LT1810 데이터 시트보기 (PDF) - Linear Technology
부품명
상세내역
제조사
LT1810
Linear Technology
LT1810 Datasheet PDF : 24 Pages
| |||
LT1809/LT1810
TYPICAL APPLICATIONS
VIN
1VP-P
ON 2.5V DC
5V
3+
7
LT1809
6 49.9Ω
2–
1
4
470pF
1k
1k
0.15μF
5V
1
LTC1420
+AIN PGA GAIN = 2
2 –AIN REF = 4.096V
•
•
•
VCM
3
1809 F06
12 BITS
10Msps
1μF
Figure 6. Single Supply A/D Driver
0
VS = 5V
AV = +2
–20
fSAMPLE = 10Msps
fIN = 1.394MHz
SFDR = 80dB
–40
–60
–80
–100
–120
0
1
2
3
4
5
FREQUENCY (MHz)
1809 F07
Figure 7. 4096 Point FFT Response
5V
C1
R1
VIN
33μF
RT
5k
3+ 7
R2
LT1809
C3
1000μF R5
6
75Ω
75Ω
COAX CABLE
75Ω
5k 2 –
4 R4
1k
R3
C4
1k
3pF
+ C2
150μF
VOUT
RLOAD
75Ω
1809 F08
Figure 8. 5V Single Supply Video Line Driver
5
VS = 5V
4
3
2
1
0
–1
–2
–3
–4
–5
0.2
1
10
FREQUENCY (MHz)
100
1809 F09
Figure 9. Video Line Driver Frequency Response
Single Supply Video Line Driver
The LT1809 is a wideband rail-to-rail op amp with a large
output current that allows it to drive video signals in low
supply applications. Figure 8 depicts a single supply
video line driver with AC coupling to minimize the qui-
escent power dissipation. Resistors R1 and R2 are used
to level-shift the input and output to provide the largest
signal swing. A gain of 2 is set up with R3 and R4 to re-
store the signal at VOUT, which is attenuated by 6dB due
to the matching of the 75Ω line with the back-terminated
resistor, R5. The back termination will eliminate any re-
flection of the signal that comes from the load. The input
termination resistor, RT, 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 95MHz on 5V supply and the amount
of peaking will vary upon the value of capacitor C4.
20
180910fa
Share Link: 