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LM359 Scheda tecnica(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Il numero della parte LM359
Spiegazioni elettronici  Dual, High Speed, Programmable, Current Mode Norton Amplifiers
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM359 Scheda tecnica(HTML) 8 Page - National Semiconductor (TI)

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Application Hints (Continued)
The following figures illustrate typical biasing schemes for
AC amplifiers using the LM359:
The nV
BE 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 ISET(IN).
I
SET(OUT)
The output set current (I
SET(OUT)) 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
ISET(OUT) . 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
SET(IN) is equal to the current flowing
into pin 8. A resistor from pin 8 to V
+ sets this current to be:
I
SET(IN) 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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