STR71XF_07 datasheet(65/77 Pages) STMICROELECTRONICS

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STR71xF

Electrical parameters

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USB Characteristics

The USB interface is USB-IF certified (Low Speed and Full Speed).

5.3.9

ADC characteristics

Subject to general operating conditions for AVDD, fPCLK2, and TA unless otherwise specified.

Notes:

Unless otherwise specified, typical data are based on TA=25°C and AVDD-AVSS=3.3V. They are given only

as design guidelines and are not tested.

Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than

10k

Ω). Data based on characterization results, not tested in production.

Calibration is needed once after each power-up.

Table 37.

ADC characteristics

Symbol

Parameter

Conditions

Min

Typ 1)

Max

Unit

fMOD

Modulator Oversampling

frequency

2.1

MHz

VAIN

Conversion voltage range 2)3)

02.5

Ilkg

Negative input leakage current on

analog pins

VIN<VSS, | IIN |<

400µA on adjacent

analog pin

µA

PBR

Passband Ripple

0.1

SINAD

S/N and Distortion

THD

Total Harmonic Distortion

ZIN

Input Impedance

fMOD = 2 MHz

Ω

CADC

Internal sample and hold capacitor

3.2

tCONV

Total Conversion time (including

sampling time)

4096/

fMOD

(max)

IADC

Normal mode

TA = 27 °C

2.5

3.0

Standby mode

TA = 27 °C

µA

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