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AD8079BR Folha de dados(PDF) 8 Page - Analog Devices

Nome de Peças AD8079BR
Descrição Electrónicos  Dual 260 MHz Gain = 2.0 & 2.2 Buffer
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD8079BR Folha de dados(HTML) 8 Page - Analog Devices

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AD8079
REV. A
–8–
8
7
6
2
1
5
4
3
VOUT #1
75
75
CABLE
75
VOUT #2
75
75
CABLE
75
75
75
CABLE
VIN
+VS
–VS
VOUT #3
75
75
CABLE
75
VOUT #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-Ended to Differential Driver Using an AD8079
The 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, RF, which is often not possible in a dual
op amp differential driver.
50
OUTPUT #1
50
OUTPUT #2
RG
750
RF 750Ω
1/2
AD8079
1/2
AD8079
OP AMP #1
OP AMP #2
VIN
CC = 1.5pF
Figure 27. Differential Line Driver
VOUT
RF
( INTERNAL)
RN
I BI
I BN
RI
( INTERNAL)
RSERIES
CL
Figure 24. Output Offset Voltage
Driving Capacitive Loads
The 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 (RSERIES). The graph in Figure 25 shows the
optimum value for RSERIES 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
RSERIES and CL.
CL – pF
40
30
0
025
5
10
15
20
20
10
Figure 25. Recommended RSERIES vs. Capacitive Load
Operation as a Video Line Driver
The AD8079 has been designed to offer outstanding perfor-
mance as a video line driver. The important specifications of
differential gain (0.01%) and differential phase (0.02
°) meet the
most exacting HDTV demands for driving one video load with
each amplifier. The 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. The
AD8079 has more than 40 dB of isolation at 5 MHz when driv-
ing two 75
Ω back terminated loads.


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