Datasheet
LMV651, LMV652, LMV654
SNOSAI7J –SEPTEMBER 2005–REVISED MARCH 2013
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APPLICATION INFORMATION
ADVANTAGES OF THE LMV651/LMV652/LMV654
Low Voltage and Low Power Operation
The LMV651/LMV652/LMV654 have performance specified at supply voltages of 3V and 5V. These parts are
specified to be operational at all supply voltages between 2.7V and 5.5V. The LMV651 draws a low supply
current of 116 μA, the LMV652 draws 118 μA/channel and the LMV654 draws 122 μA/channel. This family of op
amps provides the low voltage and low power amplification which is essential for portable applications.
Wide Bandwidth
Despite drawing the very low supply current of 116 µA, the LMV651/LMV652/LMV654 manage to provide a wide
unity gain bandwidth of 12 MHz. This is easily one of the best bandwidth to power ratios ever achieved, and
allows these op amps to provide wideband amplification while using the minimum amount of power. This makes
this family of parts ideal for low power signal processing applications such as portable media players and other
accessories.
Low Input Referred Noise
The LMV651/LMV652/LMV654 provide a flatband input referred voltage noise density of 17 nV/√Hz, which is
significantly better than the noise performance expected from a low power op amp. These op amps also feature
exceptionally low 1/f noise, with a very low 1/f noise corner frequency of 4 Hz. This makes these parts ideal for
low power applications which require decent noise performance, such as PDAs and portable sensors.
Ground Sensing and Rail-to-Rail Output
The LMV651/LMV652/LMV654 each have a rail-to-rail output stage, which provides the maximum possible
output dynamic range. This is especially important for applications requiring a large output swing. The input
common mode range of this family of devices includes the negative supply rail which allows direct sensing at
ground in a single supply operation.
Small Size
The small footprint of the packages for the LMV651/LMV652/LMH654 saves space on printed circuit boards, and
enables the design of smaller and more compact electronic products. Long traces between the signal source and
the op amp make the signal path susceptible to noise. By using a physically smaller package, these op amps can
be placed closer to the signal source, reducing noise pickup and enhancing signal integrity.
STABILITY OF OP AMP CIRCUITS
Stability and Capacitive Loading
If the phase margin of the LMV651/LMV652/LMV654 is plotted with respect to the capacitive load (C
L
) at its
output, it is seen that the phase margin reduces significantly if C
L
is increased beyond 100 pF. This is because
the op amp is designed to provide the maximum bandwidth possible for a low supply current. Stabilizing it for
higher capacitive loads would have required either a drastic increase in supply current, or a large internal
compensation capacitance, which would have reduced the bandwidth of the op amp. Hence, if these devices are
to be used for driving higher capacitive loads, they would have to be externally compensated.
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