參數(shù)資料
型號(hào)： LT1204CSW
廠商： LINEAR TECHNOLOGY CORP
元件分類： 運(yùn)動(dòng)控制電子
英文描述： 4-Input Video Multiplexer with 75MHz Current Feedback Amplifier
中文描述： VIDEO MULTIPLEXER, PDSO16
封裝： 0.300 INCH, PLASTIC, SO-16
文件頁(yè)數(shù)： 15/20頁(yè)
文件大?。?/td> 330K
代理商： LT1204CSW
15
LT1204
U
S
A
Multiplexer Expansion Pin 11 and Pin 12
O
PPLICATI
W
U
I FOR ATIO
U
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 R
F
= R
G
= 1k, the Disable Output Resistance is typically raised to
25k and drops to 20k for A
V
= 10, R
F
= 2k and R
G
= 222
due to loading of the feedback buffer. Operating the
Disable feature with R
G
< 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
EN
1
3
5
7
13
14
11
V
–
16
V
+
TO SCOPE
15
75
–
+
+
+
+
LT1204
1
3
5
7
13
14
11
EN
V
–
16
15
1k
1k
75
V
+
74HC04
75
TEK
CT-1
O
5V
OSCILLATOR
1204 AI13
1k
1k
Timing and Supply Current Waveforms
OSCILLATOR
5V/DIV
V
1V/DIV
I
S
10mA/DIV
74HC04
OUTPUT
5V/DIV
1204 AI14
TEE SWITCH
V
IN0
TEE SWITCH
V
IN1
TEE SWITCH
V
IN2
TEE SWITCH
V
IN3
V
–
LT1204
“ON”
–
+
CFA
“OFF”
FB
R
F
R
G
V
OUT
75
75
CABLE
1204 F02
A
V
= +1
75
Figure 2. Active Buffer Drives FB Pin 13
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1204CSW#PBF 功能描述:IC VIDEOMUX CFA 75MHZ 4IN 16SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 應(yīng)用:TFT-LCD 面板：VCOM 驅(qū)動(dòng)器 輸出類型:滿擺幅 電路數(shù):1 -3db帶寬:35MHz 轉(zhuǎn)換速率:40 V/µs 電流 - 電源:3.7mA 電流 - 輸出 / 通道:1.3A 電壓 - 電源，單路/雙路(±):9 V ~ 20 V，±4.5 V ~ 10 V 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬）裸露焊盤 供應(yīng)商設(shè)備封裝:8-uMax-EP 包裝:管件
LT1204CSW#PBF 制造商:Linear Technology 功能描述:IC SM OP AMP VIDEO
LT1204CSW#TR 功能描述:IC MUX VIDEO 75MHZ 4INPUT 16SOIC RoHS:否 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動(dòng)器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR)
LT1204CSW#TRPBF 功能描述:IC VIDEOMUX CFA 75MHZ 4IN 16SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動(dòng)器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR)
LT1205 制造商:LINER 制造商全稱:Linear Technology 功能描述:150MHz Video Multiplexers
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