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參數(shù)資料
| 型號： | LM7121IN |
| 英文描述： | IC-200MHZ FEEDBACK AMP |
| 中文描述： | 集成電路200MHz的反饋放大器 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大小： | 394K |
| 代理商： | LM7121IN |
Application Information
The table below, depicts the maximum operating supply
voltage for each package type:
TABLE I. Maximum Supply Voltage Values
SOT23-5
SO-8
DIP
Single Supply
10V
30V
30V
Dual Supplies
g
5V
g
15V
g
15V
Stable unity gain operation is possible with supply voltage of
5V for all capacitive loads. This allows the possibility of us-
ing the device in portable applications with low supply volt-
ages with minimum components around it.
Above a supply voltage of 6V (
g
3V Dual supplies), an addi-
tional resistor and capacitor (shown below) should be
placed in the feedback path to achieve stability at unity gain
over the full temperature range.
TL/H/12348–87
FIGURE 1. Typical Circuit for A
V
e a
1
Operation (V
S
t
6V)
The package power dissipation should be taken into ac-
count when operating at high ambient temperatures and/or
high power dissipative conditions. Refer to the power derat-
ing curves in the data sheet for each type of package.
In determining maximum operable temperature of the de-
vice, make sure the total power dissipation of the device is
considered; this includes the power dissipated in the device
with a load connected to the output as well as the nominal
dissipation of the op amp.
The device is capable of tolerating momentary short circits
from its output to ground but prolonged operation in this
mode will damage the device, if the maximum allowed junc-
tion temperation is exceeded.
APPLICATION CIRCUITS
Current Boost Circuit
The circuit inFigure 2 can be used to achieve good linearity
along with high output current capability.
TL/H/12348–92
FIGURE 2. Simple Circuit to Improve Linearity
and Output Drive Current
By proper choice of R
3
, the LM7121 output can be set to
supply a minimal amount of current, thereby improving its
output linearity.
R
3
can be adjusted to allow for different loads:
R
3
e
0.1 R
L
The circuit above has been set for a load of 100
X
.
Reasonable speeds (
k
30 ns rise and fall times) can be ex-
pected up to 120 mA
PP
of load current (see Figure 3 for
step response across the load).
TL/H/12348–93
FIGURE 3. Waveform across a 100
X
Load
It is very important to keep the lead lengths to a minimum
and to provide a low impedance current path by using a
ground-plane on the board.
Caution:
If R
L
is removed, the current balance at the output
of LM7121 would be disturbed and it would have to supply
the full amount of load current. This might damage the part
if power dissipation limit is exceeded.
http://www.national.com
13
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