5

Application information

5.1

Operating voltages

The LMC7101 amplifier can operate from 3 V to 16 V. Its parameters are fully specified at 3.3 V, 5 V, and

16 V power supplies. However, the parameters are very stable in the full VCC range. Additionally, the main

specifications are guaranteed in extended temperature ranges from -40 to 125 ° C.

5.2

Rail-to-rail input

The LMC7101 device is built with two complementary PMOS and NMOS input differential pairs. The devices have

a rail-to-rail input, and the input common mode range is extended from (VCC-) - 0.1 V to (VCC+) + 0.1 V.

However, the performance of this device is clearly optimized for the PMOS differential pairs (which means from

(VCC-) - 0.1 V to (VCC+) - 1.5 V).

Beyond (VCC+) - 1.5 V, the operational amplifiers are still functional but with degraded performance, as can be

observed in the electrical characteristics section of this datasheet (mainly Vio and GBP). These performances are

suitable for a number of applications that need to be rail-to-rail.

The devices are designed to prevent phase reversal.

5.3

Long term input offset voltage drift

To evaluate product reliability, two types of stress acceleration are used:

•

Voltage acceleration, by changing the applied voltage

•

Temperature acceleration, by changing the die temperature (below the maximum junction temperature

allowed by the technology) with the ambient temperature.

The voltage acceleration has been defined based on JEDEC results, and is defined using Equation 2.

Equation 2

AFV

e

β

VS VU

–

(

)

.

=

Where:

AFV is the voltage acceleration factor

β is the voltage acceleration constant in 1/V, constant technology parameter (β = 1)

VS is the stress voltage used for the accelerated test

VU is the voltage used for the application

The temperature acceleration is driven by the Arrhenius model, and is defined in Equation 3.

Equation 3

AFT

e

Ea

k

------

1

TU

1

TS

–

=

.

Where:

AFT is the temperature acceleration factor

Ea is the activation energy of the technology based on the failure rate

k is the Boltzmann constant (8.6173 x 10-5 eV.K-1)

TU is the temperature of the die when VU is used (K)

TS is the temperature of the die under temperature stress (K)

The final acceleration factor, AF, is the multiplication of the voltage acceleration factor and the temperature

acceleration factor (Equation 4).

Equation 4

LMC7101

Application information

DS13567 - Rev 1

page 11/19