TSV792IST datasheet(20/36 Pages) STMICROELECTRONICS

20 / 36 page

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

acceleration factor (Equation 4).

AF=AFT.AFV

(4)

AF is calculated using the temperature and voltage defined in the mission profile of the product. The AF value can

then be used in Equation x to calculate the number of months of use equivalent to 1000 hours of reliable stress

duration.

Months = AF × 1000 h × 12 months / (24 h × 365.25 days)

To evaluate the op-amp reliability, a follower stress condition is used where VCC is defined as a function of the

maximum operating voltage and the absolute maximum rating (as recommended by JEDEC rules). The Vio drift

(in µV) of the product after 1000 h of stress is tracked with parameters at different measurement conditions (see

Equation 5).

VCC=maxVop witℎVicm=Vcc2

(5)

The long term drift parameter ΔVio (in µV.month-1/2), estimating the reliability performance of the product, is

obtained using the ratio of the Vio (input offset voltage value) drift over the square root of the calculated number of

months (Equation 6).

∆Vio=Viodrift

montℎs

(6)

Where Vio drift is the measured drift value in the specified test conditions after 1000 h stress duration.

The Vio final drift, in µV, to be measured on the device in real operation conditions can be computed from

Equation 7.

Vio final drifttop,Top,VCC =∆Vio. top.eβ.VCC−VCC nom.eEak. 1297− 1Top

(7)

Where:

ΔVio is the long term drift parameter in µV.√month

top is the operating time seen by the device, in months

Top is the operating temperature

VCC is the power supply during operating time

VCC nom is the nominal VCC at which the ΔVio is computed (5 V for TSV79x)

Ea is the activation energy of the technology (here 0.7 eV).

5.4

Unused channel

When one of the two channels of the TSV792 is not used, it must be properly connected in order to avoid

internal oscillations that can negatively impact the signal integrity on the other channel, as well as the current

consumption. Two different configurations can be used:

Gain configuration: the channel can be set in gain, the input can be set to any voltage within the Vicm operating

range.

Comparator configuration: the channel can be set to a comparator configuration (without negative feedback). In

this case, positive and negative inputs can be set to any value provided these values are significantly different

(100 mV or more, to avoid oscillation between positive and negative state).

5.5

EMI rejection

The electromagnetic interference (EMI) rejection ratio, or EMIRR, describes the EMI immunity of operational

amplifiers. An adverse effect that is common to many op-amps is a change in the offset voltage as a result of RF

signal rectification. EMIRR is defined in Equation 8:

EMIRR=20.log Vin pp∆Vio

(8)

TSV791, TSV792

Unused channel

DS13480 - Rev 1

page 20/36

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