STM32U545NET3QTR datasheet(63/283 Pages) STMICROELECTRONICS

63 / 283 page

DS14216 Rev 1

63/283

STM32U545xx

Functional overview

3.29

Operational amplifier (OPAMP)

The devices embed one operational amplifier with external or internal follower routing and

PGA capability.

The operational amplifier features:

•

Low-input bias current

•

Low-offset voltage

•

Low-power mode

•

Rail-to-rail input

3.30

Multi-function digital filter (MDF) and audio digital filter (ADF)

The table below lists the set of features implemented into the MDF and the ADF.

3.30.1

Multi-function digital filter (MDF)

The MDF is a high-performance module dedicated to the connection of external sigma-delta

(Σ∆) modulators. It is mainly targeted for the following applications:

•

audio capture signals

•

motor control

•

metering

The MDF features two digital serial interfaces (SITFx) and digital filters (DFLTx) with flexible

digital processing options to offer up to 24-bit final resolution.

The DFLTx of the MDF also include the filters of the ADF (audio digital filter).

The MDF can receive, via its serial interfaces, streams coming from various digital sensors.

Table 18. MDF features

MDF modes/features(1)

1. X = supported.

ADF1

MDF1

Number of filters (DFLTx) and serial interfaces (SITFx)

ADF_CKI0 / MDF_CKIy connected to pins

Sound activity detection (SAD)

RXFIFO depth (number of 24-bit words)

ADC connected to ADCITF1

ADC1

ADC connected to ADCITF2

Motor dedicated features (SCD, OLD, OEC, INT, snapshot, break)

Main path with CIC4, CIC5

Main path with CIC1,2, 3 or FastSinc

RSFLT, HPF, SAT, SCALE, DLY, Discard functions

Autonomous in Stop mode

X(2)

2. Stop 0, Stop 1 and Stop 2 modes only.

X(3)

3. Stop 0 and Stop 1 modes only.

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