Datasheet

V
IN
+
-
+
-
R1
1 k:
LMV85x
Buffer
V
OUT
R11
1 k:
R2
1 k:
R2
995:
V
-
V
+
P1
10:
V
+
BUFFER
V
-
BUFFER
LMV851, LMV852, LMV854
SNOSAW1A –OCTOBER 2007–REVISED MARCH 2013 www.ti.com
APPLICATION INFORMATION
INTRODUCTION
The LMV851/LMV852/LMV854 are operational amplifiers with very good specifications, such as low offset, low
noise and a rail-to-rail output. These specifications make the LMV851/LMV852/LMV854 great choices to use in
areas such as medical and instrumentation. The low supply current is perfect for battery powered equipment.
The small packages, SC-70 package for the LMV851, the VSSOP package for the dual LMV852 and the TSSOP
package for the quad LMV854, make any of these parts a perfect choice for portable electronics. Additionally, the
EMI hardening makes the LMV851/LMV852 or LMV854 a must for almost all op amp applications. Most
applications are exposed to Radio Frequency (RF) signals such as the signals transmitted by mobile phones or
wireless computer peripherals. The LMV851/LMV852/LMV854 will effectively reduce disturbances caused by RF
signals to a level that will be hardly noticeable. This again reduces the need for additional filtering and shielding.
Using this EMI resistant series of op amps will thus reduce the number of components and space needed for
applications that are affected by EMI, and will help applications, not yet identified as possible EMI sensitive, to be
more robust for EMI.
INPUT CHARACTERISTICS
The input common mode voltage range of the LMV851/LMV852/LMV854 includes ground, and can even sense
well below ground. The CMRR level does not degrade for input levels up to 1.2V below the supply voltage. For a
supply voltage of 5V, the maximum voltage that should be applied to the input for best CMRR performance is
thus 3.8V.
When not configured as unity gain, this input limitation will usually not degrade the effective signal range. The
output is rail-to-rail and therefore will introduce no limitations to the signal range.
The typical offset is only 0.26 mV, and the TCV
OS
is 0.4 μV/°C, specifications close to precision op amps.
CMRR MEASUREMENT
The CMRR measurement results may need some clarification. This is because different setups are used to
measure the AC CMRR and the DC CMRR.
The DC CMRR is derived from ΔV
OS
versus ΔV
CM
. This value is stated in the tables, and is tested during
production testing.
The AC CMRR is measured with the test circuit shown in Figure 49.
Figure 49. AC CMRR Measurement Setup
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Product Folder Links: LMV851 LMV852 LMV854