Datasheet

LMV551, LMV552
www.ti.com SNOSAQ5G –FEBRUARY 2007–REVISED FEBRUARY 2013
APPLICATIONS INFORMATION
ADVANTAGES OF THE LMV551/LMV552/LMV554
Low Voltage and Low Power Operation
The LMV551/LMV552/LMV554 have performance guaranteed at supply voltages of 3V and 5V and are
guaranteed to be operational at all supply voltages between 2.7V and 5.5V. For this supply voltage range, the
LMV551/LMV552/LMV554 draw the extremely low supply current of less than 37 μA per amp.
Wide Bandwidth
The bandwidth to power ratio of 3 MHz to 37 μA per amplifier is one of the best bandwidth to power ratios ever
achieved. This makes these devices ideal for low power signal processing applications such as portable media
players and instrumentation.
Low Input Referred Noise
The LMV551/LMV552/LMV554 provide a flatband input referred voltage noise density of 70 nV/ , which is
significantly better than the noise performance expected from an ultra low power op amp. They also feature the
exceptionally low 1/f noise corner frequency of 4 Hz. This noise specification makes the
LMV551/LMV552/LMV554 ideal for low power applications such as PDAs and portable sensors.
Ground Sensing and Rail-to-Rail Output
The LMV551/LMV552/LMV554 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 includes the negative supply rail which allows direct sensing at ground in a single supply
operation.
Small Size
The small footprints of the LMV551/LMV552/LMV554 packages save space on printed circuit boards, and enable
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, the amplifiers can be
placed closer to the signal source, reducing noise pickup and enhancing signal integrity
STABILITY OF OP AMP CIRCUITS
Stability and Capacitive Loading
As seen in the Phase Margin vs. Capacitive Load graph, the phase margin reduces significantly for C
L
greater
than 100 pF. This is because the op amp is designed to provide the maximum bandwidth possible for a low
supply current. Stabilizing them 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 the LMV551/LMV552/LMV554 are to be used for driving higher capacitive loads, they will have to
be externally compensated.
Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 11
Product Folder Links: LMV551 LMV552