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參數(shù)資料
| 型號： | LT1228 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 100MHz Current Feedback Amplifier with DC Gain Control(100MHz ，電流反饋放大器（帶直流增益控制）) |
| 中文描述： | 100MHz的電流反饋放大器的直流增益控制（100MHz時，電流反饋放大器（帶直流增益控制）） |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 357K |
| 代理商： | LT1228 |
15
LT1228
Video DC Restore (Clamp) Circuit
LT1228 TA13
–
+
–
+
g
m
CFA
V
OUT
8
3
2
5
V
–
3k
R
F
R
G
4
10k
3k
5V
LOGIC
INPUT
RESTORE
0.01
μ
F
VIDEO
INPUT
2N3906
1
6
V
+
7
200
1000pF
NOT NECESSARY IF THE SOURCE RESISTANCE IS LESS THAN 50
The video restore (clamp) circuit restores the black level of
the composite video to zero volts at the beginning of every
line. This is necessary because AC coupled video changes
DC level as a function of the average brightness of the
picture. DC restoration also rejects low frequency noise
such as hum.
The circuit has two inputs: composite video and a logic
signal. The logic signal is high except during the back
porch time right after the horizontal sync pulse. While the
logic is high, the PNP is off and I
SET
is zero. With I
SET
equal
to zero the feedback to pin 2 has no affect. The video input
drives the noninverting input of the current feedback
amplifier whose gain is set by R
F
and R
G
. When the logic
signal is low, the PNP turns on and I
SET
goes to about 1mA.
Then the transconductance amplifier charges the capaci-
tor to force the output to match the voltage at pin 3, in this
case zero volts.
This circuit can be modified so that the video is DC coupled
by operating the amplifier in an inverting configuration.
Just ground the video input shown and connect R
G
to the
video input instead of to ground.
U
S
A
O
PPLICATI
TYPICAL
Video Fader
LT1228 TA12
–
+
–
+
1k
100
g
m
LT1223
CFA
V
OUT
3
2
5
1
V
IN1
1k
–
+
g
m
3
1k
V
IN2
10k
5.1k
10k
5.1k
10k
100
2
1k
5
1
–5V
V
S
= ±5V
The video fader uses the transconductance amplifiers
from two LT1228s in the feedback loop of another current
feedback amplifier, the LT1223. The amount of signal
from each input at the output is set by the ratio of the
set currents of the two LT1228s, not by their absolute
value. The bandwidth of the current feedback amplifier
is inversely proportional to the set current in this
configuration. Therefore, the set currents remain high
over most of the pot’s range, keeping the bandwidth over
15MHz even when the signal is attenuated 20dB. The pot
is set up to completely turn off one LT1228 at each end of
the rotation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1228_07 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228_12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback |
| LT1228C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
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| LT1228CN8 | 功能描述:IC CURRNT FEEDBCK AMP100MHZ 8DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
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