STM32F407IGH6 datasheet(137/185 Pages) STMICROELECTRONICS

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STM32F405xx, STM32F407xx

Electrical characteristics

Figure 54. 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.

5.3.25

FSMC characteristics

Unless otherwise specified, the parameters given in Table 75 to Table 86 for the FSMC

interface are derived from tests performed under the ambient temperature, fHCLK frequency

and VDD supply voltage conditions summarized in Table 14, with the following configuration:

•

Output speed is set to OSPEEDRy[1:0] = 10

•

Capacitive load C = 30 pF

•

Measurement points are done at CMOS levels: 0.5VDD

Refer to Section Section 5.3.16: I/O port characteristics for more details on the input/output

characteristics.

Update

rate(2)

Max frequency for a correct

DAC_OUT change when

small variation in the input

code (from code i to i+1LSB)

MS/s

CLOAD ≤ 50 pF,

RLOAD ≥ 5 kΩ

tWAKEUP(4)

Wakeup time from off state

(Setting the ENx bit in the

DAC Control register)

6.5

µs

CLOAD ≤ 50 pF, RLOAD ≥ 5 kΩ

input code between lowest and

highest possible ones.

PSRR+ (2)

Power supply rejection ratio

(to VDDA) (static DC

measurement)

–67

–40

No RLOAD, CLOAD = 50 pF

1. VDD/VDDA minimum value of 1.7 V is obtained when the device operates in reduced temperature range, and with the use of

an external power supply supervisor (refer to Section : Internal reset OFF).

2. Guaranteed by design, not tested in production.

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, not tested in production.

Table 74. DAC characteristics (continued)

Symbol

Parameter

Min

Typ

Max

Unit

Comments

R LOAD

C LOAD

Buffered/Non-buffered DAC

DACx_OUT

Buffer(1)

12-bit

digital to

analog

converter

ai17157

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