LMC7101, LMC7101Q

SNOS719F – SEPTEMBER 1999 – REVISED MARCH 2013

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APPLICATION INFORMATION

BENEFITS OF THE LMC7101 TINY AMP

Size

The small footprint of the SOT-23-5 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.

Low THD

The high open loop gain of the LMC7101 amp allows it to achieve very low audio distortion—typically 0.01% at

10 kHz with a 10 k

Ω load at 5V supplies. This makes the Tiny an excellent for audio, modems, and low

frequency signal processing.

Low Supply Current

The typical 0.5 mA supply current of the LMC7101 extends battery life in portable applications, and may allow

the reduction of the size of batteries in some applications.

Wide Voltage Range

The LMC7101 is characterized at 15V, 5V and 3V. Performance data is provided at these popular voltages. This

wide voltage range makes the LMC7101 a good choice for devices where the voltage may vary over the life of

the batteries.

INPUT COMMON MODE

Voltage Range

The LMC7101 does not exhibit phase inversion when an input voltage exceeds the negative supply voltage.

Figure 62 shows an input voltage exceeding both supplies with no resulting phase inversion of the output.

The absolute maximum input voltage is 300 mV beyond either rail at room temperature. Voltages greatly

exceeding this maximum rating, as in Figure 63, can cause excessive current to flow in or out of the input pins,

adversely affecting reliability.

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