STM32L15XCC datasheet(105/136 Pages) STMICROELECTRONICS

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STM32L151xC STM32L152xC

Electrical characteristics

109

Figure 31. 12-bit buffered /non-buffered DAC

1. 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.

6.3.19

Operational amplifier characteristics

4. Difference between measured value at Code i and the value at Code i on a line drawn between Code 0 and last Code 4095.

5. Difference between the value measured at Code (0x800) and the ideal value = VREF+/2.

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

7. 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.

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

Table 60. 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

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