ST7FLITE25F1B6 datasheet(146/166 Pages) STMICROELECTRONICS

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Electrical characteristics

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Doc ID 8349 Rev 5

Figure 92. Amplifier noise vs voltage

13.11.1

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.

Table 87 gives the typical offset variation over temperature.

Table 86.

ADC characteristics(1)

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

Symbol

Parameter

Conditions

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=3.6V

−

350

VDD=5V

−

500

VOFFSET

Amplifier output offset

voltage(3)

Refer to the offset variation in temperature below.

VDD=5V

−

200

−

VSTEP

Step size for monotonicity(4)

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

VDD=3.6V

3.5

−−

VDD=5V

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=430mV).

−−

Vmax

Output linearity max voltage

VINmax = 430mV,

VDD=5V

−

3.65

3.94

Vmin

Output linearity min voltage

−

200

−

Vin

Vout (ADC input)

Vmax

Vmin

430mV

Noise

(OPAMP input)

Table 87.

Typical offset variation over temperature

Typical offset variation (LSB)

Unit

-45

-20

+25

+90

°C

-12

-7

−

+13

LSB

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