ST7DALI datasheet(126/141 Pages) STMICROELECTRONICS

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ST7DALI

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ADC CHARACTERISTICS (Cont’d)

Notes:

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

2) 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)

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

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

5) Refer to the offset variation in temperature below

Amplifier output offset variation

The offset is quite sensitive to temperature varia-

tions. In order to ensure a good reliability in meas-

urements, the offset must be recalibrated periodi-

cally 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:

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDD(AMP)

Amplifier operating voltage

3.6

5.5

VIN

Amplifier input voltage4)

VDD=3.6V

350

VDD=5V

500

VOFFSET

Amplifier output offset voltage5)

VDD=5V

200

VSTEP

Step size for monotonicity3)

VDD=3.6V

3.5

VDD=5V

4.89

Linearity

Output Voltage Response

Linear

Gain factor

Amplified Analog input Gain2)

Vmax

Output Linearity Max Voltage

VINmax = 430mV,

VDD=5V

3.65

3.94

Vmin

Output Linearity Min Voltage

200

Typical Offset Variation (LSB)

UNIT

-45

-20

+25

+90

°C

-12

-7

+13

LSB

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