參數(shù)資料
型號(hào): LT1810CMS8
元件分類: 運(yùn)算放大器
英文描述: Voltage-Feedback Operational Amplifier
中文描述: 電壓反饋運(yùn)算放大器
文件頁數(shù): 18/24頁
文件大?。?/td> 314K
代理商: LT1810CMS8
LT1806/LT1807
18
TYPICAL APPLICATIO S
Single Supply Video Line Driver
The LT1806/LT1807 are wideband rail-to-rail op amps
with large output current that allows them to drive video
signals in low supply applications. Figure 4 depicts a
single supply video line driver with AC coupling to mini-
mize the quiescent power dissipation. Resistors R1 and
R2 are used to level-shift the input and output to provide
the largest signal swing. The gain of 2 is set up with R3 and
R4 to restore the signal at V
OUT
, which is attenuated by 6dB
due to the matching of the 75
line with the back-terminated
resistor, R5. The back termination will eliminate any
reflection of the signal that comes from the load. The input
termination resistor, R
T
, is optional—it is used only if
matching of the incoming line is necessary. The values of
C1, C2 and C3 are selected to minimize the droop of the
luminance signal. In some less stringent requirements,
the value of capacitors could be reduced. The –3dB
bandwidth of the driver is about 90MHz on 5V supply, and
the amount of peaking will vary upon the value of capacitor
C4.
+
LT1806
V
IN
18067 F04
C1
33
μ
F
C2
150
μ
F
R
T
75
R
LOAD
75
V
OUT
R2
5k
R3
1k
R4
1k
C4
3pF
R1
5k
5V
2
3
6
7
4
R5
75
75
COAX CABLE
C3
1000
μ
F
+
+
+
Figure 4. 5V Single Supply Video Line Driver
FREQUENCY (MHz)
–2
V
4
5
–3
–4
3
0
2
1
–1
0.2
10
100
18067 F05
–5
1
V
S
= 5V, 0V
Figure 5. Video Line Driver Frequency Response
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