STM32MP151AAB3 datasheet(199/245 Pages) STMICROELECTRONICS

199 / 245 page

DS12500 Rev 1

199/245

STM32MP151A

Electrical characteristics

228

Figure 39. 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.

SINAD

Signal-to-

noise and

distortion

ratio(6)

DAC output buffer ON,

CL ≤ 50 pF, RL ≥ 5 kΩ,

1 kHz

67.5

ENOB

Effective

number of

bits

DAC output buffer ON,

CL ≤ 50 pF, RL ≥ 5 kΩ,

1 kHz

10.9

bits

1. Guaranteed by characterization.

2. Difference between two consecutive codes minus 1 LSB.

3. Difference between measured the value at Code i and the value measured at Code i on a line drawn between Code 0 and

last Code 4095.

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

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

when the buffer is OFF, and from code giving 0.2 V and (VREF+ - 0.2 V) when the buffer is ON.

6. Signal is -0.5dBFS with Fsampling=1 MHz.

Table 76. DAC accuracy (continued)

Symbol

Parameter

Conditions

Min

Typ(1)

Max

Unit

R L

C L

Buffered/Non-buffered DAC

DAC_OUTx

Buffer(1)

12-bit

digital to

analog

converter

ai17157V3

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