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參數(shù)資料
| 型號： | LT1204CSW#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VIDEOMUX CFA 75MHZ 4IN 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 47 |
| 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： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1356 (CN2011-ZH PDF) |
15
LT1204
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
Multiplexer Expansion Pin 11 and Pin 12
To expand the number of MUX inputs, LT1204s can be
paralleled by shorting their outputs together. The multi-
plexer disable logic has been designed to prevent shoot-
through current when two or more amplifiers have their
outputs shorted together. (Shoot-through current is a
spike of power supply current caused by both amplifiers
being on at once.)
Monitoring Supply Current Spikes
The multiplexer uses a circuit to ensure the disabled
amplifiers do not load or alter the cable termination. When
the LT1204 is disabled (Pin 11 low) the output stage is
turned off and an active buffer senses the output and
drives the feedback pin to the CFA (Figure 2). This boot-
straps the feedback resistors and raises the true output
impedance of the circuit. For the condition where RF = RG
= 1k, the Disable Output Resistance is typically raised to
25k and drops to 20k for AV = 10, RF = 2k and RG = 222
due to loading of the feedback buffer. Operating the
Disable feature with RG < 100 is not recommended.
A shutdown feature (Pin 12 low) reduces the supply
current to 1.5mA and lowers the power dissipation
when the LT1204 is not in use. If the part is shut down,
the bootstrapping is inoperative and the feedback resis-
tors will load the output. If the CFA is operated at a gain
of +1, however, the feedback resistor will not load the
output even in shutdown because there is no resistive
path to ground, but there will be a – 6dB loss through
the cable system.
A frequency response plot shows the effect of using the
disable feature versus using the shutdown feature. In
this example four LT1204s were connected together at
their outputs forming a 16-to-1 MUX. The plot shows the
effect of the bootstrapping circuit that eliminates the
–
+
LT1204
1
3
5
7
13
14
11
EN
V–
16
V+
TO SCOPE
15
75
–
+
LT1204
1
3
5
7
13
14
11
EN
V–
16
15
1k
75
V+
74HC04
75
TEK
CT-1
O
5V
OSCILLATOR
1204 AI13
1k
Timing and Supply Current Waveforms
OSCILLATOR
5V/DIV
VOUT
1V/DIV
IS
10mA/DIV
74HC04
OUTPUT
5V/DIV
1204 AI14
TEE SWITCH
VIN0
TEE SWITCH
VIN1
TEE SWITCH
VIN2
TEE SWITCH
VIN3
V–
LT1204
“ON”
–
+
CFA
“OFF”
FB
RF
RG
VOUT
75
75
CABLE
1204 F02
AV = +1
75
Figure 2. Active Buffer Drives FB Pin 13
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| LT1205 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:150MHz Video Multiplexers |
| LT1205CS | 制造商:Linear Technology 功能描述:Analog Multiplexer/Amp Dual 2:1 16-Pin SOIC N |
| LT1205CS#PBF | 功能描述:IC VIDEO MULTIPLEXER SPDT 16SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 功能:多路復(fù)用器 電路:1 x 4:1 導(dǎo)通狀態(tài)電阻:- 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±5V 電流 - 電源:7mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| LT1205CS#TR | 功能描述:IC VIDEO MULTIPLEXER SPDT 16SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 功能:多路復(fù)用器 電路:1 x 4:1 導(dǎo)通狀態(tài)電阻:- 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±5V 電流 - 電源:7mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| LT1205CS#TRPBF | 功能描述:IC VIDEO MULTIPLEXER SPDT 16SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 功能:多路復(fù)用器 電路:1 x 4:1 導(dǎo)通狀態(tài)電阻:- 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±5V 電流 - 電源:7mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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