參數(shù)資料
型號: LT1204CN
廠商: Linear Technology
文件頁數(shù): 8/20頁
文件大?。?/td> 0K
描述: IC VIDEO MUX CFA 75MHZ 4IN 16DIP
標(biāo)準(zhǔn)包裝: 25
應(yīng)用: 4:1 多路復(fù)用器-放大器
電路數(shù): 1
-3db帶寬: 75MHz
轉(zhuǎn)換速率: 1000 V/µs
電流 - 電源: 19mA
電流 - 輸出 / 通道: 125mA
電壓 - 電源,單路/雙路(±): 10 V ~ 30 V,±5 V ~ 15 V
安裝類型: 通孔
封裝/外殼: 16-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 16-PDIP
包裝: 管件
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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