STM32F373VC datasheet(112/128 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F37x

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Doc ID 022691 Rev 3

For fADC lower than 5 MHz, there will be a performance degradation of around 2 dB due to flicker noise increase.

If the reference value is lower than 2.4 V, there will be a performance degradation proportional to the reference supply

drop, according to this formula: 20*log10(VREF/2.4) dB

SNR, THD, SINAD parameters are valid for frequency bandwidth 20Hz - 1kHz. Input signal frequency is 300Hz (for

fADC=6MHz) and 100Hz (for fADC=1.5MHz).

Table 75.

VREFSD+ pin characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Note

VREFINT

Internal reference

voltage

Buffered embedded

reference voltage (1.2 V)

1.2

See Section 6.3.4:

Embedded

reference voltage on

page 58

Embedded reference

voltage amplified by

factor 1.5

1.8

CVREFSD+

(2) Reference voltage

filtering capacitor

VREFSD+ = VREFINT

1000

10000

RVREFSD+

Reference voltage

input impedance

Fast mode

(fADC = 6 MHz)

238



See RM0313

reference manual for

detailed description

Slow mode

(fADC = 1.5 MHz)

952

Data based on characterization results, not tested in production.

If internal reference voltage is selected then this capacitor is charged through internal resistance - typ. 300 ohm. If internal

reference source is selected through the reference voltage selection bits (REFV<>”00” in SDADC_CR1 register), the

application must first configure REFV bits and then wait for capacitor charging. Recommended waiting time is 3 ms if 1 µF

capacitor is used.

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