AD8079ARZ Analog Devices Inc, AD8079ARZ Datasheet - Page 8

• Manufacturer Part Number: AD8079ARZ
• Description: IC AMP BUF DUAL LP LDIST 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD8079ARZ

• Amplifier Type: Buffer
• Number Of Circuits: 2
• Slew Rate: 800 V/µs
• -3db Bandwidth: 260MHz
• Current - Input Bias: 3µA
• Voltage - Input Offset: 10000µV
• Current - Supply: 10mA
• Current - Output / Channel: 70mA
• Voltage - Supply, Single/dual (±): 6 V ~ 12 V, ±3 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Amplifiers: 2
• Gain Bandwidth: 260MHz
• Supply Voltage Range: ± 3V To ± 6V
• Output Current: 70mA
• Amplifier Output: Single Ended
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Gain Bandwidth Product: -

AD8079
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 (R
optimum value for R
that the frequency response of the circuit when driving large
capacitive loads will be dominated by the passive roll-off of
R
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
SERIES
Figure 25. Recommended R
and C
(INTERNAL)
40
30
20
10
0
0
R
R
back terminated loads.
L
Figure 24. Output Offset Voltage
I
N
.
SERIES
SERIES
5
I
I
BI
BN
). The graph in Figure 25 shows the
(INTERNAL)
vs. capacitive load. It is worth noting
R
10
F
C
L
SERIES
– pF
15
R
vs. Capacitive Load
SERIES
20
C
L
V
OUT
25
–8–
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, R
op amp differential driver.
V
IN
V
IN
CABLE
75
75
750
R
Figure 27. Differential Line Driver
G
AD8079
AD8079
Figure 26. Video Line Driver
1/2
1/2
1
4
2
3
AD8079
AD8079
C
R
1/2
1/2
+V
C
–V
F
6
7
F
= 1.5pF
750
S
S
, which is often not possible in a dual
OP AMP #1
OP AMP #2
4.7µF
0.1µF
0.1µF
4.7µF
8
5
75
75
75
75
50
50
CABLE
CABLE
CABLE
CABLE
75
75
75
75
OUTPUT #1
OUTPUT #2
75
75
75
75
REV. A
V
V
V
V
OUT
OUT
OUT
OUT
#1
#2
#3
#4