參數(shù)資料
型號(hào)： LM359
廠商： National Semiconductor Corporation
英文描述： Dual, High Speed, Programmable, Current Mode Norton Amplifiers
中文描述： 雙路，高速，可編程，電流模式諾頓放大器
文件頁(yè)數(shù)： 8/24頁(yè)
文件大?。?/td> 742K
代理商： LM359
Application Hints
(Continued)
The following figures illustrate typical biasing schemes for
AC amplifiers using the LM359:
The nV
biasing configuration is most useful for low noise
applications where a reduced input impedance can be ac-
commodated (see typical applications section).
OPERATING CURRENT PROGRAMMABILITY (I
SET
)
The input bias current, slew rate, gain bandwidth product,
output drive capability and total device power consumption
of both amplifiers can be simultaneously controlled and opti-
mized via the two programming pins I
SET(OUT)
and I
SET(IN)
.
I
SET(OUT)
The output set current (I
) is equal to the amount of
current sourced from pin 1 and establishes the class A bias-
ing current for the Darlington emitter follower output stage.
Using a single resistor from pin 1 to ground, as shown in Fig-
ure 6 this current is equal to:
The output set current can be adjusted to optimize the
amount of current the output of the amplifier can sink to drive
load capacitance and for loads connected to V
+
. The maxi-
mum output sinking current is approximately 10 times
I
. This set current is best used to reduce the total
device supply current if the amplifiers are not required to
drive small load impedances.
I
SET(IN)
The input set current I
is equal to the current flowing
into pin 8. A resistor from pin 8 to V
+
sets this current to be:
I
is most significant in controlling the AC characteris-
tics of the LM359 as it directly sets the total input stage cur-
rent of the amplifiers which determines the maximum slew
rate, the frequency of the open loop dominant pole, the input
resistance of the () input and the biasing current I
b
(). All of
DS007788-8
FIGURE 3. Biasing an Inverting AC Amplifier
DS007788-9
FIGURE 4. Biasing a Non-Inverting AC Amplifier
DS007788-10
FIGURE 5. nV
BE
Biasing
DS007788-11
FIGURE 6. Establishing the Output Set Current
DS007788-12
FIGURE 7. Establishing the Input Set Current
www.national.com
8
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