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參數(shù)資料
型號(hào)： LT1228IS8#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 7/22頁(yè)
文件大?。?/td> 0K
描述： IC CRNT FEEDBK AMP 100MHZ 8SOIC
標(biāo)準(zhǔn)包裝： 100
放大器類型： 電流反饋
電路數(shù)： 1
轉(zhuǎn)換速率： 3500 V/µs
-3db帶寬： 100MHz
電流 - 輸入偏壓： 10µA
電壓 - 輸入偏移： 3000µV
電流 - 電源： 6mA
電流 - 輸出 / 通道： 125mA
電壓 - 電源，單路/雙路(±)： 4 V ~ 36 V，±2 V ~ 18 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SO
包裝： 管件
LT1228
15
1228fd
TYPICAL APPLICATIONS
Video Fader
Video DC Restore (Clamp) Circuit
LT1228 TA12
–
+
–
+
1k
100
gm
LT1223
CFA
VOUT
3
2
5
1
VIN1
1k
–
+
gm
3
1k
VIN2
10k
5.1k
10k
5.1k
10k
100
2
1k
5
1
–5V
VS = ±5V
The video fader uses the transconductance amplifiers
from two LT1228s in the feedback loop of another cur-
rent 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.
LT1228 TA13
–
+
–
+
gm
CFA
VOUT
8
3
2
5
V–
3k
RF
RG
4
10k
3k
5V
LOGIC
INPUT
RESTORE
0.01F
VIDEO
INPUT
2N3906
1
6
V+
7
200
1000pF
NOT NECESSARY IF THE SOURCE RESISTANCE IS LESS THAN 50Ω
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 ISET is zero. With ISET
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 RF and RG. When
the logic signal is low, the PNP turns on and ISET goes to
about 1mA. Then the transconductance amplifier charges
the capacitor 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 RG to the
video input instead of to ground.
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