STM32H723VG datasheet(173/227 Pages) STMICROELECTRONICS

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DS13313 Rev 2

173/227

STM32H723xE/G

Electrical characteristics

208

Figure 41. 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.

THD

Total harmonic

distortion(6)

DAC output buffer ON, CL ≤ 50 pF,

RL ≥ 5 ㏀ , 1 kHz

−78.6

DAC output buffer OFF,

CL ≤ 50 pF, no RL, 1 kHz

−78.6

SINAD

Signal-to-noise and

distortion ratio(6)

DAC output buffer ON, CL ≤ 50 pF,

RL ≥ 5 ㏀ , 1 kHz

67.5

DAC output buffer OFF,

CL ≤ 50 pF, no RL, 1 kHz

67.5

ENOB

Effective number of

bits

DAC output buffer ON,

CL ≤ 50 pF, RL ≥ 5 ㏀ , 1 kHz

10.9

bits

DAC output buffer OFF,

CL ≤ 50 pF, no RL, 1 kHz

10.9

1. Guaranteed by characterization results.

2. Difference between two consecutive codes minus 1 LSB.

3. Difference between the value measured 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 86. DAC accuracy(1) (continued)

Symbol

Parameter

Conditions

Min

Typ

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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