LMC7101AIM5X National Semiconductor, LMC7101AIM5X Datasheet - Page 17

• Manufacturer Part Number: LMC7101AIM5X
• Description: IC,Operational Amplifier,SINGLE,CMOS,TSOP,5PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LMC7101AIM5X

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Application Information
1.0 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 re-
duced.
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 kΩ load at 5V supplies. This makes the Tiny an
excellent for audio, modems, and low frequency signal pro-
cessing.
Low Supply Current
The typical 0.5 mA supply current of the LMC7101 extends
battery life in portable applications, and may allow the reduc-
tion of the size of batteries in some applications.
Wide Voltage Range
The LMC7101 is characterized at 15V, 5V and 3V. Perfor-
mance data is provided at these popular voltages. This wide
voltage range makes the LMC7101 a good choice for de-
vices where the voltage may vary over the life of the batter-
ies.
2.0 INPUT COMMON MODE
Voltage Range
The LMC7101 does not exhibit phase inversion when an
input voltage exceeds the negative supply voltage. Figure 1
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 2, can cause excessive
current to flow in or out of the input pins, adversely affecting
reliability.
17
Applications that exceed this rating must externally limit the
maximum input current to
shown in Figure 3.
3.0 RAIL-TO-RAIL OUTPUT
The approximate output resistance of the LMC7101 is 180Ω
sourcing and 130Ω sinking at V
and 80Ω sinking at V
resistance, maximum output voltage swing can be estimated
as a function of load.
FIGURE 1. An Input Voltage Signal Exceeds the
Exceeds the 3V Supply in Figure 3 Causing
FIGURE 3. R
FIGURE 2. A
Voltages Exceeding the Supply Voltage
LMC7101 Power Supply Voltages with
No Phase Inversion Due to R
No Output Phase Inversion
I
Input Current Protection for
S
±
7.5V Input Signal Greatly
= 5V. Using the calculated output
±
5 mA with an input resistor as
S
= 3V and 110Ω sourcing
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