LM359 National Semiconductor, LM359 Datasheet - Page 11

• Manufacturer Part Number: LM359
• Description: Dual/ High Speed/ Programmable/ Current Mode Norton Amplifiers
• Manufacturer: National Semiconductor

Application Hints
3. Determine maximum value for R
Optimum output DC level for maximum symmetrical swing
without clipping is:
R
This value should not be exceeded for predictable DC bias-
ing.
4. Select R
5. Select R
7.5 k is less than the calculated R
is insured.
6. Since R
Now R
7. Select C
A larger value of C
to 8 Hz and a 0.01 µF ceramic capacitor in parallel with C
will maintain high frequency gain accuracy.
8. Test for peaking of the frequency response and add a
f(MAX)
biasing
load the input termination resistance:
the reference current I
mum input frequency:
feedback “lead” capacitor to compensate if necessary.
b
can now be found:
can be found by:
f
f
s
i
= 7.5k, for the output to be biased to 5.1 V
for appropriate gain:
to provide the proper gain for the 8 Hz mini-
to be large enough so as not to appreciably
R
s
i
will allow a flat frequency response down
750 ; Let R
IN
(+) must be:
(Continued)
s
f(MAX)
= 750
f
to provide stable DC
so DC predictability
DC
,
i
11
V
Differential phase error
Differential gain error
f
A NON-INVERTING VIDEO AMPLIFIER
For this case several design considerations must be dealt
with.
• The output voltage (AC and DC) is strictly a function of
• The amplifier always has 100% current feedback so ex-
• To prevent saturating the mirror stage the total AC and
• The output’s maximum negative swing is one diode
−3 dB
o(DC)
the size of the feedback resistor and the sum of AC and
DC “mirror current” flowing into the (+) input.
ternal compensation is required. Add a small (1 pF–5 pF)
feedback capacitance to leave the amplifier’s open loop
response and slew rate unaffected.
DC current flowing into the amplifier’s (+) input should be
less than 2 mA.
above ground due to the V
low = 2.5 Hz
= 5.1V
Final Circuit Using Standard 5%
Tolerance Resistor Values:
<
Circuit Performance:
<
0.5% for 3.58 MHz f
1˚ for 3.58 MHz f
BE
diode clamp at the (−) input.
IN
IN
DS007788-19
www.national.com
DS007788-18