Datasheet

DocID030538 Rev 3 165/226
STM32H743xI Electrical characteristics
196
Figure 42. 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.
OffsetCal
Offset error at code
0x800 after factory
calibration
DAC output
buffer ON,
C
L
≤ 50 pF,
R
L
≥ 5 ㏀
V
REF+
= 3.6 V - - ±5
LSB
V
REF+
= 1.8 V - - ±7
Gain Gain error
(5)
DAC output buffer ON,C
L
≤ 50 pF,
R
L
≥ 5 ㏀
--±1
%
DAC output buffer OFF,
C
L
≤ 50 pF, no R
L
--±1
TUE Total unadjusted error
DAC output buffer OFF,
C
L
≤ 50 pF, no R
L
--±12LSB
SNR Signal-to-noise ratio
(6)
DAC output buffer ON,C
L
≤ 50 pF,
R
L
≥ 5 ㏀ , 1 kHz, BW = 500 KHz
- 67.8 - dB
SINAD
Signal-to-noise and
distortion ratio
(6)
DAC output buffer ON, C
L
≤ 50 pF,
R
L
≥ 5 ㏀ , 1 kHz
- 67.5 - dB
ENOB
Effective number of
bits
DAC output buffer ON,
C
L
≤ 50 pF, R
L
≥ 5 ㏀ , 1 kHz
- 10.9 - bits
1. Guaranteed by characterization.
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 (V
REF+
- 0.2 V) when the buffer is ON.
6. Signal is -0.5dBFS with F
sampling
=1 MHz.
Table 87. 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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