STM32L151VD datasheet(119/140 Pages) STMICROELECTRONICS

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STM32L151xD STM32L152xD

Electrical characteristics

Doc ID 022027 Rev 6

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Figure 40.

12-bit buffered /non-buffered DAC

The DAC integrates an output buffer that can be used to reduce the output impedance and to drive external loads directly

without the use of an external operational amplifier. The buffer can be bypassed by configuring the BOFFx bit in the

DAC_CR register.

6.3.21

Operational amplifier characteristics

Difference between the value measured at Code (0x001) and the ideal value.

Difference between ideal slope of the transfer function and measured slope computed from code 0x000 and 0xFFF when

buffer is OFF, and from code giving 0.2 V and (VDDA – 0.2) V when buffer is ON.

In buffered mode, the output can overshoot above the final value for low input code (starting from min value).

R LOAD

C LOAD

Buffered/Non-buffered DAC

DAC_OUTx

Buffer(1)

12-bit

digital to

analog

converter

ai17157V2

Table 68.

Operational amplifier characteristics

Symbol

Parameter

Condition(1)

Min(2)

Typ

Max(2)

Unit

CMIR

Common mode input range

VDD

VIOFFSET

Input offset voltage

Maximum

calibration range

±15

After offset

calibration

±1.5

ΔVIOFFSET

Input offset voltage

drift

Normal mode

±40

µV/°C

Low power mode

±80

IIB

Input current bias

Dedicated input

75 °C

General purpose

input

ILOAD

Drive current

Normal mode

500

µA

Low power mode

100

IDD

Consumption

Normal mode

No load,

quiescent mode

100

220

µA

Low power mode

CMRR

Common mode

rejection ration

Normal mode

-85

Low power mode

-90

PSRR

Power supply

rejection ratio

Normal mode

--85

Low power mode

-90

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