AD8396ACPZ-RL Analog Devices Inc, AD8396ACPZ-RL Datasheet - Page 8

• Manufacturer Part Number: AD8396ACPZ-RL
• Description: ADSL+2 DSL Line Driver For CO
• Manufacturer: Analog Devices Inc
• Type: Line Driver, Transmitterr

Specifications of AD8396ACPZ-RL

• Number Of Drivers/receivers: 2/0
• Voltage - Supply: 6 V ~ 24 V
• Mounting Type: Surface Mount
• Package / Case: 16-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Protocol: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD8396
THEORY OF OPERATION
The AD8396 is a current feedback amplifier with high output
current capability. With a current feedback amplifier, the
current into the inverting input is the feedback signal, and the
open-loop behavior is that of a transimpedance, dV
The open-loop transimpedance is analogous to the open-loop
voltage gain of a voltage feedback amplifier. Figure 13 shows a
simplified model of a current feedback amplifier. Because R
proportional to 1/g
where g
analysis of the follower with the gain circuit yields
where:
G = 1 + R
R
IN
= 1/ g
V
V
IN
O
m
m
is the transconductance of the input stage. Basic
F
=
/ R
≈ 50 Ω
G
G
×
T
Z
(S)
m
, the equivalent voltage gain is T
+
(
T
G
Z
×
(S)
R
IN
)
+
R
F
O
Z
/dI
× g
IN
m
or T
,
IN
Rev. C | Page 8 of 12
is
Z
.
Because G × R
has relatively constant bandwidth vs. gain. The 3 dB point is set
when |T
In a nonideal amplifier, there are additional poles that contribute
excess phase, and there is a value for R
is unstable. Tolerance for peaking and desired flatness determines
the optimum R
Z
| = R
V
IN
F
IN
.
F
in each application.
<< R
R
R
Figure 13. Simplified Block Diagram
G
N
F
for low gains, a current feedback amplifier
R
I
IN
IN
R
T
F
Z
F
below which the amplifier
V
OUT