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PDF LMV321 Data sheet ( Hoja de datos )
| Número de pieza | LMV321 | |
| Descripción | General Purpose / Low Voltage / Rail-to-Rail Output Operational Amplifiers | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LMV321 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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August 1999
LMV321 Single/ LMV358 Dual/ LMV324 Quad
General Purpose, Low Voltage, Rail-to-Rail Output
Operational Amplifiers
General Description
The LMV358/324 are low voltage (2.7–5.5V) versions of the
dual and quad commodity op amps, LM358/324, which cur-
rently operate at 5–30V. The LMV321 is the single version.
The LMV321/358/324 are the most cost effective solutions
for the applications where low voltage operation, space sav-
ing and low price are needed. They offer specifications that
meet or exceed the familiar LM358/324. The
LMV321/358/324 have rail-to-rail output swing capability and
the input common-mode voltage range includes ground.
They all exhibit excellent speed-power ratio, achieving
1 MHz of bandwidth and 1 V/µs of slew rate with low supply
current.
The LMV321 is available in space saving SC70-5, which is
approximately half the size of SOT23-5. The small package
saves space on pc boards, and enables the design of small
portable electronic devices. It also allows the designer to
place the device closer to the signal source to reduce noise
pickup and increase signal integrity.
The chips are built with National’s advanced submicron
silicon-gate BiCMOS process. The LMV321/358/324 have
bipolar input and output stages for improved noise perfor-
mance and higher output current drive.
Features
(For V+ = 5V and V− = 0V, Typical Unless Otherwise Noted)
n Guaranteed 2.7V and 5V Performance
n No Crossover Distortion
n Space Saving Package
SC70-5 2.0x2.1x1.0mm
n Industrial Temp.Range
−40˚C to +85˚C
n Gain-Bandwidth Product
1MHz
n Low Supply Current
LMV321
130µA
LMV358
210µA
LMV324
410µA
n Rail-to-Rail Output Swing
@ 10kΩ Load
V+−10mV
V−+65mV
n VCM
−0.2V to V+ −0.8V
Applications
n Active Filters
n General Purpose Low Voltage Applications
n General Purpose Portable Devices
Connection Diagrams
5-Pin SC70-5/SOT23-5
14-Pin SO/TSSOP
DS100060-1
Top View
8-Pin SO/MSOP
DS100060-3
Top View
DS100060-2
Top View
© 1999 National Semiconductor Corporation DS100060
www.national.com
1 page  
5V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T J = 25˚C, V+ = 5V, V− = 0V, VCM = 2.0V, VO = V+/2 and R L > 1 MΩ.
Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 6)
Limit
(Note 7)
Units
SR Slew Rate
(Note 9)
1
V/µs
GBWP
Φm
Gm
en
Gain-Bandwidth Product
Phase Margin
Gain Margin
Input-Referred Voltage Noise
CL = 200 pF
f = 1 kHz,
1
60
10
39
MHz
Deg
dB
in Input-Referred Current Noise f = 1 kHz
0.21
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2: Human body model, 1.5 kΩ in series with 100 pF. Machine model, 0Ω in series with 200 pF.
Note 3: Shorting output to V+ will adversely affect reliability.
Note 4: Shorting output to V- will adversely affect reliability.
Note 5: The maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD =
(TJ(max)–TA)/θJA. All numbers apply for packages soldered directly into a PC board.
Note 6: Typical values represent the most likely parametric norm.
Note 7: All limits are guaranteed by testing or statistical analysis.
Note 8: RL is connected to V-. The output voltage is 0.5V ≤ VO ≤ 4.5V.
Note 9: Connected as voltage follower with 3V step input. Number specified is the slower of the positive and negative slew rates.
Note 10: All numbers are typical, and apply for packages soldered directly onto a PC board in still air.
Typical Performance Characteristics Unless otherwise specified, VS = +5V, single supply, TA = 25˚C.
Supply Current vs Supply
Voltage (LMV321)
Input Current vs
Temperature
Sourcing Current vs
Output Voltage
DS100060-73
Sourcing Current vs
Output Voltage
DS100060-A9
Sinking Current vs
Output Voltage
Sinking Current vs
Output Voltage
DS100060-69
DS100060-68
DS100060-70
5
DS100060-71
www.national.com
5 Page 
Application Notes (Continued)
DS100060-4
FIGURE 3. Indirectly Driving A Capacitive Load Using
Resistive Isolation
In Figure 3 , the isolation resistor RISO and the load capacitor
CL form a pole to increase stability by adding more phase
margin to the overall system. The desired performance de-
pends on the value of RISO. The bigger the RISO resistor
value, the more stable Vout will be. Figure 4 is an output
waveform of Figure 3 using 620Ω for RISO and 510 pF for
CL..
DS100060-5
FIGURE 5. Indirectly Driving A Capacitive Load with
DC Accuracy
3.0 Input Bias Current Cancellation
The LMV321/358/324 family has a bipolar input stage. The
typical input bias current of LMV321/358/324 is 15 nA with
5V supply. Thus a 100 kΩ input resistor will cause 1.5 mV of
error voltage. By balancing the resistor values at both invert-
ing and non-inverting inputs, the error caused by the ampli-
fier’s input bias current will be reduced. The circuit in Figure
6 shows how to cancel the error caused by input bias
current.
Time (2µs/div)
DS100060-99
FIGURE 4. Pulse Response of the LMV324 Circuit in
Figure 3
The circuit in Figure 5 is an improvement to the one in Figure
3 because it provides DC accuracy as well as AC stability. If
there were a load resistor in Figure 3, the output would be
voltage divided by RISO and the load resistor. Instead, in Fig-
ure 5, RF provides the DC accuracy by using feed-forward
techniques to connect VIN to RL. Caution is needed in choos-
ing the value of RF due to the input bias current of the
LMV321/358/324. CF and RISO serve to counteract the loss
of phase margin by feeding the high frequency component of
the output signal back to the amplifier’s inverting input,
thereby preserving phase margin in the overall feedback
loop. Increased capacitive drive is possible by increasing the
value of C F . This in turn will slow down the pulse response.
DS100060-6
FIGURE 6. Cancelling the Error Caused by Input Bias
Current
4.0 Typical Single-Supply Application Circuits
4.1 Difference Amplifier
The difference amplifier allows the subtraction of two volt-
ages or, as a special case, the cancellation of a signal com-
mon to two inputs. It is useful as a computational amplifier, in
making a differential to single-ended conversion or in reject-
ing a common mode signal.
11 www.national.com
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LMV321.PDF ] | |
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