LMV841_16 Datasheet, PDF (15/38 Pages) Texas Instruments – LMV84x CMOS Input, RRIO, Low Power, Wide Supply Range, 4.5-MHz Operational Amplifiers

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7 Detailed Description
LMV841, LMV842, LMV844
LMV841-Q1, LMV842-Q1, LMV844-Q1
SNOSAT1H – OCTOBER 2006 – REVISED JULY 2016
7.1 Overview
The LMV84x devices are operational amplifiers with near-precision specifications: low noise, low temperature
drift, low offset, and rail-to-rail input and output. Possible application areas include instrumentation, medical, test
equipment, audio, and automotive applications.
Its low supply current of 1 mA per amplifier, temperature range of −40°C to 125°C, 12-V supply with CMOS input,
and the small SC70 package for the LMV841 make the LMV84x a unique op amp family and a perfect choice for
portable electronics.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Input Protection
The LMV84x have a set of anti-parallel diodes D₁ and D₂ between the input pins, as shown in Figure 34. These
diodes are present to protect the input stage of the amplifier. At the same time, they limit the amount of
differential input voltage that is allowed on the input pins.
A differential signal larger than one diode voltage drop can damage the diodes. The differential signal between
the inputs needs to be limited to ±300 mV or the input current needs to be limited to ±10 mA.
NOTE
When the op amp is slewing, a differential input voltage exists that forward-biases the
protection diodes. This may result in current being drawn from the signal source. While
this current is already limited by the internal resistors R₁ and R₂ (both 130 Ω), a resistor of
1 kΩ can be placed in the feedback path, or a 500-Ω resistor can be placed in series with
the input signal for further limitation.
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Product Folder Links: LMV841 LMV842 LMV844 LMV841-Q1 LMV842-Q1 LMV844-Q1