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PDF LM359J Data sheet ( Hoja de datos )
| Número de pieza | LM359J | |
| Descripción | Dual/ High Speed/ Programmable/ Current Mode Norton Amplifiers | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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October 1998
LM359
Dual, High Speed, Programmable, Current Mode (Norton)
Amplifiers
General Description
The LM359 consists of two current differencing (Norton) in-
put amplifiers. Design emphasis has been placed on obtain-
ing high frequency performance and providing user program-
mable amplifier operating characteristics. Each amplifier is
broadbanded to provide a high gain bandwidth product, fast
slew rate and stable operation for an inverting closed loop
gain of 10 or greater. Pins for additional external frequency
compensation are provided. The amplifiers are designed to
operate from a single supply and can accommodate input
common-mode voltages greater than the supply.
Applications
n General purpose video amplifiers
n High frequency, high Q active filters
n Photo-diode amplifiers
n Wide frequency range waveform generation circuits
n All LM3900 AC applications work to much higher
frequencies
Features
n User programmable gain bandwidth product, slew rate,
input bias current, output stage biasing current and total
device power dissipation
n High gain bandwidth product (ISET = 0.5 mA)
400 MHz for AV = 10 to 100
30 MHz for AV = 1
n High slew rate (ISET = 0.5 mA)
60 V/µs for AV = 10 to 100
30 V/µs for AV = 1
n Current differencing inputs allow high common-mode
input voltages
n Operates from a single 5V to 22V supply
n Large inverting amplifier output swing, 2 mV to VCC −
2V
n Low spot noise,
for f > 1 kHz
Typical Application
Connection Diagram
Dual-In-Line Package
• AV = 20 dB
• −3 dB bandwidth = 2.5 Hz to 25 MHz
• Differential phase error < 1˚ at 3.58 MHz
• Differential gain error < 0.5% at 3.58 MHz
DS007788-1
DS007788-2
Top View
Order Number LM359J, LM359M or LM359N
See NS Package Number J14A, M14A or N14A
© 1999 National Semiconductor Corporation DS007788
www.national.com
1 page  
Typical Performance Characteristics
Open Loop Gain
Open Loop Gain
Open Loop Gain
DS007788-39
Gain Bandwidth Product
DS007788-40
Note: Shaded area refers to LM359
Slew Rate
DS007788-41
Gain and Phase
Feedback Gain = − 100
DS007788-42
DS007788-43
Inverting Input Bias Current
Inverting Input Bias Current
Mirror Gain
DS007788-44
DS007788-45
DS007788-46
Note: Shaded area refers to LM359
DS007788-47
5 www.national.com
5 Page 
Application Hints (Continued)
3. Determine maximum value for Rf to provide stable DC
biasing
Optimum output DC level for maximum symmetrical swing
without clipping is:
Final Circuit Using Standard 5%
Tolerance Resistor Values:
Rf(MAX) can now be found:
This value should not be exceeded for predictable DC bias-
ing.
4. Select Rs to be large enough so as not to appreciably
load the input termination resistance:
Rs ≥ 750Ω; Let Rs = 750Ω
5. Select Rf for appropriate gain:
Circuit Performance:
DS007788-18
7.5 kΩ is less than the calculated Rf(MAX) so DC predictability
is insured.
6. Since Rf = 7.5k, for the output to be biased to 5.1 VDC,
the reference current IIN(+) must be:
Now Rb can be found by:
7. Select Ci to provide the proper gain for the 8 Hz mini-
mum input frequency:
A larger value of Ci will allow a flat frequency response down
to 8 Hz and a 0.01 µF ceramic capacitor in parallel with Ci
will maintain high frequency gain accuracy.
8. Test for peaking of the frequency response and add a
feedback “lead” capacitor to compensate if necessary.
Vo(DC) = 5.1V
Differential phase error < 1˚ for 3.58 MHz fIN
Differential gain error < 0.5% for 3.58 MHz fIN
f−3 dB low = 2.5 Hz
DS007788-19
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 size of the feedback resistor and the sum of AC and
DC “mirror current” flowing into the (+) input.
• The amplifier always has 100% current feedback so ex-
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.
• To prevent saturating the mirror stage the total AC and
DC current flowing into the amplifier’s (+) input should be
less than 2 mA.
• The output’s maximum negative swing is one diode
above ground due to the VBE diode clamp at the (−) input.
11 www.national.com
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LM359J.PDF ] | |
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