ST7DALIF2 datasheet(157/171 Pages) STMICROELECTRONICS

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ST7DALIF2

Electrical characteristics

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20.11.1

Amplifier output offset variation

The offset is quite sensitive to temperature variations. In order to ensure a good reliability in

measurements, the offset must be recalibrated periodically i.e. during power on or whenever

the device is reset depending on the customer application and during temperature variation.

The table below gives the typical offset variation over temperature:

Table 91.

Amplifier characteristics

Symbol

Parameter

Conditions(1)

Data based on characterization results over the whole temperature range, not tested in production.

Min

Typ

Max

Unit

VDD(AMP)

Amplifier operating voltage

3.6

5.5

VIN

Amplifier input voltage(2)

Please refer to the Application Note AN1830 for details of TE% vs Vin.

VDD=3.6 V

350

VDD=5 V

500

VOFFSET

Amplifier output offset

voltage(3)

Refer to the offset variation in temperature below

VDD=5 V

200

VSTEP

Step size for monotonicity(4)

Monotonicity guaranteed if VIN increases or decreases in steps of min. 5 mV.

VDD=3.6 V

3.5

VDD=5 V

4.89

Linearity

Output Voltage Response

Linear

Gain factor

Amplified Analog input

Gain(5)

For precise conversion results it is recommended to calibrate the amplifier at the following two points:

- Offset at VINmin = 0V

- Gain at full scale (for example VIN=430 mV)

Vmax

Output Linearity Max Voltage V

INmax = 430 mV,

VDD=5 V

3.65

3.94

Vmin

Output Linearity Min Voltage

200

Table 92.

Amplifier offset variation over temperature

Typical offset variation (LSB)

Unit

-45

-20

+25

+90

°C

-12

-7

+13

LSB

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