LMC7111_14 Datasheet, PDF (15/26 Pages) National Semiconductor (TI) – LMC7111 Tiny CMOS Operational Amplifier with Rail-to-Rail Input and Output

LMC7111
www.ti.com
SNOS753E – AUGUST 1999 – REVISED MARCH 2013
APPLICATION INFORMATION
BENEFITS OF THE LMC7111 TINY AMP
Size
The small footprint of the SOT-23 packaged Tiny amp, (0.120 x 0.118 inches, 3.05 x 3.00 mm) saves space on
printed circuit boards, and enable the design of smaller electronic products. Because they are easier to carry,
many customers prefer smaller and lighter products.
Height
The height (0.056 inches, 1.43 mm) of the Tiny amp makes it possible to use it in PCMCIA type III cards.
Signal Integrity
Signals can pick up noise between the signal source and the amplifier. By using a physically smaller amplifier
package, the Tiny amp can be placed closer to the signal source, reducing noise pickup and increasing signal
integrity. The Tiny amp can also be placed next to the signal destination, such as a buffer for the reference of an
analog to digital converter.
Simplified Board Layout
The Tiny amp can simplify board layout in several ways. First, by placing an amp where amps are needed,
instead of routing signals to a dual or quad device, long pc traces may be avoided.
By using multiple Tiny amps instead of duals or quads, complex signal routing and possibly crosstalk can be
reduced.
DIPs available for prototyping
LMC7111 amplifiers packaged in conventional 8-pin dip packages can be used for prototyping and evaluation
without the need to use surface mounting in early project stages.
Low Supply Current
The typical 25 μA supply current of the LMC7111 extends battery life in portable applications, and may allow the
reduction of the size of batteries in some applications.
Wide Voltage Range
The LMC7111 is characterized at 2.7V, 3V, 3.3V, 5V and 10V. Performance data is provided at these popular
voltages. This wide voltage range makes the LMC7111 a good choice for devices where the voltage may vary
over the life of the batteries.
INPUT COMMON MODE VOLTAGE RANGE
The LMC7111 does not exhibit phase inversion when an input voltage exceeds the negative supply voltage.
The absolute maximum input voltage is 300 mV beyond either rail at room temperature. Voltages greatly
exceeding this maximum rating can cause excessive current to flow in or out of the input pins, adversely affecting
reliability.
Applications that exceed this rating must externally limit the maximum input current to ±5 mA with an input
resistor as shown in Figure 52.
Figure 52. R_I Input Current Protection for
Voltages Exceeding the Supply Voltage
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