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PDF LME49990 Data sheet ( Hoja de datos )
| Número de pieza | LME49990 | |
| Descripción | Ultra-low Noise Operational Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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LME49990 Overture®
E-Series
January 8, 2010
Ultra-low Distortion, Ultra-low Noise Operational Amplifier
General Description
The LME49990 is part of the ultra-low distortion, low noise,
high slew rate operational amplifier series optimized and fully
specified for high performance, high fidelity applications. The
LME49990 combines low voltage noise density (0.9nV/√Hz)
with vanishing low THD+N (0.00001%). The LME49990 has
a high slew rate of ±22V/μs and an output current capability
of ±27mA. It drives 600Ω loads to within 2V of either power
supply voltage.
The LME49990’s outstanding Gain (135dB), CMRR (137dB),
PSRR (144dB), and VOS (130μV) give the amplifier excellent
operational amplifier DC performance. The LME49990 has a
wide supply range of ±5V to ±18V. The LME49990 is unity
gain stable and is available in an 8-lead narrow body SOIC.
Key Specifications
■ Input Noise Density (f = 1kHz)
■ THD+N
(AV = 1, VOUT = 3VRMS, fIN = 1kHz)
RL = 600Ω
■ 1/f Corner Frequency
■ Slew Rate
■ Gain Bandwidth
(AV = 104, RL = 2kΩ,
■ PSRR
f = 90kHz)
■ CMRR
■ Power Supply Voltage Range
0.9nV/√Hz (typ)
1.3nV/√Hz (max)
0.00001%
43Hz (typ)
±22V/μs (max)
110MHz (typ)
144dB (typ)
137dB (typ)
±5V to ±18V
Features
■ Easily drives 600Ω load
■ Output short circuit protection
Applications
■ Ultra high quality audio signal processing
■ Active Filters
■ Preamplifiers
■ Spectrum analyzers
■ Ultrasound preamplifiers
■ Sigma-Delta ADC/DAC buffers
300597e6
FIGURE 1. Voltage Noise Spectral Density
Overture® is a registered trademark of National Semiconductor.
© 2010 National Semiconductor Corporation 300597
300597d7
FIGURE 2. THD+N vs Frequency
www.national.com
1 page  
Typical Performance Characteristics
THD+N vs Output Voltage
VCC = –VEE = 15V, RL = 2kΩ
THD+N vs Output Voltage
VCC = –VEE = 18V, RL = 2kΩ
THD+N vs Output Voltage
VCC = –VEE = 5V, RL = 2kΩ
300597e9
THD+N vs Output Voltage
VCC = –VEE = 15V, RL = 600Ω
300597f1
THD+N vs Output Voltage
VCC = –VEE = 18V, RL = 600Ω
300597e7
THD+N vs Output Voltage
VCC = –VEE = 5V, RL = 600Ω
300597f0
300597f2
5
300597e8
www.national.com
5 Page 
Application Information
SETTLING TIME AND SLEW RATE MEASUREMENTS
The settling time of LME49990 may be verified using the test
circuit in Figure 6. The LME49990 is connected for inverting
operation, and the output voltage is summed with the input
voltage step. When the LME49990’s output voltage is equal
to the input voltage, the voltage on the PROBE 1 will be zero.
Any voltage appearing at this point will represent an error. And
the settling time is equal to the time required for the error sig-
nal displayed on the oscilloscope to decay to less than one-
half the necessary accuracy (See Settling Time – Output
Swing photo). For a 10V input signal, settling time to 0.01%
(1mV) will occur when the displayed error is less than 0.5mV.
Since settling time is strongly dependent on slew rate, settling
will be faster for smaller signal swings. The LME49990’s in-
verting slew rate is faster than its non-inverting slew rate, so
settling will be faster for inverting applications, as well.
It is important to note that the oscilloscope input amplifier may
be overdriven during a settling time measurement, so the os-
cilloscope must be capable of recovering from overdrive very
quickly. The signal generator used for this measurement must
be able to drive 50Ω with a very clean ±10VPP square wave.
The Slew Rate of LME49990 tells how fast it responses to a
transient or a step input. It may be measured by the test circuit
in Figure 7. The Slew Rate of LME49990 is specified in close-
loop gain = -1 when the output driving a 1kΩ load at 20VPP.
The LME49990 behaves very stable in shape step response
and have a minimal ringing in both small and large signal step
response (See Typical Performance Characteristic). The slew
rate typical value reach as high as ±18V/μS was measured
when the output reach -20V refer to the start point when input
voltage equals to zero.
FIGURE 6: Settling Time Test Circuit
300597c1
FIGURE 7: Slew Rate Test Circuit
300597c2
11 www.national.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LME49990.PDF ] | |
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