Datasheet

Electrical characteristics STM32F37xxx
102/131 DocID022691 Rev 4
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.
Offset
(3)
Offset error
(difference between
measured value at Code
(0x800) and the ideal value
= V
REF+
/2)
-- ±10mV
-- ±3LSB
Given for the DAC in 10-bit at V
REF+
= 3.6 V
-- ±12LSB
Given for the DAC in 12-bit at V
REF+
= 3.6 V
Gain
error
(3)
Gain error - - ±0.5 %
Given for the DAC in 12bit
configuration
t
SETTLING
(
3)
Settling time (full scale: for
a 10-bit input code
transition between the
lowest and the highest input
codes when DAC_OUT
reaches final value ±1LSB
-3 4 µsC
LOAD
≤ 50 pF, R
LOAD
≥ 5 kΩ
Update
rate
(3)
Max frequency for a correct
DAC_OUT change when
small variation in the input
code (from code i to
i+1LSB)
-- 1
MS/
s
C
LOAD
≤ 50 pF, R
LOAD
≥ 5 kΩ
t
WAKEUP
(3)
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+
(1)
Power supply rejection ratio
(to V
DDA
) (static DC
measurement
--67 -40 dBNo R
LOAD
, C
LOAD
= 50 pF
1. Guaranteed by design, not tested in production.
2. Quiescent mode refers to the state of the DAC keeping a steady value on the output, so no dynamic consumption is
involved.
3. Guaranteed by characterization, not tested in production.
Table 63. DAC characteristics (continued)
Symbol Parameter Min Typ Max Unit Comments
R
LOAD
C
LOAD
DACx_OUT
Buffer(1)
12-bit
digital to
analog
converter
ai17157