LT1204s, it would represent a 128pF load. The
combination of 1.67k and 128pF correspond to about a
0.3dB roll-off at 5MHz.
Figure 3. Equivalent Loading Schematic
16-to-1 Multiplexer All Hostile Crosstalk
FREQUENCY (MHz)
1
–6
GAIN
(dB)
–4
–2
0
2
10
100
1204 AI15
4
VS = ±15V
RL = 100
RF = RG = 1k
DISABLE
SHUTDOWN
FREQUENCY (MHz)
1
–120
ALL
HOSTILE
CROSSTALK
(dB)
–100
–80
–60
–40
10
100
1204 AI16
–20
VS = ±15V
RL = 100
RF = RG = 1k
RS = 0
SHUTDOWN
CROSSTALK
DISABLE
CROSSTALK
ON
75
1V
LT1204
OFF
75
LT1204
75
VOUT
CABLE
75
VOUT
REQ
75
1V
1204 F03
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