Datasheet

Electrical characteristics STM32F765xx STM32F767xx STM32F768Ax STM32F769xx
174/255 DocID029041 Rev 6
Figure 46. 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.
5.3.29 Communications interfaces
I
2
C interface characteristics
The I
2
C interface meets the timings requirements of the I
2
C-bus specification and user
manual rev. 03 for:
• Standard-mode (Sm): with a bit rate up to 100 kbit/s
• Fast-mode (Fm): with a bit rate up to 400 kbit/s.
• Fast-mode Plus (Fm+): with a bit rate up to 1Mbit/s.
The I
2
C timings requirements are guaranteed by design when the I2C peripheral is properly
configured (refer to RM0410 reference manual) and when the I2CCLK frequency is greater
than the minimum shown in the table below:
t
WAKEUP
(4)
Wakeup time from off state
(Setting the ENx bit in the
DAC Control register)
- 6.5 10 µs
C
LOAD
≤ 50 pF, R
LOAD
≥ 5 kΩ
input code between lowest and highest
possible ones.
PSRR+
(2)
Power supply rejection ratio
(to V
DDA
) (static DC
measurement)
- –67 –40 dB No R
LOAD
, C
LOAD
= 50 pF
1. V
DDA
minimum value of 1.7 V is obtained with the use of an external power supply supervisor (refer to Section 2.18.2:
Internal reset OFF).
2. Guaranteed by design.
3. The quiescent mode corresponds to a state where the DAC maintains a stable output level to ensure that no dynamic
consumption occurs.
4. Guaranteed by characterization results.
Table 83. DAC characteristics (continued)
Symbol Parameter Min Typ Max Unit Comments
5
/
&
/
%XIIHUHG1RQEXIIHUHG'$&
'$&B287[
%XIIHU
ELW
GLJLWDOWR
DQDORJ
FRQYHUWHU
AI6
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