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PDF LMV722 Data sheet ( Hoja de datos )
| Número de pieza | LMV722 | |
| Descripción | 10MHz / Low Noise / Low Voltage / and Low Power Operational Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LMV722 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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August 1999
LMV721/LMV722
10MHz, Low Noise, Low Voltage, and Low Power
Operational Amplifier
General Description
The LMV721 (Single) and LMV722 (Dual) are low noise, low
voltage, and low power op amps, that can be designed into
a wide range of applications. The LMV721/LMV722 has a
unity gain bandwidth of 10MHz, a slew rate of 5V/us, and a
quiescent current of 930uA/amplifier at 2.2V.
The LMV721/722 are designed to provide optimal perfor-
mance in low voltage and low noise systems. They provide
rail-to-rail output swing into heavy loads. The input
common-mode voltage range includes ground, and the
maximum input offset voltage are 3.5mV (Over Temp.) for
the LMV721/LMV722. Their capacitive load capability is also
good at low supply voltages. The operating range is from
2.2V to 5.5V.
The chip is built with National’s advanced Submicron
Silicon-Gate BiCMOS process. The single version, LMV721,
is available in 5 pin SOT23-5 and a SC-70 (new) package.
The dual version, LMV722, is available in a SO-8 and
MSOP-8 package.
Features
(For Typical, 5 V Supply Values; Unless Otherwise Noted)
n Guaranteed 2.2V and 5.0V Performance
n Low Supply Current LMV721/2 930µA/amplifier @2.2V
n High Unity-Gain Bandwidth 10MHz
n Rail-to-Rail Output Swing
@600Ω load 120mV from either rail at 2.2V
@2kΩ load 50mV from either rail at 2.2V
n Input Common Mode Voltage Range Includes Ground
n Silicon Dust™, SC70-5 Package 2.0x2.0x1.0 mm
n Input Voltage Noise 9 @ f = 1KHz
Applications
n Cellular an Cordless Phones
n Active Filter and Buffers
n Laptops and PDAs
n Battery Powered Electronics
Connection Diagrams
5-Pin SC-70/SOT23-5
8-Pin SO/MSOP
DS100922-99
Top View
DS100922-63
Top View
Silicon Dust™ is a trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS100922
www.national.com
1 page  
5V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C. V+ = 5V, V− = 0V, VCM = V+/2, VO = V+/2 and R L > 1 MΩ.
Boldface limits apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
Units
SR Slew Rate
(Note 7)
5.25
V/µs
min
GBW
Gain-Bandwdth Product
10.0
MHz
Φm Phase Margin
Gm Gain Margin
en
Input-Related Voltage Noise
f = 1 kHz
72 Deg
−11 dB
8.5
in
Input-Referred Current Noise
f = 1 kHz
0.2
THD
Total Harmonic Distortion
f = 1kHz, AV = 1
RL = 600Ω, VO = 1 VPP
0.001
%
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, 200Ω in series with 100 pF.
Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature of 150˚C. Output currents in excess of 30 mA over long term may adversely affect reliability.
Note 4: The maximum power dissipation is a function of TJ(max), θJA, and TA . The maximum allowable power dissipation at any ambient temperature is
P D = (TJ(max)–T A)/θJA. All numbers apply for packages soldered directly into a PC board.
Note 5: Typical Values represent the most likely parametric norm.
Note 6: All limits are guaranteed by testing or statistical analysis.
Note 7: Connected as voltage follower with 1V step input. Number specified is the slower of the positive and negative slew rate.
5 www.national.com
5 Page 
Application Notes (Continued)
DS100922-44
FIGURE 11. A Battery Powered Microphone Preamplifier
Here is a LMV721 used as a microphone preamplifier. Since the LMV721 is a low noise and low power op amp, it makes it an
ideal candidate as a battery powered microphone preamplifier. The LMV721 is connected in an inverting configuration. Resistors,
R1 = R2 = 4.7kΩ, sets the reference half way between VCC = 3V and ground. Thus, this configures the op amp for single supply
use. The gain of the preamplifier, which is 50 (34dB), is set by resistors R3 = 10kΩ and R4 = 500kΩ. The gain bandwidth product
for the LMV721 is 10 MHz. This is sufficient for most audio application since the audio range is typically from 20 Hz to 20kHz. A
resistor R5 = 5kΩ is used to bias the electret microphone. Capacitors C1 = C2 = 4.7µF placed at the input and output of the op
amp to block out the DC voltage offset.
11 www.national.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LMV722.PDF ] | |
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