LM359M National Semiconductor, LM359M Datasheet - Page 11

• Manufacturer Part Number: LM359M
• Description: IC AMP DUAL PROG CUR MODE 14SOIC
• Manufacturer: National Semiconductor

Specifications of LM359M

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Slew Rate: 60 V/µs
• Gain Bandwidth Product: 400MHz
• Current - Input Bias: 8µA
• Current - Supply: 18.5mA
• Current - Output / Channel: 40mA
• Voltage - Supply, Single/dual (±): 5 V ~ 22 V, ±2.5 V ~ 11 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• -3db Bandwidth: -
• Voltage - Input Offset: -
• Other names: *LM359M

Application Hints
AMPLIFIER DESIGN EXAMPLES
The ability of the LM359 to provide gain at frequencies
higher than most monolithic amplifiers can provide makes it
most useful as a basic broadband amplification stage. The
design of standard inverting and non-inverting amplifiers,
though different than standard op amp design due to the
current differencing inputs, also entail subtle design differ-
ences between the two types of amplifiers. These differ-
ences will be best illustrated by design examples. For these
examples a practical video amplifier with a passband of 8 Hz
to 10 MHz and a gain of 20 dB will be used. It will be
assumed that the input will come from a 75Ω source and
proper signal termination will be considered. The supply
voltage is 12 V
operating current, I
AN INVERTING VIDEO AMPLIFIER
1. Basic circuit configuration:
2. Determine the required I
3. Determine maximum value for R
curves for gain bandwidth product.
For a flat response to 10 MHz a closed loop response to
two octaves above 10 MHz (40 MHz) will be sufficient.
Actual GBW = 10 x 40 MHz = 400 MHz
I
biasing
Optimum output DC level for maximum symmetrical
swing without clipping is:
SET
required = 0.5 mA
GBW
DC
MIN
SET
and single resistor programming of the
= 10 x 10 MHz = 100 MHz
, will be used for simplicity.
SET
(Continued)
from the characteristic
f
to provide stable DC
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4. Select R
5. Select R
6. Since R
7. Select C
8. Test for peaking of the frequency response and add a
R
This value should not be exceeded for predictable DC
biasing.
load the input termination resistance:
7.5 kΩ is less than the calculated R
ability is insured.
the reference current I
Now R
mum input frequency:
A larger value of C
down to 8 Hz and a 0.01 µF ceramic capacitor in parallel
with C
feedback “lead” capacitor to compensate if necessary.
f(MAX)
i
b
will maintain high frequency gain accuracy.
can now be found:
f
f
can be found by:
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
≥ 750Ω; Let R
i
will allow a flat frequency response
IN
(+) must be:
s
= 750Ω
f(MAX)
so DC predict-
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DC
,