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參數(shù)資料
| 型號(hào)： | AD8079 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual Low Power,High Speed, Gain = +2.0 & +2.2 Buffer(低功耗，高速，增益為2.0到2.2的雙緩沖器放大器) |
| 中文描述： | 雙低功耗，高速，增益\u003d 2.0 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 176K |
| 代理商： | AD8079 |
AD8079
REV. A
–8–
8
7
6
2
1
5
4
3
V
OUT
#1
75
75
CABLE
75
V
OUT
#2
75
75
CABLE
75
75
75
CABLE
V
IN
+V
S
–V
S
V
OUT
#3
75
75
CABLE
75
V
OUT
#4
75
75
CABLE
75
1/2
AD8079
1/2
AD8079
4.7μF
4.7μF
0.1μF
0.1μF
Figure 26. Video Line Driver
Single-E nded to Differential Driver Using an AD8079
T he two halves of an AD8079 can be configured to create a
single-ended to differential high speed driver with a –3 dB band-
width in excess of 110 MHz as shown in Figure 27. Although
the individual op amps are each current feedback with internal
feedback resistors, the overall architecture yields a circuit with
attributes normally associated with voltage feedback amplifiers,
while offering the speed advantages inherent in current feedback
amplifiers. In addition, the gain of the circuit can be changed by
varying a single resistor, R
F
, which is often not possible in a dual
op amp differential driver.
C
C
= 1.5pF
50
OUTPUT #1
50
OUTPUT #2
R
G
750
R
F
750
1/2
AD8079
1/2
AD8079
OP AMP #1
OP AMP #2
V
IN
Figure 27. Differential Line Driver
V
OUT
R
F
(INTERNAL)
R
N
I
BI
I
BN
R
(INTERNAL)
R
SERIES
C
L
Figure 24. Output Offset Voltage
Driving Capacitive Loads
T he AD8079 was designed primarily to drive nonreactive loads.
If driving loads with a capacitive component is desired, best
frequency response is obtained by the addition of a small series
output resistance (R
SERIES
). T he graph in Figure 25 shows the
optimum value for R
SERIES
vs. capacitive load. It is worth noting
that the frequency response of the circuit when driving large
capacitive loads will be dominated by the passive roll-off of
R
SERIES
and C
L
.
40
C
L
– pF
30
00
25
5
R
S
10
15
20
20
10
Figure 25. Recommended R
SERIES
vs. Capacitive Load
Operation as a Video Line Driver
T he AD8079 has been designed to offer outstanding perfor-
mance as a video line driver. T he important specifications of
differential gain (0.01%) and differential phase (0.02
°
) meet the
most exacting HDT V demands for driving one video load with
each amplifier. T he AD8079 also drives four back terminated
loads (two each), as shown in Figure 26, with equally impressive
performance (0.01%, 0.07
°
). Another important consideration is
isolation between loads in a multiple load application. T he
AD8079 has more than 40 dB of isolation at 5 MHz when driv-
ing two 75
back terminated loads.
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| AD8079AR-REEL | 制造商:Analog Devices 功能描述:OP Amp Dual Current Fdbk 制造商:Analog Devices 功能描述:OP Amp Dual Current Fdbk ±6V 8-Pin SOIC N T/R |
| AD8079AR-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Dual Current Fdbk 制造商:Analog Devices 功能描述:OP Amp Dual Current Fdbk ±6V 8-Pin SOIC N T/R |
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